1990 Thomas School Bus Engine Parts
Find Your Specific 1990 Thomas School Bus Engine Parts
Below you will find various in-demand Thomas Engine Parts, components and accessories for your 1990 School Bus. Advance Auto Parts has popular School Bus parts like Remanufactured Engines Oil Pumps and more. You’ll also find aftermarket and OEM Engine Parts for other School Bus model years including
1989,
1991,
2000,
2006 and more. Select a category of 1990 Thomas School Bus Engine Parts below and start saving instantly.
Popular 1990 Thomas School Bus Engine Parts Categories
Essential Engine Parts for 1990 Thomas School Buses
Melling – Stock Replacement OE Type Oil Pump (Part No.M350)
from
$292.99
Made in USA. Melling oil pumps provide dependable performance every time in every application. Every Melling oil pump is engineered and assembled to the highest production standards from high quality materials. All Melling oil pumps use the latest in gear and gerotor technology to provide the highest level of quality and performance. Gears are machined to close tolerances to ensure proper engine pressure and correct, efficient pump operation. End plates are precision ground for maximum wear resistance. Every Melling oil pump is individually tested for pressure and flow under conditions designed to duplicate actual engine operating conditions.
Product Features:
See More
Product Features:
- Manufactured from high quality materials for consistent durable wear
- Precision engineered for optimum fit and function
- Designed for long-life and worry-free performance
- Melling oil pumps are tested for pressure and flow under operating conditions to ensure quality
Blackwater Engines – Long Block Engine 5.9L Cummins 12V 4th Style Stock Replacement (Part No.AAB59AD01)
from
$6890.00
All Blackwater Engines Long Blocks are balanced, blueprinted, and updated through reverse engineering. All cylinder blocks are torque plate honed. All long blocks are reassembled using high quality OE or ISO 9001 provider parts. Does not include oil pan, front cover, rear cover, or fuel injection system. Every assembly is tested on state-of-the-art test equipment to ensure compression, oil pressure, and coolant system integrity.
Product Features:
See More
Product Features:
- Call 1-877-421-4317 for customer service, availability, and technical support.
- Includes Long Block, Oil Pump, Gasket Set
- Stock Replacement No Upgrades
- Must replace oil cooler, injectors, and air compressor if equipped and connected to the engine oiling system or cooling system
- Prime the oil system fully before startup
- Prime the oil system fully before startup
Blackwater Engines – Long Block Engine 5.9L Cummins 12V 5th Style 1 Upgrade (Part No.AAB59AE02)
from
$7586.00
All Blackwater Engines Long Blocks are balanced, blueprinted, and updated through reverse engineering. All cylinder blocks are torque plate honed. All long blocks are reassembled using high quality OE or ISO 9001 provider parts. Does not include oil pan, front cover, rear cover, or fuel injection system. Every assembly is tested on state-of-the-art test equipment to ensure compression, oil pressure, and coolant system integrity.
Product Features:
See More
Product Features:
- Call 1-877-421-4317 for customer service, availability, and technical support.
- Includes Long Block, Oil Pump, Gasket Set
- ARP Head Studs
- Must replace oil cooler, injectors, and air compressor if equipped and connected to the engine oiling system or cooling system
- Prime the oil system fully before startup
- Prime the oil system fully before startup
Blackwater Engines – Long Block Engine 5.9L Cummins 12V 1st Style Stock Replacement (Part No.AAB59AA01)
from
$6890.00
All Blackwater Engines Long Blocks are balanced, blueprinted, and updated through reverse engineering. All cylinder blocks are torque plate honed. All long blocks are reassembled using high quality OE or ISO 9001 provider parts. Does not include oil pan, front cover, rear cover, or fuel injection system. Every assembly is tested on state-of-the-art test equipment to ensure compression, oil pressure, and coolant system integrity.
Product Features:
See More
Product Features:
- Call 1-877-421-4317 for customer service, availability, and technical support.
- Includes Long Block, Oil Pump, Gasket Set
- Stock Replacement No Upgrades
- Must replace oil cooler, injectors, and air compressor if equipped and connected to the engine oiling system or cooling system
- Prime the oil system fully before startup
- Prime the oil system fully before startup
Blackwater Engines – Long Block Engine 5.9L Cummins 12V 2nd Style 1 Upgrade (Part No.AAB59AB02)
from
$7586.00
All Blackwater Engines Long Blocks are balanced, blueprinted, and updated through reverse engineering. All cylinder blocks are torque plate honed. All long blocks are reassembled using high quality OE or ISO 9001 provider parts. Does not include oil pan, front cover, rear cover, or fuel injection system. Every assembly is tested on state-of-the-art test equipment to ensure compression, oil pressure, and coolant system integrity.
Product Features:
See More
Product Features:
- Call 1-877-421-4317 for customer service, availability, and technical support.
- Includes Long Block, Oil Pump, Gasket Set
- ARP Head Studs
- Must replace oil cooler, injectors, and air compressor if equipped and connected to the engine oiling system or cooling system
- Prime the oil system fully before startup
- Prime the oil system fully before startup
Blackwater Engines – Long Block Engine 5.9L Cummins 12V 1st Style 1 Upgrade (Part No.AAB59AA02)
from
$7586.00
All Blackwater Engines Long Blocks are balanced, blueprinted, and updated through reverse engineering. All cylinder blocks are torque plate honed. All long blocks are reassembled using high quality OE or ISO 9001 provider parts. Does not include oil pan, front cover, rear cover, or fuel injection system. Every assembly is tested on state-of-the-art test equipment to ensure compression, oil pressure, and coolant system integrity.
Product Features:
See More
Product Features:
- Call 1-877-421-4317 for customer service, availability, and technical support.
- Includes Long Block, Oil Pump, Gasket Set
- ARP Head Studs
- Must replace oil cooler, injectors, and air compressor if equipped and connected to the engine oiling system or cooling system
- Prime the oil system fully before startup
- Prime the oil system fully before startup
Blackwater Engines – Long Block Engine 5.9L Cummins 12V 3rd Style Stock Replacement (Part No.AAB59AC01)
from
$6890.00
All Blackwater Engines Long Blocks are balanced, blueprinted, and updated through reverse engineering. All cylinder blocks are torque plate honed. All long blocks are reassembled using high quality OE or ISO 9001 provider parts. Does not include oil pan, front cover, rear cover, or fuel injection system. Every assembly is tested on state-of-the-art test equipment to ensure compression, oil pressure, and coolant system integrity.
Product Features:
See More
Product Features:
- Call 1-877-421-4317 for customer service, availability, and technical support.
- Includes Long Block, Oil Pump, Gasket Set
- Stock Replacement No Upgrades
- Must replace oil cooler, injectors, and air compressor if equipped and connected to the engine oiling system or cooling system
- Prime the oil system fully before startup
- Prime the oil system fully before startup
Blackwater Engines – Long Block Engine 5.9L Cummins 12V 2nd Style Stock Replacement (Part No.AAB59AB01)
from
$6890.00
All Blackwater Engines Long Blocks are balanced, blueprinted, and updated through reverse engineering. All cylinder blocks are torque plate honed. All long blocks are reassembled using high quality OE or ISO 9001 provider parts. Does not include oil pan, front cover, rear cover, or fuel injection system. Every assembly is tested on state-of-the-art test equipment to ensure compression, oil pressure, and coolant system integrity.
Product Features:
See More
Product Features:
- Call 1-877-421-4317 for customer service, availability, and technical support.
- Includes Long Block, Oil Pump, Gasket Set
- Stock Replacement No Upgrades
- Must replace oil cooler, injectors, and air compressor if equipped and connected to the engine oiling system or cooling system
- Prime the oil system fully before startup
- Prime the oil system fully before startup
Blackwater Engines – Long Block Engine 7.2L Caterpillar 3126 3V 5th Style Stock Replacement (Part No.AAB72AE01)
from
$9490.00
All Blackwater Engines Long Blocks are balanced, blueprinted, and updated through reverse engineering. All cylinder blocks are torque plate honed. All long blocks are reassembled using high quality OE or ISO 9001 provider parts. Does not include oil pan, front cover, rear cover, or fuel injection system. Every assembly is tested on state-of-the-art test equipment to ensure compression, oil pressure, and coolant system integrity.
Product Features:
See More
Product Features:
- Call 1-877-421-4317 for customer service, availability, and technical support.
- Includes Long Block, Oil Pump, Gasket Set
- Stock Replacement No Upgrades
- Must replace oil cooler, injectors, and air compressor if equipped and connected to the engine oiling system or cooling system
- Prime the oil system fully before startup
- Prime the oil system fully before startup
Blackwater Engines – Long Block Engine 7.2L Caterpillar 3126 3V 2nd Style Stock Replacement (Part No.AAB72AB01)
from
$9490.00
All Blackwater Engines Long Blocks are balanced, blueprinted, and updated through reverse engineering. All cylinder blocks are torque plate honed. All long blocks are reassembled using high quality OE or ISO 9001 provider parts. Does not include oil pan, front cover, rear cover, or fuel injection system. Every assembly is tested on state-of-the-art test equipment to ensure compression, oil pressure, and coolant system integrity.
Product Features:
See More
Product Features:
- Call 1-877-421-4317 for customer service, availability, and technical support.
- Includes Long Block, Oil Pump, Gasket Set
- Stock Replacement No Upgrades
- Must replace oil cooler, injectors, and air compressor if equipped and connected to the engine oiling system or cooling system
- Prime the oil system fully before startup
- Prime the oil system fully before startup
Blackwater Engines – Long Block Engine 7.2L Caterpillar 3126 3V 4th Style Stock Replacement (Part No.AAB72AD01)
from
$9490.00
All Blackwater Engines Long Blocks are balanced, blueprinted, and updated through reverse engineering. All cylinder blocks are torque plate honed. All long blocks are reassembled using high quality OE or ISO 9001 provider parts. Does not include oil pan, front cover, rear cover, or fuel injection system. Every assembly is tested on state-of-the-art test equipment to ensure compression, oil pressure, and coolant system integrity.
Product Features:
See More
Product Features:
- Call 1-877-421-4317 for customer service, availability, and technical support.
- Includes Long Block, Oil Pump, Gasket Set
- Stock Replacement No Upgrades
- Must replace oil cooler, injectors, and air compressor if equipped and connected to the engine oiling system or cooling system
- Prime the oil system fully before startup
- Prime the oil system fully before startup
Blackwater Engines – Long Block Engine 7.2L Caterpillar 3126 3V 3rd Style Stock Replacement (Part No.AAB72AC01)
from
$9490.00
All Blackwater Engines Long Blocks are balanced, blueprinted, and updated through reverse engineering. All cylinder blocks are torque plate honed. All long blocks are reassembled using high quality OE or ISO 9001 provider parts. Does not include oil pan, front cover, rear cover, or fuel injection system. Every assembly is tested on state-of-the-art test equipment to ensure compression, oil pressure, and coolant system integrity.
Product Features:
See More
Product Features:
- Call 1-877-421-4317 for customer service, availability, and technical support.
- Includes Long Block, Oil Pump, Gasket Set
- Stock Replacement No Upgrades
- Must replace oil cooler, injectors, and air compressor if equipped and connected to the engine oiling system or cooling system
- Prime the oil system fully before startup
- Prime the oil system fully before startup
Upgrade your 1990 Thomas School Bus with Top-Quality Engine Parts
When it comes to maintaining or upgrading your 1990 Thomas School Bus, nothing is more important than using high-quality OEM or aftermarket parts that you can trust. Whether you’re repairing damage to your Thomas or enhancing its overall performance, Engine Parts are key to keeping your School Bus functioning at its best. At Advance Auto Parts, we offer a wide selection of 8 Engine Parts for the 1990 Thomas School Bus, designed to meet your needs without breaking the bank.
From
Remanufactured Engine
replacements to
Oil Pumps
upgrades, we’ve got you covered with parts that fit your vehicle perfectly and ensure long-lasting performance.
Affordable Prices and Wide Selection
Shopping for Engine Parts for any vehicle can be a hassle, especially if you’re on a budget. But with Advance Auto Parts, you can find high-quality Engine Parts for your 1990 Thomas School Bus at great prices.
Our Engine Parts inventory for this model
ranges from just $292.99 to $7,586.00, with
an average price of $6,326.37.
Our 8 Engine Parts in stock come from 2 trusted brands, so you’re sure to find the right part for your 1990 Thomas School Bus without overspending.
Explore Related Parts and More
While you’re here, don’t forget to check out other essential categories that go hand in hand with Engine Part upgrades. Explore related part types like Fluids and Chemicals, Wipers and Related Products
and more to make sure your 1990 Thomas School Bus is always ready to roll. We’re committed to providing you with everything you need to keep your School Bus in top shape, all in one place.
Start shopping confidently below for your 1990 Thomas School Bus!
Best-Selling Remanufactured Engines for 1990 Thomas School Buses
Enhance the driving experience in your Thomas with 7 quality Remanufactured Engine components, starting at $6,890.00.
Blackwater Engines – Long Block Engine 5.9L Cummins 12V 2nd Style 1 Upgrade (Part No.AAB59AB02)
from
$7586.00
All Blackwater Engines Long Blocks are balanced, blueprinted, and updated through reverse engineering. All cylinder blocks are torque plate honed. All long blocks are reassembled using high quality OE or ISO 9001 provider parts. Does not include oil pan, front cover, rear cover, or fuel injection system. Every assembly is tested on state-of-the-art test equipment to ensure compression, oil pressure, and coolant system integrity.
Product Features:
See More
Product Features:
- Call 1-877-421-4317 for customer service, availability, and technical support.
- Includes Long Block, Oil Pump, Gasket Set
- ARP Head Studs
- Must replace oil cooler, injectors, and air compressor if equipped and connected to the engine oiling system or cooling system
- Prime the oil system fully before startup
- Prime the oil system fully before startup
Blackwater Engines – Long Block Engine 5.9L Cummins 12V 5th Style 1 Upgrade (Part No.AAB59AE02)
from
$7586.00
All Blackwater Engines Long Blocks are balanced, blueprinted, and updated through reverse engineering. All cylinder blocks are torque plate honed. All long blocks are reassembled using high quality OE or ISO 9001 provider parts. Does not include oil pan, front cover, rear cover, or fuel injection system. Every assembly is tested on state-of-the-art test equipment to ensure compression, oil pressure, and coolant system integrity.
Product Features:
See More
Product Features:
- Call 1-877-421-4317 for customer service, availability, and technical support.
- Includes Long Block, Oil Pump, Gasket Set
- ARP Head Studs
- Must replace oil cooler, injectors, and air compressor if equipped and connected to the engine oiling system or cooling system
- Prime the oil system fully before startup
- Prime the oil system fully before startup
Blackwater Engines – Long Block Engine 5.9L Cummins 12V 1st Style 1 Upgrade (Part No.AAB59AA02)
from
$7586.00
All Blackwater Engines Long Blocks are balanced, blueprinted, and updated through reverse engineering. All cylinder blocks are torque plate honed. All long blocks are reassembled using high quality OE or ISO 9001 provider parts. Does not include oil pan, front cover, rear cover, or fuel injection system. Every assembly is tested on state-of-the-art test equipment to ensure compression, oil pressure, and coolant system integrity.
Product Features:
See More
Product Features:
- Call 1-877-421-4317 for customer service, availability, and technical support.
- Includes Long Block, Oil Pump, Gasket Set
- ARP Head Studs
- Must replace oil cooler, injectors, and air compressor if equipped and connected to the engine oiling system or cooling system
- Prime the oil system fully before startup
- Prime the oil system fully before startup
Blackwater Engines – Long Block Engine 5.9L Cummins 12V 3rd Style Stock Replacement (Part No.AAB59AC01)
from
$6890.00
All Blackwater Engines Long Blocks are balanced, blueprinted, and updated through reverse engineering. All cylinder blocks are torque plate honed. All long blocks are reassembled using high quality OE or ISO 9001 provider parts. Does not include oil pan, front cover, rear cover, or fuel injection system. Every assembly is tested on state-of-the-art test equipment to ensure compression, oil pressure, and coolant system integrity.
Product Features:
See More
Product Features:
- Call 1-877-421-4317 for customer service, availability, and technical support.
- Includes Long Block, Oil Pump, Gasket Set
- Stock Replacement No Upgrades
- Must replace oil cooler, injectors, and air compressor if equipped and connected to the engine oiling system or cooling system
- Prime the oil system fully before startup
- Prime the oil system fully before startup
Blackwater Engines – Long Block Engine 5.9L Cummins 12V 4th Style Stock Replacement (Part No.AAB59AD01)
from
$6890.00
All Blackwater Engines Long Blocks are balanced, blueprinted, and updated through reverse engineering. All cylinder blocks are torque plate honed. All long blocks are reassembled using high quality OE or ISO 9001 provider parts. Does not include oil pan, front cover, rear cover, or fuel injection system. Every assembly is tested on state-of-the-art test equipment to ensure compression, oil pressure, and coolant system integrity.
Product Features:
See More
Product Features:
- Call 1-877-421-4317 for customer service, availability, and technical support.
- Includes Long Block, Oil Pump, Gasket Set
- Stock Replacement No Upgrades
- Must replace oil cooler, injectors, and air compressor if equipped and connected to the engine oiling system or cooling system
- Prime the oil system fully before startup
- Prime the oil system fully before startup
Blackwater Engines – Long Block Engine 5.9L Cummins 12V 2nd Style Stock Replacement (Part No.AAB59AB01)
from
$6890.00
All Blackwater Engines Long Blocks are balanced, blueprinted, and updated through reverse engineering. All cylinder blocks are torque plate honed. All long blocks are reassembled using high quality OE or ISO 9001 provider parts. Does not include oil pan, front cover, rear cover, or fuel injection system. Every assembly is tested on state-of-the-art test equipment to ensure compression, oil pressure, and coolant system integrity.
Product Features:
See More
Product Features:
- Call 1-877-421-4317 for customer service, availability, and technical support.
- Includes Long Block, Oil Pump, Gasket Set
- Stock Replacement No Upgrades
- Must replace oil cooler, injectors, and air compressor if equipped and connected to the engine oiling system or cooling system
- Prime the oil system fully before startup
- Prime the oil system fully before startup
Blackwater Engines – Long Block Engine 5.9L Cummins 12V 1st Style Stock Replacement (Part No.AAB59AA01)
from
$6890.00
All Blackwater Engines Long Blocks are balanced, blueprinted, and updated through reverse engineering. All cylinder blocks are torque plate honed. All long blocks are reassembled using high quality OE or ISO 9001 provider parts. Does not include oil pan, front cover, rear cover, or fuel injection system. Every assembly is tested on state-of-the-art test equipment to ensure compression, oil pressure, and coolant system integrity.
Product Features:
See More
Product Features:
- Call 1-877-421-4317 for customer service, availability, and technical support.
- Includes Long Block, Oil Pump, Gasket Set
- Stock Replacement No Upgrades
- Must replace oil cooler, injectors, and air compressor if equipped and connected to the engine oiling system or cooling system
- Prime the oil system fully before startup
- Prime the oil system fully before startup
Most Popular 1990 Thomas School Bus Oil Pumps
Customize your Thomas with 1 Oil Pumps products
like Oil Pumps, all
priced under $292.99.
Melling – Stock Replacement OE Type Oil Pump (Part No.M350)
from
$292.99
Made in USA. Melling oil pumps provide dependable performance every time in every application. Every Melling oil pump is engineered and assembled to the highest production standards from high quality materials. All Melling oil pumps use the latest in gear and gerotor technology to provide the highest level of quality and performance. Gears are machined to close tolerances to ensure proper engine pressure and correct, efficient pump operation. End plates are precision ground for maximum wear resistance. Every Melling oil pump is individually tested for pressure and flow under conditions designed to duplicate actual engine operating conditions.
Product Features:
See More
Product Features:
- Manufactured from high quality materials for consistent durable wear
- Precision engineered for optimum fit and function
- Designed for long-life and worry-free performance
- Melling oil pumps are tested for pressure and flow under operating conditions to ensure quality
FAQs for 1990 Thomas School Bus Engine Parts
Which Engine Parts are best-sellers for 1990 Thomas School Buses?
Out of 8 Engine Parts that fit 1990 Thomas School Buses, the following parts are the top sellers:
- Long Block Engine 5.9L Cummins 12V 1st Style Stock Replacement (50340385) – $6,890.00
- Long Block Engine 5.9L Cummins 12V 3rd Style Stock Replacement (50340401) – $6,890.00
- Long Block Engine 5.9L Cummins 12V 2nd Style Stock Replacement (50340391) – $6,890.00
What’s the price range for 1990 Thomas School Bus Engine Parts?
Engine Part prices for the 1990 Thomas School Bus start at $292.99 and go up to $7,586.00 for the most premium parts.
What’s the average price of a Engine Part for a 1990 Thomas School Bus?
The average price for Engine Parts for the 1990 Thomas School Bus is $6,326.37. Keep in mind the variety of part types within our Engine Part category so you are likely to find a wide range of prices across a variety of parts and components.
Does Advance Auto Parts sell Engine Parts for other Thomas School Bus model years?
What are the cheapest Engine Parts for my 1990 Thomas School Bus?
The cheapest 1990 Thomas School Bus Engine Parts we carry in stock are:
- Stock Replacement OE Type Oil Pump (21298971) – $292.99
- Long Block Engine 5.9L Cummins 12V 3rd Style Stock Replacement (50340401) – $6,890.00
- Long Block Engine 5.9L Cummins 12V 4th Style Stock Replacement (50340344) – $6,890.00
- Long Block Engine 5.9L Cummins 12V 2nd Style Stock Replacement (50340391) – $6,890.00
- Long Block Engine 5.9L Cummins 12V 1st Style Stock Replacement (50340385) – $6,890.00
What types of Engine Parts do you sell for my 1990 Thomas School Bus?
As of 6/2/26, these are some of the most in-demand types of Engine Parts for a 1990 Thomas School Bus:
Can I get help with 1990 Thomas School Bus Engine Part orders?
Contact our customer support team, by chat or phone, through the help desk page, where you can find instant answers about Thomas Engine Parts and more.
What is your return policy for Thomas School Bus Engine Parts?
Advance Auto Parts keeps returns simple. For new Thomas School Bus Engine Parts and accessories, your online orders can be returned, in their original condition, within 45 days. For requirements, see the returns page.
