2003 Orion Bus Orion VII C8.3G 8.3 Cummins Remanufactured Long Block Engine
CNG • Dyno Tested • Warranty Included

About This Cummins C8.3G Remanufactured Long Block
Looking for a quality remanufactured long block engine for your 2003 Orion Bus Orion VII? US Engine Production offers premium remanufactured Cummins C8.3G long block engines that meet or exceed OEM specifications. Our remanufactured long blocks are completely disassembled, cleaned, inspected, and rebuilt using new components where necessary.
Every remanufactured cng long block undergoes rigorous dynamometer testing to ensure optimal performance. With over 40 years of experience and a database of 473,000+ engines, we're America's trusted source for remanufactured long block engines.
Common Cummins C8.3G Problems We Address
Our remanufacturing process specifically addresses these known issues with Cummins C8.3G engines:
- EGR cooler failures leading to coolant leaks
- Turbocharger actuator issues causing reduced power
- Fuel injector problems resulting in rough idle
- Head gasket failures from overheating
- Crankshaft position sensor failures
- Oil dilution from regeneration cycles
Our technicians use updated components and improved techniques to prevent these common failures in your remanufactured engine.
Engine Specifications
What's Included With Your Remanufactured Long Block
Complete long block assembly with all new/remanufactured components
Core Components
- Remanufactured Engine Block
Cleaned, inspected, and machined to OEM specifications
- New Pistons & Rings
Premium quality pistons with new ring sets
- Reground Crankshaft
Precision ground to factory tolerances
- New Main Bearings
OEM-spec main bearings for proper clearance
- New Rod Bearings
Connecting rod bearings replaced
- New Camshaft
New or reground camshaft (where applicable)
Timing Components
- New Timing Chain/Belt
Complete timing set included
- New Timing Gears/Sprockets
All timing components replaced
- New Tensioners & Guides
Timing tensioners and guides included
Valvetrain
- New Lifters/Tappets
Hydraulic or solid lifters replaced
- Reconditioned Cylinder Head(s)
Heads resurfaced and pressure tested
- New Valve Seals
All valve stem seals replaced
Seals & Lubrication
- New Oil Pump
Oil pump replaced for proper lubrication
- New Gasket Set
Complete gasket set included
- New Front & Rear Seals
All main seals replaced
- New Freeze Plugs
Core plugs replaced
Frequently Asked Questions: 2003 Orion Bus Orion VII Cummins C8.3G Remanufactured Engine
A remanufactured Cummins C8.3G 8.3L engine typically costs 40-60% less than a brand new engine from the dealer, making it the most cost-effective option for your 2003 Orion Bus Orion VII. The exact price depends on the specific configuration, condition of your core return, and current availability. For an accurate, no-obligation quote on a Cummins C8.3G remanufactured long block for your 2003 Orion Bus Orion VII, call our engine specialists at (631) 991-7700 or request a quote online. We offer competitive pricing with free nationwide shipping.
What Our Customers Say
Trusted by thousands of customers nationwide
"Excellent quality engine at a great price. The team was very helpful in finding the right engine for my truck. Shipped fast and arrived in perfect condition."
"I've bought several engines from US Engine Production over the years. Always top quality and their customer service is the best in the business."
"Was worried about buying a remanufactured engine but these guys made it easy. Engine runs like new and the warranty gives me peace of mind."
Warranty & Quality Assurance
Core Return Required: A refundable core deposit is required. We provide a prepaid shipping label for your old engine core return.
Call us for the best price on this Cummins C8.3G remanufactured long block. Prices may vary based on configuration.
Email: [email protected]
Why US Engine Production?
- 40+ years of experience
- 473,000+ engines in database
- Nationwide shipping
- Expert technical support
- Quality guaranteed
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Other model years available for the Orion Bus Orion VII
2007 Orion Bus Orion VII
Cummins ISB 5.9L
2012 Orion Bus Orion VII
Cummins ISL-G 8.9L
2006 Orion Bus Orion VII
Cummins M11 10.8L
2005 Orion Bus Orion VII
Cummins ISB 5.9L
2003 Orion Bus Orion VII
Detroit Diesel Series 50 8.5L
2005 Orion Bus Orion VII
Cummins C8.3G 8.3L
2008 Orion Bus Orion VII
Cummins ISL-G 8.9L
2005 Orion Bus Orion VII
Detroit Diesel Series 50 8.5L
Vehicles with Cummins C8.3G Engine
This same engine is also available for these vehicles
2004 El Dorado Transmark RE
C8.3G 8.3L CNG
2001 Freightliner FL50
C8.3G 8.3L CNG
2002 El Dorado E-Z Rider
C8.3G 8.3L CNG
2005 Freightliner FL80
C8.3G 8.3L CNG
2005 El Dorado E-Z Rider II
C8.3G 8.3L CNG
2006 Freightliner Condor
C8.3G 8.3L CNG
2006 Autocar LLC. Xpeditor WX
C8.3G 8.3L CNG
2007 Autocar LLC. Xpeditor WXLL
C8.3G 8.3L CNG
More Orion Bus Engines
Browse other Orion Bus models with remanufactured engines
1999 Orion Bus Orion V
Cummins M11 10.8L
1998 Orion Bus Orion VI
Cummins L10 10L
2002 Orion Bus Orion V
Detroit Diesel Series 50 8.5L
2005 Orion Bus Orion VII
Cummins ISC 8.3 8.3L
2001 Orion Bus Orion V
Cummins M11 10.8L
1998 Orion Bus Orion II
Cummins 6BT5.9 5.9L
2003 Orion Bus Orion V
Detroit Diesel Series 50 8.5L
2007 Orion Bus Orion VII
Cummins ISM 10.8 10.8L
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1995 Peterbilt 375
Cummins L10 10L DIESEL
1996 Ford L9000
Cummins N14 14L DIESEL
2001 Volvo WG
Cummins M11 10.8L DIESEL
1994 Freightliner FLD120
Cummins L10 10L DIESEL
2008 Dodge Ram 3500
Cummins 6.7L DIESEL
2003 International 5500i
Cummins ISM 10.8 10.8L DIESEL
2002 Freightliner Columbia
Cummins N14 14L DIESEL
Similar 8.3L CNG Engines
Other cng engines with similar specifications
2001 New Flyer C40
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2002 El Dorado Transmark RE
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2001 El Dorado E-Z Rider
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2005 Freightliner Condor
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2005 New Flyer C40LF
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2008 Autocar LLC. Xpeditor WXLL
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Buy Cummins C8.3G Remanufactured Long Block Engines
US Engine Production is your trusted source for remanufactured Cummins long block engines. Our C8.3G remanufactured long blocks for Orion Bus vehicles include all new internal components including pistons, rings, bearings, timing components, and gaskets. Every long block is dyno tested and backed by our 1-year, unlimited mileage warranty. Whether you need a replacement long block engine for your 2003 Orion Bus Orion VIIor any other application, our team of experts is ready to help. Call us at (631) 991-7700 or email [email protected] for a free quote today.
