GM Genuine Parts 12578069 | Engine Harmonic Balancer

Part Number
12578069
Engine Harmonic Balancer ACDelco GM Original Equipment 12578069

Fits: 02-09 Chevrolet Trailblazer, 02-06 Chevrolet Trailblazer EXT, 02-09 GMC Envoy, 02-06 GMC Envoy XL, 02-04 Oldsmobile Bravada, 03-08 Isuzu Ascender, 04-07 Buick Rainier, 04-05 GMC Envoy XUV, 05-09 Saab 9-7x

Special Price $130.81 Regular Price $145.34
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Estimated Ship Date: 1 Business Day or Less



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  • 2002-2003 Chevrolet Trailblazer
    • INCLS 12578073 WASHER REQUIRES SEAL KIT 89017622
  • 2005-2009 Saab 9-7x
    • INCLS 12578073 WASHER HAS A STEP ON THE HUB FOR RETAINMENT OF FRICTION WASHER)(REQUIRES SEAL KIT 89017622
  • 2004-2008 Isuzu Ascender
    • INCLS 12578073 WASHER HAS A STEP ON THE HUB FOR RETAINMENT OF FRICTION WASHER)(REQUIRES SEAL KIT 89017622
  • 2004-2006 Chevrolet Trailblazer EXT
    • INCLS 12578073 WASHER HAS A STEP ON THE HUB FOR RETAINMENT OF FRICTION WASHER)(REQUIRES SEAL KIT 89017622
  • 2002-2003 GMC Envoy
    • INCLS 12578073 WASHER REQUIRES SEAL KIT 89017622
  • 2002-2003 Oldsmobile Bravada
    • INCLS 12578073 WASHER REQUIRES SEAL KIT 89017622
  • 2004-2007 Buick Rainier
    • INCLS 12578073 WASHER HAS A STEP ON THE HUB FOR RETAINMENT OF FRICTION WASHER)(REQUIRES SEAL KIT 89017622
  • 2004-2009 Chevrolet Trailblazer
    • INCLS 12578073 WASHER HAS A STEP ON THE HUB FOR RETAINMENT OF FRICTION WASHER)(REQUIRES SEAL KIT 89017622
  • 2004-2005 GMC Envoy XUV
    • INCLS 12578073 WASHER HAS A STEP ON THE HUB FOR RETAINMENT OF FRICTION WASHER)(REQUIRES SEAL KIT 89017622
  • 2004-2006 GMC Envoy XL
    • INCLS 12578073 WASHER HAS A STEP ON THE HUB FOR RETAINMENT OF FRICTION WASHER)(REQUIRES SEAL KIT 89017622
  • 2004-2009 GMC Envoy
    • INCLS 12578073 WASHER HAS A STEP ON THE HUB FOR RETAINMENT OF FRICTION WASHER)(REQUIRES SEAL KIT 89017622
  • 2002-2003 Chevrolet Trailblazer EXT
    • INCLS 12578073 WASHER REQUIRES SEAL KIT 89017622
  • 2004-2004 Oldsmobile Bravada
    • INCLS 12578073 WASHER HAS A STEP ON THE HUB FOR RETAINMENT OF FRICTION WASHER)(REQUIRES SEAL KIT 89017622
  • 2003-2003 Isuzu Ascender
    • INCLS 12578073 WASHER REQUIRES SEAL KIT 89017622
  • 2002-2003 GMC Envoy XL
    • INCLS 12578073 WASHER REQUIRES SEAL KIT 89017622
Customer Questions
Will an engine flush clean my pistons?
No, an engine flush is unlikely to clean the pistons.
How to replace engine pistons?
Replacing engine pistons involves removing the engine from the vehicle, disassembling it, removing the pistons, inspecting the engine components, installing the new pistons, reassembling the engine, and testing it. It's a complex process that should only be attempted by experienced mechanics.
When do engine pistons rings go bad?
Engine piston rings can go bad due to wear and tear, inadequate lubrication, overheating, manufacturing defects, or improper installation. Symptoms of failing piston rings include reduced engine power, increased oil consumption, and blue smoke from the exhaust. Regular maintenance and inspection can help identify potential issues.
Why do engine piston rings fail?
Engine piston rings can fail due to wear and tear, inadequate lubrication, overheating, manufacturing defects, or improper installation. Regular maintenance and inspection of the engine can help identify potential issues. Symptoms of failing piston rings include reduced engine power, increased oil consumption, and blue smoke from the exhaust.
Can you replace engine pistons rings without removing the engine?
Replacing engine piston rings without removing the engine is possible but not recommended due to the extensive disassembly required and the risk of damaging other engine components. A full rebuild or overhaul is generally more efficient and effective.
Does AC Delco make Ford parts?
No, AC Delco produces parts primarily for General Motors vehicles and does not make parts specifically for Ford vehicles.
Can I use AC Delco parts to replace OEM parts?
Yes, in most cases AC Delco parts can be used as a replacement for OEM parts. However, it's important to ensure that the parts are compatible with your specific make and model of vehicle.
What AC Delco oil filter do I need?
AC Delco offers a variety of oil filters that are compatible with different makes and models of vehicles. To determine which AC Delco oil filter you need, consult your vehicle's owner's manual or use our online filter lookup tool that matches the make, model, and year of your vehicle.
Are oil pump gears necessary?
Yes, oil pump gears are essential for maintaining proper engine lubrication in an internal combustion engine.
How do oil pumps work?
Oil pumps work by creating pressure to circulate engine oil throughout an internal combustion engine.
Where is the oil pump located?
The oil pump is typically located inside the engine's lower oil pan or sump.
Why do oil pump failures happen?
Oil pump failures can arise from wear, contamination, poor maintenance, and manufacturing defects, causing inadequate lubrication and potential engine damage.
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