Duramax flywheel housing seals

Oct. 15, 2012
Some GM vehicles equipped with the 6.6L Duramax diesel engine were involved in a mid-year change. Some of the vehicles may have been built with a flywheel housing that uses two different style seals (left and right). This applies to 2010–2012 Chevy Express, 2011-2012 Chevy Silverado 2500HD/3500 Series, 2010-2012 GMC Savana and 2011-2012 GMC Sierra 2500HD/3500.

Some GM vehicles equipped with the 6.6L Duramax diesel engine were involved in a mid-year change. Some of the vehicles may have been built with a flywheel housing that uses two different style seals (left and right). This applies to 2010–2012 Chevy Express, 2011-2012 Chevy Silverado 2500HD/3500 Series, 2010-2012 GMC Savana and 2011-2012 GMC Sierra 2500HD/3500.

On affected vehicles that require seal replacement (if coolant is leaking out of the rear cover), the left (driver side) turbo tube seal is an orange O-ring (P/N 94056175) and the right seal is a blue/green press-in-place seal, P/N 12627895.

The machining of the flywheel housing for each style of seal is different and not cross-compatible. If the flywheel housing is removed for service, replace these seals.

Sponsored Recommendations

Remote Expert: Access OEM Services On Your Autel Tablet

Carrying active OEM subscriptions for all manufacturers is not possible for many shops. However, access to this software is required for certain modern vehicles and repairs, and...

How to Properly Lubricate your Air Tools

Learn how to properly lubricate your AIRCAT air tools to keep them running at peak performance. Discover essential daily maintenance and storage techniques, along with the right...

Save Time with Standard's Kits & Multipacks

Stock up on essential repair kits! Discover how Standard's multipacks simplify repairs and reduce downtime.

Fuel Injection Training – Pro Tips for Techs

Choosing the right fuel injector matters. Learn best practices for selection and related component recommendations.

Voice Your Opinion!

To join the conversation, and become an exclusive member of Vehicle Service Pros, create an account today!