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.

The Duramax flywheel housing features two different seals: a press-in-place blue/green seal for the right side (1) and an orange turbo tube O-ring seal (2) for the left side.

The Duramax flywheel housing features two different seals: a press-in-place blue/green seal for the right side (1) and an orange turbo tube O-ring seal (2) for the left side.

Whenever the flywheel housing is removed for service, replace these two seals. Pay attention to the machined seal grooves, since they differ for each seal style.

Whenever the flywheel housing is removed for service, replace these two seals. Pay attention to the machined seal grooves, since they differ for each seal style.


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