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Duramax flywheel housing seals

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.
<p>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.</p>

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.
<p>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.</p>

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