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That coolant filter housing in Laredo nearly cost me a $4,800 head job
Last Tuesday I pulled a semi into the shop with a slow weep from the housing and found the O-ring had gone flat because the previous guy torqued it to 85 ft-lbs instead of the 35 in the book, so can anyone tell me if they've seen these housings crack from overtightening before the coolant even gets hot?
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nancy4751mo ago
85 ft-lbs on a housing that calls for 35 in-lbs is about 30 times too much, so yeah, that aluminum is going to give somewhere. I've seen those housings crack right at the bolt flange before the motor ever warmed up, usually hairline cracks that only weep once things get hot and the metal grows. The flat O-ring is often the first sign, then the crack shows up later when you pull it apart. Pressure test it cold and hot before you call it done, because a crack you miss now will bite you down the road.
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