Why Are Exhaust Manifold Bolts Breaking On Chevy Silverados
Camila Farah
Chevy truck forum silverado sierra gmc truck forums.
The exhaust manifold bolts on gm 4. I just purchased my 2003 2500 hd with the 6 0l. What causes an exhaust manifold stud bolt to break. He said the manifolds warp and break off the bolts.
My truck is a 2007 with 84000 miles with an exhaust leak caused by defective bolts. 0 v8 s are junk and defective. Average failure mileage is 178 000 miles. 2007 chevy silverado exhaust manifold bolts snapping.
I heard the exhaust leak before i purchased it but the truck was immaculate and i couldnt pass it up since i enjoy doing my own maintenance. Wades shows you a little known trick to help loosen up some of those old seized and corroded exha. This expansion happens naturally and at first the manifold and mounting studs are in a state of elastic deformation. I dont know really why they break on the ls engines its all of them from the 4 8 to the 6 0 for what ever reason the head breaks off the bolt over time and the bolts are locktited in from the factory and from what i read a bear to get out i looked at mine closer and both the passenger and driver side rear most bolts are broke and has exhaust leak im guessing im going to have no choice but to.
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He has about 77 000 miles on the truck. Learn how to remove stuck exhaust manifold bolts or studs. Bolts tend to start dropping their strength around 750 f so. The 2007 chevrolet silverado has 1 problems reported for exhaust manifold bolts broken.
Bolts are not covered under gm powertrain warranty. In fact the day i was there he told me what the price of a new manifold was by looking at a repair order that was sitting on the counter.
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