Duramax Diesels Forum Truck of the Week
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Old 12-17-2017, 01:14 PM
valleyduramax valleyduramax is offline
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Default Lower valve covers

Just wondering what if any tricks or tips there are to removing the lower half of the valve covers. I am tearing top end of motor apart and am now at a standstill as the lower covers on both sides are stuck on. All bolts are removed and can't see anything holding them from coming off. Now with that, 7 out of the 8 injector hold down bolts twisted off when removing them. All I can assume is that the bolts are bound up against the bores and not allowing cover to pop off. I am at the point where I may just cut the covers up to remove as they are slowing progress to a standstill. Any other ideas?

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Old 12-17-2017, 01:19 PM
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gmduramax gmduramax is offline
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Did you take out the bolts that are next to the injectors?
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Old 12-17-2017, 01:26 PM
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PureHybrid PureHybrid is offline
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Yes the bolts will corrode to the lower cover. Best bet is to soak them in penetrating spray, I personally like a little heat and bee's wax.

Could also try drilling them a bit, but make sure to leave enough to get a bolt extractor on there once the lower cover is off.
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Old 12-17-2017, 01:32 PM
valleyduramax valleyduramax is offline
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Ya all the bolts are out and the cover will flex up a bit. I'll have to put some more penetrating oil and heat them up some. Last resort is a small hole saw to cut the section around each of the 8 bolts. I have another set of covers anyway if I need to remove this set in pieces. At that point of frustration


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Suncoast GMAX5, Precision ML built by me
Black CAT stacks built by me
Intake built by me
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Traction bars built by me
CAT Dual filter/Aeromotive 1000 setup built by me
Stock VVT turbo with Batmowheel, ported turbine
Relocated FICM
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Old 12-17-2017, 02:14 PM
bmc1025 bmc1025 is offline
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Even with just one bolt broke off they are a pain. Other than heat, lube and persistence I don't have any suggestions.
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