Engine rebuild question
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Mountain Pass
Joined: Dec 2021
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Engine rebuild question
Alright folks, looking for opinions. I have an 89 351w just back from the shop. Started putting together last week. Installed the crank and torqued the main caps in sequence to 100 ft/lb. Here’s the question….. the bolts were dry. Should I pull it back apart and oil the threads and retorque? Pistons are in, heads are bolted on with ARP bolts and used the arp lube on the head bolts. Thanks for sharing your thoughts. Just keep reading that the main bolts should have had a drop of oil on them before installing…..
Cargo Master
Joined: Nov 2009
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You know, I'd have to look at some sort of actual specification, but I've always used motor oil on the threads of my Rod and Main bolts, when installing them. I don't know if it's something that's required, or just something I do because that's the way my Dad taught me to do it.
Cargo Master
Joined: Mar 2010
Posts: 3,339
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From: Laramie, WY
Oiled vs dry threads will impact the clamping force for a given torque applied, due to the frictional losses in the threads. Dry-dry will deliver less clamping force (more torque goes to friction) than oiled. That's why I was asking how dry they were. I think I'd pop the bolts out, oil, and reassemble too. The piece of mind would be worthwhile.
Hotshot
Joined: Nov 2017
Posts: 17,496
Likes: 2,773
From: Northern Ontario
You know, I'd have to look at some sort of actual specification, but I've always used motor oil on the threads of my Rod and Main bolts, when installing them. I don't know if it's something that's required, or just something I do because that's the way my Dad taught me to do it.
What would concern me is that you did not achieve the proper clamping load. Especially on main bearings. Ie. The hardware may be at torque, but not clamping down as they should be if done with lubrication.
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Mountain Pass
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I'm doing some heads, and was concerned about my bolts. If your pulling your end cap bolts, and they are used, you may want to check this video out:
Basically, using simple callipers, you can tell if you bolts are bad or good and will know if you need to replace or not:
Basically, using simple callipers, you can tell if you bolts are bad or good and will know if you need to replace or not:
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