'89 YJ Motor Mount Bracket Bolts - JeepForum.com
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post #1 of 9 Old 07-20-2021, 06:00 PM Thread Starter
jimsahm
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'89 YJ Motor Mount Bracket Bolts

Question: I re-installed and torqued to FSM value the engine bracket bolts (ones that hold brackets to the block). I read elsewhere to get new hardware and to not reuse the bolts. Any opinion if I should replace bolts or roll with it? Just re-installed engine (rebuilt 4.2L) and reused the old mount bolts.

Thoughts?

Thanks,
Jim

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post #2 of 9 Old 07-20-2021, 07:16 PM
timatoe
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I re-used mine 15 years ago, they're still there.

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post #3 of 9 Old 07-21-2021, 09:24 AM
bpounds
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I think it is the 2.5 that has repeated issues with the motor mount brackets. Not really an issue on the 4.2, and as long as the original bolts are in good shape I say reuse them.

Bill

1988 Wrangler,4.2L I-6, Howell EFI JP-1,CRT HEI Ign,AX15 ext slave conversion, Zone 2" lift + 1" BL + 1/2" booms, BFG 31 x 10.5, Bestop.
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post #4 of 9 Old 07-21-2021, 02:45 PM
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I think you'll have more issues trying to find quality metric bolts of equivalent strength than you will reusing the old ones.


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post #5 of 9 Old 07-21-2021, 08:09 PM
Boojo35
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Torque to yield bolts and bolts that need to be replaced during a procedure has become dirty business IMO. Sure, some need to be replaced for sure. But, if a manufacturer puts a replacement footnote in some obscure place and that particular bolt replacement is not documented on a repair order it shifts or potentially shifts liability in stupid effing ways. This industry has become retarded.

If they are clean bolts, good threads, screw in an out with fingers, not rusty, and do not look distorted or thin in places. Reuse them.

If you cannot fix it with a hammer then it has to be an electrical problem.
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post #6 of 9 Old 07-22-2021, 09:41 AM
bpounds
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Quote:
Originally Posted by Waternut View Post
I think you'll have more issues trying to find quality metric bolts of equivalent strength than you will reusing the old ones.
Pretty sure the 4.2 has all SAE bolts. The motor brackets were either 5/16 or 3/8 NC.
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Bill

1988 Wrangler,4.2L I-6, Howell EFI JP-1,CRT HEI Ign,AX15 ext slave conversion, Zone 2" lift + 1" BL + 1/2" booms, BFG 31 x 10.5, Bestop.
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post #7 of 9 Old 07-22-2021, 10:08 AM
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Quote:
Originally Posted by bpounds View Post
Pretty sure the 4.2 has all SAE bolts. The motor brackets were either 5/16 or 3/8 NC.
right, don't think there was anything metric until the 4.0

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post #8 of 9 Old 07-22-2021, 10:49 AM
timatoe
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Quote:
Originally Posted by jbolty View Post
right, don't think there was anything metric until the 4.0
Could be mishmashed parts, but "most" everything on mine is SAE but some oddball stuff like power steering pump bolts are 15mm.

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post #9 of 9 Old 07-22-2021, 02:11 PM
Waternut
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Makes sense. I was just basing that off the 2.5L engines I worked with and I think those were 12mm because mine were messed up and 1/2" bolts wouldn't fit.


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