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Old 1 Week Ago
mightyohm's Avatar
mightyohm mightyohm is offline
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Default should main bearing bolts be oiled when installing?

Should the bolts that hold the main bearing caps be installed with threads oiled or dry?

Torque spec in the series 5 WSM is 55 ft-lb. But nowhere does the book talk about installing these bolts oiled or dry.

What about connecting rod nuts, head studs and head bolts?

Typically I put a light coating of oil on all of these parts during assembly but now I am second guessing myself!
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Old 1 Week Ago
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It DOES make a difference. I oil the threads or use #105 (Lubriplate) assembly lube.
The two head studs, you don't want them backing out and/or tightening them TOO tight. I have seen a crack starting due to excessive tightening. I had to get the 1725 block welded by a crack block specialist.
Please use a red lock-tight compound and just snug them in (10 ft pounds MAX)
Jan
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Last edited by jumpinjan : 1 Week Ago at 12:19 AM.
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Old 1 Week Ago
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Jan - Thanks for the tip about the loctite on the studs. I will continue to lightly oil the other bolts prior to installation.
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