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Help needed for some engine torque specifications.


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arscs
New User

Jan 28, 2017, 5:58 PM

Post #1 of 2 (281 views)
Help needed for some engine torque specifications. Sign In

I have a Chevy Malibu from 2000 with a 3.1L V6 engine. I have a friend that is a truck mechanic that needs the torque specs for the main bearing and connecting rod caps. I have a Haynes repair manual for Chevrolet Malibu 1997 through 2003. It says that for 3.1L V6 engines there are two steps for tightening the main bearing and connecting rod caps. The first step is written in Ft-lbs units and the second in degrees. He doesn't quite understand what to do with these units.

For the main bearing caps it says:

step 1-> 37 Ft-lbs
step 2 -> Tighten an additional 77 degrees

Does this mean he should tighten for 37 Ft-lbs with the torque wrench and then turn an additional 77 degrees? Is it as simple as that? Thanks in advance for any help.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jan 28, 2017, 8:37 PM

Post #2 of 2 (233 views)
Re: Help needed for some engine torque specifications. Sign In

That's because they are "Torque to Yield" bolts that actually are made to stretch.

You start out torquing them to 37 ft lbs, Then you tighten each one to 77 degrees of rotation. An entire circle is 360 degrees and a half circle is 180 so 77 is a little less than a quarter turn additional. They make tool to measure the exact degree of turn.



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