Help with torque for oil pump bolt

[Chief123]

1986 4.3 OMC. Have a new long block, that I had finished installing most of the parts on---valve covers, intake , carb, etc.
Hoisted the engine up and was going to install new oil pump and then the pan.
Put the pump on and tighten the bolt with ratchet --then rechecked torque in book and set torque wrench to 65 ft lb.s. I made about 2 pulls and on the 3 I felt that dreaded release of bolt..
So I stripped the rear main cap where the oil pump attaches to..
I rechecked the book ---65 FT LBs, checked my torque wrench and it was spot on as some might say.
Get on internet and find what I think is a OMC OME site and the info they have is:
15 FT LBs + 65 °--which I understand and sound more reasonable.

So can anyone confirm correct torque.

BTW-- I had a new SELOC manual, which I threw away--worthless!
I was using a CLYMER manual which I had just bought new .

Tks for any help.

 

[Bondo]

1986 4.3 OMC. Have a new long block, that I had finished installing most of the parts on---valve covers, intake , carb, etc.
Hoisted the engine up and was going to install new oil pump and then the pan.
Put the pump on and tighten the bolt with ratchet --then rechecked torque in book and set torque wrench to 65 ft lb.s. I made about 2 pulls and on the 3 I felt that dreaded release of bolt..
So I stripped the rear main cap where the oil pump attaches to..
I rechecked the book ---65 FT LBs, checked my torque wrench and it was spot on as some might say.
Get on internet and find what I think is a OMC OME site and the info they have is:
15 FT LBs + 65 °--which I understand and sound more reasonable.

So can anyone confirm correct torque.

BTW-- I had a new SELOC manual, which I threw away--worthless!
I was using a CLYMER manual which I had just bought new .

Tks for any help.

Ayuh,..... Google up what Chevy oil pump bolts torque too,.....

It's a 3/8" fine thread ain't it,..??
I'm thinkin', 35/ 40 ft.lbs,....

 

[bruceb58]

First thing you need to do is get an OEM manual.

The 65 is about right for the rear main cap. That lower tourque is for a connecting rod.

My guess is your torque wrench is wrong.

 

[MRS]

Ya what Bruce said or when you first put on maybe you where at the right ft-lbs.and over did it?
Here are the specs, from the omc manual mine is a 1986 also so the manual is for a omc and is a omc manual.

 

[Idlespeedonly]

Dont worry about it. Take the cap off and put a heli-coil in it.

 

[Howard Sterndrive]

and it looks like those specs are for clean dry threads. If you have oil on them or any other fluid (including uncured loctite), you need to reduce torque.