Engine Head Bolts-How much torque?

J

justin14

Recruit
Joined
Jul 15, 2008
Messages
2
I have a 1986 OMC 3.0L 140hp engine in our boat in which i am replacing the head gasket, and i am wondering how much torque in ft-lbs i should apply to the 10 bolts which hold the head together.
 
S

sea wolf

Lieutenant Junior Grade
Joined
Apr 3, 2002
Messages
1,219
Re: Engine Head Bolts-How much torque?

90-100. Hope you know the sequence.
 
K

Kessi

Cadet
Joined
Jun 25, 2008
Messages
20
Re: Engine Head Bolts-How much torque?

I keep the upper limit to 90-93. Don't forget to coat the bolts. I also add a little white lithium grease under the head of the bolt, a machinist told me that trick.
 
bruceb58

bruceb58

Supreme Mariner
Joined
Mar 5, 2006
Messages
30,806
Re: Engine Head Bolts-How much torque?

You do it in 3 steps:

35

65

95

And in the proper sequence as outllined in the service manual that you should probably get.
 
bruceb58

bruceb58

Supreme Mariner
Joined
Mar 5, 2006
Messages
30,806
Re: Engine Head Bolts-How much torque?

I will try to show the sequence:

REAR

9 10

5 6

1 2

4 3

8 7

Front


Does that work for you?
 
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