Evinrude 40 hp torque settings, too low?

[Intermediate Mariner]

I tried to post this in engines but cannot post, anone know about that?

Anyways, I am starting to reassemble powerhead on '62 evinrude lark IV after a re-bore.

The book says 348-372 inch pounds which is 29-31 foot pounds. The thing that throws me is I had to never have gotten those off! I had to use a breaker bar AND have a buddy help me hold the sucker down. 348 foot pounds would be more like it, those bolts were on there!

Does that sounds right?

Thanks Gents,

Shawn T
Wichita KS

 

[royal0014]

Re: Evinrude 40 hp torque settings, too low?

The bolts probably have not been off since 1962. Go by the book. And I would try to find new bolts.

 

[Intermediate Mariner]

Re: Evinrude 40 hp torque settings, too low?

Thanx for the reply Royal, much appreciated. Yes, they probably have not been off in a long while.

Let me ask you this: One time I had a head gasket replaced by an experienced OMC mechanic. He torqued the bolts down and then ran the engine for 5 minutes and they were all lose and had to be re-torqued. DO YOU THINK the same could apply to rod bolts? Should one go a few inches tighter?

Thanks!

 

[royal0014]

Re: Evinrude 40 hp torque settings, too low?

Ok, this is my thought: The reason for the re-torque is because metal swells as heated. By the time you tore the motor down to get to the rod bolts, everything would have cooled off. So just go by the stated torque there. But, do re-torque the head. There is usually a sequence for torqing the head, if not, do a criss-cross pattern.

Maybe one of the OMC guru's could chime in here.

 

[mikesea]

Re: Evinrude 40 hp torque settings, too low?

The torque inch pounds are right.The rod bolts are to be installed using lock tite ,that is why it is had to get em loose,same reason not needing re torque.You do need to recheck headbolts you have heat and cooling changes .Most important thing is the EVENESS of tightening ,more than the torque itself.I hate disagreeing but,torquing a head you start in the middle and spiral outward,doing increments like 50 100 150 200 and ,you want to find out your final from the book.AGAIN INCH pOUNDS