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Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 14893
Experience:  Certified on Onan and Generac generators
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What are the head bolt torque settings for a GM 1.6l 4cyl.

This answer was rated:

What are the head bolt torque settings for a GM 1.6l 4cyl. industrial engine? fuel is propane application is home stand-by generator.

GM Tech (Cam) :

Hello, I'm Cam. Please include all the details about your issue so I can accurately advise you. I cannot see your vehicle so please be detailed.

GM Tech (Cam) :

What year is the engine?

Customer :

I bought the genset in 2006, so might be 2005.

GM Tech (Cam) :

One moment.

GM Tech (Cam) :

Is it an overhead cam, dual overhead cam?

Customer :

OK, this is on a Kohler generator, SOHC.

GM Tech (Cam) :


GM Tech (Cam) :

I need to send your question the small engine group as they have these specs.

Customer :


Thank you for choosing Just Answer for the solution to your problem.
My name is XXXXX XXXXX I am going to assist you with this.


When installing a head, you should always use new head bolts - do not reuse the old ones.

Torques specs are:

Initial sequence - 25N-m (18 ft-lbs)

Second sequence - 60 degrees

Third sequence - 60 degrees

Fourth sequence - 60 degrees


Customer: replied 6 years ago.

Thanks, XXXXX XXXXX click the "accept" I should probably add that for right now I am trying to just tighten the bolts to try to limp along for a bit warmer weather--a few days or so. There's a small oil leak from the head/block gasket. So, also I'll need to know the proper sequence of the bolts, starting from the center. Not sure what the numbering is.

Then I think I'll be ok. Maybe I'm safe just starting at the center, and alternating?



If you will give me 5 mintues, I will upload a diagram of the proper sequence for you.



Customer: replied 6 years ago.
no problem thank you very much

Here you go, my friend.


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Hank F., Technician
Category: Small Engine
Satisfied Customers: 14893
Experience: Certified on Onan and Generac generators
Hank F. and 3 other Small Engine Specialists are ready to help you