From:Dave Hennessey e-mail:dave-A-toyhouse.org
Subject:RE: RE: Torque of head bolts on 165cc Date:Tue Oct 9 10:23:02 2012
Response to:17859
I found this torque chart on Engineer's Handbook (very wonderful site)
http://www.engineershandbook.com/Tables/torque.htm

Standard hardware store nuts and bolts are grade 5 (3 lines on the head). Not sure what grade those CP 1035 and 1038 bolts/nuts are, but I would go with grade 5.

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Those Sportster instructions are probably for a NEW sportster that uses NEW type stretchable bolts. NEW cars (well, probably for the last 15 years) use these stretchable bolts on the cylinder heads, and require a torque-angle gauge to install. These NEW head bolts are designed to be used only ONCE - after they stretch, they're useless - throw them away. So don't follow these instructions on your Hummer.

Dave


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Gene,

I have gone through my manual and can find nothing about the head bolt
torque. Don't know if it will help, but nightrider.com has a page on torque
specs. They indicate that, if you don't know, torque based on fastener size.
I think that the studs are 5/16", so should be 19 ft lbs (if you buy this).

http://www.nightrider.com/biketech/hdtorquevalues.htm

Don't know how the process on the lightweights compares to the Sportster,
but this outlines that process - remember that the Sportster uses 7/16"
bolts...

Head Bolt Installation
Factory Method

For each cylinder head, start with head bolt numbered one. In increasing
number sequence (1-2-3-4), tighten the head bolt in three stages.

1. Tighten each bolt to 7-9 foot pounds of torque.

2, Tighten each bolt to 12-14 foot pounds of torque.

3. Mark each head bolt and head with aligning marks. Tighten each bolt 1/4
turn (90 degrees).

Hard to believe that the manual doesn't cover this.

CJ

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What is the proper torque value for the head bolts Also what is the
best gasket sealant to use?