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Duramax7man7

Onan P220G Head bolts

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Duramax7man7

Can I just simply use a grade 8 bolt for this? I want about .25"- .5' longer as I re-tapped the hole and want to ensure proper long term torque on the bolt.

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onanparts.com
15 hours ago, Mastiffman said:

Can I just simply use a grade 8 bolt for this? I want about .25"- .5' longer as I re-tapped the hole and want to ensure proper long term torque on the bolt.

Original bolts were/are grade 8. Put a light coating of anti seize on the threads before installing. 

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Duramax7man7

Yeah that's what I figured being the top of the head bolts all have 6 lines on them and you're supposed to add two to the count of lines and that's your bolt grade.

Okay thanks. Wasn't sure if they were hardened a special way over being G8. Thanks!

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6bg6ga
On ‎4‎/‎30‎/‎2017 at 0:57 AM, onanparts.com said:

Original bolts were/are grade 8. Put a light coating of anti seize on the threads before installing. 

 

I'll second the anti-seize on the threads. Just a very lite application of it is all you need.

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Duramax7man7

Im guessing it wasnt used last time. Ha ha. 

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6bg6ga
12 minutes ago, Mastiffman said:

Im guessing it wasnt used last time. Ha ha. 

 

Unfortunately there are some around that swear off any type of anti-seize mention. I use it on any bolt now.

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Duramax7man7

Yeah, I use oil or some type of lube on most bolts after cleaning them and reinstalling them. Why not if you got it out. Ya know?

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Dennys502

If you use lubricant on bolts that are torqued you need to decrease the torque value by 25%.

I like to use anti seize on anything that could rust and be a problem when trying to remove.

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Duramax7man7

What is the reason for that? I was under the impression that the Manufacturer recommends oil on threads at standard torque specs...?

 

Edited by Mastiffman
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6bg6ga

Ask yourself what the block is made of. Then research the benefits of anti sieze with an aluminum block and make up your own mind.

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6bg6ga

When assembling lets say a short block chevy engine I always lightly oil the threads and I also use air pressure to blow them off and a light coat remains. I've always torqued in steps to the recommended maximum torque ratings let them set and re-torqued later. If its steel I generally use plain oil if its aluminum and steel I use anti-sieze, and sometimes I use anti -sieze and all bolts except head bolts going into a water jacket and they get permatex.

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Duramax7man7

Took your advice and used anti seize on all headbolts and manifold bolts. Thanks for the encouragement. 

Number 6 Bolt is the shiny new one. :)

20170502_160941.jpg

Edited by Mastiffman
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Tankman
On ‎5‎/‎1‎/‎2017 at 8:23 AM, 6bg6ga said:

 

Unfortunately there are some around that swear off any type of anti-seize mention. I use it on any bolt now.

Small can on Never-Seez and an acid brush last years. Every bolt gets a dab!

 

Never-Seez.jpg

Edited by Tankman
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6bg6ga
On ‎5‎/‎3‎/‎2017 at 9:09 AM, Mastiffman said:

Took your advice and used anti seize on all headbolts and manifold bolts. Thanks for the encouragement. 

Number 6 Bolt is the shiny new one. :)

20170502_160941.jpg

 

Do you happen to remember the length of the bolts needed?  I got a B43E for nothing that I put a new piston and rod in. Unfortunately it was short head bolts and I don't really want to pull off the other side to get a length. Grade 8 right?

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Duramax7man7

Congrats!

 Yes they are 5/16" Grade 8 @ 2" I believe with a maximum of a 1/2" unthreaded collar on them just below the head. But you can run all threads if you can't find the right collar.

 OR Contact Lincoln @ A-ZTractor. One of our sponsors. He has some Onan head bolts. He was going to send me one for free with an order that I placed but I couldn't wait and found one locally. ha ha. I will get my odds and ends order from him for my two newest acquired WH's this week... Parts for a 94' 314h and 91' 520h.

Edited by Mastiffman

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