Duramax7man7 505 #1 Posted April 29, 2017 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. Share this post Link to post Share on other sites
onanparts.com 174 #2 Posted April 30, 2017 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. 1 Share this post Link to post Share on other sites
Duramax7man7 505 #3 Posted April 30, 2017 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! Share this post Link to post Share on other sites
6bg6ga 271 #4 Posted May 1, 2017 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. 1 Share this post Link to post Share on other sites
Duramax7man7 505 #5 Posted May 1, 2017 Im guessing it wasnt used last time. Ha ha. Share this post Link to post Share on other sites
6bg6ga 271 #6 Posted May 1, 2017 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. 2 Share this post Link to post Share on other sites
Duramax7man7 505 #7 Posted May 1, 2017 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? Share this post Link to post Share on other sites
Dennys502 244 #8 Posted May 1, 2017 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. Share this post Link to post Share on other sites
Duramax7man7 505 #9 Posted May 1, 2017 (edited) What is the reason for that? I was under the impression that the Manufacturer recommends oil on threads at standard torque specs...? Edited May 1, 2017 by Mastiffman 1 Share this post Link to post Share on other sites
6bg6ga 271 #10 Posted May 1, 2017 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. 1 Share this post Link to post Share on other sites
6bg6ga 271 #11 Posted May 1, 2017 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. 1 Share this post Link to post Share on other sites
Duramax7man7 505 #12 Posted May 3, 2017 (edited) 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. Edited May 3, 2017 by Mastiffman 1 Share this post Link to post Share on other sites
Tankman 3,514 #13 Posted May 6, 2017 (edited) 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! Edited May 6, 2017 by Tankman 2 Share this post Link to post Share on other sites
6bg6ga 271 #14 Posted May 6, 2017 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. 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? 1 Share this post Link to post Share on other sites
Duramax7man7 505 #15 Posted May 6, 2017 (edited) 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 May 6, 2017 by Mastiffman Share this post Link to post Share on other sites