Razkid 68 #1 Posted May 21, 2017 I'm ready to install the heads and intake back onto the engine. I chased the threads of the bolts and the block and flushed them with brake cleaner and air. Do I oil the bolt threads before installing them? I would think you would for the head bolts to get the correct torque readings but since there aren't any lock washers on intake bolts, do you use thread locker instead of oil? Thanks in advance. Share this post Link to post Share on other sites
boomers_influence 106 #2 Posted May 21, 2017 raz i have always used a lite coat of anti sieze on the head bolts, BUT, i stay on the low side of the torque spec. thank you. boomer ( the used onan engine parts guy, also NOS and new ) 2 Share this post Link to post Share on other sites
WHX?? 46,688 #3 Posted May 21, 2017 I prefer antiseize as well but some guys use oil. I don't think it matters either way as long as you torque to specs and use something to make metal slide together nicely. Correct pattern is a must and is in the manual. 1 Share this post Link to post Share on other sites
Razkid 68 #4 Posted May 22, 2017 Thanks guys. What about the intake bolts? Share this post Link to post Share on other sites
Kurt-NEPA 755 #5 Posted May 22, 2017 (edited) 23 hours ago, boomers_influence said: raz i have always used a lite coat of anti sieze on the head bolts, BUT, i stay on the low side of the torque spec. thank you. boomer ( the used onan engine parts guy, also NOS and new ) Plus 1 on what boomer says. I use a light coating of Permatex anti-sieze. That includes the intake and exhaust bolts too! Edited May 22, 2017 by Kurt-NEPA Share this post Link to post Share on other sites
WHX?? 46,688 #6 Posted May 23, 2017 Torque all bolts on any engine is my motto Raz....if the manual doesn't give specifics for that assembly use specs common to that bolt size. If you don't have those let us know we'll get you them. Share this post Link to post Share on other sites
Razkid 68 #7 Posted May 24, 2017 I always torque bolts during assembly! Heck, I even torque the lug nuts when I swap wheels around on my cars. I do have the specs for the bolts but since the intakes are only 6-10 ft-lbs and there aren't lockwashers on the bolts, I was concerned about them loosening up without some type of thread locker on them. It looked like there was something white in the threads and on the bottom of the bolts when I cleaned them so I thought it might be some kind of threadlocker. I'll give the anti-seize a try and see what happens. Thanks to all who responded. 1 Share this post Link to post Share on other sites
WHX?? 46,688 #8 Posted May 24, 2017 4 minutes ago, Razkid said: even torque the lug nuts when I swap wheels around on my cars. always a good move A little medium strength (blue loctite) on the manifolds would not hurt. Share this post Link to post Share on other sites
Huntingtown520hc 6 #9 Posted February 24, 2021 Replacing a bad valve gasket on my 520 hc ... does anyone have the torque settings for the intake manifold and the exhaust bolts? Share this post Link to post Share on other sites
lynnmor 6,762 #10 Posted February 24, 2021 1 minute ago, Huntingtown520hc said: Replacing a bad valve gasket on my 520 hc ... does anyone have the torque settings for the intake manifold and the exhaust bolts? Download the Service Manual it will have everything you need. Share this post Link to post Share on other sites
Handy Don 10,548 #11 Posted February 24, 2021 3 minutes ago, Huntingtown520hc said: Replacing a bad valve gasket on my 520 hc ... does anyone have the torque settings for the intake manifold and the exhaust bolts? Share this post Link to post Share on other sites
Huntingtown520hc 6 #12 Posted February 24, 2021 Awesome thanks Share this post Link to post Share on other sites
richmondred01 2,202 #13 Posted March 4, 2021 I use grease. Learned that from working on Model As and flathead fords. Share this post Link to post Share on other sites
