JDMackMan Posted August 20, 2015 Share Posted August 20, 2015 Hey guys! So what does everyone think in regards to oiling or not oiling threads on head bolts that are torqued in sequence? (i.e. Not bolts that are torque-to-yield). And should a head bolt that threads into an area that has coolant around it, be sealed with some kind of sealant? Quote Link to comment https://www.bigmacktrucks.com/topic/41438-head-bolt-installation/ Share on other sites More sharing options...
Gmerrill0516 Posted August 20, 2015 Share Posted August 20, 2015 I'm not expert but I always use some sort of lubrication on the threads and on the underside of the bolt or nut head I'm turning. You have to seal threads that go into a water jacket otherwise they leak. I don't recall what the Motors books say if anything on lubrication for torqueing. I guess I'll have to look... Quote Link to comment https://www.bigmacktrucks.com/topic/41438-head-bolt-installation/#findComment-300814 Share on other sites More sharing options...
Freightrain Posted August 20, 2015 Share Posted August 20, 2015 I'm thinking that most any automotive bolt is usually torqued with motor oil. At least the numbers they state are usually "with oil". A dry bolt will take MUCH more torque to get to the stretch required to stay tight.I know on Chevys, they use some sealant on certain head bolts due to water passages. I suppose the sealant is then the lubrication.If you use ARP type fasteners, they have their own lube and the torque is usually lower(due to better lubricity). I'm thinking about 10-20 lb/ft lower then "with oil". Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/41438-head-bolt-installation/#findComment-300824 Share on other sites More sharing options...
JDMackMan Posted August 21, 2015 Author Share Posted August 21, 2015 With oil on the threads, is what I normally do. Typically have used sae30 on the threads. But I figure any common engine oil would be good. Quote Link to comment https://www.bigmacktrucks.com/topic/41438-head-bolt-installation/#findComment-300859 Share on other sites More sharing options...
wheeler73 Posted August 21, 2015 Share Posted August 21, 2015 Mack states to use oil on the threads and under the head. No sealant on the bolts that go into water jackets. What engine are you working on? Quote Link to comment https://www.bigmacktrucks.com/topic/41438-head-bolt-installation/#findComment-300941 Share on other sites More sharing options...
wheeler73 Posted August 21, 2015 Share Posted August 21, 2015 Also forgot to say make sure the bolt holes are clean with no oil or coolant in them. Quote Link to comment https://www.bigmacktrucks.com/topic/41438-head-bolt-installation/#findComment-300942 Share on other sites More sharing options...
JDMackMan Posted August 23, 2015 Author Share Posted August 23, 2015 An old renault engine. Quote Link to comment https://www.bigmacktrucks.com/topic/41438-head-bolt-installation/#findComment-301162 Share on other sites More sharing options...
41chevy Posted August 23, 2015 Share Posted August 23, 2015 Also forgot to say make sure the bolt holes are clean with no oil or coolant in them.I usually run a tap through them to clear the threads too. Paul Quote "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’” P.T.CHESHIRE Link to comment https://www.bigmacktrucks.com/topic/41438-head-bolt-installation/#findComment-301164 Share on other sites More sharing options...
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