Bolts, studs & nuts etc for main components like: main and rod bearing caps and heads, should the threads and undersides be clean and dry, or lubricated? Which gives accurate and consistent torque settings?
Question- engine assembly
- Thread starter igotta40
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I think every bolt/nut needs anticize or thread locker of some type. More important to me is torqued by thirds in proper sequence.
Chase the holes with a tap, wire wheel the bolts. Use a good torque wrench.
Chase the holes with a tap, wire wheel the bolts. Use a good torque wrench.
ARP spec is to lube the underside of the bolt head… but I’ve never done it (or used ARP bolts much!) I think clean and smooth is what most people do, and as Charlie points out whatever thread treatment you need.
- Thread starter
- #4
Yes, ARP provides their own lube with their fasteners, but I’m using the OEM factory ones.
I lube everything with the relevant oil - under bolt/nut being torqued and lightly on thread. Italians have a name for it - lubetorquing. When retorquing a diesel head after initial run I back each fastener off 2ish turns in correct order, relube under face then final torque