ricey Phil Rice Chessington Surrey (34 posts) Registered: 07/05/2017 02:19AM Main British Car: Mgb gt 1975 3.9 rover |
Rebuilt engine how tight is tight!!
Hi guys in process of building up Rover 3.9, everything has been checked as it's gone together ,all new beareings on mains and confide , all cibrid nipples facing each other etc, bores honed and new std rings fitted.
My question is I need appx 30lb torque to rotate the short engine, crank and 8 pistons fitted, timing chan and cam fitted but no lifters or heads. Have heard of anything up to 40 is acceptable, but having only built 4 pots with less drag, can anyone give a opinion on resistance to be expected? Certainly will turnover with half inch socket and normal length ratchet. Thanks Phil |
MGBV8 Carl Floyd Kingsport, TN (4511 posts) Registered: 10/23/2007 11:32PM Main British Car: 1979 MGB Buick 215 |
Re: Rebuilt engine how tight is tight!!
If you are using a beam style torque wrench what does it take to keep it spinning? Hopefully half of that. If so, then 30 to break free & 15 or so for constant is reasonable.
Also, consider variables such as piston rings (gapless or standard), shop temperature, viscosity of assembly lube, etc. |
ricey Phil Rice Chessington Surrey (34 posts) Registered: 07/05/2017 02:19AM Main British Car: Mgb gt 1975 3.9 rover |
Re: Rebuilt engine how tight is tight!!
Thanks Carl , it is 30 to break free, there are no tight spots when turning and I have used redline build grease which is sticky
Thanks again |