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tips, technology, tools and techniques related to vehicle driveline components

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ricey
Phil Rice
Chessington Surrey
(16 posts)

Registered:
07/05/2017 02:19AM

Main British Car:
Mgb gt 1975 3.9 rover

Rebuilt engine how tight is tight!!
Posted by: ricey
Date: July 17, 2017 08:25AM

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
(3232 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
79 MGB, Buick 215

authors avatar
Re: Rebuilt engine how tight is tight!!
Posted by: MGBV8
Date: July 17, 2017 10:30AM

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
(16 posts)

Registered:
07/05/2017 02:19AM

Main British Car:
Mgb gt 1975 3.9 rover

Re: Rebuilt engine how tight is tight!!
Posted by: ricey
Date: July 17, 2017 11:35AM

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


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