Re: re-torquing head question

Posted by RAB on January 11, 2002 at 13:28:30 from (195.93.50.167):

In Reply to: re-torquing head question posted by greg on January 10, 2002 at 16:18:45:

This depends on several things.
Never ever retorque an aluminium head unless cold as distortion will occur - OK, so we are probably talking cast iron for most tractors, apart from small garden/horticultural types and definitely cast in this case.
Type of gasket - some new engines use throw-away, use-once bolts. These are mainly on automobile engines, but this type have a special gasket material and bolts and retightening is just not required or safe (mechanically) to do.
Take heed of the workshop manual - if there is an instruction, follow it.
The more important factor is probably the tighening sequence for the bolts.
Generally, or hopefully, the head surface should be flat when you put it on, so retighten it when it is flat, ie cold. This avoids tightening when the casting is trying to change shape (On heating).
Practically, with very old tractors it probably doesn't matter too much whether hot or cold with cast heads but don't overtighten to try to stop leaks - get the surfaces skimmed flat if possible, if they need it.
Hope this helps. I know you stated your make and model, but I wouldn't want anyone to think there is only the one best way to do the job for any engine.

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