[TR] Re torque TR4A head, hot or cold ?

Randall tr3driver at ca.rr.com
Tue Jul 31 23:10:44 MDT 2018

> this makes no sense. To get it hot it has to run, but one 
> wouldn't run it without it being torqued down especially with 
> wet liners. 

Which is why they call it RE-torque.  Initial torque done cold, retorque
done hot.

The TR3A owner's manual actually specifies retorque hot, although that
particular item was left out of the TR4-4A manuals.  Instead, you were
supposed to return to the dealer for the initial service.

That said, I've never been able to tell that it made any difference. The
steel studs expand at almost exactly the same rate as the cast iron head, so
the only difference would be the relatively thin head gasket.  I suspect the
whole hot/cold thing has more to do with convenience (not having to wait for
the engine to cool when brought to the dealer for initial service) than

For cast iron heads, anyway.  Alloy heads expand much faster than the steel
studs, which is why it's important they be retorqued cold.

-- Randall  

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