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Joined: Apr 2006
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Hi

Apologies if this has already been covered but my attempts at searching on keywords keeps finding more than 200 matches - I may even has asked this question some years ago myself ! ( the memory isn't what it was ).
engine
I have a special with what started out life as a 1961 5TA engine with the vertical bolts taking the rocker oil feed via banjos and also holding the rocker boxes down. The Exhaust rocker box is weeping at the joint face and I want to make sure everything is correctly torqued down.

The workshop manual I have refers to the "rocker shaft domed nuts" having a torque setting of 25 ft/lbs but does not provide a figure for the rocker oil feed bolt and domed nut. Does anyone know what the correct value is please ?

thanks

Phil

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The thing to look out for here is the middle lug on the head. I've seen quite a few of these distorted or even broken off by excessive tightening. I'd use like 7 to 10 lbft if I had to put a number on it. I do them up by feel myself and use new and annealed copper washers every time. If they still leak I may use some kind of liquid hydraulic sealant on them. One time I cut an O-ring groove and fitted a suitable O-ring on the feed bolt which solved a similar problem, as it left the rocker box gasket unpressurized.

Hope this helps,
SR

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Anneal the copper washers first, then make sure both the nut and bolt are "tight" - have good judgment

Last edited by C.B.S; 08/05/22 6:19 pm.
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Thanks for the tips guys - the head itself seemed OK when assembled and it went together with new copper washers on the banjos.
The rear bolt and rocker box seem fine and are oil tight - I need to re-torque the head soon anyway and at least these bolts do not affect that; will consider making a groove for an O-ring.

Took it out yesterday to a local TOMCC event and apart from leaking it got there OK ( only don @10-15 miles ).
Sadly the adjuster rod on the rearset gearchange came away on the way back leaving me stuck in 2nd but I did get a police escort part of the way !

Phil

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Use Dowty washers and you eliminate the temptation to over tighten in order to crush a copper washer.


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