Combat rocker shaft oiling

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Torontonian said:
The Norton C. head is over-oiled. Restrict oil to rockers. Follow manual.

Cheers Toronto

I am rebuilding a combat motor and very keen to be taught the correct way. Please excuse me for talking bullshit as I've said mick hemmings hasn't told me to gfm for over a year so I am getting better.
Anyway if you haven't made a mistake what have you made. I'll get the manual out ,read and keep my mouth shut. But first what is a lash cap?

Happy days

J
 
auldblue said:
ut first what is a lash cap?

Combat rocker shaft oiling
 
Ok I forgot which type spindle was in Combats just that all Cdo' fit em to cover oil paths to become the most restrictive part of head oil flow so the end feeds alignment don't matter, so still wondering is any dermal modification is desirable other than to actually fit reasonably ? Btw Peel's Combat head ran lash caps and light mushroom rockers that had to be installed before rockers on spindle and the rockers tediously shimmed centered.
 
Hi gnipper

Cheers for that , it's a shim, I don't think I'll be needing these in my engine . However I did notice damage to the valve tips, one wouldn't pass through the guide and the others had been dressed at some point.
 
Cheers buddy for the heads up but we must be reading different books cos I cannot find the word restricted anywhere on page 14.

By the way you push rod oil seal work a treat.
J

There is not the "word" restricted.
Sorry I speak the language of physics....not lawyer language

on page 14 "The banjo bolts used on this feed kit are SPECIALLY METERED to allow the correct amount of lubricant to be fed through them and properly DISTRIBUTE between the cam and rocker assembly."

Since the oil pump is the only active device, the passive components down stream MUST use sized restrictions to balance the flow. They chose the banjo bolts to do that job.
I have seen and measured one of the roller bearing Dunstall lubed cams but it cam out of a blown engine and I did not see the rest of the kit. I would highly suspect the cam flow had the restricting device.
 
Cheers for that dynodave

Some would say that I don't even speak English , I've had my ass kicked before , I'm happy if it's for good reason I'll learn from it.

Happy days
 
Actually there is nothing on page 6 particularly relevant to this subject.
Try page 14 which does refer to banjo bolts with a restricted flow to balance cam lube VS rocker lube. lubed cam is shown on page 17.
I looked up the Paul Dunstall manual and had a look for myself. No diameter of the restricting hole was mentioned. Others have said that Norton Commando heads over-oil but I can't see where it would be a problem. Extra oil would cool the head and flow down the regular drain holes and push rod tunnels. I can see where it might be a problem if it got deep enough in the head to get into the exhaust valve guides but that seems doubtful. Dave, do you happen to know why it was an issue with the Dunstall engine?
Dan.
 
The conversion from camshaft end crankcase breather into cam lobe oiler allowed a huge hole that would rob oil from the normal system. The restriction would limit the flow to the cam lobe oiling but help retain normal oiling to the crank and rockers.
Over oiling?
 
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