pcv valves and oil leaks

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If you are referring to the oil return line, absolutely not, for a PCV valve. The anti- sump valve goes in the feed line. The oil filter is the only thing between the pump and tank on the return line.

Since the breather hose has been misplaced at the oi tank many times, follow the breather line from the top of oil tank to the crankcase. What year is your bike? On a 1972 this will be at the rear, lower center of the crankcase. Item #46



1972
pcv valves and oil leaks


If you have other years, refer to: http://www.nortonmotors.de/ANIL/Norton Website/norton/parts-list.php
 
I have a 1973 850. Judging fromt he schematic on the Andover site, it looks like the breather outlet is covered by a capnut. Is this correct, or am I looking in the wrong place?

Will definitely install the anti-wetsump check valve on the FEED line from the bottom of the tank, as you recommend. Does it matter where I install it in the line?
 
bigstu said:
I have just got an 1973 850 MK2a back on the road and would like some advice if possible from more knowledgable Norton folk than me.
I appear to have some oil leaks from my engine. This does not suprise me, as I seem to be quite adept at putting engines together that leak.
No 1 leak deposits oil on the leading edge of the primary drive cover, but is coming from somewhere close to the L.H. exhaust manifold. I can't really see any more than that...maybe the head gasket just under the exhaust?
No 2 leak seems to be coming from the small rocker shaft covers, with their multiple gasket/dodgy bits of tin.
No 3 leak seems to be coming from the the rear rocker adjusting cover, with its sigle nut fixing onto a cover that must act as a large diaphram spring?

So any tips would be greatly received. I am not about to strip the bugger down right now though...it runs OK.
I am however interested in PCV valves. I am interested in any PCV valve I can install in line in the large breather pipe which comes from the timing cover, where the mag used to live on an Atlas...Again I am not about to strip the motor down to use a CNW job.
I am figuring that reducing crankcase pressure may reduce oil leaks...
Thanks, Stu.
Click to expand...

I've been using a master cylinder brake booster valve used on a ford for years. It has the right diameters and is at a right angle. http://www.macsautoparts.com/ford_mercu ... gQodhHwArw
 
Stuart SS said:
Hi blokes.. been a time between drinks...

I have mentioned my PVC set a number of times and give it the thumbs up for many years now.. As stated mine is a common GM (Holden - Australian) version sourced up from the local Auto accessory dept (Repco) for $20 ~ (Could be had easily from a wreckers too ~ if second hand does not bother you !)

The only criteria I have seen is that the valve should ideally placed as close as practical to the oil tank rather than the crankcase ~ And as previously stated the oil leak / misting was dramatically reduced !


I was going to install one on my current T150V Special Trident , but being a triple with 120 deg spacing of journals on the crank, the crankcase pressures are not the same deal as twin such as the Commando ~


As for Black sausage ~ :shock: :shock: :shock: About appealing as eating Brains ~ or Tripe ~ very sick puppies ` some !! ! :roll: :D :D :D
Click to expand...
"Sweet Breads and scrambled eggs", don't knock it until you try it!
 
Comstocks screw in c/case breathers are the best in my opinion, I have them in one road bike and two race bikes.
Regards Mike
 
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