Sorry that I seem to be hogging this forum but just when I thought everything was generally OK I find oil hissing out from the joint between the back of the timing cover and the Lucas magdyno (up the top at the drive end). My spares book doesn't show any seal there so what stops oil escaping? Could it be that there is no seal and I've got a blocked timing case drain? I don't want to start stripping it all until I know what I'm looking for. Thanks for any help.
Overthinking - you could b…
- Log in to post comments
I have also considered bre…
I have also considered breathing issues in relation to the leak from my 19S camshaft bush. I probably mentioned this before but I have tried the standard breather with ball, a straight through connector with open end, and the same connector with Enfield "Duck Bill". None of them made any noticeable difference to oil flow. This doesn't prove that it is not a breather issue. The purpose of the ball is to expel air from the crankcase on the downstroke and prevent air entering on the upstroke. Ideally this would create a partial vacuum in the cases. Without positive pressure in there oil leakage should become less likely. Other breathing arrangements have been discussed on this forum, including the use of a 2-stroke reed valve and an additional breather from the rocker box tappet cover. If the camshaft bush leak is driven by crankcase pressure these ideas should help, but I haven't yet tried them.
An unlikely possibility but I'll suggest it anyway: could there be any variation in the position or size of the hole that drains the timing case oil back to the crankcase? I guess George's case is still open so if anyone else is able to take a pic of that area a comparison might be useful.
Ian McD
- Log in to post comments
George, I have rummaged an…
George, I have rummaged and found my spare timing case, being my spare I need to be convinced to let it go! Iâm building a M50 from bits and need some parts, notably the spindles, axle, speedo drive and spacers etc for a full width rear hub and tinware, have you got anything to tempt me?!
Dan
- Log in to post comments
In a word, No, Dan. Apols.…
In a word, No, Dan. Apols. But I'm having the timing case oil prv boss built up and re-tapped. I'm simply trying to find out through this thread why I get so much oil out of the timing chain compartment.
I cant' seem to get my pics to load, Ian. They are too "good". Or put another way, too may bytes. I don't know how to reduce them.
George
- Log in to post comments
Do you use a photo hosting…
Do you use a photo hosting website? Itâs easier that way.
- Log in to post comments
You lost me after "Do you…
You lost me after "Do you use......", Dan!
George
- Log in to post comments
I use a free program calle…
I use a free program called pixresizer. Very easy to use and works very well.
- Log in to post comments
Overthinking - you could be right Ian. But just to see if I'm on to something - I have previously removed the ball from the left had side c/case vent. This means on the up stroke the air will be drawn in through that vent. This will reduce the amount of air/oil drawn in through the timing case drain hole which in turn could allow the oil level to raise to a level where it percolates out through the camshaft bush. Could that be why the Norton engineers fitted the "non-retrn valve" ball on the c/case vent?
George