G'day All,
Some of you may know through other forums as well as here that I recently got my 1938 ES2 on the road after basically dismantling the whole bike bar the engine, and then putting it back together over the last couple of years. So far I have clocked up nearly 200 miles and the motor seems to run really well. Today I decided I would take the crankcase timing cover off and make up a new gasket to stop oil leaking out the bottom. When I removed it there was no oil feed jet or spring in there. Could this have caused some damage ? I'm guessing without the jet there the oil would not have been the under pressure into the mainshaft and associated bearings etc. In fact some would have been just dribbling down into the timing cavity.
I rummaged through a few boxes of spare I picked up and found a 3 jets, one of which I have fitted but now I'm not sure if it's the right one. Here it is:
A friend of mine thinks this is for models up to 37 and that from 38 onwards the jet changed to a plain round one without holes in the side. One of the other one's had a larger hole in the end, probably double the size of this one, but otherwise looked the same. Maybe I should have fitted it instead ? Any thoughts ?
Also how long is the spring supposed to be or how far should the jet protrude from the holder if you push it in and compress the spring ?
Glenn
Not having an oil feed jet…
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Thanks for your reply Rich…
Thanks for your reply Richard. I'm not sure if perhaps I should have cut the spring a little shorter, there was still probably 3 or 4mm sticking out when pushed into holder, perhaps there is a little to much pressure on the crank. I'm guessing the oil comes from through the bottom end of jet but if the spring was to tight and therefore not much space between coils the oil wouldn't be able to flow through side holes so easily. Not sure why the side holes are there though. Also after reading the thread about oil pumps I'm not sure also if the fibre washer is sealing against the cover after putting a thin gasket there. Is there any way to tell ? Maybe I should have put another fibre washer in place. Oil seems to be circulating fine but in saying that, it was when the oil jet was missing ! I did the first long ride on the bike yesterday and it ran well. About 150 miles, however there has been a pesky oil leak from under the rocker box spacers which I attended to today. There was a gasket under one spacer and not under the other, go figure. I am holding grave fears about the engine now. I guess time will tell and if I do have to rebuild the engine one day then I can honestly say I will know every nut and bolt on the bike which would be at least put my mind at rest. This weekend is the Ross Rally here in Tasmania which is the biggest get together for old bikes during the year. I will be riding down for that and it will be great to have a bike to display at long last. Admittedly the front wheel is a spare as the original is still away getting repaired as last bloke stuffed it up, and dynamo and regulator are away getting overhauled. I think I'll pull the timing cover off again and have a look before I go, but I'll be there.
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If you are getting oil lea…
If you are getting oil leakage out of the rockerbox spacers I would think that there is a good circulation.
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Previously wrote: If you a…
Previously wrote:
If you are getting oil leakage out of the rockerbox spacers I would think that there is a good circulation.
That' was what I was thinking Mike, but I was a little concerned that If the fibre washer was leaking a bit that perhaps the pressure would be down which might effect just how much of the oil is getting to certain places. There was however a lot getting up to the rockerbox area. I was going to have another look but turns out I've put the magneto sprockets on tighter than they were before and now I can't get them off without a puller which I don't have. Another excuse to buy more tools for the workshop.
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Not having an oil feed jet is a worry. However, as was pointed out in the Old 'Commando Service Notes', if the oil is being sprayed into the crank, centrifugal force will carry some round. However, oil pressure in general will be non-existent. If you haven't seized and the big end isn't knocking then I wouldn't personally see the need to investigate further at present, other than that it says a hell of a lot about the engine rebuilder.
You're correct in saying that the jet changed for the OHV and SV engines for 1938 (but the old part no.9011 continued for the OHC engines). The jet that you've shown looks to me like the 1.055" long 1937 pattern.
As the old jet continued alongside the new 8834 part for the OHC engines, there is an illustration of both on page 4 of the 1938 parts book. Unfortunately, there isn't much detail but the 1938 part looks shorter. This is logical as the smooth 1938 cases don't have the jet fitted from the outside and retained by a cap.
[IMG]http://i248.photobucket.com/albums/gg164/commando16h/NOC/pI-4.jpg[/IMG]
From memory, the jet on the 1937 engines will push pack flush without the spring becoming coil bound. There should only be a light spring pressure as the oil will do the rest. You certainly don't want the jet bearing hard on the crank nose.
I hope this helps. Good luck on getting it sorted once and for all !