Oil circulation procedure

[volker.halbach]

Terry, I am sorry. You can confirm your suspicion by blowing into the pickup pipe and blocking the copper pipe at the other end where it comes out of the crankcase. If you detect a leak there, I cannot think of another solution than to split the crankcase.

[Mick D]

Hi Terry

You can do a bit more diagnosis before you gain access to the pump, do as I and others have suggested and blow up the pipe, if it passes air easily you have a leak in the system, if it passes air when you kick the bike it has a priming problem, if it doesn't pass air you have a blockage.

Highlighting where the problem may be helps in location when you dive in deeper.

Regards Mick

[Terry.C.]

HI guy's, The saga continues.
So far I have discovered that the oil sludge trap was totally blocked Nd I did not need to strip the engine down as access was possible via the sump.
But so far no circulation of the oil even whr running the engine for a few minutes
Next technical question.
Next to the bottom of the oil pump on the left hand side there is a hole which spews out oil into the timing case.The oil spew is no where near the run of the timing chain.
Looking at Drags parts list from 1941 to 1951 there was a non return valve fitted in there part no's 81 82 and 84 nothing is listed for 1953.
It seems they replaced it for 1956 to 1958.
The question is should it be blocked off and could it be drawing in air at this spot causing the oil circulation problem?
Looking forward to your replies
Regards
T

[volker.halbach]

I am not quite sure which hole you mean. Is it a hole left to the oil pump, and you can see it with the oil pump fitted? Then that will be a hole that connects the outer with the inner timing case. It should be open.

Now it sounds more as if the problem were the supply side. If the sludge trap was full, the oil ways in the crank may be blocked. Are you sure the oil reaches the big end bearing? You can test it by removing the sump plate plus the outer and inner timing case and then pumping oil into the end of the crankshaft. If you use thick oil, it can take some time until the oil drips out of the engine sump. But if you cannot pump oil through the crankshaft, it will mean the crankshaft has to come apart.

[nevhunter]

The quill that feeds the mainshaft is not a good fit, so oil will pass into the Motor anyhow but not through the Big end Bearing. With all the Muck in that Plug the Motor Must have done quite a bit of work and perhaps not been that well serviced. Maybe forcing oil at High pressure into the Mainshaft will Move the grunge? Flush it afterwards to remove all of the sludge. If it's the Tapered Pin it won't have a Cage and will Just be crowded rollers. Chances are, the Big end is Pretty ordinary so JUST replace it. IF it's done 30K Miles it owes you nothing. Nev