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[scotty]

Hi another thought undo the union nut where the single rocker feed pipe fits onto crankcase and ease out pipe, if you kick engine over oil should seep out of hole. If you get oil there then you have a blockage in the rocker feed pipe. Have you lapped in the oil pump discs in the timing cover, remember return pump has twice the capacity of feed pump but have to remove timing cover to check, lap pump discs, a simple lapping tool can be made with a bit ofround dowel and a couple of small nails when in wood cut the nail heads off leave 5 to 6 mm to engage pump discs.

[stinkwheel]

Over the years, I have found "crowdsourcing" fault finding on motorcycle forums is best. That way other people can add insight and errors can be flagged up. You can upload a video to something like youtube and post the share link here. You can alter privacy settings if you don't want it to appear on a search.



As above, the odd thing is, you have shown the feed pump is feeding oil into the crank/crankcase. If the scavenge isn't picking that oil up, by rights, the crankcase ought to fill up with oil. The only other ways out are onto the ground, into the primary chaincase via the crank seal (it would still need to be filled with oil level with the crank for this to happen) or out through the breather hole (it would be nearly brim full and would probably hydraulic lock).



So. Where is the oil going after it arrives in the crankcase? If you have the answer to that, you have the answer to your issue. Do you have a pressure relief valve fitted that could be malfunctioning?



The test scotty suggests would also be interesting.

[mauri]

have you check that the casket, distribution side is correctly aligned.



or is even missing a hole, wouldend be the first time.

[eolobass]

Today I dismantled the oil feed banjo, I started the engine and I ran it for a minute at about 1000 rpm ... a drop of oil did not come out of the junction nut ... then I turned off and restarted the engine , at this point about 15/20 cc of oil has come out, then only air. In the chain case oil at the right level, not a drop of oil on the ground, not a drop of oil comes out of the breather .. I don't know what to do! This thing drives me mad. I just do not seize or break the engine, because I use the bike every day, for about 30/40 km. in the next few days I undo everything and do the lapping of the parts, I have also ordered from Hitchcock's lighter springs and a new feed pump.
I hope this helps...what do you think?

[vince]

Hi, you may have to prime the return pump. Remove timing cover and fill the pump with oil as you rotate pump spindle. Before refitting cover squirt oil up the return until it appears at rockers. Refit timing cover and start engine. Oil should start flowing if system is operating correctly. Vince.

[p]

The only way for oil to get back to the tank is by route of the rocker feed tube then dribbling down into the oil tank; so unless the tank becomes empty, and assuming oil is going to crankcase then this must be happening.
Of course if there is a restriction in either one of the two tubes oil could be returning just via one of the rockers, running with rocker covers off would reveal. I think occasional surges of oil up to rockers may be the norm as the scavenge pump is intended to suck air until sufficient oil collects for it to self prime and pump it.
I have seen a clear tappet cover advertised, I suppose you could see the oil running down through one to confirm circulation, as you may, rather messily, by whipping standard one off whilst engine running.
In the absence of any other symptoms I am wondering if in fact your lubrication is working as intended... Maybe there's some other reason for your sudden noisy valves?

[eolobass]

hello, thanks to all for the precious indications. Today, with the engine running, I loosen (1- 1/5 turn) the quill feed bolt, and the oil comes out well. I also filled the banjo feed with oil, through the hole in the crankcase. Maybe the oil gets to the rockers in a discontinuous way, however the noise always feels. The tappets and valves are OK, and I do not know what else it can be. Some time ago, opening the covers of rockers, I always saw a lot of oil. Now I see very little. As I said, I will perform a thorough inspection of the parts, including lapping. Then I will keep you informed about developments ...

[eolobass]

Hi,some days ago I have change oil oil,and now I think problem solved...noise regular....bike run ok....I'm lucky....

[Sixty-5 Endevour]

Hi Folks

Would one of the Hitchcock see through tappet covers (Part No: 90030) help when wondering whether oil was reaching the rockers ?

Kind regards 65 E

[Adrian]

I had a BSA B40 with part of the rocker feed copper pipe replaced by translucent nylon tubing, no problems seeing the oil circulation there! A.