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G3 No oil return and wet sumping at the same time? #764684
02/06/19 6:30 pm
02/06/19 6:30 pm
Joined: Aug 2001
Posts: 72
VA USA
C
Chopper Rob Offline OP
BritBike Forum member
Chopper Rob  Offline OP
BritBike Forum member
C

Joined: Aug 2001
Posts: 72
VA USA
Hello All,

So here is the latest on the 56 G3. After draining the sump and getting her running I waited patiently for the oil flow to come back to the tank (ive read it can be several minutes) but after running the bike for a short while it began to spit oil out the breather again. I checked the tank and still no oil return so I shut her down to investigate further. I checked the return line for any air leaks and did the same for both oil pump end caps. I removed the guide screw and made sure the hollow pin was inserted the right way. The pin was pretty stuck in the guide screw so i cleaned it up a bit so it could move more freely. I removed the front end cap (feed to rockers) it did weep some oil so I knew it made it that far. Then I kicked the bike over with one hand and I could feel the plunger moving up and down with the other, but when I put my fingers over the holes for the feed and return lines i feel nothing. I understand these pumps push oil like old ladies push boulders, but if there is anything else I should check or investigate before putting her back together and starting her up I would love to hear.

As always thanks in advance for any and all assistance,
-Rob

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Re: G3 No oil return and wet sumping at the same time? [Re: Chopper Rob] #764721
02/07/19 2:38 am
02/07/19 2:38 am
Joined: Aug 2014
Posts: 1,850
OZ
Triless Offline
BritBike Forum member
Triless  Offline
BritBike Forum member

Joined: Aug 2014
Posts: 1,850
OZ
Possibly blockage in the crankcase / pump return gallery ! Also, check gasket integrity of the rear oil pump housing plate . Just a couple of thoughts !

Re: G3 No oil return and wet sumping at the same time? [Re: Triless] #764842
02/08/19 3:33 pm
02/08/19 3:33 pm
Joined: Aug 2001
Posts: 72
VA USA
C
Chopper Rob Offline OP
BritBike Forum member
Chopper Rob  Offline OP
BritBike Forum member
C

Joined: Aug 2001
Posts: 72
VA USA
Thanks! Gasket is good and plate is snug. Any advice best practices for checking blockages in these engines?

Thanks again,
Rob

Re: G3 No oil return and wet sumping at the same time? [Re: Chopper Rob] #764897
02/09/19 12:49 am
02/09/19 12:49 am
Joined: Aug 2014
Posts: 1,850
OZ
Triless Offline
BritBike Forum member
Triless  Offline
BritBike Forum member

Joined: Aug 2014
Posts: 1,850
OZ
Rob, I'm not familiar with the Lightweight G3, but with my Model X, and the Heavyweight singles, access to the oil return gallery is available on removal of sump drain plug.
Remove oil pump and probe with thin wire, or apply compressed air. Clean out pump housing and pipe unions. The only other things I can think of, although these would be obvious, are worn pump and housing, or badly scored housing !


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