G80 oil pump

merv239 · Post by **merv239** » Wed Aug 15, 2012 12:55 am

Hey there, I seem to have a problem with the oil pump on my 1961 G80. It is filling the sump and not returning the oil. Is there a number of things can be wrong here?

wilko · Post by **wilko** » Wed Aug 15, 2012 2:00 am

Don Madden · Post by **Don Madden** » Wed Aug 15, 2012 2:02 am

Posibilities are air leak at rear pump cover plate & obstruction in convoluted return oil drillings. Cheers, Don.

en7jos · Post by **en7jos** » Wed Aug 15, 2012 3:20 am

Hi Mervyn, welcome to the forum.

Right, get yourself a cup of tea, make your self comfortable and get ready for a good few hours of reading! You'll find lots of suggestions, possibilties, tips and clues in the forum archive, in addition to the suggestions Don made above.

Click on "Forum" >> "Search" in the headings across the top of the page, or click here. Try searching for something like 'oil pump' and it will bring up many threads for you to sift through. Because of the many possibilities you'll probably need to do some investigating and provide a little more info before anyone can offer any real suggestions here.

Keep us posted how you get on, good luck!

James

merv239 · Post by **merv239** » Wed Aug 15, 2012 11:38 am

Thanks lads! Will do a bit more research both on the forum and with the bike. Just wanted to ask incase it might of been a common problem. Thanks again.

SPRIDDLER · Post by **SPRIDDLER** » Wed Aug 15, 2012 3:51 pm

Welcome Mervyn.
It would help to know how long you've had the bike, whether the oil's ever been returning o.k. or whether the problem has only just arisen.
What tells you the oil's not returning? It may be what's known as 'Wet sumping' which is covered in topics available if you use the 'Forums' 'Search Forums' facility.
Had you done anything to the engine/oil tank/pipes/filter etc. immediately beforehand?
If you're that way inclined, here is a graphic showing how the oil system and pump works:
http://members.ziggo.nl/fxkuyl/plaatjes/pompklaar.gif

rex.webb · Post by **rex.webb** » Wed Aug 15, 2012 10:51 pm

Hours of FUN ? Watching this PUMPING !!!!!

merv239 · Post by **merv239** » Thu Aug 16, 2012 7:28 pm

Well I stripped the pump out last night and felt a slight blockage in the return pipe from the sump, the pump looks grand and there is no sign of air or oil escaping from the cap at the return end of the pump, so I gave it all a good clean out with brake cleaner and air and fingers crossed it will have relieved the problem. I have had the bike for around 6 months and my first vintage bike of my own. It only started to wer sump the other night that I know of, but so extreme of the non return of oil was that oil was coming from everywhere it could escape. I am no motorbike mechanic but have had modern bikes since no age. Mxer

merv239 · Post by **merv239** » Fri Aug 17, 2012 12:29 am

Got the old lady back together and she is returning oil a treat! Thank goodness as we set off for the Irish rally in Killarney on Sunday! Didn't fancy stripping her to the bone before Sunday! Thanks for everyone's comments and help. I will have to post some pics at some point, as we have a couple of interesting bikes gathered up ie. a Cheney triumph prepared by and for bud ekin and a drino miller built/ modified g80 matchless. (goes like the clappers). Thanks again!

MikeM. · Post by **MikeM.** » Fri Aug 17, 2012 1:00 am

Look out for Luky on her Model 16 while you are there