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Post by malakiblunt on May 29, 2008 4:14:52 GMT -5
i think my pump isnt scavengeing, could this be becuase i did not bleed it properly?
i strted the engine with the bleed screww out and stoped it as soon s oil came out,
it didnt squirt just flowed out over the engine.
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Post by davedunsboro on May 29, 2008 6:15:39 GMT -5
I recon it would have squirted if you reved it ! The SR engine usually primes up OK & all you usually do is crack the bleed screw to let the air out of your filter , then you close it off & all is good cheers Dave.
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Post by StewRoss on May 29, 2008 6:40:54 GMT -5
Heh, heh...unless you inadvertantly undo the screw too far! Oil everywhere! I loosen the screw and then undo it with the engine idling until the air comes out...then screw it straight back in before it gets too messy...well usually... SR  |
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Post by malakiblunt on May 29, 2008 7:26:43 GMT -5
oh i actually took the screw out, and like a say it defintly wasnt squirting but plenty of oil came out.
any other ideas that would stop the pump scavenging?
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Post by colinjay on May 29, 2008 17:34:50 GMT -5
You have to remember that these engines have a low pressure lubrication system (high flow) about 7 to 9psi, so you will not get a spurt of oil like you will with a high pressure system when you bleed the oil filter.
What makes you think the scavange side of the pump is not operation correctly?
Are you getting oil returned back to the tank?
DO you have the correct oil level read on the dip stick with the correct amount of oil in the engine?
If you have the correct amount of oil in the engine, and it is returning to the tank you should get a reading near the full mark on the dip stick after the engine has been idling for a couple of minutes after you stop the engine. If this is the case and the oil level drops down after the engine has sat with out running for a while, then you could have a check valve (fitted in the clutch cover) leaking, allowing the engine to wet sump, with the oil draining from the tank down to the engine.
If the oil isn't returning to the oil tank there are two most likely problems;
1. the easy one too check, a blockage in the oil pick-up in the sump. Remove the sump plate and have a look for any crap that mignt be in there and clean it out.
2. The difficult one, which is that the scavenge rotors in the oil pump are worn/scored. Too check this requireds the clutch to be removed to let you pull the oil pump.
CJ
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Post by davewfc603 on May 29, 2008 18:49:51 GMT -5
I'm learning from everyone on this one. Thanks once agin sr folks
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Post by malakiblunt on May 30, 2008 5:50:56 GMT -5
Hi CJ
Yes i think that the oil is not returning to the tank, ive cleaned the sump plate when i had the engine out.
which leaves cheaking the pump.
is ther anyway to refurbish the pump if it is scored /worn or will i need a new one?
thanks for the help.
just rebled the pum lots of oil came out,
i drained the sump and poured it back inot the tank and it stayed in ther for 48 hours, but as soon as the engine runs it drops and then afte a minute or so the smoke and revs riseing, wich im assumeing now is the engine disiling on the oil pushed past the rings, thers so much it runs out of the exhuast port.
but its defintly not getting back to the tank
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Post by davedunsboro on May 30, 2008 7:09:11 GMT -5
Forget what I said you've got something serious going on there . Filter is wrong(maybe wrong way round),oil pump is cactus or not driving properly or a serious blockage or something hasn't been put back correctly. You've got hydraulicing happening too thats why its pumping past the rings as the piston goes down its trying to compress the oil in the engine .My bikes oil level is always OK but I will scrutinise it a bit more next time I run it cheers Dave.
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Post by chew652 on May 30, 2008 8:11:11 GMT -5
Dumb question here. Did you change the right side crankcase cover(Clutch cover) or the seals inside it? There are some differences between the later and older model covers that can cause oiling /oil pressure problems.
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Post by malakiblunt on May 30, 2008 8:55:05 GMT -5
Hi Dave well its nothing i did striping down the engine as this is why i striped it down in the first place. it realy is looking like its the pump, the oil was very dirty, though ther wasnt anything nasty caught in either of the mesh traps.
i geuss im just going to have to bite the bullit and take the pump out for a look.
No Chew ive not had the clutch cover off.
ho hum,.
thanks again for the help
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Post by davewfc603 on May 30, 2008 13:36:09 GMT -5
So, 14 days ago when I tried starting this very abused XT & it kicked back so incredibly hard (pressure bound?)my ankle is torn up & I've been looking at my bikes limping & learning about this wet sump/oil issue. I played with it a few times. I cranked the bike by hand, the oil breather sounded like bubbling oil & I think pressure. The next morning I went out & oil was all over the ground & still coming from the oil breather & the seal around the kick starter. I drained the oil there was about 3 quarts in it. I can still hear a little gurgling but I'm learning from all the current discussions. Malakiblunt, you will be one of the masters for information when I have the courage to kick that bike again. It driving me a little nuts not going out & just tearing the thing apart, Dave
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Post by malakiblunt on May 30, 2008 14:10:02 GMT -5
sorry to here about your ankle Dave.
LoL i keep re reading Zen and the art of motorcycle maintanece, the chapter on Gumption Traps. all thiose things that make your heart sink, and want to give up on working on bikes!.
Well ive drained the oil and am going to take the pump out and see what shape its in
ill cheak the oil lines first just incase ther blocked though i cant imagine how.
depresingly i cant find any spare parts for oil pumps.
ill keep you posted
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Post by malakiblunt on May 30, 2008 14:38:43 GMT -5
well now im a bit confused, i took the oil return pipe of at the tank, and just turned the engine over on the kicker, and oil was welling up out of the pipe, so surely if its pumping by hand it must be working whjen its going at 1000+ rpm???
wich would strongly sugest ther is a blockage in the feed to the scavenge pump?
as CJ sugests ill whip of the panand cheak the pick up again but i did give it a thourgh degressing,
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Post by chew652 on May 30, 2008 15:31:15 GMT -5
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Post by malakiblunt on May 30, 2008 16:50:39 GMT -5
thanks chew. im in the UK but they ship overseas so that is an option, all a bit of a night mare though as i want to be rideing not waiting for the mail man!  cheaked the pan and its clear so im a bit miistified, im tempted to pulg the oil return in the tank and start the engine just to see if oil comes out the return pipe. |
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