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No oil pressure after overhaul

  • Thread starter Thread starter arve
  • Start date Start date
A

arve

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Ive recently aquired a GS 1000,chain driven one,but there is a little problem that came with it: The previous owner had the engine overhauled and rebored,but afterwards there was no oil pressure.I started the engine without the pressure switch to see if any oil came out,but there was none.The engine seems to run fine,except when revs dropped too low,as i turned the choke off,(needless to say it isnt very wise to run an engine with no oil pressure until its hot..)there was a knocking sound.Ive heard this sound before,it often occurs on my 550 and on many other motorcycles at too low rpm when cold,but the noise isnt nearly as sharp.Over abt 1000-1500 rpms it runs fine and smooth without any knocking,but there are small detonations in the exhaust.Maybe the power filters and supertrapp cans have something to do with this,as well as no choke at cold engine.But the sound made me think of sparks from oil-starved piston rings igniting unburnt fuel in the exhaust...What do you think?

Arve
 
What I think is quit running it until you fix the oil pressure.
It's a simple system, figure out why it's not working.
 
Like they said, don't take a chance on ruining a head. I'd think get a guage hooked up to see there is no pressure, they don't call those lights idiot lights for nothing. Those bikes run very low oil pressure 4 or 5 psi I think. Just my opinion
 
no oil pressure

no oil pressure

do a compression test . I would start there to see if the rings are bad. If not u may have a bad oil pump.
 
Check the oil pump drive gear that comes off the clutch basket. I did an engine but forgot this part and got no pressure.
 
Pull the clutch basket and see if the oil pump gear is mating with it to turn the pump. If it is replace the pump.
Not a hard job. Just do it.
 
Oil???? What is that for? :confused:

I had this black crap kept getting on the floor; Found out where it was coming from so I drained it all and threw it out. :rolleyes:

Floor is spotless now. :p

I need to run and do a post now cause I keep hearing this knock knock knokc. :-&
 
No oil pressure after rebuild? Just turn the engine over with the kick starter to check why there isnt any. :^o
 
I 2nd not running the engine with no oil pressure. I can't even contemplate how someone who wrenches or wants to wrench can do such a thing for longer than it takes to see the lack of oil pressure and hit the kill switch.

Running it without oil and seeing how it runs will only leave you with more to fix than before you "checked things out"
 
I found it. ;)The gear on the pump had loosened from the axle and was rotating freely. The little seeger ring at the axle end had snapped off,the axle had sunk inwards and stuck the locking pin in the pump housing,which in turn had forced the gear outward,causing it to collide with the damper springs at the back of the clutch basket,so 4 of the 6 has been gnawed away... :eek:I made a new locking pin of a screw and welded the gear to the axle to cure the problem once and for all,if the pump goes bad again Ill buy a new one.:DBut now I have a problem with my clutch basket: The two remaining damper springs will probably not keep up with the pressure when the going gets tough,so what do I do? It can probably be repaired,but I will need new springs as well as the plate that keeps them in place,and I must have a professional to rivet it all in place again. Probably just as well to get a used clutch basket right away. Or another option I came to think about: What if I just welded the primary gear directly to the retaining plate?:DThere will be no dampening,but whats the difference? I welded the pump gear,and it looks like it will work out fine. What do you think?
 
How about u walk away from that engine and leave it to someone with mechanical sympathy. You have been given advice and havent taken it. 2nd thoughts go ahead and completely stuff that bike. See if i care
 
Last edited:
Hey,"sharpy",what advice have I not taken?:mad: The parts are shot anyway,so they will have to be replaced all the same if I cant help it with alittle redneck repairing.:p Besides,I like the thought: "I fixed the bike and it didnt cost me a dime.":D Any serious contributors here?:-s
 
I under stand the need to repair a bike on the cheap and get it running. Going the way that you want to make sure that the new pin works and doesn't fail.

Best suggestion would be to get a second hand pump and do the job properly to save problems later.

It would be a good idea to remove the sump and clean the strainer out also.
 
Those chain drive 1000 clutch baskets are known to develop play in the springs which leads to rattling. You can get a heavy duty backplate and spring kit for about $150 from various sources. It's a fairly simple matter to grind off the rivet heads and install the new parts before welding the assembly together. Try the advanced search function, you will turn up lots of info.
 
Did you check if the little o-ring that fits between the crankcase halves is there? If the PO left it out guess what, the service manuals makes a special point relating to installing it.
 
posplayr said:
Oil???? What is that for? :confused:

I had this black crap kept getting on the floor; Found out where it was coming from so I drained it all and threw it out. :rolleyes:

Floor is spotless now. :p

I need to run and do a post now cause I keep hearing this knock knock knokc. :-&
Click to expand...
You funny guy
I kill you last

See if you can find a used clutch basket on Ebay or do as Ed says to do with a new backing plate being riveted.
Do you have oil pressure now and do you think it will hold up for any amount of time?
 
There is a bike breaker nearby who primarily aims at big old jap bikes,so used parts should not be any problem. http://www.krangnesmotor.no/ ;)The groove for the retaining ring on the pump axle is so small that it easily could fall off again,was my thought. With the gear welded to the axle the problem is solved once and for all,if the weld doesnt break.:rolleyes: Which it shouldnt.Only down side is the pump can never be dismantled again,but why should it be necessary?If its broke,its broke and then you buy a new one.Simple as that.I dont know if there is any oil pressure now,as I havent installed the parts yet,waiting for your good advice on the clutch basket. Seriously,it must do the job to weld it,providing the welds dont break? And if they dont,not much can happen besides that my bike stops?:-k About the o-ring in the crankase,I sincerely hope its there..but if its not,is it possible to install it with the engine still in the frame? Thanks for all good advices.
Arve :cool:
 
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