SFC/RGS Oil Pump replacement maybe.

K

Keith

New member
I've taken the primary cover off my SFC 1000 to replace a couple of oil seals, and to have a look and see if I can see anything untoward in there.
Just over the last couple of hundred K's or so I've noticed a noise coming from near the front of the primary cover so I thought it was worth a look to see if there's anything obvious. The noise - well hard to describe really, a slightly high pitched whirr or squeal maybe............??? (dunno). Sounds like primary chain, I know.
Anyway the primary chain is fairly new, as is the clutch basket and rubbers, they've all got about 5 - 6000 k's on them. I think the Primary chain is adjusted ok - take it to about 3000rpm, adjust until it squeals then back it off? Can't say that this method actually gives me alot of confidence though!
So I was thinking the oil pump maybe? Last time I checked there was still plenty of oil getting thrown up to the top of the motor (probably would have seized by now if it hadn't been!!!).
The question is, should I just go ahead and replace the oil pump anyway as it doesn't look too difficult - or is it fraught with danger.............or should I just leave the pump, close it up and try adjusting the chain again?
Any thoughts?
Cheers,
Keith.
 
I would adjust the primary chain.

From a really good source:

Cold engine.
Unlock adjuster lock nut.
Adjust primary chain tensioner up until it stops (don't force it).
Back off 1 1/2 turns.
Lock adjuster up with lock nut.
Job done!
 
Oil pumps in the twins and triples rarely give cause for concern.  They can be seriously damaged by metal bits passing through the engine after a blow-up, but not much else.  Set-up upon installation is crucial, the body isn't located by pins or dowels so the pump needs to be checked for free and easy rotation when tightening the body to the crankcase.

Back off the tensioner to see if the noise changes or goes away.  A new chain will require adjustment after only a short period, it will then settle and remain fairly constant for most of the rest of its service life.  Tensioner should NOT be tightened till the chain squeals, a whirring noise is enough to indicate the chain is too tight.

Check the gearbox mainshaft and outrigger needle bearing, a bent mainshaft will destroy the outrigger bearing while it chews itself up in the process.

The outer crank bearing can cause noises if the crank shows excessive run-out. 

piet
 
Thanks guys,
Yes I tend to agree Piet about the pumps not really giving cause for concern. I did trawl the forum to find something but nothing that suggested they give any problems.
I didn't really want to go to the trouble of pulling everything apart anyway, so I think my minds made up (although I'll wait a few days and see what, if any other answers turn up),I'll reassemble and adjust as you described Simon.
Cheers,
Keith.
 
SimonR501 said:
From a really good source:

Cold engine.
Adjust primary chain tensioner up until it stops (don't force it).
Back off 1 1/2 turns.
Lock adjuster up with lock nut.
Job done!
Click to expand...
Really?! 1 1/2 turns sounds like a lot to me (depending on how tight 'don't force it' is) - but happy to be wrong  :D
 
Piranha Brother 2 said:
Really?! 1 1/2 turns sounds like a lot to me (depending on how tight 'don't force it' is) - but happy to be wrong  :D
Click to expand...

Yes! Really.

If you look at this thread there is a range of 3/4 to 2 turns out:
http://www.laverdaforum.com/forum/index.php/topic,91849.0.html

My source for 1 1/2 turns is from an extremely well respected member.
 
Don't forget to oil your hand before using the screw driver,that helps with not overtightening, from the same source.
 
SimonR501 said:
Yes! Really.

If you look at this thread there is a range of 3/4 to 2 turns out:
http://www.laverdaforum.com/forum/index.php/topic,91849.0.html

My source for 1 1/2 turns is from an extremely well respected member.
Click to expand...

A mechanic?
 
'A mechanic?'

He's Scottish, not sure if he is a mechanic.
I believe he trained as an Instrument Technician, but branched out to more butch things.

By the way my 'Quote' button is busted.
 
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