Find piece of a spring on sump plug magnet

[BuRP]

Just want to throw it out here, dunno these motors too well ....... can that spring perhaps come from an (old) oilfiter-bypass valve or similar?

 

[Smittie2]

Dont see any spring there, still looking through the drawings, I will know where every spring is in that motor at the end of the day

 

[Cracker]

There is a spring in the oil bypass/ pressure release valve but I seem to recall this is accessible from clutch side.

Another memory. Poor oil pressure could be fixed by stretching this spring. Not a great idea but maybe someone tried that and weakened the spring? Not sure the spring can escape the housing, though.

Poor oil pressure will also make clutch jerky on startup.

 

[Smittie2]

Yes, thats the spring I was talking about, struggling to load pictures from work (firewall). My clutch was just like that on start up, no other problem, the spring is held in place by an circlip and washer, so I am sure if 1 turn of bottom of spring broke, with time it will work itself out through that whole.
The question is if it is that, will it solve my oil leak? or does my theory not make sense?, that more oil is in the motor, that needs to be in oil tank.

 

[Cracker]

Hmm .....Let's see.

less spring = more oil being bypassed.
More oil in sump than scavenge pump can handle?
Surely, after time, oil tank would be empty and sump full.
I'm not sure if that can cause a leak up at the starter.

Maybe spring is a broken piece from a previous repair, not a spring that is in bike now.

 

[BuRP]

Maybe spring is a broken piece from a previous repair, not a spring that is in bike now.

Huh??????
At least it should be part of a spring-in-the-bike!

 

[Cracker]

I'm saying it could be part of a spring-not-in-the-bike

 

[BuRP]

-anymore.


We're saying the same thing then..... isn't langwich wonderful hmm?

 

[Cracker]

Language is great but I'd be a better help if I could see the enjin.

 

[teebag]

can't remember if it solved my search for the leak

But it felt soft to the touch and smelt like a fresh diaper

 

[Amsterdam]

There is a spring in the oil bypass/ pressure release valve but I seem to recall this is accessible from clutch side.

Another memory. Poor oil pressure could be fixed by stretching this spring. Not a great idea but maybe someone tried that and weakened the spring? Not sure the spring can escape the housing, though.

Poor oil pressure will also make clutch jerky on startup.

I don't think it could be that spring.



If that spring is too short then you will have a low oil pressure warning (at least while the bike is idling). Also, that spring can shorten a bit over time but can't see a piece of that breaking off and end up in the bottom of the engine. I would be looking at the back of the outer clutch hub. I have seen those springs broken before (not on a 990 specifically though).

 

[GeenSand]

The spring on the oil tank side is very weak. Just to prevent all the oil to run back into the engine when switched off. When running the pump sucks through that ball and spring setup.

 

[GeenSand]

Clutch basket springs are much thicker than the one you found. Pic from when i had mine repaired. Might be from the oil pressure release mechanism on the pump

 

[Smittie2]

I found the broken spring, it is the relieve on the pump spring, the free lenght of a new spring should be 42mm, this one is 35mm, with the broken piece it is not even 42mm, so there is another piece that broke off, if I recall I removed it on a prevouis oil change, looked like a shaving, the end of the spring should be flat, the broken piece does not have that, but it is definitely that spring, I am sure it will solve the oil leak as well, it make sense now.

Had never low oil pressure, not even on idle, that does not make sense. I will get a new spring and see, just so relieve to have found the problem, lekker kak job to strip that clutch basket off.

 

[Smittie2]

its that spring 41, on Amsterdams picture.

 

[Cracker]

Replace the whole oil pressure valve with the upgraded part.

 

[Kamanya]

Yep, I forgot about it, sounds like that spring...



The regulator has been upgraded. The old one you could get the spring out. The new one you can't, it's sealed in there...

Old



New




You don't need to take the engine out, just need to get in behind the clutch. Not that big of a job...

Replacing the oil pressure regulator.

I replaced my oil pressure regulator (OPR). I’ve had a really noisy bike since the day I got it. It is a 04 950 with 60 000k's on it. Recently I couldn’t find the oil I like – Castrol Power Synth 4T 10W50 so I put some Castrol Edge Fully synthetic 10W 60 in and the effect was huge. I can hear...

wilddog.net.za

 

[Smittie2]

Yes, my bike has got the upgraded one in, got it out already. Found a spring in Jo-burg, received it over the weekend, so now I still need to assemble.

Kamanya, you can get the spring out, very clever design, it has got an small slot on the inside, so you compress the spring and slide the washer out, that release the spring to slide out at the bottom. Also could not understand how the hell they got it in there, then saw the little slot on the inside. Will try and load a picture to show.

 

[Kamanya]

I found the broken spring, it is the relieve on the pump spring, the free lenght of a new spring should be 42mm, this one is 35mm, with the broken piece it is not even 42mm, so there is another piece that broke off, if I recall I removed it on a prevouis oil change, looked like a shaving, the end of the spring should be flat, the broken piece does not have that, but it is definitely that spring, I am sure it will solve the oil leak as well, it make sense now.

Had never low oil pressure, not even on idle, that does not make sense. I will get a new spring and see, just so relieve to have found the problem, lekker kak job to strip that clutch basket off.

The reason you have little need to worry...

Simply put, if you never saw your oil pressure light, then don't worry. The engine needs a minimum of pressure to operate safely, the pressure pump is capable of delivering far in excess of both volume and pressure than the engine needs. The relief valve blows off the excess. You got lucky that the spring had still enough oomph to keep the engine healthy. But had the spring not been able to, the oil light would have instantly come on.

The 2 pumps that provide oil pressure and scavenge the sump run on the same shaft, but the suction side scavenge one has a wider rotor and thus has more capacity potential. The oil pressure lubrication one can thus never out pump the suction scavenge side in volume. It's for this reason that the oil is aerated when it hits the header tank and the oil tank always experiences positive pressure - it is forced to suck a little crankcase air along with the oil as the demand will never be met by supply.

So why are there sometimes oil pressure issues? Well, besides a screwed relief valve, or catastrophic loss of oil, the single biggest culprit is the water pump bearing seal. It can start leaking through wear and once water gets into the oil, the paper oil filter starts to get water saturated, swells and the oil can't pass through thus starving the engine of oil. This filter is downstream of both the pump and relief valve. The oil pressure sensor sits, in terms of flow, behind the front cylinders head cams.

It is possible to suffer oil pressure issues on the rear head and not know about it from the oil pressure sensor, but there's not much that can go wrong after the filter.

 

[Kamanya]

I found the broken spring, it is the relieve on the pump spring, the free lenght of a new spring should be 42mm, this one is 35mm, with the broken piece it is not even 42mm, so there is another piece that broke off, if I recall I removed it on a prevouis oil change, looked like a shaving, the end of the spring should be flat, the broken piece does not have that, but it is definitely that spring, I am sure it will solve the oil leak as well, it make sense now.

Had never low oil pressure, not even on idle, that does not make sense. I will get a new spring and see, just so relieve to have found the problem, lekker kak job to strip that clutch basket off.

Also, that spring, once it broke off would have gone straight to the sump magnet through the over pressure passage. It went through no engine parts.

You're golden... hopefully