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Author Topic: Oil leak  (Read 7109 times)

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TheBoy

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Oil leak
« on: 23 February 2013, 10:48:04 »
Silver Bullet still has one. Buggered if I can find it. Its had one for maybe 2-3 yrs.

To resolve:
I've changed rocker gaskets, no change (old ones still soft).
Front crank seal (in desperation)
Resealed upper and lower sumps
Valley looks clear (when I did rocker gaskets)
Obviously, its had many oil/filter changes.

I cannot locate it.
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Steve B

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Re: Oil leak
« Reply #1 on: 23 February 2013, 11:21:28 »
looks like your going to have to break it then  :D :D :D :D :D :D :D :D
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symes

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Re: Oil leak
« Reply #2 on: 23 February 2013, 11:49:11 »
check cam seals and banjo seals to cooler  :y
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TheBoy

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Re: Oil leak
« Reply #3 on: 23 February 2013, 12:11:39 »
Quote from: symes on 23 February 2013, 11:49:11
check cam seals and banjo seals to cooler  :y
Cam seals are fine.

As said in OP, no oil in valley when I changed cam covers a couple of years back (to cure this leak).
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TheBoy

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Re: Oil leak
« Reply #4 on: 23 February 2013, 12:12:40 »
God, just had a moment of doubt then, thinking I'd only checked the front ones.

Then I realised what a plonker I was being ;D. Doh!
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Andy H

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Re: Oil leak
« Reply #5 on: 23 February 2013, 13:30:53 »
Rear crank seal?

The cylinder head gaskets never leak oil..................

Oil level sensor plug? The design of the seal is a bit crap if IRCC.

Old dried oil sitting on the outside of the engine? becomes viscous again when hot?
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YZ250

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Re: Oil leak
« Reply #6 on: 23 February 2013, 14:04:01 »
Is there a general area to narrow it down?  :-\

Seem to recall it was dipstick tube area ( reference 'O' Rings query) so presuming it's more to the front of the engine.  :-\
As you've checked the most likely culprits, could Camshaft seals be a possibility  :-\ (not the camshaft cover half moon, but the end seal itself ). 
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Re: Oil leak
« Reply #7 on: 23 February 2013, 14:07:33 »
I seems to sit on top of sump pan.

Well, its everywhere, from undertray back ;D

But I think its on top of sump pan.

Tried cleaning it up, then seeing, but proven unsuccessful so far...
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Andy H

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Re: Oil leak
« Reply #8 on: 23 February 2013, 14:32:44 »
Quote from: TheBoy on 23 February 2013, 14:07:33
I seems to sit on top of sump pan.

Well, its everywhere, from undertray back ;D

But I think its on top of sump pan.

Tried cleaning it up, then seeing, but proven unsuccessful so far...
Level sensor plug is a push fit through a hole in the top of the sump pan. On one side there is a rubber washer, on the other there is a circlip. It relies on the rubber washer being the right thickness, and having enough elasticity, to give an oil tight seal.
Crap design, pretty much guaranteed to leak when the rubber ages IMO.
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Kevin Wood

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Re: Oil leak
« Reply #9 on: 23 February 2013, 15:24:36 »
That's the integrated rust-proofing system, isn't it? ;D

So, is it appearing on the lip of the sump at the front of the engine?

Could be oil pressure sensor or perhaps block-to-oil pump seal? Upper sump to block seal?

I think the trick would be to thoroughly degrease the area where it's visible then sprinkle it with talc or flour or something and see if you can spot the direction from which it starts to emerge.
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Re: Oil leak
« Reply #10 on: 23 February 2013, 16:22:50 »
Pressure washer, engine degreaser spray, brake cleaner, compressed air.
It is smarter to spend a few hours, diagnosing leak, than replacing parts. Remove some parts, if you cannot see leak.
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Re: Oil leak
« Reply #11 on: 23 February 2013, 16:27:50 »
I've tried the cleaning and waiting for it to reappear, unsuccessfully so far.  I have a feeling its pooling somewhere, and the first bit of spirited driving, it just appears everywhere.

DLK and I were convinced it was coming from the upper sump to block seal, so we resealled all of that last summer.
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TheBoy

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Re: Oil leak
« Reply #12 on: 23 February 2013, 16:28:57 »
Oil pressure sensor did have a weep at one point, but washer replaced, and thats oil tight.
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symes

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Re: Oil leak
« Reply #13 on: 23 February 2013, 17:46:01 »
when cam seals leak it runs behind cover onto sump=dont dismiss those seals-I did mate TBH reckon those things are the fault IMHO :y
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Re: Oil leak
« Reply #14 on: 23 February 2013, 18:01:51 »
Quote from: symes on 23 February 2013, 17:46:01
when cam seals leak it runs behind cover onto sump=dont dismiss those seals-I did mate TBH reckon those things are the fault IMHO :y
Virtually always the seals on the exhaust cams that fail. No idea why.
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