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Home > Help Needed / General Tech Chat > Oil on top of Pistons. Stuck oil rings?

Rammie2000

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belgium

So. My Traveler is nearly finished. Was testing the engine today but it seems An oilburner.
Pistons are clean zero to almost no pressure on the vent and it's not blocked( i can blow straight through it) edit: did notice quit some pressure comming from the valve cover when i unscrewed the Cap. . And sparkplugs are dry but bit dark.

Yet when a clean the oil from the Pistons start it up stop it one minuten later Running about 2500 rpm there is a pudle of oil on each piston.
Looked at the valve guide Rubbers but they look all good so where is it comming from?

Engine has been standing for a while.

So i was thinking stuk oil rings?

Is there a way of testing this without stripping the entire engine first?

Edited by Rammie2000 on 3rd Dec, 2018.

you can do anything if you set your mind to it...
i rather blow it up winning than keep it together losing.

finish date set for project 1... march 2018


TurboDave16V
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SouthPark, Colorado

So it literally has oil collecting in the crown of the piston? But isn’t burning it off? I’m confused.

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Rammie2000

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belgium

Yes. Was just as amazed. When clean it all out and start it up it begins tot smoke enormas. When i shut it down and look into the sparkplugholes i van see a fresh pudle of oil. ( In less than a minuten.)

you can do anything if you set your mind to it...
i rather blow it up winning than keep it together losing.

finish date set for project 1... march 2018


stevieturbo

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Northern Ireland

And under same circumstances, if you pull the intake off, there is no sign of oil whatsoever in there or on the intake valves ?

Breather system details ?

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will


Rammie2000

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belgium

Not yet taken the intake of. Ill go in with my camera tonight. Breather is standard foto a 1100. ( Just one on the tapet covers. Doesnt blow very much really. ( Very slight if you feel wel.
If i take of the Cap from the rocker housing i get allot of blow there.

Let of the oil yesterday and poured in some diesel at 8 pm yesterday evening. Set Every piston tot halfway and filled it to the top of the sparkplugholes. This mornig some was leaked out but not even a 3th of what is in.

you can do anything if you set your mind to it...
i rather blow it up winning than keep it together losing.

finish date set for project 1... march 2018


Rammie2000

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belgium

So in made this.
What in know now from putting 4 bar of pressure on each cilinder is that. If i donit on cilinder one i can see it leaking some air out of cilinder 4 ever so slightly.
Pressure on 2 i hear some air leaking into the inlet.
Pressure on 3 slight lost but undeturment where and probably just the tool because i can hear some air but the gauge stays on 4.
Cilinder 4 loses pressure straight down into the gearbox ( as expected since pressure on 1 made 4 blow a slight walm of air.

So Back to rings suspect.


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you can do anything if you set your mind to it...
i rather blow it up winning than keep it together losing.

finish date set for project 1... march 2018


Rammie2000

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1619 Posts
Member #: 10190
Post Whore

belgium

Intake check is for tomorrow. Waiting for a new connector for my endoscoop camera.

you can do anything if you set your mind to it...
i rather blow it up winning than keep it together losing.

finish date set for project 1... march 2018


Rammie2000

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Member #: 10190
Post Whore

belgium

Checked intake. No tracés of oil there. Did a second pressure test now after it been soaked with diesel. And blown dry. It holds pressure slightly better on most cilinders now.
4 is much better. As is 3 and 2 ( they still leak pressure but much less and they always Will leak some pressure ofcourse. . 1 still leaks the most air. Doesnt look as much changed there.

Filled them up with diesel again to see what happens Further.

you can do anything if you set your mind to it...
i rather blow it up winning than keep it together losing.

finish date set for project 1... march 2018


stevieturbo

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Northern Ireland

Really not following what filling them with diesel will achieve or prove ?

And I've never had an engine anywhere that was so bad, oil could get from crankcase into the cylinder...unless the piston was completely melted or holed. Even if there was no oil ring altogether, I still dont think it would be that bad.

Compression test ?

leakdown test ?

Are the pistons the right size for the bore ?

You definitely installed piston rings ? lol.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

Home > Help Needed / General Tech Chat > Oil on top of Pistons. Stuck oil rings?
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