little mayo in sump (pic)

[Chimp871]

Changed oil and sump gasket and found a bit of mayo in sump.
Couple of weeks ago the oil temp went high, stopped, waited, topped up water there and then. Has been behaving well (on cooling side, not oil side) since but now need to know whether this is condensation or something more serious.

Fwiw - had oil sensor !removed for a couple of days in cold weather.

Any opinions on if this ir acceptable or not beforr i start stripping down?

[Pupp]

Oil sensor? You mean the pressure sender or the switch? Either way, could be a potential point of ingress...
I've normally viewed Mayo as a problem on a Rv8, got any under the filler cap or in the breather?

[Chimp871]

... meant the oil sender. I'll check breather and cap tomorrow.

The block and camshaft didn't show signs of it. Is mayo only produced when oil/water are mixed heavily rather than with a little condensation ingress?

Rest of oil was normal black stuff.

[phazed]

Never seen that in a sump before.

Simon

[ClassiChimi]

^^^^^^ haha, do you know when the oil was last changed, could the car have been standing in a damp area for far to long or something,, Seems a bit naughty ! Leak between head gasket and water/oil Chanel maybe ?

[Sardonicus]

Short runs and over cooling (failed open thermostat) inc clogged crankcase breathers will all contribute to this that does not look like an abnormal amount of mayo in the oil for the above reasons and only so long as the engine oil dont look like chicken gravy too failed open thermostats can often happen after an overheat event too so worth checking and finding out where the lost coolant went

[Chimp871]

Oil was normal looking, no gravy signs. Took pics with sump off and from filler cap and expansion bottle.

Its was a quick increase and since behaved. Car is outside, didnt run for a month. No obvious signs of leaks and I've not put oil in, in case i want to pressure expansion tank (oil ain't cheap)

Some pics

[Chimp871]

Above pic had the faintest signs of moisture

Crank looked ok

[Chimp871]

ClassiChimi said:

^^^^^^ haha, do you know when the oil was last changed, could the car have been standing in a damp area for far to long or something,, Seems a bit naughty ! Leak between head gasket and water/oil Chanel maybe ?

About 5 months ago

[Chimp871]

Crank breather weepy, a little mayo perhaps but not a lot

[keith-vznby]

If this residue was left in the sump after draining the oil then it is obviously below the drain level and could have accumulated over a long period of short runs and had no real way of escape other than by hot oil evapouration.Clean all of the breather pipes and watch the oil pressure the pressure will tell u what the engine condition is from a mechanical point of view cheers Keith

[Chimp871]

Hooked up airline to swirl pot at 15 psi and there's definitely a leak somewhere under the plenum went to zero after 10 seconds..

head, intake or block. Any ideas?

[phazed]

Head gasket, dropped liner?

[jimed]

Not sure here but presumably pressurising the plenum would also go via the engine and any slightly open valves (would have thought there would be one ot two in whatever position the engine had stopped at - or does it stop with all closed ...?) so could even be seeing leaks in vacuum pipes or round piston rings so it might not be quite as dramatic? I assume that any drop in the liners would be visible from underneath when the sump is off as well? Not much help in diagnosing but a thought.
Jim

[Sardonicus]

Make sure the waterway cut outs in the intake manifold gasket have not breached those black coated intake gaskets dont last forever that coating cracks and break away with age, this will seep coolant into the valley/camshaft area, you will have to remove the intake man to check of course

Edited by Sardonicus on Thursday 28th January 11:23

[Chimp871]

Sardonicus said:

Make sure the waterway cut outs in the intake manifold gasket have not breached those black coated intake gaskets dont last forever that coating cracks and break away with age, this will seep coolant into the valley/camshaft area, you will have to remove the intake man to check of course

Edited by Sardonicus on Thursday 28th January 11:23

Thanks,this helps. Took off plenum and trumpet, attached air again and air is definitely coming from front of engine, somewhere near the where you marked Sardonicus and quite loud. Didn't take off intake as i didn't have valley replacement.

Anyway, added water to help see water escape route, pressurised again and no leaks and held 14psi for 2 hours dropping to 13 psi after 4.

Don't know what happened here and don't like it. Why did the water create a seal?