Mayo in my engine

[HandyAndy]

Need some advice please guys............

My engine ( 1.8CVH ) has started getting mayo in the oil, & I don,t know why as nothing has changed recently with the engine :confused:

The engine came from my donor which has a genuine 92k on the clock backed up with FSH & old MOT certs, when I installed the engine because it was running so well in the Sierra all I did to it was fit new plugs, new oil (good stuff), new inlet & exhaust gaskets, a new sump gasket purely cos I,ve fitted a shortened sump so fitted new gasket.
The only real engine work I,ve done is fitted new cam followers( all of them) as 1 of them was rattling too much.

The coolant system has new stat, new hoses & a new Rad & i,m not losing any coolant at all,
It gets up to temp nicely & the rad fan kicks in as it should.

I,ve put the correct quantity of oil in as per the Haynes manual as even tho the sump is shortened it also has a "wing" extension so I presume the sump capacity is as per standard.

So, why am I getting Mayo ) :confused:

This car is determined to live a cosy life just living in the garage :mad:

cheers in advance

Andy

[flyerncle]

Emulsified oil is common in cars that only do short journeys,usually looks like salad cream in the fill cap.

Once it gets a good run flush it and change the oil,older engines ran on 20/50 with not too many detergents in and new spec oils can cause bother .

[mark]

Is the mayo under the filler cap or on the dipstick?

Sometimes you can get a bit of condensation in the top of the rocker cover and get some residue under the cap, had it on both cars i have had with cvh engines

If its in the oil in the sump and on the dipstick etc it could be bad news

Best get the coolant sniffed and you will know for sure straight away

[HandyAndy]

Crikey :eek: that was quick .

The mayo is just in the rocker cover, tho being honest, quite alot of it ( well i think its alot :o )

There is no mayo in the oil from the dipstick, in fact I dropped all the oil out yesterday as I wanted to check the oil in the sump whilst cold, ok ok the oil wasn,t as clean as it was when it went in but no mayo in the oil.

I run the engine up now & again, tho not for long as I,m being considerate to the neighbours etc & plus I can,t take it for a drive yet ( not IVA,d yet).

Do you think with the increase in general temperture as the weather is getting warmer & me just running the engine to the point where its only "just" getting to the point of needing the rad fan then switching off it maybe creating this condensation inside the engine? :confused:

cheers
andy

[flyerncle]

Duckhams 20/50 was gods gift Adrian (back in the dark ages);)

One other thing Andy,if the breather system is not conected to the carb/intake system it has nowhere to go other than stay inside and condense.

[mark]

Duckhams 20/50 was gods gift Adrian (back in the dark ages);)

One other thing Andy,if the breather system is not conected to the carb/intake system it has nowhere to go other than stay inside and condense.

Sounds like the answer to me, none in the sump or on the dipstick & he does have a catch tank on the breather system not connected to the intake

Sigh of relief time Handy :D

[HandyAndy]

Sigh of relief time Handy

Does this mean I can stop panicking now ? :confused:

will a good run clear it up? sounds like a track day is needed :D wonder if I could borrow spud with his tow car & trailer :D

Yes, I do have a catch tank thats connected to the rocker cover but there is no water/condensation or mayo in the catch tank :confused:

cheers
andy

[flyerncle]

Makes sense Mark,had a conversation with Spud about PCV valves in Zetec's and with a normal sump you get plenty of oil mist chucked about in the roadster if used in anger with the shortened sump and the guts of the PCV still in place,he has no return to the intake either and removed the valve spring and plate and vents to catch tank,he has also replaced the sump with a super dooper one.

Could also be a part of Andys problem so worth taking a look at.

[flyerncle]

" CRANKCASE VENTILATION "!!!!:rolleyes:

[HandyAndy]

" CRANKCASE VENTILATION "!!!!

Yes, got that too :p

Well......the crankcase is vented into the rocker cover then this is vented to the catch tank...is that ok?

or should I vent the crankcase directly to the catch tank too?

:o
Thanks for your help guys :cool:

cheers
andy

[flyerncle]

Vent it to the tank as it may well just curculate and not vent and make sure the tank vents to air as well or fit a vent to the block with some sort of filter.

[HandyAndy]

Vent it to the tank as it may well just curculate and not vent and make sure the tank vents to air as well or fit a vent to the block with some sort of filter.

Ok, I,ll try that then, I,ll put the crankcase vent direct to the catch tank ( well, I,ll "T" it into the hose going into the catch tank).

To be honest, I,ve never had ANY residue in the catch tank & thought this to be odd, no water/condensation or oil mist, but then again the engine hasn,t been run for long or in anger.

The catch tank does have a filter on the outlet point to fresh air .

cheers
andy

[AshG]

i wouldnt worry about it. my pinto did the same thing and it had a full rebuild. its just condensation build up from running it up then letting it cool without going anywhere. as soon as you drive it the problem will go away.

andy stop thinking into things too much bite the bullet get it in for iva and fix the list of things it fails on. you will make yourself feel bad aiming for a first time pass. your better off spending the £90 on the retest just to relieve the pressure

[tex]

yea as above andy - the oil in the sump/crankcase gives off vapours when warm / hot - it has to be vented. along with vapours from the top end [under the cam cover] usually to a oil catch tank in the kit car world. the OE way was to vent it back into the air intake tract to be reburnt. if its not getting vented it just sits on the oil and eventually goes white. also when fitting vent hoses make sure ALL hoses have only an up down fitment so gasses will rise up inside them. the tank should be at the highest point so any oil that does make it there can drain back down to the sump once the engine stops.. if poss..

get it finished man.. thats 2 stoneleighs youv missed.. :p

are you going andy? if so we iz going down prob saturday night or sunday morning.. maybe the latter weather dependant

[flyerncle]

Good job its not on gas,it turns oil to milk and there is nothing you can do with it.

[twinturbo]

pull a top breather off any late 80's early 90's VW 1.8/2.0 and you will understand how blocked arteries restrict flow of blood. These gum up with horrid emulsifed oil..

TT

[baz-r]

andy as your engine warms up the hydrocarborns mix wit the oxygen in a diffrent ratio or ballance creating more h2o (water) that blows down the bores into the crankcase more ware, more blow by, more water in the crank case = more mayo
when a engine is used more it heats up nad the water is turned to vapor and expelled via the crankcase breather.
the problem is the crusty desposits that are created by the mayo gets into the oil pickup and colgs it over time.
this was typical of 80's engines that was over come with thinner oils of better quality and tighter running clearinces of more modern engines and fuel mixture control systems

hope that helps