oil leak
Turbo Mini Forums

Hi all

got problem with oil leak between block and head

head and block skimmed; commetic headgasket ,arp 11 stud head bolts
engine run for about 100 miles..
everything new and now ther is a little oil loss at the head gasket

(commetic head gasket shouldnt have to be retorqued)

advice is welcome

Rob

what surfave finish are you running, cometics should be run on a surface ground block and head IIRC,

Oil leak from the head? Where exactly?

There is only one oil seal in the head where the oil feeds the rockers- at the rear on the thermostat end.

Is it actually the rocker box gasket?

Edited by wil_h on 10th Nov, 2015.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

most of the oil is at the back of the block...entire lenght

Nope its not the rockerbox thats leaking its defenately the head gasket

@joe C what exactly do you mean with that....???

I bet it's not.

I've been confused by this many times. If it's right across the back it's almost definitely the rocker gasket.

It's just not possible (well I've never seen it) for it to be from the head gasket, it's not really an oil gasket.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

nope def not....using a silicon rockercover gasket and is dry

comes from headgasket javascript:void(0)

Edited by clubbie70 on 10th Nov, 2015.

..

Edited by clubbie70 on 10th Nov, 2015.

with the steel gaskets, if you have a slightly rough finish for example from milling, they can weep.

just checked and they recomend 50 RA or smoother...

http://www.cometic.com/technical.aspx

milling can be this good, bit sometimes isnt, a surface grind will ensure it is.

There are many porous cork rocker gaskets on the market, had this myselfe and a know a few people who have had the same, minispares do a rubber rocker gasket, fit that and its sorted rob

Would this really affect the oil seal between the head and block?

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

https://picasaweb.google.com/lh/photo/68KX7...feat=directlink



some pics ....oil leak

Edited by clubbie70 on 11th Nov, 2015.

There is plenty of oil above the head/block join; even around the manifold flange.

Looks like its coming from above the head join.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

https://picasaweb.google.com/lh/photo/94eZ_...feat=directlink


not trying to be right in any way . Infact i would be happy to be wrong

Edited by clubbie70 on 11th Nov, 2015.

ok, interesting

What does the manifold gasket look like?

Is there oil in the exhaust manifold?

I's obviously coming from somewhere. I just can't see it's from the head gasket.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

https://picasaweb.google.com/lh/photo/94eZ_...feat=directlink

no oil in the manifold
manifold gasket had some leakage on the exhaust ports

I once took and engine out for a bad oil leak in that area and it turned out to be the rocker box gasket !!

Its not necessarily leaking from directly above where you see it - oil could be leaking at one side, or even the front, and tracking round (especially once its in that nice gap between head and block for capillary action to take place)

Are you absolutely sure it is oil and not Coolant?

The turbo water feed runs right under the center exhaust port and there is a bit of a blobby weld that might have a pin hole?

Just thinking outside the box here.....