oil leaking from bottom tappet/valve cover

[Joe90]

Cant understand this as it was fine before i done a few jobs.
Ive got oil leaking very fast from the bottom tappet cover. None of mine had gaskets on when i removed them just rubber seals. Top ones fine and so are all the repairs i done earlier. Ill tell you what i done incase this could affect it....


Helicoiled sump nut
Added an oil cooler
Changed clutch casing gasket
Changed the take of plate gasket and re tightend nuts around that area...

Meant to be riding to work in morning aswell

[JordyRoo]

just whip it off & stick some sealant on it or a new o ring.

[Joe90]

Originally Posted by JordyRoo

just whip it off & stick some sealant on it or a new o ring.

Dya reckon thats all it is the o ring? Ive got a load of them but this one looks flat. Ill add a round one and see what happens.

Would pressure anywhere cause it jord or do you think its defo the seal.

[JordyRoo]

would be the O ring mate or overfilled maybe?

[Joe90]

Changed the oring and now its pushing out of the bottom left bolt from the front cover where the cylinder slots on. Its like a pressure leak to me, i put 900ml in it as it was empty, what could i possibly have done to pressure up the oil system?

Oil cooler is all i can think but thats just a simple bolt on jobby...

[Joe90]

Just re torqued all the nuts and same problem. Defo seems like a pressure leak.

When i was drilling the sump nut for the helicoil i noticed i went a little too far into the oil feed hole but didnt do any damage just an indent. Providing the is meant to be a hole above the oil filter inside the sump...

(Please dont tell me i made that hole lol )

[pitdogrider]

I know this is an old thread but I had the same problem while fitting my new ZS190 engine to my Kurz RT1 this week, the engine ran perfect with only the link adaptor installed, then I fitted a rad type oil cooler that I had tested by blowing through and I had severe back pressure within the engine causing oil to piss out of the crank breather pipe, on a 20min ride I'd loose half my oil.
I bought it back and decided look at why it happened, all could think is the problem was the 2 banjo bolts that mount the pipes to the engine, each banjo bolt has a hollow centre and also has 2 holes each side by the head. I put a pen mark on the head of the bolt in line with the two holes and tightened the banjo bolt up, once tight neither hole in the side of the banjo bolt lined up with the oil cooler hose so I removed the bolt and added more banjo bolt washers and tightened until they lined up.
I started the bike last night and hey presto no more spraying oil out the crank breather, and yes I know that the cooler pipe adaptors have a larger bore where the banjo bolt goes through to allow oil to pass around the outside but this was still restricting flow, nice simple mod that I shall do with all my bikes with this fitment in future.