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leaking oil from OIL FILLER CAP
https://www.ausmini.com/forums/viewtopic.php?f=5&t=84192		 Page 1 of 3
Author:  micool [ Tue Jan 14, 2014 7:00 am ]
Post subject:  leaking oil from OIL FILLER CAP
hey Guys
how do I stop oil coming out of the little hole in my oil cap and making a mess in my engine bay.
im using to chrome one from mini sport

http://minisport.com.au/prod474.htm
Author:  Mick [ Tue Jan 14, 2014 8:47 am ]
Post subject:  Re: leaking oil from OIL FILLER CAP
Make sure your breathers are free and open into a catch can, or an engine PCV.
Also, you may consider putting a vented rocker cover on the engine, if you don't already have one, to also plumb into your engine breather system.

EDIT: From your other thread, there is just one breather from the primary gear cover to the charcoal canister. Is there another on the timing chain cover? What about the tappet chest cover? The Tappet chest should be enough to ease the problem.

Your carb already has an engine emmissions port which can have a hose plugged into it. This will draw down the engine blow-by. The pressure needs to go somewhere, and it will find its way out wherever it can.

Use the primary gear cover vent, the rear tappet cover and the port on your carb, and this should be enough to fix it on its own.

Image
Author:  micool [ Tue Jan 14, 2014 9:26 am ]
Post subject:  Re: leaking oil from OIL FILLER CAP
thanks for the help mick wish I knew what you meant.
ill start doing some research on some of the things you said and see how I go.

Also just went a got myself some 20w-60 oil is this right, the guy had no idea at Repco.
Author:  Mick [ Tue Jan 14, 2014 9:46 am ]
Post subject:  Re: leaking oil from OIL FILLER CAP
It will be your aluminum rocker cover which is without a breather causing the problem here. You could go back to a stock rocker cover with a breather on it, but there are also other ways to fix this if you want to keep the cover.

The breathers allow the blow-by gasses released from the cylinders under combustion to be released to the atmosphere, or sucked into the intake to be reburnt. You have a single breather on the engine above the clutch cover.
Here:
Image

You have a port on your carb which will draw in the emissions and burn them in the engine. This will reduce pressure inside the engine and allow the gasses somewhere to go a little easier.
Here:
Image

There should be another breather that looks a little like the one above, but fitted below the carb on your left end side of the engine. There's a cover with a single bolt in it. If it does not have a cover fitted, then you can get one and put it on with a new gasket and mounting bolt seal.
Image

the easiest way is to change the rocker cover out, but sorting out the breathers on your car will help all around.

All unblocked ports on your carb should be blanked or put to use. I think I can see a vacuum port as well that is unblocked.
Author:  micool [ Tue Jan 14, 2014 9:53 am ]
Post subject:  Re: leaking oil from OIL FILLER CAP
Wow thanks Mick that was a great help.
ill start having a play with it tonight
Author:  Irish Yobbo [ Tue Jan 14, 2014 4:27 pm ]
Post subject:  Re: leaking oil from OIL FILLER CAP
micool wrote:
Also just went a got myself some 20w-60 oil is this right, the guy had no idea at Repco.


The 'best oil for a mini' is a can of worms. 20W50 mineral oil is recommended by most. I think most people on this forum agree that the Valvoline XLD Classic is quite a good cheap oil for a mini. Some say that Castrol Edge 25W/50 is the best, but it's also quite expensive...

Wait until supercheap/ autobarn have a sale - you can sometimes get the valvoline for $10 a bottle.
Author:  mini_mad_matt [ Tue Jan 14, 2014 6:18 pm ]
Post subject:  Re: leaking oil from OIL FILLER CAP
I wouldn't be too quick to block all the ports on that carb though, i'm pretty sure the lower port is to do with the fuel bowl isn't it? But the port Mick has nicely drawn an arrow to should either be blocked up or used as mick explained.
Author:  Mick [ Tue Jan 14, 2014 6:45 pm ]
Post subject:  Re: leaking oil from OIL FILLER CAP
Yes, you're right Matt. Don't block the fuel bowl breather, but it should technically be run to the charcoal canister.

The other open port I was alluding to is the vacuum port in the top center of the carb flange. it looks as if the 1/8th vacuum line has been cut off?
Author:  mini_mad_matt [ Tue Jan 14, 2014 6:50 pm ]
Post subject:  Re: leaking oil from OIL FILLER CAP
looks like maybe a rubber cap is on it.
Author:  micool [ Wed Jan 15, 2014 1:57 pm ]
Post subject:  Re: leaking oil from OIL FILLER CAP
Image

Can I replace the Can in the conrner with a modern Oil catch Can?
also does this have anything to do with my brakes? I was talking to my next door neighbour and told him that I need to do something about the brakes like add a booster and he was telling me that the oil can has something to do with the brakes that's why its not stoping too good ?

also have a few other questions as in the pic
1. hole down the bottom (should this have a pipe to it?)
2. hose at the top just runs down to nothing.
3. there is a very small hose that runs down the car what is this for ?

also told a few more pics of the carby.
Image
Image
Author:  MiniVLT [ Wed Jan 15, 2014 2:47 pm ]
Post subject:  Re: leaking oil from OIL FILLER CAP
Ok, black canister in the corner is the charcoal canister. It absorbs fuel vapour from the fuel tank instead of letting it escape to atmosphere. The green arrow, small line, is the vent line from the fuel tank for the vapour. If you look in the boot at the fuel tank, there should be a line coming out of the top of the fuel tank, which is the vent line.
The open hole at the bottom of the canister is normal I believe.
The hose that goes nowhere will need to go to the carby. This hose then draws the vapours out of the canister and into the carby to be burnt. I THINK it goes to the brass connection on the r/h side of the carby pointing up at 45 degrees.

So the carby constantly draws air from the canister, which constantly draws oil vapour / blowby from the hose connected to the top of the flame trap on top of the clutch housing. This should draw the air through you oil filler cap and into the engine and then out the flame trap!

Cheers Shane
Author:  Mick [ Wed Jan 15, 2014 2:56 pm ]
Post subject:  Re: leaking oil from OIL FILLER CAP
That brass connection on the right hand side of the carby looks like it has been soldered up. Is that so?

Image


If it has been, it has been done chasing performance figures. You will need to have your engine vents go to a catch can, which is pretty much what it is doing now, and continue wiping the oil from the top of the engine periodically. You can always still fit a vented rocker cover and feed it to the catch can as well which will relieve the oil stains around the top of the engine.

That is, unless you feel the need to unblock the port. You would be best speaking to GR about this as it will affect the tuning.
Author:  micool [ Wed Jan 15, 2014 2:57 pm ]
Post subject:  Re: leaking oil from OIL FILLER CAP
yep that's right
Author:  micool [ Fri Jan 17, 2014 8:41 am ]
Post subject:  Re: leaking oil from OIL FILLER CAP
if I add a oil catch can will this solve my problem ?
And is this the best way to do it.

Image
Author:  Mick [ Fri Jan 17, 2014 9:30 am ]
Post subject:  Re: leaking oil from OIL FILLER CAP
No, the same problem will still remain. There is pressure buildup at the top of the engine which is being released through the small hole in the cap with whatever oil mist is there at the time.

You need to create a vent at the top there through either:
a. replace the rocker cover with a vented one
b. create a vent in the top cover (perhaps a threaded barb, or tig weld in a sort stub of 3/8 tube)
c. install a rear tappet chest vented cover.
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