I think the coolant may be blowing out the cap?
anyone run more than 13lb caps?

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It's easy once you know how.

13lb cap is plenty.
If you fill it right up they do blow a bit out when hot the 1st time, due to expansion.
When it cools the level will drop back, but next time it's run the level will rise to full again.
The top tank should only be 1/2 full when cold for this reason, there is a level marker inside the tank.

[hint] The ring inside the neck where the cap seats must be clean. Rub a bit of 180 grit or whatever paper round it, check it is unmarked, then fit a new cap.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

You've been playing with head gaskets too, you lifted the head off three times I think?
So watch for the level going lower than the top of the core tubes, you might have a bit of blow by going on.

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

Have put a 15lb cap with an added rubber washer under the cap bottom.
doesnt pump coolant out now.
but does leak slightly around where the cracks are present in the filler neck.
Back to the shop for him.
yeah Mick you can count well.
I think if you go to link for a head gasket tomorrow you may be disappointed.

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It's easy once you know how.

Just supporting local business.

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

Not meaning to highjack, but, what cap should I use when fitting an overflow bottle. Brand, part number ?

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Find a job you love and you will never have to go to work !

If you mean the Moke/Morris 1100 pressurized overflow bottle then its the GRC126 Flat Cap.

http://minisport.com.au/moke-and-mini-w ... diator-cap

Or are you after the modern type bypass recovery, from the plastic bottle?

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

Bypass recovery from a plastic bottle.

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Find a job you love and you will never have to go to work !

CPC don't have one, at least not in the standard mini 80mm x 27mm (long neck) and I haven't found another yet.

I'll have a bit more of a look around.

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

http://www.cpcauto.com.au/catalogue.aspx
Radiator Caps Recovery 543-13 for leyland minis and mokes
http://www.cpcauto.com.au/radiator_caps ... tNo=543-13

http://www.cpcauto.com.au/radiator_caps ... tNo=517-13 is a 27 mm one

Yes, there are short and long neck radiators. Our rads were long neck ,so unfortunately the 22 mm won't seal on the long necks.

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

having a short one fitted Sat morning while still in car.

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It's easy once you know how.