Going to buy a compression tester now

Lol Grant thought you said it would rev to 10k

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1968 Morris Mini Cooper S

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"Show me the Mini!"

These are the first things I would re-check...maintenance induced faults are quite common :idea:

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"Show me the Mini!"

YES

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"Show me the Mini!"

recon your left nut is safe

compression test done

number 2 and 3 low but holds guessing head gasket

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1968 Morris Mini Cooper S

Before you take the head off put a points dizzy back in and run it. My electronic dizzy started to splutter then dead.

Easy to do may save you a heap of work.

What compression pressures did you get?

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67 Deluxe
Dry suspension
1293cc, 11:1 comp, RE 282 camshaft, 45 Weber, extractors etc
4 synchro close ratio gbox
Cooper S brakes, no booster
Stealth box, as Doc says "goes harder and idles!"
RH tank cos I needed it crossing the Nullarbor etc..

I couldn't warm the engine up so couldn't get a proper reading but 1 and 4 around 150 and 2 and 3 around 50

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1968 Morris Mini Cooper S

I wouldn't have bothered with a compression test, I wouldn't have even put my thumb over the plug holes

It's a 1275, when they blow headgaskets it's between #2 and #3, if the engine runs badly all of a sudden and sounds like a tractor, and you can pull the leads off #2 and #3 without it making any difference, it's a head gasket

a couple of months ago I found a bloke I know with an 1100 stopped by the side of the road, it had stopped for another reason but was running like crap and sounded like a tractor, pull #3 and #4 off without making a difference (#1-#2 and #3-#4 are the weak point on small bores) - I didn't bother with a compression test - blown head gasket... it had even eroded the head between the chambers

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did I tell you that I won a trophy?

​http://www.tuneruniversity.com/blog/2011/05/check-your-engines-health-with-a-vacuum-gauge/

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"Show me the Mini!"

found the issue

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1968 Morris Mini Cooper S

So the winner of the problem diagnosis competition is Simon. Well done. A chocolate Freddo frog is on its way to you.


Your left nut is safe, at least for another day.

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ex-NSW Police 1970 MK II Cooper S
VMCI #43

Looking at that brown crud, it appears that a good flush of the cooling system won't go astray either. That gasket hasn't seen daylight for years.

Interesting enough I just replaced the radiator the water pump and thermostat and at the time I did a flush But something told me there may have been a blockage somewhere when checking with the heat gun it was inconstant.


My coolant stayed green for a few weeks then one day it changed to brown (clog gone)

I said to my wife a week earlier i think the head gasket is about to go as i saw that brown water marks down the front of the engine

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1968 Morris Mini Cooper S

I reckon you should have the head refaced, and after you've cleaned all remnants of the gasket off the block, get a nice clean (well oiled) oilstone and gently clean the top of the block with it - randomly go all over in all directions - figure eights in different directions etc. etc. You should be able to get it shiny all over including between #2 and #3 where it's dark right now

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did I tell you that I won a trophy?