I've got good compression on all cylinders but no. 3 is 10% higher than the other three. I've also got smoke - lots of it - from the tailpipe with anything more tha idle speed, and oil on the of piston no. 3. So, as this engine sat around abandoned for a long time (with the rest of the car) am I simply looking at valve stem seals, or guides as well? The engine's only got 70,000 miles on it and is quite quiet. It's a '92 1275 single carb model.
#1
Posted 28 May 2018 - 03:13 PM
#2
Posted 28 May 2018 - 04:39 PM
The colour of the smoke will determine the answer.
Doesn't sound like valve stem seals.
White could be coolant or brake fluid ( via the servo).
It could also be burning off loads of condensation after sitting for a while. Have you driven the car recently for a good distance? Rings can gum (and free) up.
#3
Posted 28 May 2018 - 05:01 PM
The smell of the smoke says engine oil to me and there is fresh engine oil on top of piston no.3. I would expect ring problems to cause a loss of compression. I can eliminate a brake fluid issue by disconnecting the vacuum hose. I haven't driven it far because it's leaving a smokescreen behind it. I'm in the south of France and the car's in my garage, we don't have condensation
#4
Posted 28 May 2018 - 06:30 PM
Explore all other options first, but at a guess, I'd say, given that it sat around for a while, one of the valves for No. 3 cylinder was open during that time and the bore got a little rusty, damaging the rings on that piston.
#5
Posted 28 May 2018 - 06:47 PM
When we fitted it we primed the oil pump, fitted a new clutch(and primary gear seal), water pump and a general service) If left for more than 48 hours it would let off a plume on initial cold start up (lasted for about 500 miles of daily running, at approx 20 miles a day) then cleared, it runs sweet ? it was simply dry valve stem oil seals.
Post edited for clarity and my wild guess...
Edited by cal844, 28 May 2018 - 06:48 PM.
#6
Posted 28 May 2018 - 07:04 PM
Hmmm. This engine wasn't run for about 8 years. I'm still puzzled by augmented compression if there is cylinder damage of any sort.
#7
Posted 29 May 2018 - 07:01 PM
What compression readings did you get?
Just possible that number 3 has been oily for a while, and you're seeing increased pressure because of more carbon build-up in that chamber than the others.
Also the head chambers are rarely exactly the same, I have seen differences of between 0.5 - 1.0 cc on a standard head.
#8
Posted 29 May 2018 - 07:18 PM
1-4, 155psi, 150psi, 170psi and 155psi (the calibration of the gauge may be a bit out but the error is consistent). I can dip a piece of paper on to piston 3 through the plug hole at tdc and get remarkably fresh looking oil on it.
Edited by need4speed, 29 May 2018 - 07:18 PM.
#9
Posted 08 June 2018 - 02:44 PM
Took it out on the road today - the first time that car has seen a road for 10 years and the smoke problem has disappeared. First time I've driven a Mini for 35 years - what a hoot! It just shouts "faster" at me.
#10
Posted 08 June 2018 - 03:25 PM
#11
Posted 08 June 2018 - 03:30 PM
In this case it appears so.
#12
Posted 08 June 2018 - 03:33 PM
The old Italian tune up method
#13
Posted 08 June 2018 - 08:49 PM
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