13 replies to this topic

[ryomini]

(ok these are the RESULTS of my compression test that come at the end of my other post 'compression testing do's and dont's)

 

Boy oh boy oh boy am I glad that you people with experience, knowledge, eyes and ears are out here,

 

actually I see some people like 'cooperman' for example who have built and raced and been in and out of a mini like Dr Who in his Tardis, what a wealth of information and experience, thanks so much for sharing and helping out - gotta keep my mini on the road and gotta get through the next mot

 

so * I did my homework*

 

* RESULTS *  * RESULTS *  * RESULTS *

 

Millwall 1 - Burnley 0 

 

ok seriously here we go

 

I unplugged the distributor from the power source from the bottom as the fuel cut off also -  seems to be good practice

no fuel, no spark, no fire - more mini

 

I used a bought from new Gunson Hi-guage  I tried my best to count 7 crank rotations for each reading with what during the rotations

 

cyllinder 4

14 bar

200 psi

 

cylinder 3

15 bar

220 psi

 

cylinder 2

13.9 bar

195 psi

 

looking good so far right ???????

 

cylinder 1

8.0 bar

110 psi

 

cylinder 1 second reading

8.2 bar

120 psi

 

added one tablespoon 10w30 fresh oil to cylinder 1

cylinder 1 plus tablespoon oil

11 bar

160 psi

 

then upon initial start up exhaust puffed white smoke for about 20 seconds

then black smoke and now it puts out a constant light, quite hard to see if you don't look hard, stream of black smoke

 

additional information - I cleaned the plugs yesterday and drove about 20 minutes in traffic.  Took out the plugs today for a compression test and they were heavily fouled, sooty and a little oil all 4 exactly the same

I put an old toothbrush in the 4 spark plus holes and wiggled it around - same it comes out very sooty and a little oily for all 4 cylinders

 

hope this helps the experts out here as I really need help for the NEXT STEP

 

my conclusions as an inexperienced sunday avo tinkering type are that it seriously looks like I have a broken or stuck oil rings or ring or a scored piston or chamber or something that essentially means I will have to have the HEAD OFF

 

the car actually runs very smoothly and there is little tappet noise

starts first time, no accelerator and idles perfectly

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Edited by ryomini, 10 June 2015 - 07:30 AM.

[russo]

Firstly: Did you have throttle fully open while winding engine over?

Secondly: How long since you checked valve clearances as could be little or no valve clearance on number 1 cylinder. May only be valve starting to burn. I'm guessing that if it is rings the compression would have come up more by putting oil down bore.

[ryomini]

Russo

thanks for your input

good to know that all may not be bad

I cleaned out all the vacuum tubes grey one, red one and yellow one

then took a 15 minutre run with hard acceleration

the car runs like a dream

came back pulled the plugs - all are really sooty and that is just after 15 mins of brisk to normal driving

 

yes I did the compression test with what ie my foot full down on the acclerator pedal as I turned over 7 times

could be that the compression testor wasn't seating well in cylinder 1, it's the hardest to tighten up because

of the ttube that runs above the plug - but I did end up doing 3 readings for that cylinder

 

car used to run fine until a couple of weeks ago

 

I did the tapets last year and only do around 3000kms a year so I'd be suprised but it's easy enough for me to check on the tappets

I'm beginning to get fed up of trying this and trying that and not getting much progress made.  The plug fouling is becoming an issue as the car doesn't want to start if I don't pull the plugs and clean them all the time now

 

ughh

[Nick Warwick]

Sounds like it's running rich if its fouling the plugs that fast.

[ryomini]

Nick I would agree

so 2 questions

1 why is it suddenly running rich

2 what can I do about it

[Cooperman]

With regard to the compression test, it may well be an exhaust valve is burning out. A common problem and one which will allow unburnt mixture to go down the exhaust.

Take the head off and strip the valves out for a good look at the valves and seats.

This was such a common problem with the earlier 850, 997 & 998 engines and it can still happen with the larger engines.

Don't panic (Captain Mainwearing). Keep calm and whip that head off  .

[russo]

I would be doing a leak down test. That will tell you if rings or valves. Its nice to know what problem is before you start dismantling engine as if you find nothing its too late for further diagnosing.

[Spider]

How about?

 

 

Nah, just kidding, I'm sure the guys here will off some good advice.

[ryomini]

Don't panic Mr Mannering !  - as I kid I used to really love that show (ah nostalgia)

 

@ russo I 100% agree with you, I don't have a compressor handy and I am a bit worried I might

put too much air in and damage a seal somewhere (never done a leak down myself, would like to do it with someone who really knows what they are doing)

either way the head has to come off

 

@cooperman - yep I guess at 80 000kms on a used car with an unknown history there could be need of a little head maintenance

when you say a 'burned' valve do you mean carbon build up or pitting on the valve - the valve in question would just need cleaning and bedding in (or worse replacing) - and obviously would be recommended with this kind of mileage to fit new oil seals (which I would have to order (and I believe the brown viton ones are supposed to be a little better) )

 

I agree with and THANK YOU all profusely (lovely word eh) but that would all make very good sense to me if only cylinder one was fouled - can someone explain why all 4 cylinders are fouled and equally so - that is what really throws me off ??????? ??? ??

Edited by ryomini, 11 June 2015 - 03:03 AM.

[69k1100]

Could be excess crankcase pressure or over filled oil.

Leave the car on level ground for 5-10 minutes then check the oil level.

[TMW.Racing]

 

Millwall 1 - Burnley 0 

 

The optimism all the way from Japan makes me happy - predictions of a Millwall victory at this early stage of the summer!! 

[FlyingScot]

The rich running is related to your other question posted about fuel traps, without the MEMS ECU getting a vacuum signal she's over fuelling big time. Replace the fuel trap and vacuum lines and the fuelling will correct itself, don't leave it as you will damage the cat.

FS

[ryomini]

@tmw haha ;)

@flying YEP that is exactly right - I have now fixed the vacuum connector rubber problem that was

causing massive super rich running

I shall check the compression in cylinder one again in a couple of days and again a few days after that

maybe I just made a poor reading

but if the prob is still there I may think about getting my head done

if the prob is not there it's plain sailing for a while

many thanks for your input and suggestions - one problem solved at a time and we get there in the end

[ryomini]

Yop

 

what's the dumbest part of your car ?

 

Me.

 

Just did the compression check again for peace of mind and what did I realise

 

muggins playing at Mr Simpson again

the rubber sealing o ring had slipped off the compression tester and so it wasn't sealing well - doh

 

now got wonderful readings in all 4 cylinders and really chuffed about that

 

need another ride out to see if the vacuum hose issue is sorted and then in a few weeks a full oil change

just did the breaks today too, so feeling better