hi there guys, just tested the compression on the 1242 due to the suspect head gasket, got 10 bar at cylinders 1 and 4, but got 14 bar at cylinder 3, couldnt get to cylinder 2, was getting too hot and i was getting hungry can anyone gather anything from these results? I'll check the other cylinder ASAP

many thanks

Lenny

On cylinder 3 was the reading constant or bouncing?

Cheers

D

dunno couldn't tell because the pressure gauge has a non return valve on the incoming. If I held in the reset button whilst the gauge was on would this show me if the reading was varying?
Many thanks
Lenny

It worries me that you say that the engine was getting hot. You weren't doing this with the engine running were you?

take all the plugs out.

Disconnect the LT leads from the coils. Do it on the starter motor. If you have a leak from one cylinder to t'other then its won't pump up.

I think, its Saturday night and this wine is tasty, hic.

Cheers

D

Well my compression testing kit tells me to run the engine until warm then remove all plugs, disable the coil packs, disable injector(s)/carb & then do the test. This does make cylinder 2 hard to access with the manifold & TB in the way. I found if you do it last it makes things easier.

Agreed, doing it when warm, but it shouldn't get any hotter the more you do.

Cheers

D

I think with the sunshine this weekend HE was getting hot and hungry

Get the rest of the results in tomorrow

Kristian

kritip said:

I think with the sunshine this weekend HE was getting hot and hungry

Get the rest of the results in tomorrow

Kristian

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Not funny.

Saturday was constant drizzle and bloody cold too, thanks.

Cheers

D

right, just done the test exactly as stated by people here, and the results are

Cylinder 1 - 1st crank - 10 bar - pumped up to 19 bar quickly
Cylinder 2 - 1st crank - 5 bar - pumped up to 19 bar very slowly
Cylinder 3 - 1st crank - 10 bar - pumped up to 19 bar quickly
Cylinder 4 - 1st crank - 7 bar - pumped up to 19 bar slowly

but when putting my plugs back in I have also realised that my plug on cylinder 4 doesn't go in all the way, as the threads are damaged, it only gets in about 1/3 of the way would have thought i would have noticed this before but i can honestly say i haven't, but when looking in at the threads with a torch, it looks like they haven't been used in some time.

any ideas for these things?

many thanks again for all your help

Lenny

Are these the wet or dry figures?

Number 4 looks like it could be the plug not in properly and number 2 is an issue.

Cheers

D

these are dry results, would the plug not being in properly make a difference? because the plus was out when the test was being carried out?

thanks again

Lenny

SlinkyCinqi said:

these are dry results, would the plug not being in properly make a difference? because the plus was out when the test was being carried out?

thanks again

Lenny

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deffo, one was gone on my 20v, i had to change the head

i meant make a difference to the test, i know it would make a difference to the car running! lol unless what was meant was the plug of the compression tester not screwing in properly?

thanks again

Lenny

If you can find one to the right size you could try running a tap throught the threads to clean them. Be Extremely careful though as you could completely sh*g the head.

Tone

i've just compression tested mine and got 14bar accross the range. your results seem very odd mate.

variation of 1bar between two cylinders normally indicates a problem, and i'm not sure why the readings are peaking at 19bar though.. thats far too high. wonder if it down to the tester u are using.

Tone34 said:

If you can find one to the right size you could try running a tap throught the threads to clean them. Be Extremely careful though as you could completely sh*g the head.

Tone

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i tried that only to find some tart before me had had the head helicoiled once already! lol

Tone34 said:

If you can find one to the right size you could try running a tap throught the threads to clean them. Be Extremely careful though as you could completely sh*g the head.

Tone

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The problem is that any crud removed ends up in the cylinder. Do a wet test to indicate whether its head or bore problem on number two. At the end of the day the head has got to come off anyway, so just pop the head off and investigate.

Cheers

D