markleb · May 22, 2012

Hi all

Had a small amount of oil when changing plugs (on two of the plug wells only) - so wanted to do quick compression test.
I'm thinking it may just be a small leak in gasket, but want to rule out bigger probs.

Is it correct that I should remove fuse for fuel pump and un-plug all coils before screwing in compression tester and turning engine over??

Not done one before, but have the tester, just want to make sure have the correct procedure.

Thanks in advance for any advice,

fanatic · May 22, 2012

throttle fully depressed and crank same time for each cylinder

markleb · May 22, 2012

fanatic said:
throttle fully depressed and crank same time for each cylinder

Thanks - I assume my other bits of the procedure were right too??

Cheers

jt_armstrong · May 22, 2012

Wont do any harm to remove the fuel pump relay. I have normally just disconnected all the HT leads at the plug ends. Make sure engine is warm and throttle is open when you take the reading. Do each cylinder dry and then squirt a bit of oil in and repeat the process. Expect to see a difference especially if the rings are worn.

markleb · May 22, 2012

jt_armstrong said:
Wont do any harm to remove the fuel pump relay. I have normally just disconnected all the HT leads at the plug ends. Make sure engine is warm and throttle is open when you take the reading. Do each cylinder dry and then squirt a bit of oil in and repeat the process. Expect to see a difference especially if the rings are worn.

Cool, thanks for that, much appreciated.

vougese39 · May 22, 2012

4.4 engine oil leak in the plugs will proberly be the rocker cover gasket.
You may get a engine fault due to cranking with plugs and coils disconnected and the fuel pump relay out too

markleb · May 23, 2012

vougese39 said:
4.4 engine oil leak in the plugs will proberly be the rocker cover gasket.
You may get a engine fault due to cranking with plugs and coils disconnected and the fuel pump relay out too

Thanks. I was thinking it was rocker cover gasket, hence the thought to do a compression test to rule out issues.

Is there a better procedure, if how I plan to do it is wrong?

Do you mean it will throw up a EML light? If so, I assume I can cancel this with my OBDII fault code scanner...

Thanks.

wammers · May 23, 2012

markleb said:
Thanks. I was thinking it was rocker cover gasket, hence the thought to do a compression test to rule out issues.

Is there a better procedure, if how I plan to do it is wrong?

Do you mean it will throw up a EML light? If so, I assume I can cancel this with my OBDII fault code scanner...

Thanks.

Doing a compression test is quite a novel way of checking for a oil leak from the rocker covers. If you had oil in the plug cavities there is only one place it can be coming from. It won't be being blown up past the plugs that's for sure.

markleb · May 23, 2012

wammers said:
Doing a compression test is quite a novel way of checking for a oil leak from the rocker covers. If you had oil in the plug cavities there is only one place it can be coming from. It won't be being blown up past the plugs that's for sure.

Thanks, I'm not looking for novel ways to check anything, just trying to put my mind at ease.

I'm no expert (obviously!) but had been told that it was best to rule out any other problems related to any oil by the plugs, other than the obvious gasket?

I have no idea - just what I've been told/read

rewmer · May 23, 2012

As already mentioned, your oily plugs are due to a failed rocker gasket. Does it smoke at all ? And how is the idle? These two things can be a sign of a failed PCV valve on the back of the inlet manifold which can also lead to oil being forced through the gaskets.

wammers · May 23, 2012

markleb said:
Thanks, I'm not looking for novel ways to check anything, just trying to put my mind at ease.

I'm no expert (obviously!) but had been told that it was best to rule out any other problems related to any oil by the plugs, other than the obvious gasket?

I have no idea - just what I've been told/read

If you had enough oil in the cylinders to blow past the plugs which it won't. You would be laying a smoke screen better than any WWII destroyer could ever manage.

markleb · May 23, 2012

rewmer said:
As already mentioned, your oily plugs are due to a failed rocker gasket. Does it smoke at all ? And how is the idle? These two things can be a sign of a failed PCV valve on the back of the inlet manifold which can also lead to oil being forced through the gaskets.

No smoke, no idle issues. I assume just gasket then?

markleb

New Member

fanatic

RESPECT IS EARNED, BEATINGS ARE FREE ;-)

markleb

New Member

jt_armstrong

Well-Known Member

markleb

New Member

vougese39

Well-Known Member

markleb

New Member

wammers

No longer with us, RIP

markleb

New Member

rewmer

Well-Known Member

wammers

No longer with us, RIP

markleb

New Member

Similar threads