compression figures BX19

BXrunner · Post by **BXrunner** » Sun Mar 09, 2008 5:59 pm

Can someone give me the range of compression figures for the BX1905 engine as I have the creamy gunge in the oil fillter cap down the barrel too. I hope it isnt the cylinder head gasket as this looks a nightmare

thanks in advance

tim leech · Post by **tim leech** » Sun Mar 09, 2008 7:48 pm

If the engine starts and runs ok and theres no oil in the water you should be fine, if your cars been used for short runs that will be the cause, get the engine oil and filter changed asap! I had the same problem on a couple of my 1.9 Petrols.

BXrunner · Post by **BXrunner** » Mon Mar 10, 2008 6:48 pm

tim leech wrote:If the engine starts and runs ok and theres no oil in the water you should be fine, if your cars been used for short runs that will be the cause, get the engine oil and filter changed asap! I had the same problem on a couple of my 1.9 Petrols.

The gunge was found after a long run or 50+ miles. If someone can give me the cyllinder compression figures I can determine if the car needs a new head gasket. I can't decide if it has oil in the water or not though there is a touch of the rainbow effect from oil. Engine runs a touch lumpy although I think this i due to the idle speed running very low

AlanS · Post by **AlanS** » Mon Mar 10, 2008 9:14 pm

Do a compression test.
If there's more than 10% difference between the lowest and the highest reading, the head needs to come off; that's the rule of thumb.
As far as quoting actual psi readings, then again, this depends on the engine model but again as a rule of thumb, 175 psi seems to be a median pressure to work from.
If this creamy looking crap is in the filler/breather system, that's the old mayonnaise problem they've had for years, usually fixed by cleaning out thoroughly and fitting a new thermostat.
If it's showing up in the cooling system, it will be the head gasket being rotted away due to lack of or old degraded coolant and in that case, it's only a matter of time before the head has to come off for the new gasket. In that case, don't travel too far or you'll come home on a flatbed one day.

Alan S

BXrunner · Post by **BXrunner** » Mon Mar 10, 2008 9:20 pm

AlanS wrote:Do a compression test.
If there's more than 10% difference between the lowest and the highest reading, the head needs to come off; that's the rule of thumb.
As far as quoting actual psi readings, then again, this depends on the engine model but again as a rule of thumb, 175 psi seems to be a median pressure to work from.
If this creamy looking crap is in the filler/breather system, that's the old mayonnaise problem they've had for years, usually fixed by cleaning out thoroughly and fitting a new thermostat.
If it's showing up in the cooling system, it will be the head gasket being rotted away due to lack of or old degraded coolant and in that case, it's only a matter of time before the head has to come off for the new gasket. In that case, don't travel too far or you'll come home on a flatbed one day.

Alan S

Been there done that on flat beds . I'll change it I can nab a look at the haynes to get torque figures and to find if it's a 2 stage torque ill change the thermostat too as Im about to do a long run. Work to Brussels brussels to poland poland to moscow and back again over three weeks

jeremy · Post by **jeremy** » Mon Mar 10, 2008 10:24 pm

Haynes (petrol) here - top doc under BX. Its in english as are the workshop manual sections. Katalog is a parts list.

http://citroeny.cz/servis/servis.htm

BXrunner · Post by **BXrunner** » Mon Mar 10, 2008 10:49 pm

Thanks this helps a lot.