Adu crankcase

[jax1]

Just done head work, new valve stem seals, guides. Put now comes little white smoke like steam coming out from the crankcase ventilation and dipstick when car running.
I did compression test and pressure was good in all cyinder. There is also new oil in engine and not smoking from exhaust. Coolant level seems okei too, but maybe there is a very little leak somewhere. I cleaned whole system too and put some new hoses, I have catch tank there, did everything like before head repair. Any ideas???

Thanks!!!

[Error404]

what head work did you get done? Did the head get pressure tested?

[jax1]

valves polished and sockets cut, who done head work sayd that everything is good now,

[popdemonic]

any leakdown test?compression test just tells you which cylinders has the low compression but didn't reveal the culprit.i recently did the compression test and spot on the cylinder#2 which has
slightly lower number reading.i did the leakdown test and found one of my
intake not properly sealed.

[tomwood_uk]

Did you clear the cam followers of oil before the re-fit? If you've had the valve seats cut and didn't evacuate the followers they can hold the valves off their seat slightly. Had this problem with a Skyline a couple of weeks ago.

[jax1]

they told me that they have to do that before put it back together. Just looked, from dipstick didn't come steam any more, only from catch tank, but now comes I lot less than before, only little puffs coming there

[newsh]

Maybe a little coolant went in the crankcase when the head was taken off.

[jax1]

Maybe, but first time I started car with old oil in it then I changed it and right after that seems there comes less steam with new oil. But when mechanic didn't clear hydraulic valve lifters before he puts them in, is possible that now valve is not closing completely and I can somehow check this out that every valve is working correctly?

Thanks!!

[Bowie69]

Yes, do a compression test.

I personally don't think the steam is a worry.

[jax1]

just pressurise cylinder from spark plug hole? How much bar I must pressurise and how long must it hold pressure?

thanks!!!

[Bowie69]

TBH, you could probably stick a hose pipe into it a blow, and you would get a good appreciation of the sealing of a cylinder.

But a compression test would give you actual numbers.

[tomwood_uk]

Maybe, but first time I started car with old oil in it then I changed it and right after that seems there comes less steam with new oil. But when mechanic didn't clear hydraulic valve lifters before he puts them in, is possible that now valve is not closing completely and I can somehow check this out that every valve is working correctly?

Thanks!!

A leakdown test is a great way of ensuring that your valves are seating correctly. If you're unsure how to do it;

• Test each cylinder individually with the piston at TDC on the power stroke
• Screw the pressure pipe and fitting into the spark plug hole. Connect the pressure regulator inbetween your airline and the pipe
• Apply the required pressure to the cylinder (it will tell you the correct pressure to use in the instructions)
• The gauge will usually display a percentage of leakage. Note that a certain amount of leakage is to be expected into the crankcase and will be heard leaking out the dipstick tube/ crankcase breathers)
• Listen down the exhaust and intake for any leaks, make sure you open the throttle slightly to make sure.

As mentioned this procedure may not give you the definitive answer you're looking for, but it may help