If i have lots of smoke coming from my oil cap, does that mean my valve seals are out? My motor still runs ok, and my catchcan has lots of nasty oil build-up coming from the motors. So i'm guessing my valve seals are bad. BTW- it's turboed.

 

ringey dingeys

 

I always thought that if my rings are bad, that 1) I would blow smoke out of my exhaust, and 2) a compression test will show lower readings.

So I figure the if i have lots of smoke coming out of my oil cap (blow by) then it's air bypassing the valves into the valvecover therefore blowing out of the oil cap.

dam turbo...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tuan &raquo;</TD></TR><TR><TD CLASS="quote"> my catchcan has lots of nasty oil build-up coming from the motors. </TD></TR></TABLE>

Sounds like your rings are shot. A compression and leakdown test will confirm that. With bad valve seals, you will see black smoke out of your exhuast.

-Jeff C.

 

so youre car is not smoking from the exaughst but its blowing oil through the oil cap damn that **** must be blowin hard but yeah i would say possibly valves ...

 

Do a compression test. If your #'s are very low, do the "cap of oil" trick, and recheck it. This will help determine whether your rings are sealing properly. Ask here if you have more questions.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jcda6 &raquo;</TD></TR><TR><TD CLASS="quote">

Sounds like your rings are shot. A compression and leakdown test will confirm that. With bad valve seals, you will see black smoke out of your exhuast.

-Jeff C.</TD></TR></TABLE>

Not always. My old truck would spout out blue smoke only when it started up. I replaced the valve seals and the problem went away.

 

can it have something to do with the crankcase vent or pcv not working properly(in case you still use it with the catch can)?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by _Endless_ &raquo;</TD></TR><TR><TD CLASS="quote">can it have something to do with the crankcase vent or pcv not working properly(in case you still use it with the catch can)?</TD></TR></TABLE>

i don't think so because there is a lot of smoke and forced air coming out of the oil cap and the breather on my catchcan.

I just took the motor apart so I won't be able to do a compression test. I took the head off and was about to do a CRVTEC but i don't want to put that head on there figuring out that the valve seals are bad. Is there anyway to check if the valve seals are bad with the head apart?

 

from what i know, smoke during decceleration usually means valve seal while smoke during acceleration is piston rings.

 

H<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by _Endless_ &raquo;</TD></TR><TR><TD CLASS="quote">from what i know, smoke during decceleration usually means valve seal while smoke during acceleration is piston rings.</TD></TR></TABLE>

Hmm, i wonder how that works because your motor is still spinning (whether or not it's accelerating or decelerating), or I guess the motor is under load that's why it blows out of the rings during acceleration...

 

It's not your valve seals, if it was..you'd see more smoke on startup, and smoke out the exhaust....If you've got the motor apart, stick your head in there and check it out, otherwise do a leakdown testo..my $$ is on rings

 

I have lots of smoke coming out of my oil cap at startup, it's like on instant.

 

Do you burn alot of oil? How often do you touch up & how much do you touch up?

 

ITS THE RINGS VALVES WOULD NOT CAUSE BLOW BY IF VALVES WERE NOT SEATING CAR WOULD HAVE OFF BEAT IDLE
BLOW BY=RINGS LOST SEALVALVE OPOENS PISTON GOES UP COMPRESSION GOES RIGHT THROUGH NON GAPPING RINGS GOES INTO THE CRANKCASE UP THE OIL RETURN LINE UP TO THE HEAD INTO THE VALVE COVER OUT THE BREATHER IN TO THE CATCH CAN 100%ITS THE RINGS

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by punkonnos &raquo;</TD></TR><TR><TD CLASS="quote">ITS THE RINGS VALVES WOULD NOT CAUSE BLOW BY IF VALVES WERE NOT SEATING CAR WOULD HAVE OFF BEAT IDLE
BLOW BY=RINGS LOST SEALVALVE OPOENS PISTON GOES UP COMPRESSION GOES RIGHT THROUGH NON GAPPING RINGS GOES INTO THE CRANKCASE UP THE OIL RETURN LINE UP TO THE HEAD INTO THE VALVE COVER OUT THE BREATHER IN TO THE CATCH CAN 100%ITS THE RINGS</TD></TR></TABLE>

THANKS for the INFO!!!

If there is compression going through the non gapping rings, wouldn't you lose compression and the motor just idle like crap? My idle is fine, still runs hard, but hella smoke and oil pushing through the oil cap and to my catchcan.

I'm just in dying need for info so I can do my CRVTEC and I don't want to throw that head on and find out that i have to redo my valve seals.

 

Valve seals will not cause the crankcase to pressurize. The smoking from the valve seals is from oil running down the valve stem then getting sucked into the cylinder when the engine is started. Even if the valves were not sealing well at the seat, it would just give low compression. It could cause smoking but would not pressurize the crankcase. The valves open directly on those big holes called intake and exhaust ports. Any leak from the valves would much rather go out those big holes rather than find a way into the crankcase.

Pressure in the crankcase is caused by rings, head gasket, crack somewhere or improperly run vent hoses. With the head off, turn the cams so the valves open one cylinder at a time and look at the valve seat area. Does it look clean or burned? Look at the valve stems, are they clean or is there carbon built up on them? Cabon means there is oil getting on them and the seals are bad, clean means the seals are OK.

 

i think you have found your answer!!
Rings 100%
-Bryan-

 

you should do a cylinder leakdown test. That would tell you whats wrong with it.