smoke is bad? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

drewdude92 · 02-16-2009, 03:40 PM

started up my other 71 for a while and drove it then when i pulled back into the driveway there was some smoke coming out of the passenger side valve cover breather. What does that mean im sure its bad. and it has plenty of oil in it

67_C-30 · 02-16-2009, 03:46 PM

Was is doing it while running? Smoke from the valve cover when running is a sign of ring blowby. If it did it after it was cut off, it could be oil from a leak burning off and sometimes condensation evaporating will do that, especially if it has been sitting awhile.

drewdude92 · 02-16-2009, 03:48 PM

i didnt notice as much when it was running just mainly when i shut it off. the truck had been setting for 2 years or so but i just recently got it started up and running good the motor runs real strong still

**El Jay** · 02-16-2009, 03:55 PM

You may want to check your PCV valve. If it's not working the crankcase pressure is going to take "the path of least resistance", which would be out the breather.

A bad PCV valve can also cause oil leaks if the crankcase pressure gets high enough.

**wesmigletz** · 02-16-2009, 03:57 PM

Did your truck reach full operating temp? You may have just had some condesation inside the engine.

67_C-30 · 02-16-2009, 03:57 PM

Quote:

Originally Posted by el jay

you may want to check your pcv valve. If it's not working the crankcase pressure is going to take "the path of least resistance", which would be out the breather.

A bad pcv valve can also cause oil leaks if the crankcase pressure gets high enough.

x2

68_Bowtie · 02-16-2009, 08:10 PM

Just to add to what everyone else has said, if it sat for awhile, it could be a stuck ring. I'd run a compession check.

drewdude92 · 02-16-2009, 08:33 PM

hmm...havent checked the pcv...its if it rattles its good right?

drewdude92 · 02-16-2009, 08:34 PM

and yeah it was at operating temperature

02-16-2009, 03:40 PM	#1
drewdude92 72 chevys 4 life Join Date: Aug 2008 Location: Crescent,Ok Posts: 406	smoke is bad? started up my other 71 for a while and drove it then when i pulled back into the driveway there was some smoke coming out of the passenger side valve cover breather. What does that mean im sure its bad. and it has plenty of oil in it __________________ I dont call it being young and dumb....I call it young and havin fun

02-16-2009, 03:46 PM	#2
67_C-30 I have a radical idea! Join Date: Jan 2005 Location: Sweet Home Alabama! Posts: 6,513	Re: smoke is bad? Was is doing it while running? Smoke from the valve cover when running is a sign of ring blowby. If it did it after it was cut off, it could be oil from a leak burning off and sometimes condensation evaporating will do that, especially if it has been sitting awhile. __________________ '67 C-30 Dually Pickup 6.2 Turbo Diesel, NP435 ‘72 C-10 SWB , 350 4bbl, TH350 '69 C-10 SWB , 250 L6, 3 OTT '69 GMC C3500, dump truck, 351 V6, NP435 '84 M1009 CUCV Military Blazer 67 C-30 Turbodiesel build thread http://67-72chevytrucks.com/vboard/s...d.php?t=254096 My trucks http://s226.photobucket.com/albums/d...ediafilter=all Member of the 1-Ton Club!

02-16-2009, 03:48 PM	#3
drewdude92 72 chevys 4 life Join Date: Aug 2008 Location: Crescent,Ok Posts: 406	Re: smoke is bad? i didnt notice as much when it was running just mainly when i shut it off. the truck had been setting for 2 years or so but i just recently got it started up and running good the motor runs real strong still __________________ I dont call it being young and dumb....I call it young and havin fun

02-16-2009, 03:55 PM	#4
El Jay Gone to greener pastures Join Date: May 2007 Location: Gateway to the Delta Posts: 7,354	Re: smoke is bad? You may want to check your PCV valve. If it's not working the crankcase pressure is going to take "the path of least resistance", which would be out the breather. A bad PCV valve can also cause oil leaks if the crankcase pressure gets high enough. __________________ '69 Chevy 1/2 T LWB Stepper: Daily Beater '72 GMC 3/4 T Fleet: Another Daily Beater '72 Plymouth Gran Coupe: ? "Ah women. They make the highs higher and the lows more frequent." Friedrich Nietzsche "Never kick a fresh turd on a hot day." Harry S. Truman GUN CONTROL: Never having to say, "I missed you." Always fire two warning shots into your attacker's chest area before putting a bullet between his eyes. Paraphrased from Louis Awerbuck

02-16-2009, 03:57 PM	#5
wesmigletz Senior Member Join Date: Feb 2009 Location: Parker, Texas Posts: 685	Re: smoke is bad? Did your truck reach full operating temp? You may have just had some condesation inside the engine. __________________ 1970 2WD K5 1968 Camaro Conv 1967 Chevy SWB 1964 Malibu SS 1957 Corvette Pics www.picturetrail.com/wesmigletz

02-16-2009, 08:10 PM	#7
68_Bowtie Registered User Join Date: Dec 2008 Location: Claremore OK Posts: 52	Re: smoke is bad? Just to add to what everyone else has said, if it sat for awhile, it could be a stuck ring. I'd run a compession check. __________________ 68' SWB 355 CID since 1987 89' S15 4WD 4.3 08' VTX 1300R 08' Chevrolet HHR (Wife's ride) "That man right there is the best sprint car driver in the whole ---damned country!" 1974- Indianapolis- AJ Foyt pointing out Jan Opperman in the garage.

02-16-2009, 08:33 PM	#8
drewdude92 72 chevys 4 life Join Date: Aug 2008 Location: Crescent,Ok Posts: 406	Re: smoke is bad? hmm...havent checked the pcv...its if it rattles its good right? __________________ I dont call it being young and dumb....I call it young and havin fun

02-16-2009, 08:34 PM	#9
drewdude92 72 chevys 4 life Join Date: Aug 2008 Location: Crescent,Ok Posts: 406	Re: smoke is bad? and yeah it was at operating temperature __________________ I dont call it being young and dumb....I call it young and havin fun

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