smoke coming from oil filler - The 1947 - Present Chevrolet & GMC Truck Message Board Network

camaney · 02-04-2011, 11:20 PM

hi on my 67 350 there is smoke coming from oil filler & a little oil. do i need a rebuild, rings or head work? diffent kind of oil? the truck runs great is just the smoke is bothering me I only notice the smoke when I open the hood

DaSchlange · 02-05-2011, 04:49 AM

Kind of odd, how often do you drive the truck?

JimKshortstep4x4 · 02-05-2011, 06:35 AM

Make sure that your PCV valve is functioning properly and that the vacuum line is not plugged.

Jim

ls1nova71 · 02-05-2011, 08:59 AM

My guess is this is going to turn out to be a leaking valve cover that is leaking onto the exhaust. Never seen an oil filter get so hot it would smoke.
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OhioDan · 02-05-2011, 09:12 AM

With the smoke coming out with some oil, sounds like you maybe gonna have a rebuild in your future? Just my $.02.

geezer#99 · 02-05-2011, 10:28 AM

It's called blowby. Your rings are going away. All motors have a little blowby. A good pvc system will help reduce it.

Lee H · 02-05-2011, 11:03 AM

Geezer is right on. What weight oil are you running? Do you have a PVC hooked up. The PVC will not reduce the amount of blow by but will send it back to the motor to be burned VS letting it go into the atmosphere. If it's running good and still has power I'd switch to some heavier weight oil to buy you some time. Watch your oil consumption. If your only going through a quart or so between changes then no worries. In Cali I would not hesitate to use some 20-50 in that thing.

camaney · 02-05-2011, 12:07 PM

Quote:

Originally Posted by ls1nova71

My guess is this is going to turn out to be a leaking valve cover that is leaking onto the exhaust. Never seen an oil filter get so hot it would smoke.
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FILLER not filter thanks guys I'll be checking the pcv & hose i don't drive it that often is been off the road for same years I have been rebuilding it for son
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ls1nova71 · 02-05-2011, 12:46 PM

Quote:

Originally Posted by camaney

FILLER not filter thanks guys I'll be checking the pcv & hose i don't drive it that often is been off the road for same years I have been rebuilding it for son
Posted via Mobile Device

Oops, my bad. The screen on my phone is way too small sometimes!

camaney · 02-05-2011, 03:37 PM

ok so the pcv works good. what's the numbers on compression test? the truck has been off the road for a least 10 years that I know.

Lee H · 02-05-2011, 04:16 PM

The numbers are not so important as the consistany between the cylinders. You'll want the high and low to be within 10% or so of each other. While a compression test will give you some indicators, a leak down test will pin point exactly what's going on with your engine.

camaney · 02-05-2011, 07:03 PM

Ok. so i did the compression test & this is what I have 1-150 2-150 3-80 4-135 5-145 6-150 7-150 8-040 that wet and dry testing no change at all what do you think

jay6891 · 02-05-2011, 08:37 PM

If your readings are correct. Number 3 and 8 have either a burnt valve or bad ring set in them. My 2 cents. Drive it till it quits, or you get tired of putting oil in it. Whatever comes first. Most of all, have fun with it, might be a chance to do a little upgrade on the drive train.

cableguy0 · 02-05-2011, 08:49 PM

I think your engine needs a rebuild. #3 and #8 are definately your problem. most likely stuck rings. You could try some marvel mystery oil or some other similar product. With the engine sitting for that long thats the most likely cause. From the compression numbers the rest of the engine looks fairly healthy. I would try a few of the miracles in a bottle and then just yank it out and start over.

camaney · 02-07-2011, 04:38 PM

Thanks every one I'll be using one of those bottle thingys & see how far I can go like this
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02-04-2011, 11:20 PM	#1
camaney Registered User Join Date: Feb 2008 Location: sacramento california Posts: 204	smoke coming from oil filler hi on my 67 350 there is smoke coming from oil filler & a little oil. do i need a rebuild, rings or head work? diffent kind of oil? the truck runs great is just the smoke is bothering me I only notice the smoke when I open the hood

02-05-2011, 04:49 AM	#2
DaSchlange Registered User Join Date: Sep 2010 Location: Gainesville, MO Posts: 251	Re: smoke coming from oil filler Kind of odd, how often do you drive the truck?

02-05-2011, 08:59 AM	#4
ls1nova71 Registered User Join Date: Dec 2009 Location: Independence Mo Posts: 4,119	Re: smoke coming from oil filler My guess is this is going to turn out to be a leaking valve cover that is leaking onto the exhaust. Never seen an oil filter get so hot it would smoke. Posted via Mobile Device

02-05-2011, 09:12 AM	#5
OhioDan Registered User Join Date: Apr 2002 Location: New Carlisle, Ohio,USA Posts: 1,404	Re: smoke coming from oil filler With the smoke coming out with some oil, sounds like you maybe gonna have a rebuild in your future? Just my $.02. __________________ LIFE AIN'T EASY WHEN YER FAT AND GREASY! GMC= Got More Class! 1970 GMC LWB, Fleetside, 350/4spd, Flowmaster "40's", 2002 GMC 16" Rallies, cowl hood,and added a bunch of options that weren't there when I started.

02-05-2011, 10:28 AM	#6
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,736	Re: smoke coming from oil filler It's called blowby. Your rings are going away. All motors have a little blowby. A good pvc system will help reduce it.

02-05-2011, 06:35 AM	#3
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: smoke coming from oil filler Make sure that your PCV valve is functioning properly and that the vacuum line is not plugged. Jim __________________ 1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC

02-05-2011, 11:03 AM	#7
Lee H Registered User Join Date: Jun 2010 Location: Upland Ca Posts: 4,147	Re: smoke coming from oil filler Geezer is right on. What weight oil are you running? Do you have a PVC hooked up. The PVC will not reduce the amount of blow by but will send it back to the motor to be burned VS letting it go into the atmosphere. If it's running good and still has power I'd switch to some heavier weight oil to buy you some time. Watch your oil consumption. If your only going through a quart or so between changes then no worries. In Cali I would not hesitate to use some 20-50 in that thing. __________________ 1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703

02-05-2011, 03:37 PM	#10
camaney Registered User Join Date: Feb 2008 Location: sacramento california Posts: 204	Re: smoke coming from oil filler ok so the pcv works good. what's the numbers on compression test? the truck has been off the road for a least 10 years that I know.

02-05-2011, 04:16 PM	#11
Lee H Registered User Join Date: Jun 2010 Location: Upland Ca Posts: 4,147	Re: smoke coming from oil filler The numbers are not so important as the consistany between the cylinders. You'll want the high and low to be within 10% or so of each other. While a compression test will give you some indicators, a leak down test will pin point exactly what's going on with your engine. __________________ 1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703

02-05-2011, 07:03 PM	#12
camaney Registered User Join Date: Feb 2008 Location: sacramento california Posts: 204	Re: smoke coming from oil filler Ok. so i did the compression test & this is what I have 1-150 2-150 3-80 4-135 5-145 6-150 7-150 8-040 that wet and dry testing no change at all what do you think

02-05-2011, 08:37 PM	#13
jay6891 Car Knocker Join Date: May 2001 Location: jefferson,arkansas Posts: 664	Re: smoke coming from oil filler If your readings are correct. Number 3 and 8 have either a burnt valve or bad ring set in them. My 2 cents. Drive it till it quits, or you get tired of putting oil in it. Whatever comes first. Most of all, have fun with it, might be a chance to do a little upgrade on the drive train. __________________ 68 c-10,91 sportside bed,350 .030 over,4 bolt,10-1 comp,2.05 intake/1.94 exhaust,1.6 Harland Sharp roller rockers,edelbrock rpm cam and intake w/750 carb, 700r4, 3.73 gears,Jacabbs Electronic Igntion w/Accel HEI distributer and super coil. ZR-1 roll pan, filled tailights. Blazer tank. Hidden hitch. 2 1/2" Flowmaster 40's. Parts bought but not installed>> ford 9" posi with disc. CCP front and rear lowering kit 4/5. Cab corners,foor boards,rockers, cab braces, Phatom grill, Painless wiring kit.

02-05-2011, 08:49 PM	#14
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,948	Re: smoke coming from oil filler I think your engine needs a rebuild. #3 and #8 are definately your problem. most likely stuck rings. You could try some marvel mystery oil or some other similar product. With the engine sitting for that long thats the most likely cause. From the compression numbers the rest of the engine looks fairly healthy. I would try a few of the miracles in a bottle and then just yank it out and start over. __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

02-07-2011, 04:38 PM	#15
camaney Registered User Join Date: Feb 2008 Location: sacramento california Posts: 204	Re: smoke coming from oil filler Thanks every one I'll be using one of those bottle thingys & see how far I can go like this Posted via Mobile Device



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