oil from my header - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Silence86 · 12-22-2009, 05:46 PM

ok so lately my truck has been running funny, today i went to change a header gasket and i noticed oil from the front hole where the header is. anyone know what might be causing this? its a mall block 350.

Adams74Chevy · 12-22-2009, 05:57 PM

Quote:

Originally Posted by Silence86

ok so lately my truck has been running funny, today i went to change a header gasket and i noticed oil from the front hole where the header is. anyone know what might be causing this? its a mall block 350.

The oil is in the exhaust port of the head? Just trying to clearify, not be a questioning donkey. I'd check compression on that cylinder too.

Silence86 · 12-22-2009, 06:00 PM

yeah, i have no idea about engines man

Adams74Chevy · 12-22-2009, 06:04 PM

Quote:

Originally Posted by Silence86

yeah, i have no idea about engines man

My mechanical brain has rotted over the past 10 years from not working on vehicles on a regular basis. I'd say it could be head gasket, rings, valve seal, or something else I'm forgetting. Note: I'm not saying it's a definate on any of them but they are the most lively culprits.

Silence86 · 12-22-2009, 06:09 PM

is it expensive?

Adams74Chevy · 12-22-2009, 06:13 PM

It depends on what is the problem. I'm sure there are some others on here that can give better ideas and help troubleshoot it. You may even want to post this in the Engines forum, it may get more reads and info.

Silence86 · 12-22-2009, 06:18 PM

will do thank you

3r!c84 · 12-23-2009, 12:14 AM

do it smoke (white smoke) when you start it up and then stop? or just keep smoking out the tail pipe?

Silence86 · 12-29-2009, 05:45 PM

its smokes when i start it up and when i come to a stop.

qu1cks1lver56 · 12-29-2009, 05:53 PM

id say rings probably

bikes&bowties · 12-29-2009, 05:55 PM

Your piston rings and valve seals are most likely the culprits...

Silence86 · 12-29-2009, 05:56 PM

are they replaceable? sorry, i know nothing about engines and im at a loss. i start school on monday and am hoping to get this resolved by then

68 TT · 12-29-2009, 05:56 PM

So it is the front bolt that attaches the header to the cylinder head that is leaking oil?

These are blind holes so the only way that could happen is to have a cracked cylinder head. Somebody may have put a bolt in there that was too long and tightened the snot out of it trying to get it to seat the header.

You may be able to just put some ultra black or copper RTV on the bolt threads and stop the leak into the headers.

Silence86 · 12-29-2009, 06:00 PM

no not the bolt hole. just the big hole where air flows through the header.

bikes&bowties · 12-29-2009, 06:02 PM

The way I read it. He was talking about oil residue in the exhaust port. And with the way he says it smokes on start up and when its running it makes me think a mixture of valve seals and piston rings.

Silence86 · 12-29-2009, 06:05 PM

which is easier to check? and how do you do this ?

68 TT · 12-29-2009, 06:24 PM

A compression check will be the quickest and easiest test to do.

If all the cylinders are within about 10% of each other then a leak down test is next to see if you have other compression related issues like a damaged ring, piston or valve. If the compression and leak down tests are consistent then it is most likely just bad valve stem seals.

With the age of our trucks you are guaranteed to have old petrified damaged and non-functional valve stem oil seals but the guides themselves may be in decent shape. My truck smoked a little on start up before I changed out the valve stem seals and now it doesn't smoke at all.

Get a set of 16 silicone umbrella style valve stem seals that have springs around the top edge to hold them tight to the valve stem. While you are at it get a set of Z/28 replacement valve springs. They should cost you about $40 out the door for the seals and springs at your local machine shop.

It's not the easiest job to do with the heads on the truck but it can be done.

3r!c84 · 12-29-2009, 09:29 PM

its a valve seal..if it only happens at start up.

Silence86 · 12-29-2009, 09:37 PM

ok any one got any pics of this? or an explanation to to replace?

3r!c84 · 12-29-2009, 09:47 PM

umm no i dont,its in the head what the valve rides into is leaking.its like a .25$ part but a longass time to replace it lol..trying to figur out the new change in this website!!!?

Silence86 · 12-29-2009, 09:49 PM

hahaha dang this sucks. i hope thats it. would this cause it hen im driving to be more sluggish? cause it donmt feel like i have the power i had before i had this problem?

3r!c84 · 12-29-2009, 09:51 PM

no it shouldnt realy change that..i had a atc that would smoke out the garage when i first fire her up.it would only smoke for 2 mins and then run good

Silence86 · 12-29-2009, 10:20 PM

dang. this suck....

, i also hear a tickin coming from inside of my valve cover

3r!c84 · 12-29-2009, 10:21 PM

pull the cover and look for lose rockers

Silence86 · 12-29-2009, 10:22 PM

i wish i had a heated garage.

12-22-2009, 05:46 PM	#1
Silence86 Registered User Join Date: Feb 2009 Location: N. Richland Hills Tx Posts: 229	oil from my header ok so lately my truck has been running funny, today i went to change a header gasket and i noticed oil from the front hole where the header is. anyone know what might be causing this? its a mall block 350. __________________ 1986 gmc sierra....http://67-72chevytrucks.com/vboard/a...hp?albumid=622

12-22-2009, 06:00 PM	#3
Silence86 Registered User Join Date: Feb 2009 Location: N. Richland Hills Tx Posts: 229	Re: oil from my header yeah, i have no idea about engines man __________________ 1986 gmc sierra....http://67-72chevytrucks.com/vboard/a...hp?albumid=622

12-22-2009, 06:09 PM	#5
Silence86 Registered User Join Date: Feb 2009 Location: N. Richland Hills Tx Posts: 229	Re: oil from my header is it expensive? __________________ 1986 gmc sierra....http://67-72chevytrucks.com/vboard/a...hp?albumid=622

12-22-2009, 06:13 PM	#6
Adams74Chevy Registered User Join Date: Mar 2009 Location: MD Posts: 417	Re: oil from my header It depends on what is the problem. I'm sure there are some others on here that can give better ideas and help troubleshoot it. You may even want to post this in the Engines forum, it may get more reads and info. __________________ 2006 Silverado Crew Cab 1500 4x4 5.3L automatic 1986 M1008 CUCV 6.2L Detroit Diesel TH400 4.56 Detroit Locker rear NP208 1973 K20 "Silverado" 350ci, HEI, TH350, NP203 with 2wd conversion, A/C, power windows,tilt wheel, dual tanks. My '73ish K20 thread My 5yo son claims it as his. 1987 V20 Custom Deluxe 350 TH400 NP208 "farm truck" getting parted out. 2016 Nissan Altima grocery getter/commuter

12-22-2009, 06:18 PM	#7
Silence86 Registered User Join Date: Feb 2009 Location: N. Richland Hills Tx Posts: 229	Re: oil from my header will do thank you __________________ 1986 gmc sierra....http://67-72chevytrucks.com/vboard/a...hp?albumid=622

12-23-2009, 12:14 AM	#8
3r!c84 Badass Join Date: Jan 2009 Location: lox. fl Posts: 4,586	Re: oil from my header do it smoke (white smoke) when you start it up and then stop? or just keep smoking out the tail pipe? __________________ Think outside the box? -84c10 (1stcar)→My Build← -00 Saturn 5spd drop a gear and disappear! 1/4:13:90

12-29-2009, 05:45 PM	#9
Silence86 Registered User Join Date: Feb 2009 Location: N. Richland Hills Tx Posts: 229	Re: oil from my header its smokes when i start it up and when i come to a stop. __________________ 1986 gmc sierra....http://67-72chevytrucks.com/vboard/a...hp?albumid=622

12-29-2009, 05:53 PM	#10
qu1cks1lver56 Registered User Join Date: Dec 2009 Location: Milton, FL Posts: 733	Re: oil from my header id say rings probably

12-29-2009, 05:55 PM	#11
bikes&bowties Registered User Join Date: May 2009 Location: Washington Posts: 663	Re: oil from my header Your piston rings and valve seals are most likely the culprits...

12-29-2009, 05:56 PM	#12
Silence86 Registered User Join Date: Feb 2009 Location: N. Richland Hills Tx Posts: 229	Re: oil from my header are they replaceable? sorry, i know nothing about engines and im at a loss. i start school on monday and am hoping to get this resolved by then __________________ 1986 gmc sierra....http://67-72chevytrucks.com/vboard/a...hp?albumid=622

12-29-2009, 05:56 PM	#13
68 TT Still plays with trucks Join Date: Jul 2009 Location: Spokane, WA Posts: 3,556	Re: oil from my header So it is the front bolt that attaches the header to the cylinder head that is leaking oil? These are blind holes so the only way that could happen is to have a cracked cylinder head. Somebody may have put a bolt in there that was too long and tightened the snot out of it trying to get it to seat the header. You may be able to just put some ultra black or copper RTV on the bolt threads and stop the leak into the headers. __________________ miSSed opportunity - ground up creation of an AWD 1994 454 SS that never was http://67-72chevytrucks.com/vboard/s...d.php?t=795577 69 C10 shortbed stepside 400 small block - built like what a super sport truck could have been 69 K20 lwb TBI 350 4L60E NP208 14-bolt Dana-44 w/disc 68 Camaro SS / RS 500hp 439 inch roller cam big block 4L80E 79 Malibu TPI 350 4L60 w/ Z28 steering & sway bars

12-29-2009, 06:00 PM	#14
Silence86 Registered User Join Date: Feb 2009 Location: N. Richland Hills Tx Posts: 229	Re: oil from my header no not the bolt hole. just the big hole where air flows through the header. __________________ 1986 gmc sierra....http://67-72chevytrucks.com/vboard/a...hp?albumid=622

12-29-2009, 06:02 PM	#15
bikes&bowties Registered User Join Date: May 2009 Location: Washington Posts: 663	Re: oil from my header The way I read it. He was talking about oil residue in the exhaust port. And with the way he says it smokes on start up and when its running it makes me think a mixture of valve seals and piston rings.

12-29-2009, 06:05 PM	#16
Silence86 Registered User Join Date: Feb 2009 Location: N. Richland Hills Tx Posts: 229	Re: oil from my header which is easier to check? and how do you do this ? __________________ 1986 gmc sierra....http://67-72chevytrucks.com/vboard/a...hp?albumid=622

12-29-2009, 06:24 PM	#17
68 TT Still plays with trucks Join Date: Jul 2009 Location: Spokane, WA Posts: 3,556	Re: oil from my header A compression check will be the quickest and easiest test to do. If all the cylinders are within about 10% of each other then a leak down test is next to see if you have other compression related issues like a damaged ring, piston or valve. If the compression and leak down tests are consistent then it is most likely just bad valve stem seals. With the age of our trucks you are guaranteed to have old petrified damaged and non-functional valve stem oil seals but the guides themselves may be in decent shape. My truck smoked a little on start up before I changed out the valve stem seals and now it doesn't smoke at all. Get a set of 16 silicone umbrella style valve stem seals that have springs around the top edge to hold them tight to the valve stem. While you are at it get a set of Z/28 replacement valve springs. They should cost you about $40 out the door for the seals and springs at your local machine shop. It's not the easiest job to do with the heads on the truck but it can be done. __________________ miSSed opportunity - ground up creation of an AWD 1994 454 SS that never was http://67-72chevytrucks.com/vboard/s...d.php?t=795577 69 C10 shortbed stepside 400 small block - built like what a super sport truck could have been 69 K20 lwb TBI 350 4L60E NP208 14-bolt Dana-44 w/disc 68 Camaro SS / RS 500hp 439 inch roller cam big block 4L80E 79 Malibu TPI 350 4L60 w/ Z28 steering & sway bars



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12-29-2009, 09:29 PM	#18
3r!c84 Badass Join Date: Jan 2009 Location: lox. fl Posts: 4,586	Re: oil from my header its a valve seal..if it only happens at start up. __________________ Think outside the box? -84c10 (1stcar)→My Build← -00 Saturn 5spd drop a gear and disappear! 1/4:13:90

12-29-2009, 09:37 PM	#19
Silence86 Registered User Join Date: Feb 2009 Location: N. Richland Hills Tx Posts: 229	Re: oil from my header ok any one got any pics of this? or an explanation to to replace? __________________ 1986 gmc sierra....http://67-72chevytrucks.com/vboard/a...hp?albumid=622

12-29-2009, 09:47 PM	#20
3r!c84 Badass Join Date: Jan 2009 Location: lox. fl Posts: 4,586	Re: oil from my header umm no i dont,its in the head what the valve rides into is leaking.its like a .25$ part but a longass time to replace it lol..trying to figur out the new change in this website!!!? __________________ Think outside the box? -84c10 (1stcar)→My Build← -00 Saturn 5spd drop a gear and disappear! 1/4:13:90

12-29-2009, 09:49 PM	#21
Silence86 Registered User Join Date: Feb 2009 Location: N. Richland Hills Tx Posts: 229	Re: oil from my header hahaha dang this sucks. i hope thats it. would this cause it hen im driving to be more sluggish? cause it donmt feel like i have the power i had before i had this problem? __________________ 1986 gmc sierra....http://67-72chevytrucks.com/vboard/a...hp?albumid=622

12-29-2009, 09:51 PM	#22
3r!c84 Badass Join Date: Jan 2009 Location: lox. fl Posts: 4,586	Re: oil from my header no it shouldnt realy change that..i had a atc that would smoke out the garage when i first fire her up.it would only smoke for 2 mins and then run good __________________ Think outside the box? -84c10 (1stcar)→My Build← -00 Saturn 5spd drop a gear and disappear! 1/4:13:90

12-29-2009, 10:20 PM	#23
Silence86 Registered User Join Date: Feb 2009 Location: N. Richland Hills Tx Posts: 229	Re: oil from my header dang. this suck.... , i also hear a tickin coming from inside of my valve cover __________________ 1986 gmc sierra....http://67-72chevytrucks.com/vboard/a...hp?albumid=622

12-29-2009, 10:21 PM	#24
3r!c84 Badass Join Date: Jan 2009 Location: lox. fl Posts: 4,586	Re: oil from my header pull the cover and look for lose rockers __________________ Think outside the box? -84c10 (1stcar)→My Build← -00 Saturn 5spd drop a gear and disappear! 1/4:13:90

12-29-2009, 10:22 PM	#25
Silence86 Registered User Join Date: Feb 2009 Location: N. Richland Hills Tx Posts: 229	Re: oil from my header i wish i had a heated garage. __________________ 1986 gmc sierra....http://67-72chevytrucks.com/vboard/a...hp?albumid=622

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