oily plugs, smoke from right tail pipe - Chevy Nova Forum
Visit our sponsor, National Nostalgic Nova
 
Steve's Nova Site is an automotive enthusiast website dedicated to the 1962 - 1979 Chevrolet Nova, Chevy II and Acadian automobiles. We work together to preserve, restore, drive, show, race and provide fellowship for these classic cars. This is one of the best places to find information about parts, rebuilding, restoration and racing. This website is not affiliated with GM, General Motors or Chevrolet in any capacity.

Go Back   Chevy Nova Forum > Body, Chassis and Mechanical > Drivetrain & Performance


StevesNovaSite.com is the premier Chevrolet Nova Forum on the internet. Registered Users do not see the above ads.
Reply
 
Thread Tools Display Modes
Old 6th-August-2010, 08:09 AM   #1
ChevyBelly
 
ChevyBelly's Avatar

Title: Nova Guru
iTrader: (0)
Status: Offline
Join Date: Mar 2008
Location: CT
Nova(s): 1978
Posts: 810
oily plugs, smoke from right tail pipe

Plugs on the right bank have oil on the threads, but the electrodes are clean with a brownish, tan color. The # 8 electrode is covered bad in carbon/oil mixture. could this be from a leaking valve cover or header gasket? The # 8 plug usually has a slight amount of oil inside the plug boot at the spark plug, and maybe a little spot on the white part of the plug. Plugs are Autolight Platinum AP26. my combo is 350 with 416 305 heads. exact compression is unknown, but im assuming 9:1 at the least. Or is this something bigger like seals? After like 20 miles I get smoke from the right tail pipe. I used cork valve cover gaskets with some RTV

Last edited by ChevyBelly; 6th-August-2010 at 08:25 AM.
  Reply With Quote
Sponsored Links
Advertisement
 
Old 6th-August-2010, 08:50 AM   #2
balljoint
 
balljoint's Avatar

Title: Nova Guru
iTrader: (0)
Status: Offline
Join Date: Aug 2008
Location: colorado
Nova(s): 1978 chevy nova
Posts: 693
pull the valve cover see if oil drain back is plugged
  Reply With Quote
Old 6th-August-2010, 09:03 AM   #3
Paul Wright
 
Paul Wright's Avatar

Title: Nova Guru
iTrader: (0)
Status: Offline
Join Date: Oct 1999
Location: Psychic Hotline
Posts: 8,407
Automatic? Is the vacuum modulator hose connected to the vacuum port on the #8 intake runner? If so, disconnect the hose at the modulator and see if ATF dribbles out. If it does, your modulator diaphragm is cracked.
__________________
Quote:
Originally Posted by Paul Wright
Building a small, high rpm engine
with the perfect bore, stroke and rod ratio is very impressive...
like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar.

Cubic inches is like Indiana Jones with a cheap pistol.
.
  Reply With Quote
Old 6th-August-2010, 11:25 AM   #4
ChevyBelly
 
ChevyBelly's Avatar

Title: Nova Guru
iTrader: (0)
Status: Offline
Join Date: Mar 2008
Location: CT
Nova(s): 1978
Posts: 810
Quote:
Originally Posted by Paul Wright View Post
Automatic? Is the vacuum modulator hose connected to the vacuum port on the #8 intake runner? If so, disconnect the hose at the modulator and see if ATF dribbles out. If it does, your modulator diaphragm is cracked.
auto yes, but its a 200-4R from a mcss, so just the TV cable

Quote:
Originally Posted by balljoint View Post
pull the valve cover see if oil drain back is plugged
are the oil drain backs just holes in the head castings?
  Reply With Quote
Old 6th-August-2010, 01:17 PM   #5
ChevyBelly
 
ChevyBelly's Avatar

Title: Nova Guru
iTrader: (0)
Status: Offline
Join Date: Mar 2008
Location: CT
Nova(s): 1978
Posts: 810
went out at lunch to inspect after the ride into work today. you could see the oil on the outside of the # 8 plug and in the boot cap. the valve covers dont have any signs of oil leakage from what I can see. # 4 has oily threads, but a clean tip...could the oil seals or guides be bad and the oil leaking down the valve, and out the spark plug? Leaving oil on the threads, but the cylinders combustion cleaning the electrodes?
  Reply With Quote
Old 6th-August-2010, 02:23 PM   #6
Lugnut79
 
Lugnut79's Avatar

Title: Nova Guru
iTrader: (0)
Status: Offline
Join Date: Feb 2009
Location: Saratoga, NY
Nova(s): 67 Chevy II
Posts: 1,603
Have the correct plugs in the heads? Gasket or non gasket? Tapered? If that cylinder has some blowby you could get oil on the threads if the wrong plugs are used.
__________________
Camel Humped 355 best, 11.55 @ 116

http://s609.photobucket.com/albums/tt179/Lugnut79/Car/
  Reply With Quote
Old 6th-August-2010, 02:57 PM   #7
grnova
 
grnova's Avatar

Title: Nova Guru
iTrader: (3)
Status: Offline
Join Date: Feb 2004
Location: Crown Point IN
Nova(s): 65 nova
Posts: 556
Check you intake gasket on the bottom, then check you valve heights when valve cover is off. did you have any detonation? Maybe stretch a valve. Here are my spark plugs the right is the pass side. intake gasket on bottom sucked oil from oil valley into heads.



__________________
http://photobucket.com/TimWatson
Tim
  Reply With Quote
Old 6th-August-2010, 03:26 PM   #8
ChevyBelly
 
ChevyBelly's Avatar

Title: Nova Guru
iTrader: (0)
Status: Offline
Join Date: Mar 2008
Location: CT
Nova(s): 1978
Posts: 810
Quote:
Originally Posted by Lugnut79 View Post
Have the correct plugs in the heads? Gasket or non gasket? Tapered? If that cylinder has some blowby you could get oil on the threads if the wrong plugs are used.
Just use what the part store looks up for an 1986 camaro w 305?? I have the 1401416 305 heads. If not, what plugs do you reccomend?

Quote:
Originally Posted by grnova View Post
Check you intake gasket on the bottom, then check you valve heights when valve cover is off. did you have any detonation? Maybe stretch a valve. Here are my spark plugs the right is the pass side. intake gasket on bottom sucked oil from oil valley into heads.

Thanks for the pics. I guess Ill plan for new gaskets all around. Should I replace the valve seals also? Machine shop said my 80's 305 heads should have ftory seals that are better than the umbrella type. He said the oil inside the boot and on the plug indicates an external leak.

I used cork valve cover gaskets with the help of RTV, fel pro (blue) intake manifold gaskets, and these Seal 4 Good header gaskes. The header gaskets are like 2 pieces of metal gasket sandwiched together and are supposed to be reusable. Any reccomendations on which gaskets I should use?

Oh yea, how do I check valve height assuming the cam specs are unknown?
  Reply With Quote
Old 6th-August-2010, 03:42 PM   #9
Paul Wright
 
Paul Wright's Avatar

Title: Nova Guru
iTrader: (0)
Status: Offline
Join Date: Oct 1999
Location: Psychic Hotline
Posts: 8,407
Check the intake bolts around #8 for torque.
__________________
Quote:
Originally Posted by Paul Wright
Building a small, high rpm engine
with the perfect bore, stroke and rod ratio is very impressive...
like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar.

Cubic inches is like Indiana Jones with a cheap pistol.
.
  Reply With Quote
Old 6th-August-2010, 05:28 PM   #10
ronnie smith jr
 
ronnie smith jr's Avatar

Title: Nova Senior Member
iTrader: (3)
Status: Offline
Join Date: May 2010
Location: Maryland
Nova(s): 66 Super Sport
Posts: 343
Chevybelly,

I like the FelPro blue sandwich gaskets for the valvecovers as well. Similar design, as you described with the exhaust but for the valvecovers. Ran them on my superstocker for a couple of years without failure.

Sounds like you may have a little blow by on the valve seals IMO. Some how oil is getting through the combustion chamber into the exhaust if you are seeing smoke "out" of the exhaust. Have you checked/compared your exhaust tail pipe to see if it has an oily film or black carbon deposits different than the driver side?

Just my 2cents.
__________________
Ronnie Smith, Jr.
1966 Chevy II Super Sport
  Reply With Quote
Old 6th-August-2010, 09:40 PM   #11
ChevyBelly
 
ChevyBelly's Avatar

Title: Nova Guru
iTrader: (0)
Status: Offline
Join Date: Mar 2008
Location: CT
Nova(s): 1978
Posts: 810
Quote:
Originally Posted by ronnie smith jr View Post
Chevybelly,

I like the FelPro blue sandwich gaskets for the valvecovers as well. Similar design, as you described with the exhaust but for the valvecovers. Ran them on my superstocker for a couple of years without failure.

Sounds like you may have a little blow by on the valve seals IMO. Some how oil is getting through the combustion chamber into the exhaust if you are seeing smoke "out" of the exhaust. Have you checked/compared your exhaust tail pipe to see if it has an oily film or black carbon deposits different than the driver side?

Just my 2cents.
Hello Ronnie,

I did check the tail pipe when it was smokey and there wass an oil film in the exhaust. I didnt check the other side. I will.

Paul, so the intake bolts could be overtorqued? I couldnt get my torque wrench in the grooves of the intake for all the bolts. I have since picked up a swivel adapter. maybe that will allow me to get proper torque spec. will a compression test will eliminate the rings right?
  Reply With Quote
Old 6th-August-2010, 11:24 PM   #12
Sgt._Grumpy

Title: Nova Junior Member
iTrader: (1)
Status: Offline
Join Date: Mar 2008
Location: Long Island, NY
Nova(s): 65 SS
Posts: 56
Had the same issues quite a few years back, fouled #8 plug and smoke coming from the exhaust on the right side. Made a stupid mistake I overlooked, never installed breathers on the engine. (took a 17 year old kid to point out the problem) Put breathers on both valve covers, problem solved. Could it be your problem?
  Reply With Quote
Old 7th-August-2010, 09:59 AM   #13
ChevyBelly
 
ChevyBelly's Avatar

Title: Nova Guru
iTrader: (0)
Status: Offline
Join Date: Mar 2008
Location: CT
Nova(s): 1978
Posts: 810
Quote:
Originally Posted by Sgt._Grumpy View Post
Had the same issues quite a few years back, fouled #8 plug and smoke coming from the exhaust on the right side. Made a stupid mistake I overlooked, never installed breathers on the engine. (took a 17 year old kid to point out the problem) Put breathers on both valve covers, problem solved. Could it be your problem?
one cover has the pcv valve and the other has a breather, but it probably ancient. try replacing them?
  Reply With Quote
Sponsored Links
Advertisement
 
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Wont start now, oily spark plugs ChevyBelly 4th Generation Nova's 18 18th-April-2009 12:46 PM
no spark and oily plugs ChevyBelly Drivetrain & Performance 21 21st-March-2009 01:07 AM
H pipe X pipe who has what on their car???? Ironcross25 Drivetrain & Performance 21 15th-June-2008 12:17 AM
oily spark plug TRoberts207 Drivetrain & Performance 10 17th-August-2007 06:02 PM
H-pipe hp gain? Will an H-pipe reduce resonnance? druzbabe Drivetrain & Performance 10 29th-June-2007 01:52 PM


Site best viewed set to 1024 x 768.

All times are GMT -4. The time now is 10:00 AM.

Custom Designed for Steve's Nova Site by: vBSkinworks

 
Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Lt

Garage Plus vBulletin Plugins by Drive Thru Online, Inc.