CorvetteForum - Chevrolet Corvette Forum Discussion

C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
Sponsored by:
Sponsored by:

76 BB blowing oil

Thread Tools
 
Search this Thread
 
Old Sep 28, 2011 | 01:20 PM
Share
  #1  
calvette 11's Avatar
calvette 11
Thread Starter
Racer
Supporting Member
20 Year Member
Conversation Starter
All Eyes On Me
Liked
 
Joined: Feb 2005
Posts: 374
Likes: 4
From: decatur ga
Default 76 BB blowing oil
I drove my car today.After a short distance I saw smoke.I pulled over
oil had blown out the breather cap in the valve cover,on the passenger side..I was not a lot,but visable.What
could it be?Blown head gasket,broken rings?The car strong ,I pushed it up to 7000.No smoke out the pipes.

open for suggestions
Reply
0
Old Sep 28, 2011 | 01:23 PM
Share
  #2  
MelWff's Avatar
MelWff
Race Director
20 Year Member
Liked
Loved
Community Favorite
 
Joined: May 2006
Posts: 18,710
Likes: 2,574
Default
Any chance the oil is overfilled? Do you have a working PCV system?
Reply
0
Old Sep 28, 2011 | 01:28 PM
Share
  #3  
calvette 11's Avatar
calvette 11
Thread Starter
Racer
Supporting Member
20 Year Member
Conversation Starter
All Eyes On Me
Liked
 
Joined: Feb 2005
Posts: 374
Likes: 4
From: decatur ga
Default pcv valve
Originally Posted by MelWff
Any chance the oil is overfilled? Do you have a working PCV system?
PCV valve in the other valve cover
Reply
0
Old Sep 28, 2011 | 01:39 PM
Share
  #4  
billla's Avatar
billla
Le Mans Master
Supporting Lifetime
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Jun 2004
Posts: 6,231
Likes: 65
From: Seattle WA
St. Jude Donor '14
Default
PCV valve first check, then on to a compression/leak-down test.
Reply
0
Old Sep 28, 2011 | 04:10 PM
Share
  #5  
calvette 11's Avatar
calvette 11
Thread Starter
Racer
Supporting Member
20 Year Member
Conversation Starter
All Eyes On Me
Liked
 
Joined: Feb 2005
Posts: 374
Likes: 4
From: decatur ga
Default pcv valve
Originally Posted by billla
PCV valve first check, then on to a compression/leak-down test.
The PCV valve is not closed.I will try the compression test,tomorrow

I will advise
Reply
0
Old Sep 29, 2011 | 09:13 PM
Share
  #6  
calvette 11's Avatar
calvette 11
Thread Starter
Racer
Supporting Member
20 Year Member
Conversation Starter
All Eyes On Me
Liked
 
Joined: Feb 2005
Posts: 374
Likes: 4
From: decatur ga
Default blowing oil
Originally Posted by billla
PCV valve first check, then on to a compression/leak-down test.
1 190
3 190
5 190
7 195

2 185
4 195
6 185
8 185

Each cylinder i put 120 pounds of air I did not hear leaking and it held
Reply
0
Old Sep 30, 2011 | 12:48 PM
Share
  #7  
73, Dark Blue 454's Avatar
73, Dark Blue 454
Melting Slicks
10 Year Member
 
Joined: Mar 2005
Posts: 2,838
Likes: 10
From: Austin TX
Default
Better describe your problem,.."blowing oil". From where is the smoke coming?...oil leaking from the breather down to the exhaust manifolds or pipes?
Reply
0
Old Sep 30, 2011 | 01:14 PM
Share
  #8  
Manuel Azevedo's Avatar
Manuel Azevedo
Burning Brakes
 
Joined: Jan 2007
Posts: 1,057
Likes: 4
From: Concord Calif
Default
A little more info needed. like stock or after market valve covers. meaning you may have a non baffeled breather hole in the valve cover.
Reply
0
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

 Joe Kucinski
story-1

How Much Horsepower Every Corvette Engine "LOST" in 1972

 Joe Kucinski
story-2

Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

 Michael S. Palmer
story-3

Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

 Joe Kucinski
story-4

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

 Joe Kucinski
story-5

8 Coolest Corvette Pace Cars (and Replicas) of All Time

 Verdad Gallardo
story-6

Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

 Joe Kucinski
story-7

Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

 Verdad Gallardo
story-8

Top 10 Corvettes Coming to Mecum Indy 2026!

 Brett Foote
story-9

Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

 Michael S. Palmer
Old Sep 30, 2011 | 02:16 PM
Share
  #9  
Easy Mike's Avatar
Easy Mike
Team Owner
Supporting Lifetime
20 Year Member
 
Joined: Jun 2000
Posts: 38,923
Likes: 1,481
From: Southbound
Cruise-In II Veteran
Default
There are no "breather caps" on stock valve covers. What are you running?

Reply
0
Old Sep 30, 2011 | 06:52 PM
Share
  #10  
calvette 11's Avatar
calvette 11
Thread Starter
Racer
Supporting Member
20 Year Member
Conversation Starter
All Eyes On Me
Liked
 
Joined: Feb 2005
Posts: 374
Likes: 4
From: decatur ga
Default oil leak
Originally Posted by Manuel Azevedo
A little more info needed. like stock or after market valve covers. meaning you may have a non baffeled breather hole in the valve cover.
Tall non stock valve covers.mine has a baffled breather hole.I even put steel wool in it,thinking it would help stop the oil from comming,under hard acceleration.
Reply
0
Old Sep 30, 2011 | 08:23 PM
Share
  #11  
Indiancreek's Avatar
Indiancreek
Drifting
Supporting Member
15 Year Member
Conversation Starter
All Eyes On Me
Liked
 
Joined: Jun 2010
Posts: 1,781
Likes: 15
From: Oxford Ohio
Default
Auto trans? Check the oil level. See if it's over full. If it has an auto trans your vaccume valve can go bad and pump trans oil into your engine ans cause smoke and way over full with oil.
Next I'd pull the valve cover that is full and se if the oil return is clogged and filling up while driving.
Just two gesses without more information. If it is the trans, you'll have a very clean block when it's done.
Reply
0

Get notified of new replies

To 76 BB blowing oil

Tags
Back to Subforum
C3 Tech/Performance
View Next Unread
Willcox Summer Sale Inclds: Interiors, Weatherstrips, Carpet and 10% off Still On!




Click for Advanced Search
Reply Closed Thread Share
Forum Jump
Trending Topics

All times are GMT -4. The time now is 10:38 AM.

story-0
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Slideshow: 10 reasons why the C6 Z06 is still a performance benchmark after 20 years.

By Joe Kucinski | 2026-05-27 17:20:09


VIEW MORE
story-1
How Much Horsepower Every Corvette Engine "LOST" in 1972

Slideshow: How much horsepower every Corvette engine lost in 1972.

By Joe Kucinski | 2026-05-27 16:54:53


VIEW MORE
story-2
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-3
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-4
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-5
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE
story-6
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

Slideshow: Ranking the top 10 Corvette engines by torque output.

By Joe Kucinski | 2026-05-05 11:58:09


VIEW MORE
story-7
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

Slideshow: A Corvette pace car nearly matching IndyCar speeds sounds exaggerated, until you look at the numbers.

By Verdad Gallardo | 2026-05-04 20:03:36


VIEW MORE
story-8
Top 10 Corvettes Coming to Mecum Indy 2026!

Among a rather large group of them.

By Brett Foote | 2026-05-04 13:56:44


VIEW MORE
story-9
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

Slideshow: the top 10 things Corvette owners want in the C9 Corvette

By Michael S. Palmer | 2026-04-30 12:41:15


VIEW MORE