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Oil coming out of filler neck ???

jims427400

Well-known member
Joined
Jun 7, 2005
Messages
763
Location
Temperance Michigan
Corvette
67 427 tripower,68 427 tripower,04 Z16, 62 340hp
I'm looking at a 69 vert ( only a mile from my house) 350/300hp 70k miles original motor,original owner. When he fired it up, he mentioned that it pukes oil out of the oil fill neck. Not really interested yet, he's asking $26,000 and I'm partial to BB but he had all the original documents. What causes this type of problem w/ the oil?? And what is the cure while I'm at it..
 

compyelc4

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Joined
May 1, 2002
Messages
608
Location
Dayton, Ohio
Corvette
'95 LT1 Coupe, Comp Yell; C6 Roadster, Vel Yell
May be too much pressure being created in the block due to piston ring blow-by, due to worn rings.
 

jims427400

Well-known member
Joined
Jun 7, 2005
Messages
763
Location
Temperance Michigan
Corvette
67 427 tripower,68 427 tripower,04 Z16, 62 340hp
Vette79,
hard to say, area was oil soaked and there was like smoking mist coming out from under cap.
Hope that helps.
Worn rings sounds logical.
 

compyelc4

Well-known member
Joined
May 1, 2002
Messages
608
Location
Dayton, Ohio
Corvette
'95 LT1 Coupe, Comp Yell; C6 Roadster, Vel Yell
"Smoking mist" is surely the compression gases blow-by. The little PCV sucks as much out as it can but if excessive..................
 

Vette79

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Joined
Jan 23, 2007
Messages
1,392
Location
Millersville, MD
Corvette
1979 L-48 Black Coupe
Good call compyelc4. And of course not good either so that price should come down somewhat...
 

navy2kcoupe

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Joined
Dec 16, 2006
Messages
799
Location
West Central FL and SE Mass.
Corvette
2000 Navy Blue Coupe A4 Z51
"Smoking mist" is surely the compression gases blow-by. The little PCV sucks as much out as it can but if excessive..................
Maybe the PCV valve is "broke" and not sucking ANYTHING out of there. If it IS, you'll get a lot of oil vapor out of any opening that it can find.
Andy
 

jdp6000

Well-known member
Joined
Aug 23, 2004
Messages
646
Location
Aurora, Ontario, Canada
Corvette
1982 CROSSFIRE
Sounds liek blow by. My 77 did it for a couple of years. The higher the speed the more oil it blew out. Eventually I cracked a cylinder and blew the engine.

Jim
 

jims427400

Well-known member
Joined
Jun 7, 2005
Messages
763
Location
Temperance Michigan
Corvette
67 427 tripower,68 427 tripower,04 Z16, 62 340hp
I didnt thing to give the pvc a shake.. if I go back I'll try that, and go for less money. Need to get the 68 running first, no more geerage space..
 

pws69

Well-known member
Joined
Dec 11, 2002
Messages
94
Location
Massachusetts
I'm looking at a 69 vert ( only a mile from my house) 350/300hp 70k miles original motor,original owner. When he fired it up, he mentioned that it pukes oil out of the oil fill neck. Not really interested yet, he's asking $26,000 and I'm partial to BB but he had all the original documents. What causes this type of problem w/ the oil?? And what is the cure while I'm at it..

"Oil Fill Neck" - on a '69 350 - "original" - hmmm, something is amiss........
 

Victory Red C6

Well-known member
Joined
May 10, 2007
Messages
205
Location
Gibbon, MN
Corvette
2007 Victory Red Coupe
Have to ask. Is the filler cap on?
 

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