 
Main Menu
|
|
Nevada Classics
|
|
Advertise at CC
|
| S |
M |
T |
W |
T |
F |
S |
| 1 |
2 |
3 |
4 |
5 |
6 |
7 |
| 8 |
9 |
10 |
11 |
12 |
13 |
14 |
| 15 |
16 |
17 |
18 |
19 |
20 |
21 |
| 22 |
23 |
24 |
25 |
26 |
27 |
28 |
| 29 |
30 |
31 |
|
|
|
|
|
|
CC Advertisers
|
|
 1Likes
-
1
Post By Sledge
12-18-2021, 09:10 AM
|
|
CC Member
|
|
|
Join Date: Apr 2004
Location: Long Beach,
CA
Cobra Make, Engine: BDR #168 427W 66+K miles and counting
Posts: 338
|
|
Not Ranked
SBF Cyl Head Oil Return
I understand that oil gets to the valve springs, rocker arms, etc. via the pushrods. How does this oil get drained back into the valley or crankcase? That oil has got to go somewhere.
It appears that there are drain holes, one at each end, near the valve springs, but then I am told there is no oil path through the cylinder heads. I'm chasing a leak and even with dye I haven't found the source yet. It isn't the valve covers or the china walls, there is no oil leaking above the exhaust ports.
Dart block, AFR heads.
__________________
Bill
"If your work speaks for itself, don't interrupt"
Last edited by Sledge; 12-18-2021 at 09:10 AM..
Reason: spelling
|
12-20-2021, 09:24 AM
|
 |
CC Member
|
|
|
Join Date: Feb 2007
Location: Colorado Springs,
CO
Cobra Make, Engine: Backdraft, supercharged Coyote
Posts: 2,445
|
|
Not Ranked
The oil drains back through those holes at the end, and there is an oil passage there in the block. It also drains back through the push rod holes.
Take the car to a shop that has a smoke machine. Where the smoke leaks out is where the oil is leaking from.
__________________
.boB "Iron Man"
NASA Rocky Mountain TTU #42
www.RacingtheExocet.com
BDR #1642 - Supercharged Coyote, 6 speed Auto
Last edited by bobcowan; 12-20-2021 at 09:34 AM..
|
12-20-2021, 04:15 PM
|
 |
CC Member
|
|
|
Join Date: May 2008
Location: Brisbane,
QLD
Cobra Make, Engine:
Posts: 2,797
|
|
Not Ranked
If the lower drains were not functional, the heads would fill up until the pushrod holes became the main drain holes.
How much oil in the valve spring area when you remove a valve cover?
__________________
Gary
Gold Certified Holden Technician
|
12-21-2021, 08:51 AM
|
|
CC Member
|
|
|
Join Date: Apr 2004
Location: Long Beach,
CA
Cobra Make, Engine: BDR #168 427W 66+K miles and counting
Posts: 338
|
|
Not Ranked
Thank you Bob and Gary. Bob, you confirmed what I suspected but could find no diagram or written reference on the 'net. Good idea in re using smoke to pinpoint the leaks. Gary, when I remove the valve covers there is only a very little oil between the springs and the head's valve cover gasket lip.
Thank you guys for responding, and Bob, those pictures are perfect.
__________________
Bill
"If your work speaks for itself, don't interrupt"
|
12-22-2021, 04:55 AM
|
|
CC Member
|
|
|
Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
|
|
Not Ranked
Quote:
Originally Posted by Sledge
I understand that oil gets to the valve springs, rocker arms, etc. via the pushrods. How does this oil get drained back into the valley or crankcase? That oil has got to go somewhere.
It appears that there are drain holes, one at each end, near the valve springs, but then I am told there is no oil path through the cylinder heads. I'm chasing a leak and even with dye I haven't found the source yet. It isn't the valve covers or the china walls, there is no oil leaking above the exhaust ports.
Dart block, AFR heads.
|
Depending on the head gasket used, some guys forget that the head gasket doesn't come up all the way to the china wall and it leaves a gap. On some head gaskets, you have to put a dab of silicone under the head before you bolt the head on. That's an easy place for leaks to generate. |
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
All times are GMT -7. The time now is 04:00 PM.
Links monetized by VigLink
|
Linear Mode
