oil leak only after freeway driving - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

 
LinkBack Thread Tools Display Modes
post #1 of 14 (permalink) Old May 12th, 02, 05:21 PM Thread Starter
Tech Team
 
Join Date: Apr 2002
Location: tigard oregon usa
Posts: 35
i have replaced rearmain seal,valve covers,oil pan,and front seal. no leaks when sitting,or driving in town on side streets.10 minutes on freeway when i get home their is oil on the bottom of the munice 4 speed,and it looks like it was also on the bell housing.what would leak at high speed but not high rpm? around town. 70 mph 3.5 rpm on freeway. 4 to 5 rpm around town.stock 302 11to1 compression.
68 rs z28 is offline  
Sponsored Links
Advertisement
 
post #2 of 14 (permalink) Old May 12th, 02, 05:42 PM
Senior Tech
John
 
Join Date: Dec 2001
Location: Latonia Kentucky
Posts: 1,693
Check the rear intake manifold seal.

Could it be gear oil from the trans.?
Kyvox is offline  
post #3 of 14 (permalink) Old May 12th, 02, 06:15 PM
Senior Tech
 
Join Date: May 2001
Location: Ashby,MN, USA
Posts: 8,305
if the trans is over filled, oil might come out of the vent in the tranny case, or the front seal might be shot.

------------------
1971 Nova(looks like 69 camaro from underneath!)
355sb, vortec heads, HOT cam,T-10 tranny, 3.70 gears 16X8" IROC wheels. 12" Corvette brakes on the way.
see pics here http://community.webshots.com/user/novaderrik
novaderrik is offline  
 
post #4 of 14 (permalink) Old May 13th, 02, 12:34 AM
Super Moderator
Bess-68's rule
 
Everett#2390's Avatar
 
Join Date: Sep 2000
Location: Va Beach VA
Posts: 31,622
Garage
Muncies always leaked. Mine leaked from the front countershaft bore in the front case. This hole butts against the bell housing, there is no seal for it.

But, if you wipe off the drip and smell it, does it smell like gear lube? Or thinner, like engine oil?

------------------
Everett 68/350/PG/11.90/115mph
Everett#2390 is offline  
post #5 of 14 (permalink) Old May 14th, 02, 09:01 AM
Senior Tech
 
Join Date: May 2001
Location: Austin TX USA
Posts: 501
I'd look at your PCV system...sounds like you have too much crank-case pressure at higher RPM.

Then I'd fix the oil leak created by the above.

If I were a gambling man, I'd put money on the above at even money.


Sleepy-69 is offline  
post #6 of 14 (permalink) Old May 14th, 02, 05:02 PM
Senior Tech
67 Camaros Rock
 
Joe Harrison's Avatar
 
Join Date: Oct 1998
Location: Tucson Arizona
Posts: 7,144
Might want to look and make sure the bolt that plugs the fuel pump push rod hole is plugged 9 has a short bolt in it) if not it weep oil at high RPM and/or speed. You can remove the short bolt in this hole and install a longer one when installing your fuel pump. The longer bolt will hold the push rod up. You have to remove the long bolt and replace it with the short one so your fuel pump push rod will not be bound up. I have seen these bolts missing a number of times and when the hole is plugged the mystery leak disapears.

Joe
Joe Harrison is offline  
post #7 of 14 (permalink) Old May 14th, 02, 05:34 PM
Moderator
David Pozzi
 
davidpozzi's Avatar
 
Join Date: Nov 1999
Location: Central California, USA
Posts: 10,074
My wife just bought a 73RS, the bolt was missing, the oil hit the starter and bellhousing area.
I see the crank keyway didn't get sealed either and is flinging very small amounts of oil from damper hub center.
David

------------------
Check my web page for First Gen Camaro suspension info:
David's Motorsports page
First Gen Suspension Page
67 RS 327 original owner. 69 Camaro Vintage Racer, 65 Lola T-70 Chev SB Can-Am Vintage Racer
davidpozzi is offline  
post #8 of 14 (permalink) Old May 15th, 02, 11:38 AM
Tech Team
 
Join Date: May 2001
Location: Lapeer, Michigan
Posts: 77
I agree with Kyvox that it is very possible that it is sneaking around the rear intake to block seal....if this is it and you decide to pull off the intake use a thick bead of silicone on the front and rear rails instead of the gaskets to seal it for good!
It might also be your mechanical oil pressure gauge line or fitting if it is connected back there too.
Also check your distributor gasket.
Good luck
Nate
eggersn is offline  
post #9 of 14 (permalink) Old May 15th, 02, 05:31 PM
Senior Tech
 
Join Date: Mar 2002
Location: Austin, TX, USA
Posts: 5,277
<BLOCKQUOTE>quote:</font><HR>Originally posted by eggersn:
I agree with Kyvox that it is very possible that it is sneaking around the rear intake to block seal....&lt;snip&gt; use a thick bead of silicone on the front and rear rails &lt;snip&gt;
Good luck
Nate
<HR></BLOCKQUOTE>

Make sure you force some into the crevace between the head and block, then make a proud 1/4" bead on the flat. Allow it to cure for a few minutes before installing the manifold.

-dnult
dnult is offline  
post #10 of 14 (permalink) Old May 16th, 02, 04:07 AM
Senior Tech
 
Join Date: May 2001
Location: Austin TX USA
Posts: 501
I've got two small blocks sitting in my garage and I can't find the bolt to which you are referring (the one near the fuel pump).

There is a threaded hole under the fuel pump, about a 1/2 inch in diameter, that faces down on the outside of the blocks. Is this what you are talking about? Neither are plugged with anything. Should they be?

Or, are you referring to the non-threaded hole in the fuel pump cavity of the block just under the pump rod hole (I don't believe this is to be plugged, but wanted to find out).

[This message has been edited by Sleepy-69 (edited 05-16-2002).]

[This message has been edited by Sleepy-69 (edited 05-16-2002).]
Sleepy-69 is offline  
post #11 of 14 (permalink) Old May 16th, 02, 06:00 AM
Super Moderator
Bess-68's rule
 
Everett#2390's Avatar
 
Join Date: Sep 2000
Location: Va Beach VA
Posts: 31,622
Garage
The hole under the pushrod hole is the drain back to the crankcase. Don't plug this one.

The threaded hole they are talking about is located on the front of the block, pass side, between the timing chain cover and the fuel pump, close to the oil pan rail. You will see two threaded holes vertical to each other. The top hole is the one to be plugged with a short 3/8-16 X 3/4 bolt and thread sealer.

You can also use this threaded hole to put in a longer bolt to clamp the fuel pump rod against its bore, to change out the mechanical fuel pump. Just be sure to remove bolt when done.

------------------
Everett 68/350/PG/11.90/115mph
Everett#2390 is offline  
post #12 of 14 (permalink) Old May 16th, 02, 06:12 AM
Senior Tech
 
Join Date: May 2001
Location: Austin TX USA
Posts: 501
Hmmm...didn't know that.

What is the hole under the fuel pump near the oil pan rail? It faces down...it's a threaded boss, about a 1/2 inch od?
Sleepy-69 is offline  
post #13 of 14 (permalink) Old May 16th, 02, 10:09 AM
Senior Tech
Scott
 
Join Date: Nov 1999
Location: Arroyo Grande/SLO, ca usa
Posts: 598
If it isn't any of the other above stuff mentioned and it is engine oil, then about the only source left would be the soft plug at the rear of the cam is oozing oil. If it is tranny oil, then maybe it is oil leaking past the oil slinger nut at the front bearing retaining flange on the muncie.
bonecrusher67conv is offline  
post #14 of 14 (permalink) Old May 16th, 02, 02:28 PM
Team Member
John
 
JohnZ's Avatar
 
Join Date: Sep 2000
Location: Washington, Michigan USA
Posts: 7,728
The 1/2" hole in the pan rail below the fuel pump (which is not threaded) is a master machining locator - that's one of the points where pins on the precision conveyor pallet located the block during machining operations.

I see quite a few cars with the 3/8"x 3/4" bolt missing from the hole in the front that goes through to the fuel pump pushrod hole, and all of them show oil along the right side of the pan, motormount, starter, bellhousing, transmission, and crossmember.

Those two holes on both sides were there originally for the early passenger car front motormount brackets; the two on the right side weren't used again until the long water pump accessory drive A.I.R. pump bracket used them starting in '69. Without that combination, the through-hole should have a bolt (with thread sealer) in it, or you'll have an oil leak.

------------------
JohnZ
CRG
'69 Z28 Fathom Green
JohnZ is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.



Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may 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
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome