The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board > The 1973 - 1991 Blazers, Jimmys, and Suburbans Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 05-09-2019, 06:56 PM   #1
eighteenninetytwo
Registered User
 
Join Date: Sep 2013
Location: Redwood city, CA
Posts: 691
Oil leak

Has been leaking a bit for a while but yesterday I was late for something and driving at about 60 so the oil pressure got up there, followed by the oil getting OUT there and smoke in the cabin from burning from landing on hot engine.

leak is apparently from the timing belt cover (I had it check a while back but haven't got round to it but it does need to be done. Is replacing this gasket something that a layman (myself) can do on with the truck on stands with hand tools, or is this a "head to the garage and pay the hourly rate" job??
eighteenninetytwo is offline   Reply With Quote
Old 05-09-2019, 07:56 PM   #2
geezer#99
Registered User
 
geezer#99's Avatar
 
Join Date: Aug 2009
Location: Bowser
Posts: 13,509
Re: Oil leak

Timing cover doesn’t normally leak.
Balancer seal can leak but normally the oil goes down on the oil pan.
There are two bolt holes on the front of the block right by the fuel pump. Oil can be blown out of one of them due to excessive crankcase pressure.
That oil will burn on your exhaust.
Look for those bolts first. If none are present there put two very short bolts in.
If you can take a pic of that area.

There’s some info and a pic in here for you.
http://www.rowand.net/shop/tech/Myst...evyOilLeak.htm
geezer#99 is offline   Reply With Quote
Old 05-10-2019, 05:01 AM   #3
Killer Bee
Registered User
 
Killer Bee's Avatar
 
Join Date: Jan 2016
Location: Barber City, CA
Posts: 4,718
Re: Oil leak

engine model would help but we'll assume SBC.. definitely picture would help too..

also help to know history.. all original? rebuild? any recent work done? etc..

best to degrease and pressure wash engine and look for fresh oil after start up or test drive if small leak..

SBC famous for oil leaks under the intake manifold where it meets the block lifter valley.. front and back btw..

this could run down over timing cover and be wind blown back on exhaust..

one side only or both? rocker cover gaskets leaks are also common on SBC..

these can leak directly onto exhaust manifolds and smoke vigorously as well..

could be combination of more than one gasket failure, especially if all original..

clean, test drive, and post pictures will get you best answers though since oil likes to migrate..

good luck!

here's a picture from internet I pulled down to show you where intake meets block..

he's pointing to a common sealant remedy for common gaskets failure point

__________________
I started out with nothing - and I still have most of it
Killer Bee is offline   Reply With Quote
Reply

Bookmarks

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


All times are GMT -4. The time now is 07:03 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com