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 1967 - 1972 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


 
 
Thread Tools Display Modes
Prev Previous Post   Next Post Next
Old 10-23-2022, 02:36 PM   #1
guyryan100
Registered User
 
guyryan100's Avatar
 
Join Date: Sep 2001
Location: Cumming, GA
Posts: 483
Sludge in coolant, high pressure

Hi,
I ran my truck for the first time in several years yesterday. Its a crate stock 350 with < 500 miles on it. Yesterday I changed the oil, primed the oil pump, topped off coolant, and ran the engine for about 30 minutes, idling and test driving.

I have 2 issues and I'm not sure if they have the same cause.

Issue 1: Black sludge in the radiator. It is on the cap and everything I can reach with a finger is coated in it.


Issue 2: Black coolant leaking from the water pipe above the thermostat. This black coolant began leaking out almost immediately and at a steady stream. The clamp is very tight. It seemed like that pipe was under very high pressure and very hot, I noticed it almost immediately after startup.


The engine temp reached about 210 when idling. Initially I didn't have my electric fans connected, once I did the engine temp came down but still saw leaks in that location, always black water. But something seemed wrong to me on the cooling system even before I found the sludge. I even checked that my water pump is not running backward (its a stock pump, serpentine belt, turning counter clockwise).

Im sure I have oil in the water, I'm surprised to see a of of this sludge stuff since the engine is new. The oil I just put in was the first oil change. The previous oil had less than 500 miles on it. I saw no sludge in the radiator when I topped it off yesterday.

Also might be relevant, I have not set the timing except by ear. Its close enough that it ran smoothly and quietly but its not dialed in.
guyryan100 is offline   Reply With Quote
 

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 09:23 AM.


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