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8550

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=174532
Printed Date: 26 Apr 2024 at 9:33pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: 8550

Posted By: Dale
Subject: 8550
Date Posted: 19 Sep 2020 at 5:07pm

Started the 8550 today.

Within minutes coolant was coming out the filler cap overflow tube. Coolant wasn't even hot. Unscrewed the cap no burst of pressure just coolant gushing out. Haven't overfilled coolant.

Engine runs fine. Have an oil pressure gauge and pressure reads about 50 which is what it usually reads.

What's going on?

Replies:

Posted By: DougG
Date Posted: 19 Sep 2020 at 7:36pm

Sounds like something is pressurizing the coolant passage,,

Posted By: Ron(AB)
Date Posted: 20 Sep 2020 at 12:03am

Maybe a crack in the solder around overflow tube?

Posted By: Dale
Date Posted: 20 Sep 2020 at 6:08am

A crack in the tube shouldn't cause coolant to be pushed out when the coolant hasn't even warmed up yet.

I'm getting pressure from somewhere, but where?

Posted By: Amos
Date Posted: 20 Sep 2020 at 6:53am

Head gasket leaking compression into the coolant passages....or a cracked head....either way the worst part of fixing that is lifting that hood off, it is not light!

Posted By: JPG AUSTRALIA
Date Posted: 21 Sep 2020 at 12:33am

No oil in the water? Just in case it might be oil cooler pressuring the radiator

Posted By: Boss Man
Date Posted: 21 Sep 2020 at 4:54pm

Not familiar with a 8550. Does it have injector sleeves otherwise known as coppers? If they lose their seal to the head the compression goes straight into the cooling system.

Posted By: Amos
Date Posted: 21 Sep 2020 at 9:23pm

Bossman it does not have the copper sleeves.