Farm Equipment - AC 8550

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AC 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=27405
Printed Date: 27 Feb 2025 at 5:08pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: AC 8550

Posted By: AC8030
Subject: AC 8550
Date Posted: 16 Mar 2011 at 5:16pm

we just pulled the injection pump off of our 8550 and might have it rebuilt. Is there anything we should have them do to it? I've heard about lowering the rpm's but i wasn't sure about it.

Replies:

Posted By: BLee Mn
Date Posted: 16 Mar 2011 at 6:31pm

what i did with mine was increase fuel flow and decrease rpm to 2300

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Cowboy UP

Posted By: plowboy8550
Date Posted: 16 Mar 2011 at 8:25pm

You hit the nail on the head Bump up the fuel a tad and decrease rpms. U will have more power and U wont even notice the slight drop in rpms.. Just dont get to crazy with the fuel we have had alot of troubles with the drop boxes.

Posted By: 427435
Date Posted: 16 Mar 2011 at 11:22pm

The engine (especially the valve train) will be a lot happier at a reduced RPM. Have the injection shop look up the specs for the 4w-305 and have it set to that.

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Mark

B10 Allis, 917 Allis, 7116 Simplicity, 7790 Simplicity Diesel,
GTH-L Simplicity

Ignorance is curable-----stupidity is not.