Farm Equipment - Oil pressure 8550

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Oil pressure 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=51935
Printed Date: 14 Sep 2025 at 6:34am
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Topic: Oil pressure 8550

Posted By: Dale
Subject: Oil pressure 8550
Date Posted: 11 Jun 2012 at 4:07pm

Anyone know what range the oil pressure (in lbs) should be for a 8550?

Replies:

Posted By: Unit3
Date Posted: 11 Jun 2012 at 5:56pm

No I don't, but I do know that it is a GREAT IDEA to run the 8550 or 4W305 with the valve covers off in the shop so you can see 1st hand how much oil is coming out of the rocker arms. This run off oil is the only oil the push rods, adjusting screws, and cam lobs will see. We learned the hard way that oil pressure DOES NOT mean oil volume.

Posted By: CAL(KS)
Date Posted: 11 Jun 2012 at 6:08pm

both 8550's dad has run about 45lbs all the time. my HD16 which basically has an early version of the engine design is supposed to run 30-50 lbs

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Me -C,U,UC,WC,WD45,190XT,TL-12,145T,HD6G,HD16,HD20

Dad- WD, D17D, D19D, RT100A, 7020, 7080,7580, 2-8550's, 2-S77, HD15