D19 oil pump
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=186269
Printed Date: 24 Sep 2025 at 2:00am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: D19 oil pump
Posted By: ditchman24
Subject: D19 oil pump
Date Posted: 06 Feb 2022 at 9:15pm
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I am looking to possibly replace the oil pump in my D19 Diesel. Rebuilt the motor and put new gauges in but still shows lower oil pressure on the gauge. Below normal at idle and mid at WOT. Have no good gauge to verify actual pressure yet. Dose anyone offer a remand pump? Haven’t found much on the internet. Thanks for any info.
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Replies:
Posted By: chuck (WI)
Date Posted: 07 Feb 2022 at 6:38am
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Did you try to adjust the oil pressure relief valve at all
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Posted By: MACK
Date Posted: 07 Feb 2022 at 7:31am
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Those engine normally carry good oil pressure. I would look for Debra under relief valve in block or in oil pump. MACK
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Posted By: DrAllis
Date Posted: 07 Feb 2022 at 7:43am
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The last low oil pressure D-19 diesel I was involved with, was rebuild by someone else who installed -.010" mains or rods on a crankshaft reground to -.020". Oil pressure was just barely decent on a cold start and then kept falling the warmer it got.
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Posted By: ditchman24
Date Posted: 07 Feb 2022 at 9:56am
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Yes I adjusted the relief valve. Bearings are correct. I double checked them. I am going to locate a good oil pressure gauge and double check pressure.
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Posted By: MACK
Date Posted: 07 Feb 2022 at 7:33pm
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There should also be a relief on oil pump. Pull the plunger out of both and check for something under plunger or a bad seat. MACK
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Posted By: tbran
Date Posted: 07 Feb 2022 at 9:32pm
Someone correct me if wrong - but do not those oil pumps have a torque, not bolted up to the block via flange?. Seems like we had one come in after customer overhauled and tab on pump was broke allowing pump to drop down..
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When told "it's not the money,it's the principle", remember, it's always the money..
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Posted By: DrAllis
Date Posted: 07 Feb 2022 at 9:45pm
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Correct. Ear can be broken off the pump easily if overtorqued.
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Posted By: ditchman24
Date Posted: 20 Feb 2022 at 2:09pm
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I got a good gauge hooked up on it today and found the new replacement gauge reads low. I'm not 100% sure what idle pressure is supposed to be but the new gauge confirmed 30+ max throughout throttle range. Book says 25-40.
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