Allis Chalmers HD5
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Construction and other equipment
Forum Description: everything else with orange (or yellow) paint
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=88933
Printed Date: 29 Jun 2025 at 10:27am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Allis Chalmers HD5
Posted By: bulldog
Subject: Allis Chalmers HD5
Date Posted: 01 May 2014 at 11:51am
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A friend has a HD 5 with low oil pressure,all bearings have been renewed, is there a oil pressure adjustment ? what is the correct pressure, its 15 psi now Thanks Martyn
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Replies:
Posted By: JC-WI
Date Posted: 01 May 2014 at 12:15pm
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Was it 15 psi before the new bearings? ------------- He who says there is no evil has already deceived himself The truth is the truth, sugar coated or not. Trawler II says, "Remember that." |
Posted By: bulldog
Date Posted: 01 May 2014 at 12:30pm
| Its alway been low , what is the correct pressure ? |
Posted By: bulldog
Date Posted: 01 May 2014 at 12:33pm
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He has recently got the machine and had someone to work on it.15 psi seems low to me. I wondered if there was a pressure relief valve or any adjustmen to increase presure ? or perhaps the oil pump is at fault.He has no manual to work to. Thanks Martyn
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Posted By: Coke-in-MN
Date Posted: 01 May 2014 at 12:55pm
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new bearings will not make up for worn cam bearings or worn crank - to much clearance and low oil pressure results. ------------- Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something. "Challenges are what make life interesting; overcoming them is what makes life meaningful." |
Posted By: Matt (Jordan,MN)
Date Posted: 01 May 2014 at 1:11pm
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Had the same problem. We replaced the cam & balance shaft bearings and had the bearing surfaces on the shaft welded up. It fixed the problem. ------------- Owner of Matt Scott LLC Specializing in NOS and used Allis Chalmers tractor & implement parts & liturature and Magneto Repair http://www.mattscottllc.com/ |
Posted By: Coke-in-MN
Date Posted: 01 May 2014 at 1:56pm
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When I bought my 5G - the seller told me he had just replaced the rod and main bearings but had light oil in it and pressure was low - well I changed oil and still low so i replaced the oil pump - still low - but operable - pressure dropped at idle but would come up to 30 PSI at 1800 RPM or so . Couple years later I developed a oil leak at rear main - tore down and found crank was worn - had ground and new bearings as well as new pistons and sleeves , oil pressure came up 45 PSI . Couple years later replaced the head as one valve seat burnt and came loose . Also had small cracks to injector sleeve (a normal thing I found out later) and engine runs great yet 15 years later . Dang just counting I have owned the machine for over 35 years now - and it still runs.
------------- Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something. "Challenges are what make life interesting; overcoming them is what makes life meaningful." |
Posted By: Coke-in-MN
Date Posted: 01 May 2014 at 2:03pm
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I have a photocopy of HD5 manual I will sell if your friend wants one ------------- Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something. "Challenges are what make life interesting; overcoming them is what makes life meaningful." |
Posted By: Ray54
Date Posted: 01 May 2014 at 10:52pm
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Make sure it is not putting diesel in the crankcase.Detroits are known to have the fuel lines on top of the head start leaking around the fitting,but do not over tighten as that will make it leak more.They used to be cheap and just change them if there was any sign of oil being thinned with diesel.Don't know how parts are as DD as a company has had many owners in the last 20 years.And greenies don't like the 2 cycle diesel.I have seen this several times and much cheaper than new bearings.Good luck. |
Posted By: bulldog
Date Posted: 02 May 2014 at 11:01am
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Saw the machine today as it shared a lowboy with my D4 enroute to a vintage show, seems to run OK. Will have a closer look at the machine on Saturday. Thanks for your help.
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Posted By: Coke-in-MN
Date Posted: 02 May 2014 at 11:59am
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Yes if you do any injector work or anything in that top end WATCH the injector lines . 15 inch pounds torque on line nut . double flare fitting and they will crack just behind flare thinning oil and dropping pressure . ------------- Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something. "Challenges are what make life interesting; overcoming them is what makes life meaningful." |
Posted By: chumduffy
Date Posted: 02 May 2014 at 3:35pm
I would buy your manual Coke, just let me know how much you need for it and where to send you a check. Thanks', Chum.. |
Coke-in-MN wrote: