D-15 175 engine
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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=46894
Printed Date: 29 Aug 2025 at 8:39pm
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Topic: D-15 175 engine
Posted By: loyalorange
Subject: D-15 175 engine
Date Posted: 08 Mar 2012 at 4:25pm
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Newby here members, I'm looking for he torque sequence for this engine. A few years (10 or 12), we tore it down, redone the top end and now wondering if the head required a re-torque after so many hours. Runs fine but have to pull it halfway to Chicago to get it to fire. Injectors were rebuilt at that time also. Thanks much. Bill
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Replies:
Posted By: D17countryboy
Date Posted: 08 Mar 2012 at 6:23pm
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I don't think that the torque of the head has anything to do with it not wanting to fire up easy expecially being the head job was done so many years ago. Have you tried using starting fluid? I know with my D-17 262 diesel since it was brand new we always have to use starting fluid to get it to start easy otherwise it will just sit there and crank forever before it will fire up and run.
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Posted By: loyalorange
Date Posted: 08 Mar 2012 at 7:46pm
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Yes, it has an addiction to either. Dosen't help much though.
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Posted By: Ian
Date Posted: 08 Mar 2012 at 8:39pm
Not to familiar with how these are timed, by that I mean I don't know if the pump pulley is pressed on or bolted, but slipped timing can cause hard starting. also air in the fuel supply line.
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1980 AC 616
1958 AC D14
1960 AC D14
1987 Cub 1204
1982 Cub 682
1974 Cub 154 Lo-Boy (SOLD)
Hauler: 1998 Dodge Ram2500 Cummins
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Posted By: loyalorange
Date Posted: 12 Mar 2012 at 10:42am
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I would still like to know if anyone could share a torque sequence for this engine. I believe it is usually center bolts and work the way out to ends? Should I check compression on this and what should it be?
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Posted By: DonDittmar
Date Posted: 12 Mar 2012 at 11:17am
No torque sequence. Start in center and work to outside edges and go in stages.
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Experience is a fancy name for past mistakes. "Great moments are born from great opportunity"
1968 D15D,1962 D19D
Also 1965 Cub Loboy and 1958 JD 720 Diesel Pony Start
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Posted By: loyalorange
Date Posted: 12 Mar 2012 at 12:09pm
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Thanks. Do you know what the compresion should be ?
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Posted By: Brian Jasper co. Ia
Date Posted: 12 Mar 2012 at 12:20pm
I'd like to say it should be up close to 400 but I don't know for sure. I have the adapter to check compression on a 262, just have never done it. In the 40's, my D17D starts hard. It will start without any assistance. Below 40 it takes a whiff (I mean a slight whiff) of ether or a block heater.
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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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Posted By: loyalorange
Date Posted: 12 Mar 2012 at 12:23pm
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Where would you plug the adaptor in?
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Posted By: Brian Jasper co. Ia
Date Posted: 12 Mar 2012 at 12:30pm
It goes in place of the injector. Should be the same as used on the 262.
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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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Posted By: D-17_Dave
Date Posted: 12 Mar 2012 at 8:44pm
Sounds like the transfer pump is weak. Transfer pump in the input of the injector pump. If the transfer pump cannot build enough pressure at cranking speed to force fuel into the rotor head of section of the high pressure pump then it will never fire. The pump, timing, and compresion all have serious contributions to these engines.
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Yea, I can fix that.....
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Posted By: loyalorange
Date Posted: 13 Mar 2012 at 2:21pm
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I think you have it! That's where we'll start. Thanks!
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