D-15D Tach
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=49918
Printed Date: 22 Aug 2025 at 4:16am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: D-15D Tach
Posted By: Gary IN
Subject: D-15D Tach
Date Posted: 01 May 2012 at 7:53pm
| Did any D-15 Diesels have tachs? If so how were they driven? Thanks Gary IN |
Replies:
Posted By: D-17_Dave
Date Posted: 01 May 2012 at 8:26pm
|
There is a plug installed in the block above the plate for an external fuel pump. It looks like a spot for a distributor in a gas block. Remove the plug and there is an addapter that slide into that machined hole that is driven by the oil pump gear. I'll walk out and get a pic and be right back. ------------- Yea, I can fix that..... |
Posted By: D-17_Dave
Date Posted: 01 May 2012 at 9:15pm
Hope this shows up.
 I may have another drive if your interested. ------------- Yea, I can fix that..... |
Posted By: Brian Jasper co. Ia
Date Posted: 01 May 2012 at 10:55pm
|
Looks almost identical to a D17D tach drive. ------------- "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 |
Posted By: D-17_Dave
Date Posted: 01 May 2012 at 11:16pm
|
I guess it should as the 15"s 175 CI engine is a 262 w/ less 2 cylinders. Both engines are Buda Diesels.
Also if you are looking for a tach setup for a Diesel you'll need a Diesel tach as they are driven the opposite direction a gas engine is.
BTW Brian, I love your signature line. It's like anything is possible in a world where some men can create their own rules........... ------------- Yea, I can fix that..... |
Posted By: DonDittmar
Date Posted: 02 May 2012 at 7:22am
|
D15D tach is NLA, you would have to have yours rebuilt.....been there, done that...... ------------- 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 |
Posted By: D-17_Dave
Date Posted: 02 May 2012 at 12:13pm
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Are the 15 tachs smaller than 17 tachs? I never looked at mine close enough to notice a difference. ------------- Yea, I can fix that..... |
Posted By: DonDittmar
Date Posted: 02 May 2012 at 2:37pm
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Must be a different face???? When I redid my 15D, a looked in the AGCO parts book and the 15D tach is different than the 17D series I-IV and also the 19D(part numbers are different) ------------- 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 |
Posted By: Brian Jasper co. Ia
Date Posted: 02 May 2012 at 8:51pm
|
I guess the question would be does the D15D turn the same max engine speed as a D17D? If the gearing was the same, a D17D tach ought to work. I'm 98 44/100% sure the main difference in a diesel vs a gas tach is they turn opposite directions. If he has to have his 15 tach repaired, I've heard that Metro Speedometer in Independence MO is good at restoring and calibrating old tractor tachs. Thanks Dave. I joined a fraternity a while back and I can see a real difference in the values of the older guys vs many younger people today. Some stuff that is pretty common today just was absolutely a non option a generation ago. I spotted that quote on another site and when I think about it and compare it to history, along with some of my past life experiences, I believe it to be very true. ------------- "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 |