Farm Equipment - D17 IV Timing

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D17 IV Timing

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=56030
Printed Date: 07 Sep 2025 at 8:47pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: D17 IV Timing

Posted By: Stan R
Subject: D17 IV Timing
Date Posted: 28 Aug 2012 at 7:15pm

I would like to thank DrAllis and others on suggesting that the reason for the "low level skipping" on my fathers tractor was due to the timing being off.

A few weeks ago, I set the timing at full throttle, 25 BTDC and it runs great without the skip. Lots of power! And the timing was way off before I adjusted it.

We have a Schwartz loader on it and I had to drop the frame on it a bit in order to get a clear shot at the timing hole.

But one more issue maybe you all could help me with: after running it hot for a while, even if we let it idle for say, 30 seconds, the tractor diesels when you shut the engine off. Any thoughts on what could be the cause? I do know though that the distributor has a bit of slop in the shaft.

Thanks for your advice.

Replies:

Posted By: DrAllis
Date Posted: 28 Aug 2012 at 7:30pm

If the idle speed is truly set where it belongs (400 to 500 rpm and that is slow) a D17 with standard pistons and sleeves shouldn't diesel ever. Maybe cheap gas?? lots of carbon on the valves or piston tops?? too hot of spark plug (AC Delco 44 XL is fine) ?