Top dead center
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=175198
Printed Date: 21 May 2025 at 10:50am
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Topic: Top dead center
Posted By: dfh9036
Subject: Top dead center
Date Posted: 15 Oct 2020 at 10:40pm
| Please bear with me on this question. I am trying to find top dead center for cylinders 1 and 4 on the engine in my D15 Series II. I need to adjust the valves. I see the mark on the flywheel that says “Center” . Where do I go from there? Greatly appreciate any words of wisdom. |
Replies:
Posted By: DiyDave
Date Posted: 16 Oct 2020 at 4:40am
|
Easy way is to remove spark plug, and stick a pencil, or wooden dowel down the hole, rotate the crank by hand, till the piston rises no more. Also, the center mark on the flywheel should be in the center of the window, on the torque housing, right side of tractor...  https://images.app.goo.gl/EzP8U8NTyMCujR296" rel="nofollow - https://images.app.goo.gl/EzP8U8NTyMCujR296
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Posted By: Dick L
Date Posted: 16 Oct 2020 at 6:33am
(CENTER) is Top Dead Center without the top dead.
|
dfh9036 wrote:Posted By: MACK
Date Posted: 16 Oct 2020 at 7:29am
| When exhaust closes and intake starts to open on #4, #1 is at TDC. Same with #2 and 3. MACK |
Posted By: dfh9036
Date Posted: 16 Oct 2020 at 9:22pm
| Thanks for the words of advice. I appreciate everyone’s input. Will work on it this weekend. Hope to get it up and running. |
Posted By: Dick L
Date Posted: 16 Oct 2020 at 9:40pm
| When it is at top dead center two valves on one of the cylinders are closed and can be set at that point. That means the rocker arms are up as high as they can get with both valves sealed tight ready to fire or ready for the gap to be set. You can follow the firing order each revolution as the TDC line is in the center of the inspection hole to set the gaps. I was taught back in the 1950's to set the valve gap one cylinder at a time as well as find the firing order of any engine this way. |
Posted By: MACK
Date Posted: 16 Oct 2020 at 10:21pm
| Dick, I'm with you. MACK |