Ever see one this bad ? Bent Push Rod
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=131694
Printed Date: 07 Sep 2025 at 6:05pm
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Topic: Ever see one this bad ? Bent Push Rod
Posted By: Macon Rounds
Subject: Ever see one this bad ? Bent Push Rod
Date Posted: 22 Nov 2016 at 7:57pm
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Tractor was running fine, parked it and tried to start it a few days later. It would not start. Pulled it off to get it started and it ran very bad. Pulled spark plug wires off one at a time as it was running "BADLEY". #1 made it run a little worse. #2 and #3 made it run much worse. #4 was dead, it had no effect. Compression test showed #1,2 and 3 at 130 PSI and # 4 at 110 PSI. [/IMG]     ------------- The Allis "D" Series Tractors, Gravely Walk behind Tractors, Cowboy Action Shooting !!!!!!! And Checkmate |
Replies:
Posted By: plummerscarin
Date Posted: 22 Nov 2016 at 8:07pm
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YES! I'm going through the same exact thing with the 170. Intake valves on both cylinders affected were not moving freely in the guides. I just had the head redone before this. #1 and #4 had the bent pushrods. Hope someone here has an answer.
There was a sticky residue on the valve stem and in valve guide if that means anything
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Posted By: Larry in NC
Date Posted: 22 Nov 2016 at 8:24pm
| Yes, I bought a D10 a few years ago that had a skip. I thought it was a spark plug or wires, but finally pulled the valve cover and found a push rod bent like yours. I replaced the push rod and the tractor ran fine. Since I could not find the cause of the bending, I think it is possible that after years of use the push rod just weakened and bent for doing its job. (only a guess) If you need a used push rod, I have some. |
Posted By: Macon Rounds
Date Posted: 22 Nov 2016 at 9:15pm
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Well,,,, I have a theory. I had recently put some old questionable gas in the tractor. Then wife used it to putt around the ranch for a "few hours" picking up small branches and debris. She ran it at low idle most of the time and said it was running fine when she parked it. So, I believe the intake valve stems coked up with carbon and gas varnish which made the valve stick in the guide. What are your thoughts ? Pertinent INFO : This tractor has about 750 original hours, so it is nicely broke in. I had just changed the oil a few hours prior to the event and checked the timing. Ambient temperature was in the 80's. And ironically when I changed the oil turned up the fuel a 1/2 turn richer. Most likely making matters worse. ------------- The Allis "D" Series Tractors, Gravely Walk behind Tractors, Cowboy Action Shooting !!!!!!! And Checkmate |
Posted By: dgerth
Date Posted: 22 Nov 2016 at 9:24pm
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I will probably get booed here, but I had a IH 706 dsl that had bent push rods that were unavailable at the time, I used a block of wood and straightened them and installed and they ran fine till I sold the unit 4 yrs later. I have since done this procedure a couple of times with good success but only with solid rods. Just my $ worth of experience. dg
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Posted By: EricPA
Date Posted: 22 Nov 2016 at 10:07pm
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"Ambient temperature in the 80's" don't have to rub it in! ------------- Life is tough,but it's tougher when you're stupid. - John Wayne |
Posted By: ALLISMAN32
Date Posted: 22 Nov 2016 at 10:25pm
| Varnished up gas caused your problem. Didnt set up while the engine was initially running but after cooling down it got real gooey and stuck the intake valves. Probably gonna have to drain the tank and in my experience clean the tank. Varnish substance will be on the walls of the tank and continue to cause problems. |
Posted By: shameless (ne)
Date Posted: 22 Nov 2016 at 11:11pm
| yep....when I question.....blame the loving wife! |
Posted By: Macon Rounds
Date Posted: 23 Nov 2016 at 8:46am
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Bad Gas !!! Could be problematic at Thanksgiving. ------------- The Allis "D" Series Tractors, Gravely Walk behind Tractors, Cowboy Action Shooting !!!!!!! And Checkmate |
Posted By: JoeO(CMO)
Date Posted: 23 Nov 2016 at 8:55am
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Heck Ben, just load it up and bring along on your next trip this way! ------------- |
Posted By: DennisA (IL)
Date Posted: 23 Nov 2016 at 10:53am
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I had one that got in the crankcase of our lawnmower and when it came out it looked like someone try to tie it in a knot. Looked just like a pretzel.
------------- Thanks & God Bless Dennis |
Posted By: Macon Rounds
Date Posted: 23 Nov 2016 at 12:07pm
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Hey Joe !!!!! Just why would you want a bent pushrod ? Or were you wanting me to bring the whole tractor your way .... Ha ha !!! ------------- The Allis "D" Series Tractors, Gravely Walk behind Tractors, Cowboy Action Shooting !!!!!!! And Checkmate |
Posted By: plummerscarin
Date Posted: 23 Nov 2016 at 5:21pm
| Allisman, at first I thought no.. I put fresh gas in it. but your residue theory has merit. I'll clean that tank good while it's down, thanks. |