Welcome! Please use the navigational links to explore our website.
PartsASAP LogoCompany Logo Auction Link (800) 853-2651

Shop Now

   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver

Garden Tractors Discussion Forum

Kohler points plunger

Welcome Guest, Log in or Register
Author  [Modern View]

04-10-2020 17:31:10

Report to Moderator

I just got a rebuild kit for a K301 Kohler from Ebay. The seller states that if you have an aluminum points plunger you are supposed to replace the aluminum points plunger with a different one, perhaps a steel one. The one in my engine is the aluminum one. The seller states that an aluminum plunger will advance the timing and the engine will die from detonation.

Now this leads me to believe that the aluminum points plunger wears and closes the points, causing them to open earlier and the timing to advance.

Does anyone know what the measured length of a new points plunger for a K301 is supposed to be?

[Log in to Reply]   [No Email]

04-12-2020 00:47:22

Report to Moderator
 Re: Kohler points plunger in reply to t.r.k., 04-10-2020 17:31:10  
Aluminum expands more than steel for a given tempurature increase, but WAY down low on the block close to the oil in the oil pan I would be surprised the points pushrod ever exceeds 200 deg F.
EVERY time you set the points gap you are adjusting for ANY wear the rod may have suffered. I have heard the eccentric the push rod runs on can wear and not give the points enough gap. Didn't happen on any of my engines, but somebody claims it happened to him. I did replace the points pushrod on my old K241 last time I rebuilt it. The old one was fine, but I removed the engine from my Cub Cadet 72 to install my fresh K321, and SON took the K241 apart. It got moved from place to place 5-6 times before I had the machine work done and got the parts to rebuild it, the pushrod and the red valve in the crankcase breather ended up missing, but the gasket kit had a new red valve. That pushrod was ELEVEN DOLLARS!

[Log in to Reply]  [No Email]

04-11-2020 19:45:11

Report to Moderator
 Re: Kohler points plunger in reply to t.r.k., 04-10-2020 17:31:10  
Good evening, Steve A W: I can't find a table showing how much metals expand when heated; somewhere there are tables for such things. I feel safe in saying it would be very slight (like a small percentage) and would be small enough to not affect timing noticeably. Also, the engine parts would be exposed to the same heating, so that would cancel out the effect; i.e., the parts would all grow at a similar rate. Just my opinion,,,

Dennis M. in W. Tenn.

[Log in to Reply]  [No Email]
Steve A W

04-11-2020 14:39:02

Report to Moderator
 Re: Kohler points plunger in reply to t.r.k., 04-10-2020 17:31:10  
Does it expand the length when it heats up?

[Log in to Reply]  [No Email]

04-11-2020 10:11:33

Report to Moderator
 Re: Kohler points plunger in reply to t.r.k., 04-10-2020 17:31:10  
I would have to think it would take a very long time for the plunger to wear that much.

[Log in to Reply]  [No Email]

04-10-2020 20:30:57

Report to Moderator
 Re: Kohler points plunger in reply to t.r.k., 04-10-2020 17:31:10  
I don't think that is right Yes the aluminum one wears and should be replaced but as the alum one wears it gets shorter that would cause the points to open late retarding spark / closing the point gap
GB in MN

[Log in to Reply]  [No Email]

04-10-2020 18:24:10

Report to Moderator
 Re: Kohler points plunger in reply to t.r.k., 04-10-2020 17:31:10  
I don't think that's anything new, parts guy where I used to get parts 25 years ago told me to replace them.

[Log in to Reply]  [No Email]

04-11-2020 05:40:30

Report to Moderator
 Re: Kohler points plunger in reply to gab, 04-10-2020 18:24:10  
I've got a Kohler KT17 twin torn apart right now (which has sat for 10 years in a damp basement). The aluminum breaker point shaft had a build up of white corrosion on the top end. Bottom end of plunger still had oil on it and was perfect. I rubbed down the corrosion using super fine sand paper. So shaft had grown.

[Log in to Reply]  [No Email]
[Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Log in to Reply]

Hop to:

We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]

Home  |  Forums

Copyright © 1997-2023 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters

Website Accessibility Policy