Posted by Goose on May 19, 2013 at 19:34:00 from (70.197.193.142):
I posted yesterday about a 24hp OHV Briggs engine that bent a pushrod.
I worked on it today. I didn't have a new replacement push rod, but I straightened the bent one and found it was 3/16" in diameter. I found a piece of steel brake line tubing that was 3/16" inside diameter. I cut a piece of the tubing an inch shorter than the push rod and tapped the push rod through it, leaving about a half inch on each end. I installed the push rod, set the tappets, and turned the engine over by hand with the spark plugs removed.
When that valve opened all the way, I heard a scraping sound of some sort, but the push rod held up. I spun it with the starter, and it worked OK. I put the spark plug on that cylinder and had good compression. I put both plugs in, held my breath, and hit the starter. It fired right up and ran like champ. I put it all back together and went out and mowed for a few minutes.
So, what happened? Beats he11 out of me, but I have a theory. Number one, the cooling fins had a lot of grass clippings in them, possibly causing the engine to run hotter than normal. Number two, both tappets on that cylinder were noticeably 'way looser than the other cylinder, possibly mis-adjusted at the factory. (I reset them the same as the other side).
My theory is, if the tappet was too loose and the engine running too hot, carbon built up on the valve stem until the valve would't open all the way and bent the push rod. The scraping sound I heard when I first turned the engine over with my reinforced push rod must have been the valve guide scraping carbon off of the valve stem.
Anyway, with the grass clippings cleaned out and everything else cleaned up, it's running like a champ. I'll buy a new push rod when I get a chance.
Great piece of creative shade tree mechanicing, even if I did do it inside in a well equipped shop.
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 ]
Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
... [Read Article]
Latest Ad:
1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
[More Ads]
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.
