TRACTOR PARTS Allis Chalmers Case & David Brown Farmall & International Ferguson Ford & New Holland John Deere Massey Ferguson Massey Harris Minneapolis Moline Oliver & Cockshutt Kubota / Yanmar

TRACTOR MANUALS

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

Farmall & IHC Tractors Discussion Forum

I'm confused. I need some help

Welcome Guest, Log in or Register

Author

Marv

07-01-2005 14:04:04

Report to Moderator

I purchased a SMTA that had a aftermarket LP fuel system. I converted it over to gas and it runs great except that it diesels when I shut it off. I've checked the timing and it checks out OK. Nothing wrong with the carb. also. The head casting reads 8574-DC. I know the gas head number should be 8060-C. What do I need to do to stop the engine from dieseling when I shut it off? Thanks, Marv

[Log in to Reply] [No Email]

Jason Simmerman

07-03-2005 05:05:43

Report to Moderator

Re: I'm confused. I need some help in reply to Marv, 07-01-2005 14:04:04

I'll jump on this one. Are you sure you have it hooked up right electrically? If so maybe your kill switch is bad? Do you have the original? Our M was doing the same thing once and it turned out the kill switch was allowing current to pass through it even after it was pressed in. Could also be the idle mixture is set to lean. If that isn't the problem it is oil or carbon in the combustion chamber causing hot spots. You can get this stuff called Seafoam to help clean that out without pulling the head. It's the same stuff as the GM top end cleaner they use on fuel injected motors. This is good stuff for getting carbon and junk out of a motor. Follow the instructions on the can. Usually put about 1/2 a can in a full tank, and pour some into the carb inlet while the motor running for about a minute (it's going to smoke like nobodies business so do this outside) and then pour just enough to kill it after a minute. Wait 5 minutes and restart and let it run. Again going to smoke like nobodies business. If that makes a difference I recommend flooding it out again in a day or two because there is probiably stuff still in it.

[Log in to Reply] [No Email]

07-01-2005 21:44:02

Report to Moderator

Re: I'm confused. I need some help in reply to Marv, 07-01-2005 14:04:04

LP gas conversions usually had higher compression than gasoline. you may have 9/10 to 1 compression instead of 7/8 to 1 compresion ratio. Puller forum sometimes mentions using LP gas heads and pistons in building pullers using premium gas. Have you tried a tank of premium fuel? For stopping- just turn off gas valve, let idle down,turn off ignition when it sputters to halt. RN

[Log in to Reply] [No Email]

jossette

07-01-2005 20:07:38

Report to Moderator

Re: I'm confused. I need some help in reply to Marv, 07-01-2005 14:04:04

I always stut the p-cock after running- it gives the motor time to cool down and it doesnt diesel at all. If something should foul in the carb over night, you have $30 worth on the ground. Grandpa always did that in case that tractor didnt get started for a while.....

[Log in to Reply] [No Email]

Duner Wi

07-01-2005 19:24:58

Report to Moderator

Re: I'm confused. I need some help in reply to Marv, 07-01-2005 14:04:04

Idle it as slow as it will and when engine nearly stopped let the clutch out with transmission in fifth gear.

[Log in to Reply] [No Email]

KBB

07-01-2005 20:31:33

Report to Moderator

Re: I'm confused. I need some help in reply to Duner Wi, 07-01-2005 19:24:58

Until you can find out what is causing this problem just shut the tractor down in high gear and lock the brakes down tight and let out the clutch with the engine ideling, in other words , just choke the tractor off. Sounds like timing off,to far advanced,or it could be minus. Either way your fuel and electrial are not in combination. You can be working it too hard and cause it to overheat which will not allow it to burn all the fuel in the chambers. Last vehicle I had that dieseled I just got rid of it ,there was no fix . Or after working it hard let it idle and let it cool down then try switching it off. Sounds like you just a minor problem. Anyway this would irritate me. When an engine diesels it runs backwards causing all kinds of stress. Who did you buy this tractor from? Contact the previous owner and question them about the smta dieseling when trying to shut it down. In all cases they will say it never done it. I would advise to get rid of it and find another tractor. But then again it could be fixed if you can find out whats causing it to do this. Try this, crank the tractor in the morning while it's cold and then switch it off ,if it shuts down like its suppose to ,then take it from there. I still say it's the timing,just check your plugs and points and all the wires .Setting the timing is real easy. Rotate the thing the points are in while the engine is running,listen good. It may take several trys. I'm sure you will get better help concerning this subject.

[Log in to Reply] [No Email]

RAW in IA

07-01-2005 18:38:16

Report to Moderator

Re: I'm confused. I need some help in reply to Marv, 07-01-2005 14:04:04

The old IH's were well known of r dieseling if shut of while still hot. the later ones has an electiric solenoid on the carb at the idle needle(I think)that shut off all fuel flow when the switch was turned off. Without fuel they woyuld not diesel. Otherwise just put it in high gear and let out the clutch to stop it. Like mowr said, let it idlea few minutes to let things cool off.

[Log in to Reply] [No Email]

Haas

07-01-2005 18:37:06

Report to Moderator

Re: I'm confused. I need some help in reply to Marv, 07-01-2005 14:04:04

According to the parts CD I have, 8574 is the correct cylinder head for the SMTA gas and LP engines. I can't find the 8060 number listed for the SMTA. It shows up for the M and the early SM, but not the SMTA.

[Log in to Reply] [No Email]

mowr

07-01-2005 17:02:19

Report to Moderator

Re: I'm confused. I need some help in reply to Marv, 07-01-2005 14:04:04

Dieseling requires the same things as normal running; fuel, air and ignition. Ignition for dieseling is provided by something glowing in the cylinder, usually carbon, possibly spark plug heat range too high. Idling the engine for a little while before shutdown is recommended to help bring cylinder temperatures down. Richening the idle mixture a little means more fuel evaporating (cooling whatever's glowing). Setting the idle speed slower means less fuel air mixture to keep it running on. Good luck.

[Log in to Reply] [No Email]

[Options] [Printer Friendly] [Posting Help] [Return to Forum] [Log in to Reply]

TRACTOR PARTS	TRACTOR MANUALS

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