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

Discussion Forum

RPMs and other engine stuff

Welcome Guest, Log in or Register

Author

Rich,NJ

11-13-2002 16:29:57

Report to Moderator

Today, after several modifications, not the least of which was a Carb rebuild,(see my post to
Bill BC. I'm finally getting somewhere with the details of the settings on my 52 8N
(affectionally known by my wife as Mr"T") I also got a new proofmeter to monitor all this and I'm finding out all kinds of stuff. I also rewired it and installed a new ignition switch. Ferinstance, I can't seem to get the full 2000 RPM that I'm told this tractor should be giving me. 1800-1900 seems to be it's limit. But what's really fun is when the machine is under an even slight load, It's likely to backfire. This sends the RPMs up by a hundred or so for a few seconds, Then its back to 18-1900. By a slight load, I mean climbing a 4% grade. Otherwise, it runs nicely and starts well. (Starts well with a 12V push that is) I did manage to get it to fire up on 6V today (new ground being broken here!) The carb seems to be doing it's job, so I suspect it's timing. I went up the grade several times and I noticed it seem to bark and surge in just about the same place each time. Consistent, anyhow! It also backfires in 4th gear. I did retard the timing a slight amount and this seemed to help with the starting. Previously it would cough loud enough to kick out the starter. But as previously mentioned, It would fire up very nicely with a 12 V spin. Any suggestions? Thanks , Rich

[Log in to Reply] [No Email]

DavidO

11-14-2002 04:46:50

Report to Moderator

Re: RPMs and other engine stuff in reply to Rich,NJ, 11-13-2002 16:29:57

You don't really need a timing light to set the timing on your tractor with side mount distributor. Set the carb and throttle as Dell said. Then advance the timing just to the point where it begins to miss, then slowly retard the timing back thru "running good" to the point where it just begins to miss. Advance it just enough to eliminate the miss. Easier than it sounds, if you have a pretty good ear. You can check it with a timing light and it will be "dead on". If you still have a miss or backfire in 4th gear, you either have a fuel mixture problem, weak spark, or low compression. These things cause misfiring "under load". Sounds like you are having fun with it. Hang in there.

[Log in to Reply] [No Email]

Dell (WA)

11-13-2002 19:29:05

Report to Moderator

Re: RPMs and other engine stuff in reply to Rich,NJ, 11-13-2002 16:29:57

Rich..... ...max engine rpms (2200) is controled by the governor. You do know the governor is adjustable don't you? Some of your coffin problems could be a slightly lean main jet, I'd unscrew (enrichen) it 1/8 turn. Your consistant repeatablity of coff and stumble going up an incline is clue there. Backfiring can also be a clue to lean running. I usually find adjusting the mainjet to 1 1/2 turns is usually in the ball park. Theres otherways of adjusting main jet if you don't feel confortable with my ballpark..... ...Dell

[Log in to Reply] [No Email]

Rich,NJ

11-13-2002 21:16:20

Report to Moderator

Re: Re: RPMs and other engine stuff in reply to Dell (WA), 11-13-2002 19:29:05

Thanks Dell, I've started with a 1 1/2 turn setting. I wasn't happy with the recommended one turn. I'm wondering if I have the float too low and the incline is changing the level just enough to cause a momentary leaning. But that would not explain why it's backfiring in fourth. It flys along with an indicated speed of about 12 MPH but it'll be backiring all the way. Something it won't do in third. until it comes to that gentle slope. Can excessively advanced timing cause this also? It seems as though it would. My plan for tomorrow is to retard the timing another slight amount, Perhaps two degrees for experiments sake and see what happens. I don't have a light so it's guesswork. Thanks again Rich

[Log in to Reply] [No Email]

Dell (WA)

11-14-2002 01:38:19

Report to Moderator

Re: Re: Re: RPMs and other engine stuff in reply to Rich,NJ, 11-13-2002 21:16:20

Rich..... ....ya can mucka rounda with yer timing, but everthing you've describes sounds like governor problems to me. Yer backfiring 'cuz yer too lean.

If'n yer doing guess-timing ona sidemount, tweak distributor for max rpms at idle 450 rpms, its really not too critical. Too advanced, you'll have starting problems, not enuff advance, ya won't have much power..... ...Dell

[Log in to Reply] [No Email]

Rich, NJ

11-14-2002 09:02:19

Report to Moderator

Re: Re: Re: Re: RPMs and other engine stuff in reply to Dell (WA), 11-14-2002 01:38:19

Today's report..... I gave the highspeed Mixture screw a half a turn outward. No difference I brought the timing back maybe a degree or two.... No noticable difference (retard) I pushed on the linkage while the engine was on full throttle.I raised the RPM about a hundred. I moved the adjustable end to the throttle linkage rod about a 1/4". This raised the top end about one hundred RPM. It still backfires. Is this how you adjust a governor, By the linkage rod ends? Is it possible that a setting of about 5/16ths on the float level is too low and causing a lean condition? I set it lower because I added weight to the floats when I soldered them. I tried to compensate for the lower bouyancy that would come from the extra weight. Rich

[Log in to Reply] [No Email]

Dell (WA)

11-14-2002 12:51:02

Report to Moderator

Re: Re: Re: Re: Re: RPMs and other engine stuff in reply to Rich, NJ, 11-14-2002 09:02:19

Rich..... ...weight of float has no effect on fuel level, different law of physics applies here, use 1/4", and I still don't think its a timing issue.

Have you checked your sparkies? read the color? soft sooty black? hard glazed gray? Spark gap 0.025? Weak sparkies or fouled sparkie can cause backfireing. ALSO check your firing order. 1,2,4,3 CCW. Durn tractor will run on 2 sparkies and be weak and misfire.

Governor has a max rpms adjust 2200. Set screw down at bottom of governor levers. Read about it in your I&T FO-4 manual..... ...Dell

[Log in to Reply] [No Email]

Rich,NJ

11-13-2002 21:15:51

Report to Moderator

Re: Re: RPMs and other engine stuff in reply to Dell (WA), 11-13-2002 19:29:05

[Log in to Reply] [No Email]

Jack - Illinois

11-13-2002 17:37:40

Report to Moderator

Re: RPMs and other engine stuff in reply to Rich,NJ, 11-13-2002 16:29:57

A partially shorted coil will cause these symptoms, but so will fuel problems. The newer "N"s with the proof meter should bring the hand right on past all the marks if you reach in behind the carb and give the rod some finger pressure.

[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