Engine missing

General help and support for your Lindeman through 2010 John Deere crawler
Post Reply
gus
2010 crawler
2010 crawler
Posts: 695
Joined: Mon Jul 16, 2007 11:55 am
Location: North West
Contact:

Engine missing

Post by gus » Fri Dec 05, 2014 2:55 pm

No, it's still there, just not running right.

Pushing ice today, very rough ride, and the engine would start missing badly. It started doing this about 10-15 minutes after going out, ran fine until then. Sometimes I would stop or down shift to 1st and then it would run rough but then clear up and run perfect for a minute or two then start missing again. Did it more on an uphill push too but then it was under more of a load. If I didn't stop or downshift, it would continue to miss.

I pulled the choke slightly to see if it was not getting fuel, but then it just put out black smoke and did not run any different. It's only done this to me once before and it was also pushing snow in cold weather.

I have not had time to check anything yet but thought someone might have a suggestion.

monzanick
430 crawler
430 crawler
Posts: 57
Joined: Mon Jul 16, 2012 7:55 pm
Location: Somerset Wi

misfire

Post by monzanick » Fri Dec 05, 2014 9:43 pm

see if you can tell which cylinder is misfiring by checking the temp of the exhaust manifold or jug., If it is happening in cold wet, I would suspect spark stuff, cap/wires etc.

I don't thinks it is a carb or fuel issue cuz your choke doesn't change it.
1950 mc crawling around

User avatar
gregjo1948
350 crawler
350 crawler
Posts: 1000
Joined: Mon Aug 30, 2010 5:58 am
Location: Newark Valley,NY,USA

Post by gregjo1948 » Sat Dec 06, 2014 10:24 am

Check your points. It may be condenser or coil breaking down after it warms up. gregjo1948
JD 350B diesel 6way blade, Case 580B Loader/backhoe, Farmall 504 high crop w/ flail boom mower, International 404 , International 284 diesel w/belly mower, 1972 Ford F600 dump truck, Galion 3-5 roller, Allis Chalmers D17, 1620 Ford

User avatar
Paul Buhler
350 crawler
350 crawler
Posts: 991
Joined: Wed May 21, 2008 6:25 pm
Location: Killington, VT

Post by Paul Buhler » Sat Dec 06, 2014 6:13 pm

Hi: On mine when it starts acting up, I pull and check the plugs. They sometimes foul, and a torch "cooking" , regapping and cleaning sets them straight and the engine starts and runs as I expect. That said, I then try to figure out why the problem. Recently it was that the load jet had vibrated loose and was causing the engine to run rich. Fixed this and problem solved for the time being. paul
Paul Buhler
Killington, VT
420c 5 roll with 62 blade, FOPS, and Gearmatic 8a winch

gus
2010 crawler
2010 crawler
Posts: 695
Joined: Mon Jul 16, 2007 11:55 am
Location: North West
Contact:

Post by gus » Sat Jan 31, 2015 1:02 pm

Finally got around to checking it out. Pulled plugs and checked points. Both plugs looked good, running slightly rich. One plug gap was very slightly open so I regapped it. Points were slightly burnt. Cleaned and regapped and it's running very well now I'm pretty sure it was the points.

gus
2010 crawler
2010 crawler
Posts: 695
Joined: Mon Jul 16, 2007 11:55 am
Location: North West
Contact:

Post by gus » Mon Mar 09, 2015 11:19 am

Did it again after I thought I had it fixed. Missed like crazy at times when under load. That was the key.. missed under a heavy load, ran smooth coming back home empty. I'm going to pick up new plugs, points and condenser later today and see if that fixes it. Tried the choke again and it only missed more, not less but I'm also cutting off air if it is too rich already. Might need a carb kit if this doesn't fix it.

Scottyb
2010 crawler
2010 crawler
Posts: 565
Joined: Sun Sep 25, 2011 7:54 am
Location: Saskatchewan Canada

Post by Scottyb » Mon Mar 09, 2015 12:28 pm

New Distributor cap and wire to coil might be worthwhile. Also check the rotor shaft to be sure it is not sloppy from wear. The points you have might be shorting out on the shaft or dist body, if they are worn down too far from wearing on the cam. A worn out Coil usually fails when it is hot then will behave properly when it cools down. This could be the issue.

your problem sounds more electrical to me than fuel but, it could be one or the other or, a combination of both.

Running poor under load but better without could suggest it is running first lean, but it could be rich and you could try adjusting the high jet (if it has one or, clean out the carb well and blow out the jets. Make sure the float is working properly) A float that sticks open will leave you with a bad running engine) Choking should help in a running lean scenario but , in your case it is making things worse. It then suggests it must be running rich already (assuming fuel is your main issue)

I like to give my older gas engines a good cleaning with a treatment of seafoam when they mis behave,
first about a half a can in the fuel, to clean the inside of the carb, and then slowly pour or spray the rest in the carb intake while it is running (not too fast that it kills the engine ) sure cleans out an old engine, Expect that a dirty engine will smoke a lot when doing this!, then set the timing etc once the cleaner has things tidy. I often put seafoam in a gas engines oil as well to free up rings etc. Usually a half a can just a short while before an oil change.
Last edited by Scottyb on Mon Mar 09, 2015 12:42 pm, edited 1 time in total.
450`s c-dozer 6 way, b-loader.
350`s c-loader + ripper, b-loader with winch arch. B-loader with dozer pads
backhoe attachment.
1010 loader with forks for round bales
a few 610 Bobcats. many attachments

User avatar
Paul Buhler
350 crawler
350 crawler
Posts: 991
Joined: Wed May 21, 2008 6:25 pm
Location: Killington, VT

Post by Paul Buhler » Mon Mar 09, 2015 12:32 pm

Gus: Does your carb have a load jet? If so, try fiddling with that first. I had similar problems that were resolved once this was dialed in correctly. I eventually replaced mine since I couldn't keep the proper setting initially and it looked worn at the seat too.

Edit: I noticed that Scotty and I posted at nearly the same time.

Here's a link that you may find helpful. Paul

http://www.scribd.com/doc/60666720/Marv ... ual#scribd
Paul Buhler
Killington, VT
420c 5 roll with 62 blade, FOPS, and Gearmatic 8a winch

User avatar
Stan Disbrow
350 crawler
350 crawler
Posts: 2894
Joined: Fri Jul 15, 2005 3:13 pm
Location: Raleigh, NC

Post by Stan Disbrow » Mon Mar 09, 2015 1:21 pm

Hi,

I found, several years ago, that pump gas containing Ethanol tends to run lean and detonate under load, leading to micro cracks in the spark plug insulators. Once they form, missing under load is the result as the sparks sometimes fly way up inside and not at the tip.

I grew tired of replacing plugs all the time, so I switched to a 50/50 mix of pump gas with either 100 Low Lead aviation gas or 100 No Lead racing gas.

I originally tried running just 100 octane, but that lead to carb icing in the summer. So I cut to the 50/50 mix and now the old updraft carb engines no longer crack plugs or ice the carbs.

I am still regularly running two 2-cyl machines for real work. The 420c (for obvious reasons) and an M for weed cultivating.

So, it will be interesting to see which thing you find bad.

Stan
There's No Such Thing As A Cheap Crawler!

Useta Have: '58 JD 420c 5-roller w/62 inside blade
Useta Have: '78 JD350C w/6310 outside blade
Useta Have: '68 JD350, '51 Terratrac GT-25
Have: 1950 M, 2005 x495, 2008 5103 (now known as 5045D)

User avatar
Bret4207
440 crawler
440 crawler
Posts: 169
Joined: Fri Apr 28, 2006 6:10 pm
Location: St Lawrence Valley NY

Post by Bret4207 » Tue Mar 10, 2015 6:49 am

If it's happening more when you're traveling someplace with lots of vibration, like across ice, and you can rule out fuel issues, I'd be looking for wires with cracks in the insulation, a rotor or cap thats got issues, bad grounds. Check the wire insulation where it goes into the distributor. Check you plug wires too. If old and cracked they could be arcing against metal when vibrating.
40C, 420C, 1010C-L-BH, Cat D4

User avatar
gregjo1948
350 crawler
350 crawler
Posts: 1000
Joined: Mon Aug 30, 2010 5:58 am
Location: Newark Valley,NY,USA

Post by gregjo1948 » Wed Mar 11, 2015 4:48 am

How much blowby is there? Have you check compression? A lot of blowby/low compression will cause misfire under load quicker than no load. You're loosing the proper air/fuel mixture and also the vacuum required to draw it into the cylinders. gregjo1948
JD 350B diesel 6way blade, Case 580B Loader/backhoe, Farmall 504 high crop w/ flail boom mower, International 404 , International 284 diesel w/belly mower, 1972 Ford F600 dump truck, Galion 3-5 roller, Allis Chalmers D17, 1620 Ford

Post Reply

Who is online

Users browsing this forum: No registered users and 46 guests