Lx172 Runs Well for 29 minutes then stop!

   #11  

michiglenn

Bronze Member
Joined
Oct 18, 2004
Messages
60
Location
Western Michigan
Tractor
John Deere 4320 Z465 260
Hi,

My 1993 John Deere LX172 ran great and then all of a sudden stopped after about 20 minutes and wouldn’t run until it cooled off. I’ve cleaned the fuel tank, replaced everything from the tube in the gas tank to the carburetor including tube in tank, tubing, valve, filter, pump, and carburetor. Also filter and changed the oil. Next I replaced the coil and the firing order chip. After all this still runs for about 29 minutes and then stops. One thing that happens as it starts to stop is I get gas from the carburetor thru the short tube releasing gas onto the frame of the tractor.
I’ve had a repair shop look at it and they tightened the carburetor which I had replaced and replaced the fuel filter just because they felt that was the fix.
No fix as it still does the same thing, and ideas of what I can do next?
Gary Morgan
I had the same frustrating problem for a whole season, running well for about 10-15 minutes, then sputtering and dying. After letting it set (or checking for fuel in the tank) it would run again for 10 minutes, and repeat. Watching carefully one day, I saw that the tank was actually collapsing from vacuum. Finally it made sense, I bought a new cap with a clean vent hole and have had no issues whatsoever for about 5 years. The symptoms you have are identical to mine. It's worth a look...
 
  
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#12  
OP
G

GBM

New member
Joined
Aug 4, 2021
Messages
10
Tractor
Lx172
I just ordered a new carburetor and gas cap. I hope one of these fix this issue. I’m also going to replace my spare plug wire just to complete my rebuild.
I checked buying a new tractor but this one is a great asset and does everything I need with still solid parts replacement.
 
   #13  

therrien

Silver Member
Joined
Oct 23, 2001
Messages
133
Location
Salem New Hampshire
Tractor
Kubota B1700 TLB
Same machine with a kawasaki engine, had the same problem and I play with small engines as a hobby. This drove me crazy. REPLACE SPARK PLUG
Because spark can be seen you look no further but as it gets hotter the plug fails.
Be sure to replace plug. I only did this after many other trouble shooting steps and I stock 100+ plugs. I called myself an idiot for hours after.
 
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#14  
OP
G

GBM

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Joined
Aug 4, 2021
Messages
10
Tractor
Lx172
I did this already because I thought the new plug I put in I had the gap wrong. Still going to replace spark plug wire.
 
   #15  

CalG

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Joined
Sep 29, 2011
Messages
3,749
Location
vermont
Tractor
Hurlimann 435, Fordson E27n, Bolens HT-23, Kubota B7200
It's hard when you are working on fuel issues, but suspect ignition. How will you know what fixes the problem?

A timing light is a great way to evaluate ignition problems. I have TWO older Sears timing lights. I wouldn't be caught without one!

Fuel issues can be scoped out with a spray bottle of gasoline. Direct injection into the carb throat! Unless flooding is obvious. It takes a LOT of gas to not get pops and bangs with good ignition and good plugs. Wet plugs can be dried by pulling them and cranking the engine with the plugs happily sparking while laying on the engine or other grounded surface.

Coils that get hot will quite sparking if defective. I assume there is no condenser. 20 minutes is a long time....
 
  
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#17  
OP
G

GBM

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Joined
Aug 4, 2021
Messages
10
Tractor
Lx172
Yes but I have to use the chock to keep it running but still it will only run for a very short time and then will not start at all.
 

Richard001

Veteran Member
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Jun 25, 2015
Messages
1,005
Location
Plymouth, MN
Tractor
Jd lx178
Yes but I have to use the chock to keep it running but still it will only run for a very short time and then will not start at all.
I don't think that you answered Bravo's question.
 
  
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#19  
OP
G

GBM

New member
Joined
Aug 4, 2021
Messages
10
Tractor
Lx172
I purchased a new John Deere carburetor and as soon as it’s delivered I’ll install and see if that fixes the issue.
Thanks to all who helped by providing their thoughts and experiences. I’ll let you know the results.
Gary
 

Gator6x4

Veteran Member
Joined
Dec 7, 2003
Messages
2,277
Location
NC
Tractor
Kubota Grand L3830
This may help or provide information.

 
 
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