1996 John Deere Gator 6x4 - Engine Problems - John Deere Gator Forums
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post #1 of 12 Old 05-24-2019, 07:16 PM Thread Starter
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1996 John Deere Gator 6x4 - Engine Problems

I have lovingly restored this older 6x4 but am having some issues with the engine. I am a weekend warrior and a massive tinkerer. I can usually fix anything if pointed in the right direction. I recently changed the spark plugs, carburetor and fuel pump.

Built on 12/7/94
PC2387
SERIAL #W006X-4X011774
ENGINE #FD620D-056404

I uploaded a video of the problem I am having. It idles perfectly then when I run it at speed it sometimes loses power then blows out blue smoke. Any advice would be appreciated.


At 38 seconds it developed a loud noise
At 55 seconds loss of power
At 1:27 Blue smoke appeared
At 1:50 Blue smoke appeared
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post #2 of 12 Old 05-25-2019, 09:16 AM
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im guessing head gasket, warped head, or valves. possible rebuild / repower in your future. I was pretty cool with everything until the plumes of blue smoke! how many hours on the engine?

2000 Gator 4x2
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post #3 of 12 Old 05-25-2019, 01:53 PM Thread Starter
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No idea on hours as I bought it used but I imagine a ton. Someone mentioned teeth coming off the cam (As it might be plastic) and timing is off or ignitor box
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post #4 of 12 Old 05-27-2019, 06:45 PM
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Your cam gear is OK, it's a no-go at all if it was bad. I'm going to take a different tack and question whether the smoke you're seeing is even exhaust smoke. What I'm seeing, especially in the second episode is smoke emitting generally from the driver's side of the engine, not specifically from the exhaust. Also, the smoke isn't as blue as I'd expect oil smoke to be. So I'd be looking at an issue with the clutches and/or transaxle. Just guessing, but it could be an intermittent bogging down caused by a sticking brake or other tranny malfunction causing the belt to drag, overheat and smoke. This would also explain the bogging down. It's a long shot, but next time it happens quickly stop the engine and check the belt and primary clutch for excessive heat. Good luck and keep us posted.
BTW, great looking machine!
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post #5 of 12 Old 05-28-2019, 07:35 AM Thread Starter
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Now that I re-watch this, I think you might be correct. The engine starts and seems to run fine. Would your recommendation be to remove the whole thing and rebuild then? Never done that but am up for the challenge. I am sure you tube has some videos on this.
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post #6 of 12 Old 05-28-2019, 07:21 PM
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If belt drag is the problem the primary suspect would be the secondary clutch or tranny/brake. Doubtful it would be your primary clutch. I'd do a little more investigation before doing any rebuilding or replacing.
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post #7 of 12 Old 05-29-2019, 07:39 AM Thread Starter
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Well it appears you have something here. I looked at the clutch and looked at what it should look like and it is missing some clutch buttons. Do people always just buy a new one for $400 or can I rebuild this? I know this definitely is an issue but is there a way to know if something internally is wrong also that needs to be dealt with at the same time?
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post #8 of 12 Old 05-29-2019, 10:28 AM
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Buttons are an easy replacement, and available from deere. They should be in the $20 - $25 range for a set of 6
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post #9 of 12 Old 05-29-2019, 03:31 PM
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Looks like the pulley nearest you is about to fly off at times. Why is it moving?!?!?!
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post #10 of 12 Old 05-30-2019, 02:09 AM
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Quote:
Originally Posted by Douglas Post View Post
Well it appears you have something here. I looked at the clutch and looked at what it should look like and it is missing some clutch buttons. Do people always just buy a new one for $400 or can I rebuild this? I know this definitely is an issue but is there a way to know if something internally is wrong also that needs to be dealt with at the same time?


Perhaps this will help? You can replace the button/ramps at home.





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post #11 of 12 Old 07-28-2019, 06:16 PM Thread Starter
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New Video of Issue I am Having on my 6x4 Gator

Trying to sort this out, I replaced the V Belt, (2) Drive Chains, The clutch on the transmission and rebuilt the clutch attached to the engine. New fuel pump and plugs, cleaned carburetor. Starts and idles like a champ. Everything good until I go full speed for a while then loss of power smoke billows out then it starts running fine again. This is intermittent not all the time. Almost like one of the cylinders is not fully evacuating and then does so all at one time. Here is the video, I recorded three separate instances when the smoke came out then dissipated. I am a weekend warrior and just watch you tube videos on how to repair things. I can usually repair things if I know what direction to go. Smoke is coming from engine not belts so where do I start and how deep in the engine do I need to go? As it will be apart should I do anything else like replace the plastic gear with a metal one?

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post #12 of 12 Old 07-28-2019, 11:07 PM
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In my honest opinion these engines are generally not worth a rebuild.
We tend to rebuild them just because of the simple fact that engines are more expensive than in the u.s.
Our limiting factor is import costs

But for the weekend warrior you could get away with a small rebuild probably.
This all sounds like an engine that starts to burn oil as it gets hot, and allmost sounds like piston rings

So this could go from anything as simple as new piston rings to rebore and new pistons etc etc.
Lots of unknowns here.
Open it up and go from there, the engine could even be a goner for all we know.

I had a customer come in once for a service and i infact uncovered that one cylinder completely destroyed itself.
Things go like that sometimes

Last edited by טים ירושלמי; 07-28-2019 at 11:13 PM.
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