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Tracs 10-06-2019 12:20 PM

John Deere 332 Compression
 
Hello,

In my never ending curiosity I bought a diesel compression tester to test my 332's engine. The engine runs great, tiniest bit of hard starting when cold, but overall a great runner.

I use the tractor mainly to push and blow snow in the winter. I have found the 47" 2 stage snowblower can stall out the engine.

I tested the engine cold with the glow plugs removed and the fuel shut off disconnected.

I got

1. 400psi
2. 405psi
3. 415psi.

All pretty even and I think the numbers are fine. The manual calls for minimum of 355psi with max difference of 70psi between cylinders.

Does anyone know what a good running or fresh yanmar 3TN66UJ would have for compression?

rwmeyer 10-06-2019 02:14 PM

Re: John Deere 332 Compression
 
Tracs, If you're getting those numbers on a cold engine and the manual specs 355, I'd say it's not an engine problem...or at least not a compression problem.

AFTER engine runs for 5 minutes or so, go 1/3-1/2 throttle, engage pto and go full throttle. Listen to engine as you start moving snow. If engine starts to bog, reduce ground speed. Even at WOT, the second stage can only blow so much snow. Sounds to me like your moving too fast, the second stage gets loaded up and then the auger...stalling the engine.

I have a 14 hp with a 49 (single stage) thrower and found too fast a ground speed would clog thrower or stall engine. WOT and ground speed are the key! Bob

Tracs 10-06-2019 05:32 PM

Quote:

Originally Posted by rwmeyer (Post 12354787)
Tracs, If you're getting those numbers on a cold engine and the manual specs 355, I'd say it's not an engine problem...or at least not a compression problem.

AFTER engine runs for 5 minutes or so, go 1/3-1/2 throttle, engage pto and go full throttle. Listen to engine as you start moving snow. If engine starts to bog, reduce ground speed. Even at WOT, the second stage can only blow so much snow. Sounds to me like your moving too fast, the second stage gets loaded up and then the auger...stalling the engine.

I have a 14 hp with a 49 (single stage) thrower and found too fast a ground speed would clog thrower or stall engine. WOT and ground speed are the key! Bob

The compression test was done on a cold engine. I didn’t add oil to the cylinders.

I do feel the compression is fine. Was wanting to compare to others if they have ever tested.

Slower ground speed worked for me this past winter. As always I probably think there is a problem where there isn’t one.


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