[AJD] Two cylinder 420

[Dean Van Peursem]

Bill,

Apparently JD decided the 160 was best for this tractor when using gas. I don't
have experience with the vertical two cylinders but I much prefer higher temps
for the gas horizontal two cylinder tractors. But I sure wouldn't recommend
anything for a 420 other than what JD recommends. I'm sure for the "All Fuel"
tractors, the 180 degree thermostat improved complete combustion a bit.
Typically "All Fuel" tractors were lower compression than gas and maybe a gas
engine with higher compression needed more thermal head room under heavy load
when combined with high ambient temperature. 


Dean Van Peursem
Snohomish, WA

If we take the time to count our blessings we don't have time to complain.



-----Original Message-----
From: antique-johndeere-bounces at lists.antique-tractor.com
[mailto:antique-johndeere-bounces at lists.antique-tractor.com] On Behalf Of Bill
Salisbury
Sent: Thursday, July 17, 2008 6:28 PM
To: antique-johndeere at lists.antique-tractor.com
Subject: [AJD] Two cylinder 420

I have discovered that my JD 420 is running at 160 degrees which is what the new
thermostat is rated for.  My new water temp gage is out of calibration and only
shows 140 degrees at full operating temp.  I am not concerned about that.  My
question is to you fellows with more experience than I, would it be better to
have a 180 degree thermostat in this engine?  

The parts manual calls for 160 for a gasoline engine, but calls for a 180 for an
all fuel engine.  Seems like what would be good for the goose, would be good for
the gander too.  Any good reason not to run it at 180?

No matter how hot the day or how heavy a load I am pulling with it, the temp
stays the same at 160.  In case you are wondering how I determined the actual
temp---it was by infra red heat gun.

I welcome your comments.

Bill Salisbury
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