John Deere 80

80820 · Sep 14, 2020

Hi to everyone and thank you in advance for the input. I've recently purchased an 80 and it runs like a top. EXCEPT one cylinder is running about 90Degrees F colder. It's not missing or slobbering but I'm curious if anyone has seen this before? It starts instantly like we've all seen them do , so I'm not sure if it's a compression issue or an injector or a bad valve . Thanks for your input.

Ryan

centash · Sep 14, 2020

Maybe one side of the block is plugged with crap and that cylinder is running
hotter?

Ben

buickanddeere · Sep 14, 2020

Measuring with and where ?

80820 · Sep 15, 2020

I had went for a drive with it and worked it a small amount climbing hills. The system is free of debris and garbage , fresh antifreeze is in it. I brought my ray tech and took a temp reading on the exhaust manifold as it left the head. Left cylinder said 225 and the right cylinder was 137-145. The engine temp is running at 150, a bit cool.

buickanddeere · Sep 15, 2020

At such light loads the temp difference may or may not indicate anything . Balancing the injection pumps for equal delivery at idle is an art and a science .
Ill bet you a beer that the colour of the manifold is different on one side than it is on the other .
Take her out ploughing for an hour with 4x14 or 5X14 and take more readings.
If you can find a thermal camera, this will make the warm and cool spots more distinguishable .
Image is a Traeger BBQ.

MSM · Sep 15, 2020

Might be one of the
injectors. One could be
putting out more fuel thsn
the other, or on the other
hand one could be slightly
clogged and not putting
out enough fuel. I have
had good luck filling the
secondary filter with
Seafoam and working the
tractor at full load to
clear the injectors. Just
idling around doesn't do
that big motor any favors.

Dan in Ohio · Sep 16, 2020

Ryan,

Sure would like to see a pic of your 80 as it seems they are rarely talked about or seen unless Weirddeere and I are discussing
uors.

Dan

tlock0331 · Sep 16, 2020

Dan in Ohio, eventually Dan, i will be able to as well. I have an 830 that i think is going to be a fairly quick runner, then the left over 830 parts will go to the 80 and hopefully have it done, target date, 2022 haha

80820 · Sep 17, 2020

(quoted from post at 07:51:53 09/15/20) Might be one of the
injectors. One could be
putting out more fuel thsn
the other, or on the other
hand one could be slightly
clogged and not putting
out enough fuel. I have
had good luck filling the
secondary filter with
Seafoam and working the
tractor at full load to
clear the injectors. Just
idling around doesn't do
that big motor any favors.

Morning, Thanks for the help . I'm going to pull the injectors and send them in for testing. I've got a set of 830 injectors would you recommend putting those in and trying it?

buickanddeere · Sep 17, 2020

Put the tractor on a dyno. I'm wondering if you are looking for problems that don't exist .
The 6x12 thou nozzles used a 13mm pump. The R, 70, 80 and 820 green dash had 10mm pumps.

Joel Sanderson · Sep 20, 2020

They didn't sell many because guys still loved their nice, comfortable D's and were not impressed by the awkward, bumpy-riding R and 80 blowing acrid, black diesel fumes.

(Okay, that was a useless joke.)

John Deere 80

80820

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centash

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80820

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buickanddeere

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MSM

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Dan in Ohio

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80820

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