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John Deere Tractors Discussion Forum
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John Deere 80

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80820

09-14-2020 18:29:07




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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

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buickanddeere

09-17-2020 08:36:19




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 Re: John Deere 80 in reply to 80820, 09-14-2020 18:29:07  
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.



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80820

09-17-2020 01:46:21




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 Re: John Deere 80 in reply to 80820, 09-14-2020 18:29:07  
Quoting Removed, click Modern View to see

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?



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tlock0331

09-16-2020 18:44:53




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 Re: John Deere 80 in reply to 80820, 09-14-2020 18:29:07  
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



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Dan in Ohio

09-16-2020 13:42:41




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 Re: John Deere 80 in reply to 80820, 09-14-2020 18:29:07  
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



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Joel Sanderson

09-20-2020 05:59:50




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 Re: John Deere 80 in reply to Dan in Ohio, 09-16-2020 13:42:41  
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.)



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MSM

09-15-2020 07:51:53




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 Re: John Deere 80 in reply to 80820, 09-14-2020 18:29:07  
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.



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buickanddeere

09-15-2020 05:51:39




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 Re: John Deere 80 in reply to 80820, 09-14-2020 18:29:07  
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.

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80820

09-15-2020 04:40:39




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 Re: John Deere 80 in reply to 80820, 09-14-2020 18:29:07  
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.



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buickanddeere

09-14-2020 19:06:47




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 Re: John Deere 80 in reply to 80820, 09-14-2020 18:29:07  
Measuring with and where ?



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centash

09-14-2020 19:04:01




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 Re: John Deere 80 in reply to 80820, 09-14-2020 18:29:07  
Maybe one side of the block is plugged with crap and that cylinder is running hotter?

Ben



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