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Blustery Knoll Farm 
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Joined: 04 Dec 2017
Location: Northern IL
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 Topic: 7020 starts hard cold and HOT
Posted: 27 Sep 2019 at 12:21pm |
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This is the tractor I swapped the combine motor into last winter. It runs good and doesn't burn oil. However, it won't start below 65° unless I plug in the block heater.
Also, if I stall it while working it hard, it will not start unless I let it cool off. If I idle it a few minutes before shutting it down, it starts, but has to crank a bit with the throttle open.
Any ideas what might be going on? I wonder if perhaps I have the timing just a hair too advanced or something like that.
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Joe(TX)
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Location: Weatherford. TX
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Posted: 27 Sep 2019 at 12:27pm |
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Check for a fuel restriction. It may need an injection pump rebuild
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1970 190XT, 1973 200, 1962 D-19 Diesel, 1979 7010, 1957 WD45, 1950 WD, 1961 D17, Speed Patrol, D14, All crop 66 big bin, 180 diesel, 1970 170 diesel, FP80 forklift. Gleaner A
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SteveM C/IL
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Joined: 12 Sep 2009
Location: Shelbyville IL
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Posted: 27 Sep 2019 at 12:34pm |
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Pump head worn.....try pouring gallon of water over pump when hot or stalled and see what happens....bet it starts
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Blustery Knoll Farm
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Posted: 27 Sep 2019 at 1:42pm |
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One other thing. I this is the same pump that I was running on the previous motor that spun a rod bearing due to water in the oil. That motor started down to about 55°, which is what I expected for these Allis motors. Don't recall any trouble starting that one hot. But always try to cool it down a few minutes before shutting it down.
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MACK
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Posted: 27 Sep 2019 at 8:49pm |
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Pump head in worn, delivery valve leaking, or transfer pump pressure low.
Nothing that Ed cannot fix. MACK
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Blustery Knoll Farm
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Posted: 27 Sep 2019 at 9:05pm |
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Any ideas why it started after the motor swap? Perhaps this motor has more blow by?
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DougS
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Posted: 28 Sep 2019 at 7:25am |
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Does the engine smoke a lot with white smoke after starting and until it warms up?
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Blustery Knoll Farm
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Posted: 28 Sep 2019 at 9:22am |
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Yep, loots of white/grey smoke for a few minutes when it's cold.
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DougS
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Posted: 28 Sep 2019 at 10:34am |
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Low compression.
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lowell66dart
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Posted: 28 Sep 2019 at 2:52pm |
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If your not ready to tear into the engine just yet a gear reduction starter would probably help a ton. It made a world of difference on my 7060.
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AC 6080 (8030,7060,200,175,D-17HC, 6040,160,6140 all gone) Farmall 1066 & 656 Hi-Clear (for sale), White 2-62 High Clearance, JD 4255 Hi Clear.
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DrAllis
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Posted: 28 Sep 2019 at 3:11pm |
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Make sure the 7020 injection pump is timed at 18 degrees BTDC. Sounds like in your engine swap this might have been changed ??
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victoryallis
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Posted: 28 Sep 2019 at 8:19pm |
 Blustery Knoll Farm wrote:
That motor started down to about 55°, which is what I expected for these Allis motors. |
A 301 should start good down to freezing.
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8030 and 8050MFWD, 7580, 3 6080's, 160, 7060, 175, heirloom D17, Deere 8760
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Blustery Knoll Farm
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Posted: 28 Sep 2019 at 9:47pm |
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DrAllis, I did set the timing according to the shop manual. I remember 19° off the top of my head. I will double check where it is at though. I've read that the ring on the balancer can slip though, and wasn't smart enough to check what the timing marks lined up at before pulling the pump and balancer from the old motor.
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injpumpEd
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Posted: 29 Sep 2019 at 12:22pm |
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I'm with dr on this, it was better before swapping, so now you have it timed slightly different than before is my bet. As mack said, if head in pump is worn, it won't be smoking much without ether to spin it fast enough to pump fuel hard enough to pop the injectors. Also, brings those up, same injectors that were with the pump? Or replacement engines own injectors?
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210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers!
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Blustery Knoll Farm
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Posted: 29 Sep 2019 at 8:44pm |
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Ed, I am running the injectors that came with the combine motor.
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MACK
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Posted: 30 Sep 2019 at 8:23am |
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If piping pressure is set higher in combine engine, a weak pump may not pop them with hot fuel. MACK
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Blustery Knoll Farm
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Posted: 02 Oct 2019 at 9:17am |
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I guess I'll double check the timing and try pouring water over the pump.
If the pump is the cause, and it is weak, is there any harm in running it as it is for a while?
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injpumpEd
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Posted: 02 Oct 2019 at 10:00am |
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No harm running it. My bet is the injectors are set much higher, now it has a hard time popping them open. Of course that is if it is not smoking much or at all during cranking. Timing could be the issue if it is smoking but not firing, assuming the engine itself has good compression. Reset timing, and run it.
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210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers!
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Blustery Knoll Farm
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Posted: 04 Oct 2019 at 12:42pm |
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Thanks for the feedback here. I just checked the timing this morning. It is right at 17.5° BTDC. Engine block at 54°F according to my infrared thermometer. It started after cranking about 30 seconds. If hard to start is the only problem, I can just remember to park it close to an electrical outlet until spring.
Edited by Blustery Knoll Farm - 05 Oct 2019 at 8:06am
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