70 D stalls cranking engine (update)

Dan in Ohio

Well-known Member
Location
Mid-Ohio
Convinced myself last night that there had to be fluid in the cylinders that seeped past the rings (oil) or fuel. There definitely seemed to be something physically stopping the engine from going through compression stroke. The same thing happens in a small gas engine when it is flooded(have the broken starer ropes to prove that). So this am I decided to change oil in both diesel and pony as they were due anyway. I always flush when changing oil and thought that might help clear the cylinders . First started the pony to let it motor the diesel to mix the oil for a couple minutes. The thing sounded so good motoring the engine under decompression I thought why not try to start again. So I eased the decompression lever forward and started hearing it go through the compression cycle as usual so I hit the throttle and it fired right up. I am still scratching my head on this one.
 
(quoted from post at 10:50:00 04/22/18) If it's a typical single lever 70 setup I don't think you have a choice on the decompression!

Brandon

I missed that 70 part, had 720 in my head.
Are all the linkages moving freely and properly adjusted ?
 
I'm pretty sure there was a change in the starting lever movement some where mid production. Did they go to the 2 lever arrangement? I changed two 70 diesels to electric chart and they were different in their lever arrangement, but I forgot the details.
 
The 70s always had the single lever as far as I know, but early 70ds used the lever to start the pony by pushing forward, then pulling back for the rest of the diesel stuff. Mid way through they started the pony with a separate foot pedal, using the lever only for diesel cranking. There were conversion kits to update earlier tractors, mine got updated along the way.

Brandon
 
B&D.

I have three 70D's and have been looking at the differences in the linkage that moves the decompression lever on the right side of the tractor . My initial inspection shows that
all three are a little different as far as how much they move that lever (no surprise to me). Trying now to look at the parts break down to understand just what is happening when
the decompression lever is returned to compression . Will try to start it again tomorrow with fingers crossed.
 

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