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D7 3T pony motor not starting

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10 months 4 weeks ago #248200 by V14
Replied by V14 on topic D7 3T pony motor not starting
Went back and messed with the dozer today. With the carb properly adjusted I was able to get it to fire but not stay running. Could get it running while adding gas or starting fluid to the carb. Noticed the fuel bowl was dirty again so I believe I'll need to flush the tank and clean the carb but in the mean time with help I'll be able to get it running long enough to get the diesel motor turned over and off the trailer
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10 months 4 weeks ago #248204 by trainzkid88
our d4 was very sensitive if you left it as it was the last time you ran it it was happy and would usually start on the 3rd or 4th pull after you had cleared the cylinders. touch the choke or throttle levers and you would be there ages till you got that sweet spot again. i swear they must get stage fright. and you always seem to draw a crowd and you get shitty and no one goes anywhere.

you could set your phone in a mount and use a video call to view the oil pressure remotely. if you had to leave her running on the trailer.

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10 months 4 weeks ago #248205 by trainzkid88
i would clean that tank thoroughly get some dog chain or a handful of small nuts and some alkaline degreaser mixed with hot water. and agitate really well.

i would also consider treating it with some fuel tank sealer. such as redkote or the POR15 product. ive used the KBS products one and it works very well.
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10 months 4 weeks ago #248213 by V14
Replied by V14 on topic D7 3T pony motor not starting
I'll do that and pull the carb and give that a good clean as well when it's finally at my property. Looking like it won't be til the weekend but at least I'm not be charged additional fees for having it stuck on his lowboy for a week.

When I was there yesterday I also noticed the right brake was very stiff. I saw it turn both ways so didn't pay attention to that when I bought it but now think he may have only been using the clutch to turn right and no brake. Hopefully that's a simple fix but I assume not.

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10 months 4 weeks ago #248217 by greengiant
you said in your first post: Sometimes it turns over and runs momentarily but not long enough to engage the diesel.
is your gas tank vented? I had the same problem. finally discovered that the unvented pipe cap was the culprit. loosened to let air in the tank and problem solved.
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10 months 4 weeks ago #248219 by V14
Replied by V14 on topic D7 3T pony motor not starting
I believe it is not vented but am not positive at the moment. I can give that a shot but seems the tank will still need cleaned regardless if I'm getting as much sediment in the filter bowl as I saw yesterday.
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10 months 4 weeks ago #248225 by Cat Yellow1

Or it has started perfectly every time you try for a year, you get people standing around watching it will give trouble. Just the nature of pony motors some how they know.

Very True!!
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10 months 4 weeks ago #248227 by danda
Replied by danda on topic D7 3T pony motor not starting
I don't have a D7, but I do have Wisconsin V4J with hand crank and impulse magneto that I start regularly.

With that engine, the key is to first get the carb filled with gas, then I put the crank on at around 3 o'clock and slowly rotate to around 5 or 6 o'clock and stop at a point where I feel compression is starting to build up. Then just one quick pull upwards towards 9 o'clock and hopefully it starts. If not, rinse and repeat. But NEVER, EVER try to muscle the crank around and around. That's where one can get into real problems.
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10 months 4 weeks ago #248238 by trainzkid88
the great uncle rekoned that with villiers engines roll em up to compression then roll em back a bit and a good sharp pull on the rope it should fire.
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10 months 4 weeks ago #248272 by Ray54
Replied by Ray54 on topic D7 3T pony motor not starting

the great uncle rekoned that with villiers engines roll em up to compression then roll em back a bit and a good sharp pull on the rope it should fire.

No rope on this model, standing on a track it gets a little hard to get out of the way if it jerks the crank out of your hand. A easy way to break a arm. I know some it happened to.



Maybe another gas tank for the start to get it off the truck. 
 

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