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Bobcat 720 with vh4d dies when warms up

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Tim

07-12-2003 15:56:19




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after replacing the coil plugs and wires and condenser my bobcat with a vh4d winsconsin runs great for about 5 mins then starts running rough at full throttle then dies.




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Tim

07-16-2003 12:43:06




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 Re: bobcat 720 with vh4d dies when warms up in reply to Tim, 07-12-2003 15:56:19  
I tried all of suggestions butt still no solution
I notised exhaust manifold leaking by fuel line so I replaced gasket but no fix. I have a clear fuel filter and I noticed that when machine dies fuel filter is empty. relaced mechanical fuel pump but no fix. Do they make an electric fuel pump for the vh4d motor?



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tramwayguy

07-13-2003 06:44:04




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 Re: bobcat 720 with vh4d dies when warms up in reply to Tim, 07-12-2003 15:56:19  
Another item which can cause a problem is the wrong muffler (or restricted exhaust). The engine will overheat rapidly and (especially with a fuel pump) vaporlock. I know because it happened to me 30 years ago when my employer put a Farmall tractor muffler on a windrower with a Wisconsin 'V' engine. It would run great for about 5 minutes then start running rough and quit. We looked at everything - finally took off the muffler and it ran famously afterwards.

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murray

07-13-2003 06:35:18




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 Re: bobcat 720 with vh4d dies when warms up in reply to Tim, 07-12-2003 15:56:19  
We had a NH skid loader with a vh4d that would run good for about 30 mins. then start to run ruff. in the winter it ran fine. tried all kinds of things, even cut the manafold between the exust and the intake (thought it might be vapor locking) never did get a handel on it. Finaly fixed it by buying a new skid loader with desiel motor. Thought it was just our motor and I suspeced the valves were the proublem. Our Vg4d on the haybine never has this proublem and it was built in the 60s but the valves are loose in it and i do remember the valves being stuck in the 70s but after set all winter. our WD AC did this and i did the auto trans fluid trick in the gas. Have to put it in the gas every time we fill it or it starts to run ruff. should have tried it with the skidloader. Good luck let us know if the trans fluid trick works.

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Bill

07-12-2003 17:50:05




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 Re: bobcat 720 with vh4d dies when warms up in reply to Tim, 07-12-2003 15:56:19  
Wisconsins were famous for sticky valves. A nightmare for farmers with haying machines after sitting all winter. While revved up, hit the kill switch & put a couple shots of automatic transmission fluid down the carberator with a pump oil can while she winds down will do wonders for the sticky valves if left to set a few days before restarting. Something about the metals wisconsin used & automatic transmission fluid works wonders together. Also you failed to mention the age of the motor. You might need a lead substitute in the gas. Wisconsins are air cooled & the lead use to carry away a lot of heat..... I use to have a 2cyl Wisconsin in my New Holland 225 skidsteer. Had the same problems but still wish I never sold it. OH YEAH..... If your Wisc has a magneto, the magnet that generates the magnetic field for spark will get old & the sign of failure was erratic & loss of spark when heated. Had that happen to my 225 too. Good luck....Hope I threw something out there you can use....

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Bill

07-12-2003 17:57:38




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 Re: Re: bobcat 720 with vh4d dies when warms up in reply to Bill, 07-12-2003 17:50:05  
Just reread your post. You appear not to have a magneto/have conventional points/coil/consensor ignition. Point gap changes will change your timing. Be sure timing is correct or that could make you overheat/stick valves. If the problem is spark related & not mechanical, bad condensors will also give the same symptoms. In todays world just cause it's new don't mean it works proper....



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sonnyg

07-13-2003 02:55:30




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 Re: Re: Re: bobcat 720 with vh4d dies when warms u in reply to Bill, 07-12-2003 17:57:38  
add Marvel Mystery Oil to the gas.Available at most parts stores. works for me.



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Bill

07-13-2003 04:45:46




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 Re: Re: Re: Re: bobcat 720 with vh4d dies when war in reply to sonnyg, 07-13-2003 02:55:30  
I'll give that a try in the older stuff requiring lead that I let hang around. THANKS! As long as we are swapping recepies, In my older diesels that were built for sulphur added diesel fuel I put 1 can ( 2oz?/whatever those little cans are that Wal-Marts sells in the garden dept for lawn care stuff.. ) 2 stroke ( chain saw, weedeater/whatever ) oil to 20 gallons of fuel to compensate for the lack of sulphur lubrication in todays commercial diesel fuel ( kinda like unleaded for diesel ) for the injector pump. This oil meant to be burned & not leave deposits does not effect/foul the injectors. In my over the road diesel truck I just have to be careful that I use blue oil & not red.....

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ken

07-12-2003 17:44:15




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 Re: bobcat 720 with vh4d dies when warms up in reply to Tim, 07-12-2003 15:56:19  

sounds like you might have gotten a bad coil.



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mike

08-23-2003 10:23:51




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 Re: Re: bobcat 720 with vh4d dies when warms up in reply to ken , 07-12-2003 17:44:15  
Years ago I had a bobat with the VH4D and had just rebuilt it with new everything. The first job I did it ran great for a short time then died. I let it sit for a while and it started and ran great.....for a while, then died. I figured it was vapor locking so I made a thin plate and installed that between the carb and manifold. This solved my problem and it never died again. You didn't say how long yours ran before it quit, just that it dies after warming up. Don't know what your idea of warm is or is it at full operating temp? If it's at operating temp then this may solve your problem.

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