Posted by NCWayne on May 22, 2014 at 21:18:28 from (173.188.169.54):
Got a question for ya"ll. Went to look at an old Bobcat this evening that had a VH4D Wisconsin in it. The owner said he bought it running, and ran it for a few hours one day before it started smoking a little bit. Not exactly sure that meant, but he said when he started seeing the little bit of smoke he parked it.
When he went to run it again a week or so later it wouldn"t crank. He said before it started right up with only a partial application of the choke. He checked and had fire so decided that it must not be getting fuel so he replace the fuel transfer pump. It still wouldn"t run so he said he checked each wire and plug to insure the wires were plugged in, and the plugs were actually firing. Still, it wouldn"t run, so he gave up.
So, I get there today and see there is fuel pressure but the bowl is dry. Pulled the carb, got the needle unstuck, and put it back on. Tried to get it started again, but even though I could see there was fuel in the bowl now, and knew I had fire, it still wouldn"t run.
So, I started digging in deeper and when I looked at the book I discovered that the plugs weren"t wired right, and appeared to be 180 out. So, I wired them back per the service manual, and when I tried it again, it fired right up. The problem was that although it ran, it kept backfiring through the intake, and blowing flames through the exhaust. It seemed to be either severaly out of time, or possibly had a burnt valve given the flames going both directions. I tried changing the timing but the problem didn't get better regardless of which way I went, and too far either way simply shut it down. One off, I could reset the timing back to where it had been, and it would run again, but still do the flaming exhaust and backfiring through the intake.
Unfortunately even though I got it running, at least halfway, both head gaskets were leaking so it"s got to be taken down to at least repair that problem. This will let me check the valves when I get into it, so it"s all good there. Hopefully they just need to be adjusted, and aren't burnt, but no way to know til I get into it deeper next week.
All that said, have any of you ever seen a V4 series Wisconsin actually run when it"s timed/wired 180 degrees out of time? I never heard of or seen one run like that, but the owner swears he didn"t do anything with the plug wires but pull and replace them one at a time to insure both ends were plugged in properly, and to pull the plugs one at a time to check fire.
So, just curious, has anyone ever seen this happen, because it"s a new one on me?
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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