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Wisconsin VH4D troubles

crsutton81

crsutton81

Member
We have 2 of these engines that are giving me a fit. Both engines were totally overhauled within the last 6 years with some use since, but definitely not worn out. The one in the harvester started acting up 1st the end of last season. I rebuilt the carb twice, installed new manifold gaskets, and new coil with no change. The one in the Hahn hiboy has had the same treatment,except for the manifold gaskets changed. What happens is when the engines are cold, they work fine. Once any warmth has occurred, and especially in hot summer time Temps, they will start surging the governor and fall flat on there face until it is set back to an idle position on the throttle control. Both are getting plenty of fresh gas at the carb and plenty of fire at the plugs. Both engines have had electronic ignition installed for years. I'm stumped as to why they will both run fine at idle or half wide open but not at 2 to 2400 rpm consistently. Any ideas ?
 
They both have a magical rpm limit somewhere around half throttle that they will do ok. Once they have surpassed that limit, all bets are off. At this point the popping, snapping, and surging starts. The harvester engine has an electric fuel pump, so it'll tend to want to start to flood from lack of being able to burn the fuel. The hiboy has a gravity fed tank. It'll just fade out, then surge back several times until a lighter load is applied, or throttle position reduced like the harvester. If half throttle would be fast enough I'd live with it but both machines need 2000 plus rpm to function properly.
 
My first suggestion is to insulate the fuel lines to the carb all the way from the tank/pump. split a rubber hose and use aluminum foil tape to tape the rubber hose in place covering it with the tape so it reflects away from the line. Either mag or coil/points can have heat related failures in both the condenser, and the coil. Jim
 
Try to pen it down to fuel or ignition.

Does a partial choke help? Or have a oil pump can ready to give it a squirt of gas when it acts up. If that does not help chances are it is not fuel related.

Did you try new plugs, just to say you did...

Possibly a bad or wrong coil is heating up and failing. Also try direct wiring the coil to the battery to eliminate a bad ignition switch or wiring. Check the connections to the ignition module.
 
I can't offer any firsthand experience with those engines. I remember years ago seeing foil-backed water pipe insulation wrapped around a fuel line on an Oliver tractor. I asked the owner about it. His reason for doing it was to keep the gas cool. I think that would be a simple thing to try on the carb and fuel line.
 
When have you had all the sheilds of the engine and cleaned out all the cooling fins?I know that will make poor starting and running on those air cooled engines because of dirt buildup in the cooling fins and make hard starting and poor running. That needs to be done in dirty conditions every day. Learned that on our hay baler.
 
What everybody else said and could the valves just now be getting to tight. Might have been set correct at overhaul but now there is some time on them. Are they adjustable? Once it warms up there is no clearance.Keep us updated.
 
Sticking valves could be a real possibility, especially if the fins are clogged and it is overheating.

Synthetic oil works well in air cooled engines with their wide operating range temperatures.
 
On both engines, I removed the panels at the beginning of the season and thoroughly blew out all of the cooling passages in and around the cylinder jugs. That rules that out I would think being they both have ran maybe 30 minutes each. What puzzles me is both engines will run perfectly at any speed as long as you hold the governor arm at the speed desired, and override the governor. I have also adjusted the governor spring per the book, with above and below adjustments, with no luck. The gas lines have also been insulated to the carbs.

cvphoto131996.jpg
 
Does it have the little overheat switches under a head bolt??
Sometime those can cause fits.
And as others have said, make sure there isn't a mouse/bird nest in the
metal shrouding.
You may have to remove the flywheel shrouding to get it
totally clean. BTDT
Jon
 
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