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Super MD Questions

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49 Cubber!

11-25-2003 14:54:27




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53 Super MD,sat for at least 8 yrs,amybe longer.Engine is locked up but in all seriousness I think we can free it up.Weve pulled both manifolds and plugs and from what I can see no serious rust in anything,just light ,and I mean light rust on the #4 gas intake valve(I think that is what it is).Question 1,on the intake manifold where what would be the front of the tractor,there are two what appear to be electrical connections,whats this,heater of some sort and how,if any way possible without hooking it up can I check it and if it isnt good,can we do without it?Question 2,wheres the engine serial number,cant find it anywhere?I thought the manifold was busted bad but to my surprise it wasnt busted at all,just a little broke off where the pipe bolts down,but not bad enough to worry about.There was some kind of wadded up leathery looking stuff in it,possibly put in to keep water out years ago,seems to have worked.I have loaed up the cylinders with break fluid and have the rear wheel already blocked up to sit for a while.Question 3:Distributor turns opposite from the gad distributors right,so would the hyd. pump work on my M or not,I an guessing not?Pulling valve cover in hte morning,hope it looks good in there!Thanks!

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Geoff

11-26-2003 07:54:17




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 Re: Super MD Questions in reply to 49 Cubber! , 11-25-2003 14:54:27  
The other question about the hydraulic pump. You are correct in assuming that an M pump will not work, as the pump on the MD turns CC and the mounting bolts are completly different. Have fun!



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Haas

11-25-2003 18:48:00




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 Re: Super MD Questions in reply to 49 Cubber! , 11-25-2003 14:54:27  
The switch in the front chamber in the manifold is for the ignition. It is connected to the gas/diesel switch over lever and cuts off the ignition when in diesel mode. Also connected to the switch over lever system are butterflys in the manifold to shut off airflow through the carburetor when in diesel mode and a system to lock the carb float up to stop gas flow when in diesel. All this in addition to the decompression valves for lowering compression for gas operation.

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Ron in Nebr

11-25-2003 18:20:34




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 Re: Super MD Questions in reply to 49 Cubber! , 11-25-2003 14:54:27  
Never been around an MD, but if those engines are anything like the bigger 650D gas-start deisels, those two electrical terminals on the intake manifold are a switch that supplies voltage to your coil when it's in the gas mode. When you switch over to diesel a linkage inside the manifold opens the switch, cutting power to the coil. You can test it with an ohmmeter- when the levers are in gas position it should have continuity(sp?) and when in deisel it should be open. On a side note, the 650D I bought two weeks ago was stuck also, and an old tractor mechanic told me to take the starter off and pry the engine backwards(opposite normal rotation) with a crowbar to unstick it. Along with spraying some PB-Blaster in the cylinders, by doing this I had it unstuck and running the same day I brought it home(your results may vary!). Good luck!

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