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Discussion Forum

IHC 784 Tractor D246 Diesel Motor (German Motor)

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Brian M. Bideau

04-24-2001 19:11:38

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I just had this 784 tractor (D246 motor - German motor) overhauled including a full rebuild of the Bosch "CR" injector pump and new injector tips. Before the OH the tractor would start up easy and not make much smoke. After the OH the tractor puts out a lot of smoke after starting until it is warmed up, and right after starting the tractor was missing for 15 to 20 seconds after startup. I did not accept the tractor as it was and told the dealer who worked on it to come get it, which he did. The dealer didn't do anyting to the Bosch pump after I sent the tractor back (the dealer had in connection with the OH sent the Bosch pump out for a rebuild), but said he found one injector which had 400lbs lower
preasure than the others and he fixed that. I told the dealer not to bring the tractor back until I came in to start it at the dealership, which I did today. The tractor starts up and still makes a lot of smoke until it runs for a minute or so, much more smoke than it ever did before the OH. The dealer says "this German motor is one of the dirtiest starting motors there is" and he says the motor is OK and the injector pump is OK. He says don't worry about it (the excess smoke, etc. during startup). But, upon starting the tractor makes much more smoke than it ever did before the OH. I question whether the right injector tips were installed, or if the Bosch "CR" injector pump rebuild was correct, but the dealer says everything is fine. The tractor still misses a little for 10 or 15 seconds after starting and puts out lots more smoke until warmed up. The tractor never did this before the OH. If what the dealer says is correct, that this is just the way this "dirty starting German motor is",then in my opinion this German motor isn't worth a darn and I am sorry I spend the $5,000.00 for the OH. Anyone out there have a "German Motor" IHC tractor like a 784? This is a British built tractor and is a 1982 model. I had it OHed because the front seal was leaking, the throwout bearing was shot and the tractor was putting an oily mixture out the exhaust and leaking that mixture around the exhaust manifold. Are these tractors (German motor) all this way? Anyone? My regular Email is helper@chanuteks.com

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Les Repair

04-25-2001 17:37:14

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 Re: IHC 784 Tractor D246 Diesel Motor (German Motor) in reply to Brian M. Bideau, 04-24-2001 19:11:38  
I think the compression ratio is lowered on the replacement piston kit. Thats why the smoke and hard starting in cold weather. If you set the valve stand out to where the valves are flush with the cylinder head that will give some compression back. Been there Done that. Your MR CASE IH dealer won't like to hear that though.

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Brian M. Bideau

04-26-2001 07:23:29

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 Re: Re: IHC 784 Tractor D246 Diesel Motor (German Motor) in reply to Les Repair, 04-25-2001 17:37:14  
The tractor did have a replacement sleeve and piston kit put in it, no otherway to do the overhaul that I know of. The valves and seats were also grownd. A lower compession ratio I could believe. Could you elaborate (explain) a little more on the "been there - done that" comment? Do you mean that you had a tractor with this exact same problem? What did you do and how did you do it? My local Case/IH dealer says that they did all they were supposed to do and that the tractor is fine? Is there a means to check the compression in the cylinder without taking the injector out?

Thank you

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04-25-2001 15:46:39

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 Re: IHC 784 Tractor D246 Diesel Motor (German Motor) in reply to Brian M. Bideau, 04-24-2001 19:11:38  
We've got both the 310 and 358 German Diesels. They both smoke quite a bit until they warm up, but once they do the exaust clears up. Does the engine smoke more while idleing? The German diesels run their best running wide open or with a load on them. If you still think your engine is smoking too much you might want to try replacing the thermostat.

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04-25-2001 10:41:38

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 Re: IHC 784 Tractor D246 Diesel Motor (German Motor) in reply to Brian M. Bideau, 04-24-2001 19:11:38  
I do agree with the dealer on the smoking of these engines. We have a 756 with the D310 in it, German built. At start up it smokes a lot. We have to drive it out of the shed, or you won't be able to see in there. It runs good, and has lots of power. We weren't conscerned about it when we bought it, and still aren't. My cousin had a 686 and 784 with the german diesel in them, and they did the same thing. They both ran well, and had lots of power. In my opinion, I wouldn't worry too much about.

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Brian M. Bideau

04-24-2001 19:13:58

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 Re: IHC 784 Tractor D246 Diesel Motor (German Motor) in reply to Brian M. Bideau, 04-24-2001 19:11:38  
There seems to be a few messages here on this discussionboard about the German motor IHC tractors, but not much. Anyone out there who knows about these motors/tractors please post and try to help for us all.

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04-24-2001 19:36:57

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 Re: Re: IHC 784 Tractor D246 Diesel Motor (German Motor) in reply to Brian M. Bideau, 04-24-2001 19:13:58  
You might try posting this question on the forum at redpowermagazine.com. Here's the link:

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