WD40 follow up.

some info on the starting of the wd40. i would not say there is a diesel half and gas half as wondered about. it is a diesel engine that can run on gas when compression is reduced. to start on gas:
turn rachet gear knob so groove is facing you.
this places a cam in pump horizontaly.
engage shut off lever. this opens the four starting valves, enlarging the combustion chambers with the spark plugs to reduce compression ratio.closes large butterfly valve shutting off diesel intake.opens small butterfly valve to carburator. engages magneto. then crank and start engine. engine runs at 700 rpm on gas warming up the engine. after approx 1 min. the starting lever is automatically tripped in the pump closing starting valves, opens large butterfly and closes small one. and also disengages magneto. when on diesel the magneto (F4) never turns, which means it should never wear out. all this is done automatically from gas to diesel. not like the wd9's and so on that were manual change over.
during their time period they had three diff. head designs. first was vertical, meaning injectors were installed straight in from top. then had 10 degree head design, injectors were mounted on ten degree angle. and last they went to the 45 degree angle as the wd9's are.

That is interesting. It is really neat that they switched over automatically.

I didn't mean that the engine had two halves like that. I always think it is kind of neat when you look at an MD (etc) from the right it looks like a gas tractor and when you look at it from the right it looks like a diesel tractor. You wouldn't know there are two completely different systems if you were standing on one side or the other.

I have a TD-40 (same engine as a WD-40) and its pretty slick how they change over automatically. Only IH gas start diesle that does so. everything after '39 was anually changed

was trying to show a pic of the masive injection pump on left side but having trouble sending it.

(quoted from post at 17:24:55 05/24/11) was trying to show a pic of the masive injection pump on left side but having trouble sending it.

Click to expand...

My 40 has the field changeover kit with the single plunger TD-9 style pump on it. mines no good for pics


those original 'suitcase' pumps are just stupid big!