Mccormick b250 won't start

Bully1

Member
Just a thought on the pump next to number 4 is there a plug that sits in side the diaphragm housing and blocks the fuel as when I crank the engine I did notice some small air bubbles coming from the diaphragm housing plate and where it mounts to pump?
 

Mur Huwcun

Member
Livestock Farmer
Location
North West Wales
Going to have to buy a new hand primer I think but won't start on 3

Rig up a temporary fuel supply higher than the fuel filter, this will eliminate the primer pump or just blank the return to tank off momentarily to try. A nail with the correct size head in the fitting by the tank will do and just dont overtighten it
 
I mindfull that all these suggestions are being thrown about but as there was no filter in for a while could some muck gone in to the fuel pump and blocked the orifice in no4 pump barrel. It might have gone all the way down the fuel gallery and either got to the end and blocked the gallery altogether or the actual hole into the pumping chamber.
 

Bully1

Member
I mindfull that all these suggestions are being thrown about but as there was no filter in for a while could some muck gone in to the fuel pump and blocked the orifice in no4 pump barrel. It might have gone all the way down the fuel gallery and either got to the end and blocked the gallery altogether or the actual hole into the pumping chamber.
Took the delivery valves out last night and yes it had dirt and some red paint chippings but fuel flow is the same out of all of them and tonight I got it running at last
 

Bury the Trash

Member
Mixed Farmer
Possibly the tank could do with a good sort out. .......Although its a fair bit of work - taking the tank off helps being able to swill /tip upside down to thoroughly clean.
 

Scyyb

New Member
Hello from Finland,
I have to say thank you all. I had starting problem in my -59 McCormick B275. I follow up all instructions in this conversation and i found the problem. It was in the stop lever.
I was little worried about starting because winter and snow is coming...
 

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Jezz40

Member
Hello all I have a B250, So brief History, when I got the tractor it ran but not great, alot of blowby and over heat after a good workout, Still slowly managed to plow my field before winter, Did notice decline of power slowly towards the end of the season, ran better after installed the glowplug coversion, Still power loss when reversing and working really. Then Full shut down, Rebuilt the engine, Sleeves were good but new pistons Bearings and rings, a few were broken and 3 bearings from before but still ran LOL. Now its all together but seems its a fuelling problem, cleaned all the lines, pump looked at, all valves move diesel comes out at injectors but No power stalls under load. trying to reverse with a simple harrow lifted will pretty much kill it, Still tries to ever heat aswell, new water pump was installed and thermostat. the 3,4 injector line leak from the threads at the top of the pump, where the flared head is for the valves, also the kill lever fully pulled the the stoppers rotate to the front of the engine, when pushed in they are at 90degrees, When I pull the stop lever out from the pump a bit they come full 180 and then try to start you get black smoke and grunt when trying to start :) but it returns to 90 on its own and no smoke or power, I am thinking the leak on 3 and 4 I have no idea why it would leak out of the top of the pump, the lift pump ?
 

Jezz40

Member
Hello all I have a B250, So brief History, when I got the tractor it ran but not great, alot of blowby and over heat after a good workout, Still slowly managed to plow my field before winter, Did notice decline of power slowly towards the end of the season, ran better after installed the glowplug coversion, Still power loss when reversing and working really. Then Full shut down, Rebuilt the engine, Sleeves were good but new pistons Bearings and rings, a few were broken and 3 bearings from before but still ran LOL. Now its all together but seems its a fuelling problem, cleaned all the lines, pump looked at, all valves move diesel comes out at injectors but No power stalls under load. trying to reverse with a simple harrow lifted will pretty much kill it, Still tries to ever heat aswell, new water pump was installed and thermostat. the 3,4 injector line leak from the threads at the top of the pump, where the flared head is for the valves, also the kill lever fully pulled the the stoppers rotate to the front of the engine, when pushed in they are at 90degrees, When I pull the stop lever out from the pump a bit they come full 180 and then try to start you get black smoke and grunt when trying to start :) but it returns to 90 on its own and no smoke or power, I am thinking the leak on 3 and 4 I have no idea why it would leak out of the top of the pump, the lift pump ?
ALSO, the lift primer pump does not work anymore
 

Mur Huwcun

Member
Livestock Farmer
Location
North West Wales
Have you had the side plate off the injector pump for a look? Dies the rack move freely? Are your vacuum pipes in good order? Have you got the air filter connected, it does make a difference with the pneumatic governor. Have you changed the oil in the pump? One of mine broke the springs on the plungers in the inline pump. Have also had them stick up or stiff up and not injecting fully on some cylinders.
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As reported in Independent


quote: “Red Tractor has confirmed it is dropping plans to launch its green farming assurance standard in April“

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