help; timing b250 injector pump

maccormick man

New Member
hello;
recently purchased b250 maccormick. didnt have injector pump,so ibought one off of 275.
need help on how to time injector to engine.im not familiar with ih.
info apreciated.
 
Location
Suffolk
I would imagine from the engine side you would need to find Top Dead Centre on no 1 piston, that's the easy bit. You will then see a timing mark on your flywheel in a particular place, this may be a little harder. Then you will need to consider the firing order; 1243 or 1342. I seem to remember IH's have them on a casting..... 250's, 414's & 614's were the tractors of my yoof.
The next part is to look into SPILL TIMING, this is the relationship between the injector pump and the fuel being metered through it. You need to read this to understand;http://vintagetractorengineer.com/2009/01/timing-tractor-injection-pump-using-spill-cut-off-point/ There are other bits of information on this out there on t'internet too:)
You can then match this information to your engine and bolt in the pump. Then you can see if the injector pipes line up in any way (if you still have them & I hope so!) and the engine should run....(y)
SS
 

maccormick man

New Member
Thanks for the help: I had a little time after work to play with b250,figured out no.1's cylinder's compression ,and no.1 injector's spill point ,,,,,i think,,,,,anyway got her bled. Hope to try things out by weekend. I set the pump to its spill point ,then found one cylinders top .The fly wheel cover is on bottom of engine, and has three dots that are dead bottom,but nothing to lineup with,the front pulley has a knotch that lines up with a pointed stud,,,,,, does this sound about right? Then I bolted pump to gear,,putting the bolt plate pointing centre to adjustment marks on gear. Am I making any sense? So then i just finished bleeding the injectors at the end of the lines. So the injector should just fire,prior to one cyl's top?
 

Hedge Hunter

Member
Location
Near the sea
service manual says that the optimum timing is 20 degrees BTDC. Although 20 is optimum, timing can be retarded as far as 16 degrees BTDC in cases where engine noise is critical and power requirements are not exacting. However, timing should not be advanced more than 22 degrees BTDC or max power will be reduced and glowplug failure will be increased.


You can check the pump timing as follows:
1. Shut off the fuel and remove the injection pump timing window and clutch housing dust cover.
2. Turn engine in direction of normal rotation until the No. 1 piston is coming up on the compression stroke. Continue turning until the "TDC" mark on the flywheel aligns with the scribe mark located on the left front flange of the clutch housing. 3. Check the timing marks on the engine front end plate and pump mounting flange. 4. If alignment is required, loosen nuts on pump mounting studs, align the mark on pump mounting flange midway between the two marks on the engine front end plate and retighten the nuts. At this time, the "E" scribed line on injector pump rotor should align the scribed lines at the lower hole of the pump snap ring. These marks are visible after removing a small cover panel at the main drive gear. 5. Note: Movement of the pump between the two scribed lines on the engine front end plate gives a variation of about 3 degrees.
 

Mursal

Member
I think, clockwise looking in from the front, would be normal direction of rotation.
It probably will have difficulty (retarded) to start, if it injects at TDC, plenty of white smoke. But it wouldn't be a bad start, if it starts.
@Hedge Hunter has everything covered to get required advancement before TDC
 
Last edited:

Hedge Hunter

Member
Location
Near the sea
I think, clockwise looking in from the front, would be normal direction of rotation.
It probably will have difficulty (retarded) to start, if it injects at TDC, plenty of white smoke. But it wouldn't be a bad start, it is starts.
@Hedge Hunter has everything covered to get required advancement before TDC
....... If you have no mark to go by except the pulley TDC mark you will have to spill time the pump, you will need to have the marks line up with No1 cylinder on compression stroke, with the pump fitted and the cam about to raise the plunger on No1, have the fuel supply lines connected and bleed the pump, you have to remove the delivery valve from No1 on the pump, remove the holder, (the nipple the injector pipe fits on) inside you will find a spring and a valve, note the position they are fitted, remove them and screw the valve holder back and nip it up, prime the lift pump, fuel should flow freely from the no1 holder, if not it is too far advanced, turn the pump shaft the opposite way than it normally turns till the fuel flows and a little bit more, now turn the pump shaft in the normal direction till the fuel just stops and lock it, pull the engine back a bit and the fuel will start flowing again, now turn the engine in the normal direction till the fuel just stops and check that the marks match up, if so the pump is now timed, put the delivery valve and spring in and tighten the holder, put on the injector pipes and is should start. Note that the engine can be on compression stroke on No1 or No4 when the pulley marks are lined up so you need to make sure its firing on No1 otherwise you can be a turn out.
 
Little tip I found when using spill timing to set up an engine. Get some windscreen washer hose the clear plastic type, take a six inch length and heat about an inch from one end with a fag lighter until soft then give it a long steady pull. If the temperature is right you can get a very thin long piece of tube. Fit the other end over your pipe to be timed and you get an easy to see and accurate indication of spill point. Screw everything back together and then set it up by ear!!!!!
 

maccormick man

New Member
I hope to get some time at this tomorrow ,,,i believe I've got the timing at least on the right slot,, so i just have to narrow down the plus minus twenty. Haven't got it to kick yet,,,but with so many unknowns,,,there maybe more issues than I originally thought! I.E. The glow plugs,,,injectors,,ect. If all fails I'll do a compression test,and so on,,,
 

Daveh

Member
Location
Oxon
hello;
recently purchased b250 maccormick. didnt have injector pump,so ibought one off of 275.
need help on how to time injector to engine.im not familiar with ih.
info apreciated.
Thought the pump could only go on one way on the shaft, been a while since i played around with one though.
 

maccormick man

New Member
That's pretty much what I found ,,,it would only bolt up in one position. Which is where no.1 cyl and no.1 injector are lining up. The holes just won't work in any other position,,,, i tried a few just to be sure. Tried it the other day ,,,,,don't think I had the plus , minas quite right,,,then glow plugs failed ,,,,blew dash fuse. Life's good
 

maccormick man

New Member
help,,,,,ive been trying to get registered on the classic machinery network to down load manuals,,,, keep telling me my account is inactive ,,,that i should contact site administrator,,,,oh but how when i cant log in,,,,, any one know about this ?????
 
Location
Suffolk
All those old INT engines liked heat. They never failed to start but they liked a good one minute and you could see the pepper pot on the dash glow a lovely deep red. Count sixty in thousands, while you are twisting the lever, that'll give you a minute; one thousand, two thousand.....etc.
Make sure your pepper pot has its wire element inside:LOL: This will help. Plus the heaters themselves are all working. Unlike my Deutz there are four on your engine.
SS
 

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