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TEF20 Injection pump refitting and timing

A

AlistairCliff

New User
Afternoon.

I am rebuilding a TEF20 which I stripped down completely. Rightly or wrongly I removed the original injection pump and I'm now at the stage of having to refit it, with the correct timing.

Can anyone offer any advice on how to do that? I currently have the cylinder head off so can see piston positions very accurately. The pump seems to be working fine (1,3,4,2) as expected when turned manually.

Many thanks
 
(quoted from post at 09:48:03 02/19/21) Afternoon.

I am rebuilding a TEF20 which I stripped down completely. Rightly or wrongly I removed the original injection pump and I'm now at the stage of having to refit it, with the correct timing.

Can anyone offer any advice on how to do that? I currently have the cylinder head off so can see piston positions very accurately. The pump seems to be working fine (1,3,4,2) as expected when turned manually.

Many thanks
Click to expand...

Are you sure the pump is matching the pistons when they are on the compression stroke TDC, not TDC at the end of the exhaust stroke? Valve position will confirm which TDC it is on.
 
When I rebuilt my TEF20 engine a friend of mine came and spill timed the injection
pump as that is the only way you can get the timing right. MJ.
 
Thanks Jim,

Really helpful. Assuming I get the cylinder head back on, and the valves tell me whether it's compression/decompression, how do I go about refitting the pump? I understand that spill timing is required to make
the finer adjustments, but I need to get the very basic pump position right. I guess my question is, at what point of the compression upstroke should the pump inject/cut off?

A
 
Are you aware of the timing as per picture?

Bob...
cvphoto78775.jpg


cvphoto78776.jpg
 
I am. Thank you, though your image is a lot clearer than mine!

I left the timing chain alone, with all marks aligned. My issue is knowing how the injection pump springs etc should be set before I bolt in back on to the tractor. i.e. should the spring/piston on the pump be on number 1 when the engine is compressing on piston 1, and if that is the case, what stage of that piston movement should everything be at before I bolt it all on.

I'm very new to this part. The pulling apart bit was easy!
 
With both valves closed, and front piston coming up on compression stroke the front pump tappet/plunger will be coming up also. The spill timing is done with the delivery
valve and spring out, pump rack in run position. I'm not sure what engine timing spec is, but let's use 20 degrees BTDC for example. At 25 BTDC the pump outlet SHOULD
have fuel flowing out, and flow should just stop when engine is turned to 20 BTDC as plunger JUST closes off the barrel inlet port if pump timing is correct. I usually
back engine up to about 40 degrees BTDC so flow starts again, then turn engine slowly until flow just stops to re-check the setting. This method is for PORT CLOSING
injection pumps which are common. The PORT OPENING pumps are done differently. Also note rack MUST be in run position, if in STOP position flow will NEVER stop to set
timing.
 
That is VERY helpful.

I could do with knowing how the stage before that works. When it comes to refitting the pump at the very basic of stages how should the pump be set in relation to engine position. I don't want to put the pump on with the tappet/valve on number 4 working when the engine is on piston 1! Apologies for the ignorance on this!

Another quick question. Should TBC be the very very top of the cylinder liner? At the moment the locator hole in the flywheel stops the piston about a centimeter below flush, level with bottom the valve inlet/outlet recess.
 
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