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Injector pump timing - opinions

R

Royse

Well-known Member
This tractor ran when I took it apart.
I took these pictures of the timing gears.
It looked to me that the pump was off one tooth.
The pump adjustments are all the way to one side, but
wouldn't they be to the other end of the slot if they were
trying to compensate for being off one tooth?

Now that I'm going to put it back together, would you put it
back where it should be, or put it where it was running before
and leave it be?

I have to time it either way.

Crank and idler gears

mvphoto1505.jpg


Cam and idler gears

mvphoto1507.jpg


Idler and pump gears

mvphoto1506.jpg
 
Well from your very good photos I am inclined to agree with you that IF you put the pump gear where it shows it should be all the slot is going to be used up and doubt that it would run. How did the engine start before, timing sometimes shows up more as a starting issue than as a performance issue. Lots of time off timing will cause one to run hot..also ? Going to be interesting to see what happens. What is the engine?
 
My preference would be to install the gears correctly. Perhaps there is something amiss with the pump mounting, or hub/pump shaft mounting? Another set of holes in the hub, covered up by the gear?
I've had pumps off two of my own engines now that I believe were not timed correctly before. When I removed the pumps, I had things lined up, but did not get real precise on the absolute timing. It was enough of a job getting them just right that I don't think it was done previously. In both cases smoking and fuel consumption improved with proper timing. As you say about yours, both of mine ran before.
 
jm, it seemed to start Ok but did require 30 seconds or more of
running the glow plugs.
Let me give you a little more history.
First, I have never ran it more than 5 minutes or so. I got it in a
trade and it had water in the oil/oil in the water, so I didn't run it.
I do know that the previous owner changed a head gasket once.
It was obvious from the half a tube of red RTV he used on it.
Maybe that blown head gasket was due to overheating, I don't know.
The engine is a 3 cylinder Chinese 25HP diesel. (LangDong Y385T)
Four wheel drive compact tractor with a loader.
 
Good thought Bob, but only one set of holes in the hub.
I took the pictures because I had to take the gears off.
I can see it very well.
The OCD me REALLY wants to put it where it belongs.
The practical me says "it ran there, put it back there!"
I'd sure like to get it right the first time though.
I suppose I can put it on, check the timing and move it if needed.
 
I prefer original view. But modern view is good for some other things. Click on modern view and it will tell you about me.
Unfortunately I'm way northeast of there, but by Fri. night, I hope to be in Troutman NC!
 
Is the pump an inline that can be flow timed? If so that's what I would do, then see if you can center the pump and gear as needed so you can adjust the timing slightly either way if needed.
 
The problem is the last picture right? I will bet that isn't another 'one dot between a pair of dots'...
My hunch is that is a 'zero degree' mark... because there is a number 10 below it. Might be your chance to change the timing to leave slack for movement in the pump.
 
Dieseltech, I'm trying to follow you here, but I'm a diesel novice.
If by flow timed, you mean turning the pump and watching the
flow out the end of the injector line, yes. That's how the book
says to set the initial timing.
 
Yes, last picture Tony. I'll take another look at that gear tomorrow.
The manual has lost a lot in translation, so I'm open to suggestions.
 
sometimes they didn't run right as timed by the marks & a mechanic would move the mark by one tooth in one direction or another to make it run better. I see a slot on the gear, as if you could take the nut off & the slot bolt out, pull the gear out & move it a tooth, then tighten nut & bolts.
 
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