JD650 - Timing tool

[sporteus-HT]

Installing a new fuel pump this weekend. Seems pretty simple except for the timing, that still baffles me a bit. Tried to check it last weekend and never quite got the result I expected based on the tech manual. However, that was the old pump and since I'm pretty sure its screwed, that may be why it wasn't behaving as expected.

One question I have is the timing tool that the manual says you can make. I made one out of my old fuel lines (CH17556 ) that I'm replacing, but then reread the manual and noticed that it actually says to use a fuel line from a different John Deere tractor(CH18358). Would that make any difference? I'm wondering if the fuel like they specify has a larger i.d. or something. Just want to be sure I have the right tool for the job.

 

[winston-HT]

Never seen or read the John Deere manual so don't know just how they describe the procedure. I used clear tygon tubing when I installed a new pump on my old Yanmar 2002D. I don't think the 650 is any different.

If not to lengthy maybe you could tell us the procedure the manual gives. I would sure be interested. I know it was difficult for me to know the exact time of fluid movement in regard to the timing marks.

 

[sporteus-HT]

Well, was going to attach a snapshot of the tech manual with the timing tool, but I can't seem to attach anything. So, I copy/paste the timing procedure. (please forgive OCR errors)

1. Shut off fuel at fuel filter and disconnect No. 1 injection line from pump.
IMPORTANT: Remember that No. 1 cylinder or injection line is the one closest to engine flywheel.
2. Unscrew delivery valve holder (A) from pump. Remove spring (C) and delivery valve (D).
3. Reinstall holder and copper washer (E) and tighten securely.
4. Install JDF-14 Adapter (A) with a sufficient length of rubber hose (B) to allow running fuel to clear tractor, or Injection Pump Timing Tool (Fabricated) on delivery valve holder. (See instructions for making Injection Pump Timing Tool in Specifications and Special Tools, Group 00, in this
Section).
5. Place a ratchet with 27 mm (11 /16 in.) socket on crankshaft pulley.
NOTE: If tractor is equipped with front PTO, engine can be rotated by placing a wrench on the PTO pulley caps crews.
6. Rotate engine clockwise (as viewed from front of tractor) until No. 1 piston approaches TDC of its compression stroke.
7. Place a small container under JDF-14 Adapter with hose to collect fuel. Turn on fuel supply.
NOTE: Since the delivery valve was removed from the pump, fuel will flow from timing fixture in a continuous stream, but will stop at a point of crankshaft rotation. The point at which the fuel just stops flowing is known as "beginning of injection".
NOTE: If the fuel does not stop flowing, even when the TDC mark ( B ) has passed the pointer, it is an indication that No. 1 piston was on the exhaust
stroke instead of the compression stroke.
8. Rotate engine until fuel flow just stops. During this step, the fuel flow will change from a steady stream to droplets, and then stop when the beginning of injection point is reached. Disregard the last drop of accumulated fuel from the end of hose.
9. Check position of beginning of injection mark (A). If pump is correctly timed, beginning of injection mark will be aligned with pointer on timing gear cover.
1O. If mark has gone past pointer, remove shims from between pump mounting flange and timing gear cover.
11. If mark has not reached pointer, add shims between pump and timing gear cover.
A 0.1 mm (0.004 in.) shim change corresponds to a one and one half degree difference in crankshaft position.
NOTE: Beginning of injection mark is at 22±2 degrees before TDC on both 650 and 750 Tractors.
12. When pump timing is correct, remove timing fixture and rubber hose.
13. Install delivery valve (D) in housing while wet with clean diesel fuel. Place a new rubber 0-ring (B) on delivery valve holder. Install spring (C) and NEW copper washer (E) in holder and install holder on pump. Torque to 42 N.m (31 ft-lb).
14. Loosen holder i/4 turn, then retorque to 42 N.m (31 ft-lbs). Connect fuel lines to pump and torque to 27 N.m (20 ft-lb).


When I tried to do this with my "timing tool" made from my old fuel line, I just couldn't get it right. I put in the same number of shims that were there previously even though it was a brand new pump (it started, but sounded like the timing was off to me). If I just rig a clear hose with appropriate diameter to the injection pump connector, is that all I really need to do? I don't really understand how this procedure should work and trying to judge the fuel flow is kind of a PITA based on my experience.

 

[winston-HT]

I agree it is very difficult to determine just when the fuel stops moving in relation to the timing marks. When I changed pumps I removed it many times and changed shims trying to determine correct timing. Sounds to me you are doing it correctly. Long thread and might not help but here was my experience. <LINK_TEXT text="http://www.tractor...el-injection-pump-experiment.html</LINK_TEXT>

 

[sporteus-HT]

So, the tractor is all back together, seems to run fine, and no smoke. I can't find a mobile mechanic to come check the timing for me, so I'm just not going to worry about it. Time to move forward with other repairs. Onward and deeper in debt! <E>:lol:</E>