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It is right after the section on pump rebuilding in the Intermediate / Depo level TM -34 Looking at the TM-5-6115-584-34 for the 002A ( 003A is the same ) it is on page 7-39 and 7-40 You want the test they refer to as Timing method 2 Flowing the pump. If your plunger guide skipped 90* or 180* I...

Here is a picture of the PSU plunger from the TM. It's about 5/16" diameter with a slot on one end, the thru-hole is for the drive pin ( which is why they snap right at that hole ) It pumps the high pressure fuel, so the diameter is precise and polished, I presume hardened based on how they...

No, you can not pull the plunger out. You need to disassemble the pump to take the plunger out. As long as it's rotating and pulsing that's enough for now. If the plunger guide or drive pin in the case of a PSU was broken the plunger would not turn. Your assembly sequence is correct. I'd put it...

Maybe you also need to look at the suction side of things and see if you have a loose fitting, cracked line or other point where the pump could be sucking in air instead of fuel?? The smallest air intrusion will cause all kinds of problems!

Absolutely, the Ambac M-50 will drop right in, just need to check the timing button thickness. Everything else is the same. I'm actually considering taking apart a good PSU ( have 1 good machine with a PSU in it ) and taking the plunger to a machine shop to see about the possibility of getting...

To Justacitizen's point, I would have to agree that often times a machine with 1-2K hours often run better than those that have sat around doing nothing and only have a few hours. They seem to start easier, run smoother and perform as they should. Don't get too hung up on age or low hours, judge...

Here we go... side by side photo. Finger is pointing to the screw in the PSU pump. That is the only visual difference on the outside that I know of.... besides the Tag.

The only external visual difference is the large flat head screw pointing straight down from a boss cast into the center of the main body housing underneath. PSU has the screw and M-50 only has the undrilled boss cast into the housing. I have several " Junk" pumps lying around ( unfortunately )...

Uh, Oh! not a good sign. Now look closer and see if is says M50 or PSU on the tag. We recently found a case where a member had an early M50 that was actually built by Bosch in Italy and had a black tag , prior to Ambac taking over and using blue tags. The M50 is a serviceable unit, the PSU...

Once you confirm the delivery valve is ok, you can try doing the static timing test as described in the TM. This may show you if the plunger guide has skipped or not. I would assume that you will find the timing to be completely wrong if it has. While you are in there, try doing a visual check...

Was it a silver cylinder about 2" long and 5/16" diameter with a black wire coming out of each end? One wire attached to the mounting screw on the end of the terminal block? If so, that was a factory installed capacitor.

I know you say you have had it running fine before, but have you load tested it? If so what were the results? The motor has a slight sound of either low compression in 1 or more cylinders or possibly 1 or more dead injectors or otherwise dead cylinders. I would imagine both of these conditions...

In the video the batteries are not your problem, it's cranking fine. Although after so many failed starts you now may need to charge them again. I think you idea of sluggish is not what Guy was thinking, he thought it was cranking slow, which its really not. In the video each time it dies is it...

You don't need to test with the lines totally disconnected, just loosened. Things may look a little different than I described if the lines are removed completely off the injectors.

There's no way to mess up the timing just by taking out the cap and delivery valve, but if it didn't go back in right you could be getting lots of low pressure fuel instead of a tiny amount of high pressure fuel. The spurts will be TINY, barely a few drops per cycle, you will not have fuel...

Well, oil does not turn into coffee milk shakes unless the motor had been running with water or antifreeze in the oil, it would not look like that just from sitting and getting water in through the flap. Luckily you motor still turns, but you should test your head gasket. Compression test may...

Electronics can often do strange things as their components start to warm up a bit... might be an indication of something that's about to fail completely.

Glad you had a safe and non-eventful trip! You will probably get lucky and have no problems. I've bought plenty of "non-runners" that didn't really need anything other than fuel, oil , filters and batteries, hope you have the same luck!

Off the subject Chief, how's your surgery recovery going? I'm going under the knife next Monday the 9th for bi-lateral hernia surgery. Doc says no lifting more than 25 lbs. for 6 weeks! Like that's gonna be possible! I had foot surgery like 10 years ago and was outside in the snow that...

A couple years ago I had a customer that had found a 200ish. gl tank trailer in Texas and shipped it to RI. It appeared to be Ex-military. I was a steel box about 4' x 6' by about 8" or 10" deep. basically a tank on wheels. It had a fuel level gage , dip tube and return / vent fittings. Mounted...