@Ian A leaking pump is a sign that other seals on the pump will soon be leaking as well. However, you can change the cover seal but be very careful and make sure the pump's clean on the outside before attempting repair. May need to take out the full load screw as well (before you put it back in) just to be safe but take note of the measurement.

Thanks for sharing this very helpful information!

@tarquin Pre-stroke is indicated on the calibration test sheet. Maybe indicated on the hydraulic head (K-1). But did you test the pump on the bench? Are the values within specs?

It's included in VE pump tool set. A three sided socket Zexel Part no. 157914-2500 Socket wrench for tightening head plug. Google VE Pump Tools and click the link for Marbed Tools. Can't post here sorry.

i have a question i have a bosh VE pump with the LDA its from a golf mk2 gtd 80hp it used to come with a 8mm plunger but looks like this one was tuned to a 9mm and i was going to put a 10mm i changed it and it wont start i have to be onest with you i didnt calibrated the pump and didnt took of the top or messed with the governor... does it really need calibrating it? and thanks for sharing the knowledge by the way very usefull in doubt as my case ;)

thank you brilliant

Does anyone know the torque specs for the head plug and delivery valve holders?

If you want to see those parts in more detail. kzfaq.info/get/bejne/h92Gh9Bjkr2Renk.html

I have a little leak from the bolt aside the LDA, they told me that it's a vent for the turbo command. and they told me that this leak require pump removal. Is possibile to remove only the cover and substitute orings without remove the pump from the vehicle?

I have a similar pump on a 1985 Mitsubishi 4d55t in a Dodge D50. I cannot get fuel to the injectors. I primed the tank, got fuel to the filter, and fuel to the feed going into the pump, but no fuel comes out of the pump. I tried a small 12v fuel pump but not luck. Could something be blocked or plugged maybe?

I made a mistake and did not loosen the spring tension on the gov arm when i pulled the top governor cover off in chassis on bobcat 843b Isuzu diesel Injection pump # 104641-6131. needless to say when I tapped cover to loosen things flew apart. I looked at your video @ 11:01 I see how the spring from control arm attaches now to plunger which has a dual push spring and small washer on plunger. I was just worried that I may have dropped a part into the pump housing or sump area. But it appears as I have all the parts as they flew into cover and I recovered them. Just wished I had found your video before I took apart. Ok it looks as if I can reassemble now But I may try to run a magnet in sump to make sure. any advise would be appreciated I have a job to do with bobcat so I did not want to wait for dial indicator timing tool otherwise i would have removed pump for a bench job. @ 11:30 you are checking with flashlight the springs you show in @ 10:58 correct both contacts ? explain what you are looking at please. thanks bob

This was helpful but definitely would have been way more helpful if I could see what was happening on the close ups

Nice videos but you need better camera brother

@Nao at least have it mounted on a test bench to see what's it doing. Pump needs to deliver a certain amount of fuel for start. Further more, did you compare the plungers?

Hi, great videos, can I ask a question please , is it possible to remove the rear head unit of the pump without removing the top cover ?

What would cause the plunger shaft to break? I replaced the O ring on the distribution block, got everything lined back up, little disk in place and springs, I was tightening the screws pulling each side down even and I hear a pop! Broke the shaft down below the port slots at the last groove before the thick donut shaped block. Ugh!

please share link of pump calibration video ,,,,,,

Hey, I have a question: My top 2 delivery valves arent getting through any diesel. What could be the cause?

thank you for this video however i would like to know THE NAME OF THE SPECIAL TOOL TO REMOVE CENTER PLUG PLEASE...i need that tool and no one have it and i alreaddy tried whit many other tools whitout sucess and i need to know the name so i buy it but im tired to check in internet and i cant have the name..please the name....thankx

Is it hard to turn the pulley by hand ? i cant turn mine. Does it mean smthg is broken inside ? I just finish reassembling mine.

Only plunger depth checked?

gireesh sahu my truck ve serege 3531 dijal averej low so provlem pamp

I rebuilt my pump and it does not work like it used to with leaky seals. And no one's got infomation on why the pump does not pump fuel to the injector ports anymore and everyone wants to charge me an arm and a leg for this and that and because i don't have that no one wants to help me. You either pay or you don't get help. $550 for a new housing, $1500 for a rebuild, and it's costed me so far $60 out of pocket on the pump. My Dad's work helped me make some bits and pieces to help get my car going, i gorn and helped out occasionally their, and they tried to help me keep it running good as well as paid me a little towards getting new tires. But i want to keep my car in top nick. Good and bad news with the engine pistons have cracks good news from engineering perspective its nothing other then a hair line that won't be a problem for 100*** till 200*** down the road. If i drive hard 100*** and if i am gentle 200*** but that's about 7 years of my driving standard. My question i have to rectify is the 3 sided triangular bolt at the ports side, if i tighten that up will that increase fuel pressure to the ports? I only done it about finger tight last time and the time before that well... I am not sure, my Dad done it. From schematics if fuel took the path of least resistance it would flow back into the pump. And that's the only point i can find to regulate fuel pressure. Do i go dead tight, do i tension it, do i go tight as possible, back it of 35 degrees, whats the actual procedure? I can't tune it so someones going to make a buck when i have it anyway. And i can drive.