Replacing throttle shaft bush.

This information is free for you to use, any repairs are solely the responsibility of the repairer.

This page shows how to carry out a replacement of the throttle shaft bush on a Bosch VE pump. This procedure can also be used when replacing the governor cover seal and throttle shaft 'O' ring. There are many more information sheets available and a list can be found on the DIY Work sheets page.

Before you begin, the fuel pump should be drained of any fuel If you are attempting to carry this repair out in situ, place a plastic bag underneath the pump to catch fuel as it escapes when lifting off the top cover. Also if the starter or alternator are in close proximity it would be prudent to cover these. 




If the reference marks are difficult to see make your own. Remove 10mm nut, washer, lever, spring and plastic retainers.
After taking this measurement, remove the fuel screw.
The governor cover is now ready to take off. Remove the four retaining screws. Gently push the shaft through the housing using your thumb, at the same time raise the governor cover away from the main pump body.
Using a mandrel or suitable punch, press out the old bush.
Press in the new bush, ensure the bush goes in straight. A small amount of nut lock can be applied to the bush prior to insertion.
Apply a light amount of grease to the throttle shaft and seal, replace the governor cover gasket. Push the shaft through the new bush. Realign the governor cover and install the four securing screws.
If the throttle assembly becomes detached from the throttle arm. Follow the instructions shown here and in the following picture.
Ensure the throttle assembly hooks into the governor arm.
Shaft must pass fully through the bush. Refit four securing screws.
Reinstall the maximum fuel screw and set to the measurement taken during disassembly.
Install lower plastic retainer,correctly position the throttle return spring. Refit the upper plastic retainer.
Refit the throttle lever. Refit spring washer and 10mm nut
Re-attach the return spring to the throttle lever.
Job Done !
Dimensions of Mandrel.

Write a new comment: (Click here)
Characters left: 160
DONE Sending...

Nick Crowhurst | Reply 29.08.2018 10:22

On my 1990 TDI Discovery there was a hard steel anti-tamper sleeve on the "maximum fuel adjustment screw". I removed this with a grind stone in a Dremel.

Ads | Reply 19.04.2018 09:56

Should read stud lol
Bloody predictive text

john | Reply 19.04.2018 09:36

What to do if you have a really tight allen head bolt?

john 19.04.2018 10:47

Thanks will try that,thought that might be the answer ,but thought I would check....Cheers John

Ads 19.04.2018 09:55

If release oil WD40 doesn't work. I am afraid a little force may be required,
Try using a light hammer and punch directly to the head of the students.

Ads | Reply 31.03.2018 09:36

New into old tolerances etc
If the vehicle performs OK then simply reset the idle speed.
If the vehicle is lacking power turn in the fuel screw 1/8th of turn.

Ash P | Reply 30.03.2018 19:31

Just done mine with some success.However-I didn’t touch a single screw & put the throttle plate back in the exact same position but idle has dropped by 200rpm?

Marco Leunk | Reply 25.10.2017 21:19

It's running without any spills off diesel fuel 👍
Thanks for the input.
Greetings , Marco

ADS | Reply 22.10.2017 15:20

Screw max fuel screw all the way in to the spacer sleeve. Then back off half a turn.
Then operate the throttle spindle as mentioned in previous massage.

Marco 22.10.2017 17:41

Thanks, I will try that.

See all comments

| Reply

Latest comments

25.04 | 14:11

I need to know more of Benz engines

25.04 | 14:07

It helped me too much

21.04 | 17:10

avete gli iniettori per un escavatore JCB 8016?

03.03 | 12:40

Hi I am after the instructions for a repair kit I purchased from you

You liked this page