Marbed 9529 – 33-Spline / Serrated Socket for Delivery Valve Holder (1/2" Drive)

Marbed 9529 is a professional splined / serrated socket insert designed for the removal and tightening of the delivery valve holder (pressure valve holder) on Bosch PES-M in-line diesel injection pumps used on many classic Mercedes-Benz diesel engines.

This tool is commonly required during service operations such as:

• replacing the pipe connection

• servicing the pressure valve / delivery valve assembly

• replacing copper sealing rings

• leak repair around the delivery valve holder / outlet connection

It is the Marbed aftermarket equivalent to OEM special tools Mercedes-Benz 617 589 01 09 00 and Bosch KDEP 1044 / 0986611623.

Key Features

• Tool type: Splined / serrated socket insert for delivery valve holder (pressure valve holder)

• Spline profile: 33-spline / 33-tooth (33 point)

• Nominal outer diameter: ≈ 19 mm

• Drive: 1/2" square drive

• Application: Bosch PES-M in-line injection pumps (delivery valve holder / pressure valve holder)

Note: exact dimensional verification for specific pump versions is available on request.

Compatible Injection Pump Families

Designed for use on Bosch PES-M in-line injection pumps, including:

• PES-4M

• PES-5M

• PES-6M

Engine Applications (Mercedes-Benz Diesel)

Commonly used on pumps installed on Mercedes-Benz diesel engines including:

• OM601

• OM602

• OM603

• OM605

• OM606

• OM615

• OM616

• OM617

(Engine listing is intended for search and identification; actual fitment depends on the specific pump configuration.)

OEM / Cross Reference Numbers

This tool is equivalent to the following OEM references:

Mercedes-Benz (OEM Special Tool)

• 617 589 01 09 00

Bosch

• KDEP 1044

• 0 986 611 623

• 0986611623

What This Tool Is Used For (Typical Workshop Jobs)

• delivery valve holder removal / installation

• pressure valve holder service

• pipe connection servicing

• replacing copper sealing rings

• solving diesel leaks around outlet connections

• pump overhaul / bench service on PES-M pumps

Tip: If you need a handled version for better leverage, see Marbed 9730.

Also Known As (Search Terms / Alternative Names)

This tool may be referred to as:

• delivery valve holder socket

• pressure valve holder socket

• delivery valve socket

• splined socket insert

• serrated socket insert

• 33 spline socket / 33 tooth socket / 33 point socket

• socket wrench insert serrated

• notched tooth socket

• Bosch PES-M delivery valve holder tool

• Mercedes injection pump delivery valve tool