Fuel System - High-Pressure Pump Leaking

High-pressure pump leaking

Topic number LI07.02-N-048800

Version 1

Design group 07.02 Injection pump, unit pump, high pressure pump

Date 02-18-2010

Validity Engine 646 in model 639 and engines 642/646 in model 906

Reason for change

Reason for block

Complaint:
High-pressure pump leaking in the area of the low-pressure connections.

Cause:
Leakage at the connecting point between fuel hose and high-pressure pump connection pipe, caused by low outside temperatures.

















Remedy:
Do not replace the high-pressure pump (1) !!!!

1. Check whether the poly-V belt is contaminated with fuel.

2. If it is contaminated with fuel, replace poly-V belt. (See AR13.22-S-1202S).

3. In order to localize the leak on the high-pressure pump (1), clean the high-pressure pump (1) and spray it with MB leak detector spray.

4. If the high-pressure pump (1) is found to be leaking in the area of the low-pressure connections:

^ Replace hose clamps and fuel hoses (2) of feed and return lines of low-pressure connections.

Note:
Only use the specified hose clamps.