156617-3300 ZEXEL 9 423 617 305 BOSCH UNION NUT 9423617305 1566173300 1157891790

Introduction
The design of the groove for the O-ring has changed. The proper O-ring should be used in order to match the design of the groove.
Illustration 1 g00715900
(1) O-Ring seal
Illustration 2 g00716166
Old O-Ring grooveUse with 9X-7680 O-Ring Seal
Illustration 3 g00716168
New O-Ring grooveUse with 033-6039 O-Ring Seal
Table 1
O-Ring Part Numbers    
New Part Number     Old Part Number    
033-6039     9X-7680    Improved Kits
One extra O-ring of the new size will be included within each kit. The affected kits are listed in table 2.
Table 2
Part Number     Description    
138-6256     Seal Kit    
154-6732     Fuel Injection Pump Kit    
166-5985     Unit Injector Hydraulic Pump Compensator