Started searching here for opinions on the 6PK-2415 replacement - came across this thread.

Am currently changing out the belt tensioner and related parts on my M103 motor.

This too made no sense whatsoever...."bypassing the top center tensioner pulley".

Got a big surprise when I looked at the belt I had taken off the car.

Conti Tech 6PK-2415 ?????

None of my pulleys were bypassed - car is equipped with a/c. I remember reading years ago that there were 2 different belts - one for cars equipped with a/c - one for cars with no a/c. Suspect the latter belt was on european-only models.

Maybe there are differences in the various M103 systems - but for whatever reason - the Conti Tech 6PK-2415 has worked fine on my a/c equipped M103 motor since 2003 - again no pulleys bypassed - factory belt routing diagram followed.

The side-note you see at every MB WEB Parts site - 6PK-2415 replacing 6PK-2612 - mentions a SAAB bulletin. Perhaps a SAAB-only issue?


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Update - decided to pull out my "Service Manual M103 Engine" manual - S-2421-103. Service task 13-342 - Checking condition of poly V-belt and renewing.

Length of belt without refrigerant compressor - 2170 mm

Length of belt with refrigerant compressor - 2255 mm

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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"