Freewheel Clutch/Pulley for alternator. This unit is standard equipment on all Sprinter alternators. THIS IS A CRITICAL COMPONENT OF THE SERPENTINE BELT SYSTEM AND A KNOWN CAUSE OF BREAKAGE PROBLEMS
IT IS COMMON FOR THIS DECLUTCHING PULLEY TO FAIL, LONG BEFORE THE ALTERNATOR WEARS OUT. A special tool is required for installation of this unit and are not usually replaceable outside a repair facility.
If you are purchasing a new alternator, you will not need to buy this, as the alternator is furnished with a new pulley.
This tool is required to remove and replace the decoupling alternator pulleys on all Sprinters, with either Bosch or Valeo alternators and Metris, as well.
ONLY FOR MODELS WITH 220 AMP ALTERNATOR - DO NOT TRY TO USE THIS ON A 180 AMP ALTERNATOR, IT WON'T WORK
If you have had continuing sluggish starts and other electrical problems and you are certain that you have a strong alternator, generating an output of 14V, you may want to look closely at your positive battery cable. This is often a common area of electrical trouble, especially for internal corrosion.
This is often a common area of
electrical trouble and is commonly referred to as the infamous "Y
cable"
The
220 Amp alternators are used on those models with a secondary A/C
compressor (Roof-mounted A/C units). If in doubt, look at the black
plastic backing plate on the alternator. It will be marked either 180A
or 220A.
This
is the third revision of this cable/harness by Mercedes. Both of the
previous units have been discontinued, and should no longer be
installed. This cable is the most current revision.906 440 96 37 and 906 440 84 55, are both obsolete
If you have had continuing sluggish starts and other electrical problems and you are certain that you have a strong alternator, generating an output of 14V, you may want to look closely at your positive battery cable. This is often a common area of electrical trouble, especially for internal corrosion.
ONLY FOR MODELS WITH 180 AMP ALTERNATOR- DO NOT TRY TO USE THIS ON A 220 AMP ALTERNATOR, IT WON'T WORK
If in doubt, look at the back of the black
plastic back cover on your alternator. It will be marked either 180A
or 220A.
If you have had continuing sluggish starts and other electrical problems and you are certain that you have a strong alternator, generating an output of 14V, you may want to look closely at your positive battery cable/harness, especially for internal corrosion on the copper braiding.
This can be a common occurrence in older cables.
This is often a common area of electrical trouble and is commonly referred to as the infamous "Y cable"
This is the fourth revision of this cable by Mercedes. All three of the previous units have been discontinued and should no longer be installed.
This cable is the most current revision. 906 440 14 09, 906 440 35 38 and 906 440 81 55, are all obsolete.
Alternator voltage regulator and cut-out. Located under black plastic rear cover of alternator. Fits ONLY Valeo alternator, NOT for Bosch. Fits 180 amp models only.
The
220 Amp alternators are used on those models with a secondary A/C
compressor (Roof-mounted A/C units). If in doubt, look at the black
plastic backing plate on the alternator. It will be marked either 180A
or 220A.
Alternator voltage regulator and cut-out. Located under black plastic rear cover of alternator. Fits ONLY Valeo alternator, NOT for Bosch. ONLY FOR 220 AMP ALTERNATOR
The 220 Amp alternators are used on those models with a secondary A/C compressor (Roof-mounted A/C units). If in doubt, look at the black plastic backing plate on the alternator. It will be marked either 180 or 220.
