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#1
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2003 4.4 water cooled alternator belt IMPORTANT to know.
(TL;dr belt # 7PK644 NOT 7PK1635) I went down a bit of a rabbit hole trying to get the correct serpentine belt when I had to replace my alternator. I have seen postings here and other sites where others also encountered conflicting information about the correct part numbers. In my case, I originally ordered the alternator and new belt from a vendor on Amazon. I checked several and most of them only had one belt listed for this application. I spent about an hour trying to get the belt to fit. It was so close that I believed that I was just not doing it right. More research led me to the others that had the same problem. It turned out this was not the correct part for my situation - the difference is only a few millimeters, but enough to prevent the belt from slipping on. The correct belt took about 2 minutes to install. 7PK1635 was the size listed on the various Amazon vendors. ![]() The CORRECT part was 7K644 (or some listings are 7PK644): ![]() Hope this posting might help others avoid a frustrating experience. |
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#2
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I think the 4.4 and 4.6 alternators may have different sized pulleys?
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02 Imola on Black Dinan S2 4.6iS 00 RoyalRot on Sand/Black 740i Short Sport |
#3
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The 4.6 balancer is slightly under sized (under-drive) when compared to the 4.4 balancer. RealOEM has the correct part numbers…or did last time I looked.
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Current Original owner 2002 E53 X5 4.4i to 4.6i swap 2025 G06 X5 50e Former 1972 Audi Fox 1986 Saab 900S 1996 BMW Z3 1998 BMW E36 M3 Sedan 2004 BMW E46 M3 2006 Audi A3 Quatro 1993 Mopar 318 Jeep Grand Cherokee 2015 V6 Jeep Grand Cherokee |
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alternator, belt, length, serpentine, size |
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