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Thread: Serpentine Belts, Long, & short. For 300tdi.

  1. 3rd January 2007, 08:17 PM #1
    sumo
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    Serpentine Belts, Long, & short. For 300tdi.

    Hi

    Have been told theirs a long & a short belt for the 300s, whats the difference? and what goes on what? Mine has about as much flex as a lenght of R.S.J. Sooo hard on that little waterpump, with that bloody big pulley hanging off the end.


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  2. 3rd January 2007, 08:24 PM #2
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    justinc
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    The OE belts available for the 300 Tdi are; 7PK1580 and 7PK1595. These are the factory original lengths. (1580mm, 1595mm) Part numbers are ERR5911, and ERR3287.

    It is also possible that the alternator may have been replaced with a larger or small pulley, so it pays to check the length of whats on there first.
    JC
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  3. 3rd January 2007, 11:00 PM #3
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    langy
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    As Mr JustinC says, its all about the pulley. Early Disco 300Tdi had a MM 100amp alternator with a 60mm dia pulley. Defenders have a 65 amp pulley with a different makeup, and replacement Magnetti Marelli 100amp alternators ( sourced from MM and not thru LR - heaps cheaper) have a 70mm pulley. Alternators from late D1 vehicles can also have 55mm pulleys. So the length of the belt (last 4 numerals - the 7 refers to the number of ribs in the belt) depends on the size of the alternator pulley. As an extra note - most auto stores have stocks of serpentine belts, and as long as you know the right length and number of ribs it'll be fine.
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  4. 4th January 2007, 07:21 AM #4
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    incisor
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    dont forget there are 2 alignment marks on the spring loaded idler that indicate whether the belt is tensioned properly or too long/short.

    they should line up at about 5 to 12 with the back marker being twelve, or so i was told....
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  5. 4th January 2007, 02:54 PM #5
    sumo
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    Just checked those markings out, looks pretty good to the position you mention.

    Thanks for that.

    Sumo
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  6. 4th January 2007, 08:24 PM #6
    Bush65
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    Since the tacho takes it's signal from the altenator, a change to the pulley diam will affect the reading.
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