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  1. #1
    Platinum Member Platinum Member
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    B&M 250 lower pulley installation

    I need some experienced people with blower pulley installation.

    I am in installation of the lower blower pulley and v grove blet pulley and i am in questioning on the center 1/2'' bolt that bolt into crankshaft to hol the balancer. That i need to have a longer 1/2'' x 4 1/2'' long center bolt to hold all the pulley, spacer and balancer together?
    Or just bolt the pulley with the 3 x 3/8'' bolt into the balancer and balancer bolt separate into crank ?

  2. #2
    RgrGoog Platinum Member rgrgoog's Avatar
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    1997 29 Fountain Fever, Twin Supercharged 509s
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    I am no expert but this attachment may help you.
    1997 29 Fountain Fever with twin Supercharged 509s

  3. #3
    Registered 737jetmech's Avatar
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    Install the longer 1/2 " ( grade 8 ) bolt . With the correct spacer it is not possible to do it any other way .

  4. #4
    Platinum Member Platinum Member
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    Quote Originally Posted by 737jetmech View Post
    Install the longer 1/2 " ( grade 8 ) bolt . With the correct spacer it is not possible to do it any other way .
    Thanks

  5. #5
    VIP Member VIP Member MILD THUNDER's Avatar
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    Mine used a standard balancer bolt, with the large washer. Then, the accesory pulley goes on, spacer, drive pulley, then install the 3 long 3/8" bolts that hold all that to the balancer. In other words, the balancer goes on first and is torqued down. Then everything else gets bolted on

  6. #6
    Platinum Member Platinum Member
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    Quote Originally Posted by MILD THUNDER View Post
    Mine used a standard balancer bolt, with the large washer. Then, the accesory pulley goes on, spacer, drive pulley, then install the 3 long 3/8" bolts that hold all that to the balancer. In other words, the balancer goes on first and is torqued down. Then everything else gets bolted on
    Ok, the 3 long 3/8 (grade 8) bolt is enought strong to hold all the pulley on the balancer?

  7. #7
    VIP Member VIP Member MILD THUNDER's Avatar
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    Quote Originally Posted by supermx96 View Post
    Ok, the 3 long 3/8 (grade 8) bolt is enought strong to hold all the pulley on the balancer?
    Worked for me.

  8. #8
    Registered
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    Quote Originally Posted by MILD THUNDER View Post
    Worked for me.
    Above post are correct. I have a 250 blower and ended up coming across a 420 lower pulley set up that bolts up a little different. I liked the 420 lower pulley mounting style more than the 250 style so that's why I went the direction I did. The 420 lower pulley is a tad bit smaller than the 250 so I will loose a little boost from it but it shouldn't be a whole lot.


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