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-   -   B&M 250 lower pulley installation (https://www.offshoreonly.com/forums/general-q/276947-b-m-250-lower-pulley-installation.html)

supermx96 05-22-2012 12:09 AM

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 ?

rgrgoog 05-22-2012 08:55 AM

I am no expert but this attachment may help you.

737jetmech 05-22-2012 11:36 AM

Install the longer 1/2 " ( grade 8 ) bolt . With the correct spacer it is not possible to do it any other way .

supermx96 05-22-2012 08:18 PM

Quote:

Originally Posted by 737jetmech (Post 3693142)
Install the longer 1/2 " ( grade 8 ) bolt . With the correct spacer it is not possible to do it any other way .

Thanks

MILD THUNDER 05-22-2012 08:24 PM

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

supermx96 05-22-2012 10:24 PM

Quote:

Originally Posted by MILD THUNDER (Post 3693531)
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?

MILD THUNDER 05-22-2012 10:27 PM

Quote:

Originally Posted by supermx96 (Post 3693681)
Ok, the 3 long 3/8 (grade 8) bolt is enought strong to hold all the pulley on the balancer?

Worked for me.

mustangmark 05-24-2012 08:43 PM

Quote:

Originally Posted by MILD THUNDER (Post 3693682)
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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