sbc water-crank pulley clearance? am i missing something?
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    Rods 'n' Sods Junkie Pittaway's Avatar
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    sbc water-crank pulley clearance? am i missing something?

    hi all,

    come to fit up the pulleys on my sbc, and the pulleys are touching. only slightly but still binding. i know they are only aftermarket chrome items, is it just bad tolerances on the manufacturing?

    bit confused here.




    any help be greatly appreciated

    thanks

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    Official RnS Addict timbo56's Avatar
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    I've got similar pulleys that aren't plated and can just about slide a thin bit of card between the two although my top pulley does just about touch the heater pipe inlet on the pump

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    Official RnS Addict WB54's Avatar
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    maybe a mismatched pair but mine are certainly close on the inner groove

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    Official RnS Addict heavychevy's Avatar
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    You could try remounting the pump but hold it as high as you can when tightening the bolts. The holes are a bit bigger than the bolts.

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    Official RnS Addict mygasser's Avatar
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    Quote Originally Posted by heavychevy View Post
    You could try remounting the pump but hold it as high as you can when tightening the bolts. The holes are a bit bigger than the bolts.
    that'll fix it, almost certainly the weight of the pump slid it down as low as it would go on the bolts while being fitted
    need a job done on your project? i may be able to help.

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    Rods 'n' Sods Junkie Pittaway's Avatar
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    i tried moving the water pump but to no avail, i think i have mis- matched pulleys. the water pump pulley is 7.1" but they do 6.8" that should sort the problem

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    Official RnS Addict WB54's Avatar
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    Quote Originally Posted by Pittaway View Post
    i tried moving the water pump but to no avail, i think i have mis- matched pulleys. the water pump pulley is 7.1" but they do 6.8" that should sort the problem
    or the other solution is to put a washer under each main bearing cap to space the crank from the water pump...

  10. #8
    Official RnS Addict mygasser's Avatar
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    Quote Originally Posted by WB54 View Post
    or the other solution is to put a washer under each main bearing cap to space the crank from the water pump...
    or elongate the the bolt holes in the pump a knats (that's a technical term) to give clearance.
    be aware also the smaller pulley will spin the pump faster.
    Neil.
    need a job done on your project? i may be able to help.

  11. #9
    Official RnS Addict timbo56's Avatar
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    Quote Originally Posted by WB54 View Post
    or the other solution is to put a washer under each main bearing cap to space the crank from the water pump...
    Careful what you say, there are people stupid enough to do that, it's on the internet so it must be right

  12. #10
    Rods 'n' Sods Junkie Pittaway's Avatar
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    turns out ive got a mis- matched set! been so long building this car i cannot remember where they came from, thanks for all the help though!

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