Just some info for you guys...DO NOT put a mechanical clutch fan with a spacer on the GM Serpentine belt system. Just snapped the pulley and fan right off my water pump.
Warning!
- Thread starter 84cutspreme
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Are you sure you don't have a problem with your fan or clutch? Many GM serp systems use a mechanical fan, usually if you destroy a water pump it is something out of balance, or a bad water pump. A buddy of mine has a "604" crate motor in his 81' Monte with a GM performance serp system, he swapped out the water pump for a Edelbrock pump and changed the balancer on the motor and he hasn't had any issues and he has been running it for a couple years now
I assumed it was either the water pump or the 1.25" spacer. These serpentine pulley's seem much better balanced than my previous v-belt setup. Here are some pics of the damage
Cadillac ran a fan and fan clutch on the Brougham with a 5.7 TBI and a serp drive . If I remember correctly it had a Fan blade and fan clutch that was set up to run the same direction as the reverse rotation water pump.
Yup, water pump, thermal clutch and fan are all counter clockwise rotation. I think it was either bearing failure, balance issue or spacer threw something off...unfortunately I took out my radiator and put a little dent in my hood and destroyed my V8 fan shroud
Ok next question was the alignment hole in your spacer a tight fit on the little "t*tty" on the pump? 5/8" and3/4" are both pump shaft sizes, most spacers have a 3/4" hole in them with a bushing to step them down to 5/8", I have seen many circle track guys make that mistake
http://www.summitracing.com/parts/der-31515/overview/ This is the fan spacer and it came with a bushing for water pump pilot. I also machined the spacer down from 1.500" to 1.250" to get fan to sit in shroud nice.
This is the water pump that came with serpentine kit
http://www.summitracing.com/parts/nal-19201601/overview/
This is the water pump that came with serpentine kit
http://www.summitracing.com/parts/nal-19201601/overview/
Ok that should have worked fine, I guess it's something with the clutch or the blade itself, or a faulty water pump.
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