water pump pulley - loose belt?

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Seight-V8
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water pump pulley - loose belt?

Post by Seight-V8 » Thu Oct 17, 2019 6:57 pm

Hello all,

Should I be able to move the water pump pulley by hand on my GEMS efi engine??

Thinking the belt isn't tight enough, but as I don't have a belt tensioner on the system, its hard to know what is tight enough.

Have some cooling issues, and I'm not sure the pump is giving 100% if the belt is slipping.

I have heard of people knurling the flat area of the water pulley for extra grip?.....anyone got or done this to good effect?

Its also a new poly 7-rib belt, and I've already tighten it a few times.....



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Re: water pump pulley - loose belt?

Post by SuperV8 » Fri Oct 18, 2019 12:17 pm

No - you shouldn't be able to turn the coolant pump pulley by hand and the belt slip -
If you turn the pulley it should turn the engine over.

Tom.
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SimpleSimon
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Re: water pump pulley - loose belt?

Post by SimpleSimon » Sun Nov 24, 2019 5:24 pm

If the belt is incorrectly tensioned (slack) the alternator will protest way before the water pump i.e screaming its head off especially when a load is applied to the battery post starting or headlights heater on etc
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Re: water pump pulley - loose belt?

Post by SuperV8 » Mon Nov 25, 2019 7:52 am

Belt wrap around the pulley is also very important - do you have enough wrap?

Post a photo of your belt routing - I've seen quite a few belt routes with the water pump barely deflecting the belt and this is not enough.

Tom.
Dax Rush 4.6 supercharged V8 MSII

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