2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

s5 motor and s4 waterpump questions

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Old Nov 6, 2003 | 01:52 PM
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s5 motor and s4 waterpump questions

I have a 90 GXL that needs a new water pump. Will the s4 water pump fit on the s5 motor without any modification? I would believe it would but am not 100%. Please let me know.

Last edited by knight1976; Nov 6, 2003 at 01:55 PM.
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Old Nov 6, 2003 | 02:08 PM
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Re: s5 motor and s4 waterpump questions

Originally posted by knight1976
I have a 90 GXL that needs a new water pump. Will the s4 water pump fit on the s5 motor without any modification? I would believe it would but am not 100%. Please let me know.
The S4 water pump will only work if you use the S4 water pump housing.

I don't know how well the S4 pump handles the extra 1000 rpm up top, though.
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Old Nov 6, 2003 | 02:16 PM
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hmmm SO id have to change to a s4 waterpump housing too huh? Well crap. Anyone got a s5 waterpump for sale ?
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Old Nov 6, 2003 | 02:31 PM
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Originally posted by knight1976
hmmm SO id have to change to a s4 waterpump housing too huh? Well crap. Anyone got a s5 waterpump for sale ?
Yeah, the pump design is slightly different. S5 pump has an extra bolt on the bottom, so you can't swap between series without the housing. The studs are identical, though.
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