91 4 cyl water pump - LotusTalk - The Lotus Cars Community
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post #1 of 3 (permalink) Old 04-23-2010, 08:55 AM Thread Starter
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91 4 cyl water pump

We have a 1991 Esprit 4 cyl in the shop now needed water pump replacement. Not finding Lotus in our labor guide. Any idea how much time to charge for this job?
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post #2 of 3 (permalink) Old 04-23-2010, 06:14 PM
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First time working on an Esprit but experienced mechanic, I'd guess 8 hours

1995 S4s
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post #3 of 3 (permalink) Old 04-24-2010, 09:06 AM
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The pump can be rebuilt (seals and bearing replaced in same housing with a press and an oven). A pump replacement is ~$600 with a core.

Removal and replacement is not too bad from mostly below. Must remove vacuum pump for better access. Hardest part will be putting it back on the block without messing up the sealant. Draining, refilling, and bleeding air from the cooling system is the biggest time chunk.

It definitely takes less time the second time... After you develop the tools and techniques.

Have a look here Picasa Web Albums - lotusse - Lotus water pump

1)drain coolant
2)remove triangle brace
2.5)remove AUX belts (ALT, AC, WP+vacc)
3) remove vacuum pump, need hex driver to reach one bolt
4)remove Oil pump pulley (requires loosening timing belt, so I would lock it in place to preserve timing on the intake and exhaust cam. Oil pulley timing does not matter.)
5)remove 4 hose connections to water pump
6)unbolt and remove water pump
replace/rebuild waterpump
7)reseal WP with anerobic sealant or a gasket and hylomar
8) attach hoses, pretty difficult actually
9)put oil pump pulley back on
10) tension timing belt (use correct Burroughs gauge, Clavis acoustic gauge, Gates Krikit KR1, or laptop+Tune!it+microphone) each with their own procedure.
11) replace vacuum pump
12)replace AUX belts
13)replace triangle brace
14)refill coolant
15)bleed air from coolant

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