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Old 21 June 2013, 18:10   #21
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It is possible to fit the impellor up side down....(Don't ask how I know) all looks fine, but the key doesn't engage so the fit spins it until you load it up then it slips. ( of to watch fight club now..but I don't like to talk about it)
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Old 21 June 2013, 18:11   #22
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Quote:
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( of to watch fight club now..but I don't like to talk about it)

Come on Peter, tell us where the venue is .....
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Old 21 June 2013, 18:51   #23
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But why would it go from a good jet on start up, to water getting very hot and stopping altogether.
Blown powerhead to leg gasket at a guess.
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Old 21 June 2013, 19:14   #24
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Just wondering if its anything to do with the rubber seal / grommet on the riser pipe where it push fits to the power head .
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Old 21 June 2013, 19:23   #25
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Just wondering if its anything to do with the rubber seal / grommet on the riser pipe where it push fits to the power head .
Good point. Check all water grommets to see it's condition, could be rotten, dried out, producing water leak somewhere on the water path, impeller housing, water pipe, block.

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Old 21 June 2013, 19:24   #26
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Just a thought but have you tried connecting a hosepipe direct to the pipe that runs into the engine from the impellor and running it to see if it circulates ok ?
If this is going to damage anything I'd appreciate somebody saying so ??
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Old 21 June 2013, 19:30   #27
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Just a thought but have you tried connecting a hosepipe direct to the pipe that runs into the engine from the impellor and running it to see if it circulates ok ?
If this is going to damage anything I'd appreciate somebody saying so ??
Not that will damage anything, but salt formations, crusts that blocks/lessens best water circulation to disipate heat inside engine won't be removed, will need to be removed mechanically by hand. It's like having artereosclorosis...

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Old 22 June 2013, 03:51   #28
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If in doubt & you have a decent cordless drill you could always eliminate the waterpump & impeller after assembly by immersing it in a tub of water & rotating the drive shaft to see what the water pressures like or how good it's coming out of the pipe before you join it back to the engine .
(You don't need to rotate the shaft at a really high speed )

If the pump housing or base is badly scored or its perhaps been fitted with a thicker gasket you can loose water pressure from the the impeller top & bottom sealing surfaces & not just at the blade tips
If you use your engine on a shallow sandy beach or in shallow gritty mud a lot you can see the difference in the waterpump scoring to an engine that spends its working life in deep water .
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Old 22 June 2013, 04:42   #29
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Originally Posted by earthdog1970 View Post
no the bottom one is the old one, and yes I think the new one has a brass lining.
Your asking for trouble ahead fitting after market impeller with brass inset. Phone Graham and ask for part number 6h4-44352-00
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Old 24 June 2013, 14:30   #30
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Well finely got there in the end, put the new impeller in and thermostat and its now putting out a good strong jet,and sticking at the right temperature, so what ever it was it now seems to be OK.
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