Peter Eichler wrote:

|| Dear all,
||
|| I have a Mercury 4 hp 2-stroke, assumed to be from 1990, which has a
|| problem since I used it for a longer trip on my 17 ft sailboat.
|| After having run for a couple of hours the tell tale flow became
|| quite weak, the engine still ran but the temperature seemed to
|| become somewhat higher than normally when I use it just to get out
|| or in the harbour. I tried to suck on the tell tale hose and there
|| was a high resistance to get some water through it.
||
|| My assumption is that there is an issue with the impeller. Is there
|| anybody experienced enough to describe the impeller replacement
|| procedure or even can provide a kind of maintenance or repair manual?
||
|| Any help is highly appreciated.
||
|| Regards,
||
|| Peter

Are you sure it isn't just the tell-tale that is blocked? Water can be
flowing merrily around the system, but the tell-tale can be blocked and show
no flow at all. Seems quite a common occurrence. Poke around it with a bit
of wire before you dimantle anything (i.e. try the zero-cost option first).
I believe changing the impeller is pretty straightforward, though I have
never done it myself. Mercury recommend a new impeller every season anyway.

HTH


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Rich
V8 90 under reconstruction
RR 4.6HSE