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Old 30 August 2015, 18:04   #11
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My Mercury doesn't put water out of the tell-tale with just a hosepipe connected to the muffs unless the engine's running. Turn the engine off & the telltale stops.
Check the stat.
Yeh - but your impeller would stop the flow as its not turning. But if the impeller is damaged water can flow past, or if the key is damaged it can spin on its spindle.
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Old 30 August 2015, 18:54   #12
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The impeller would act as a plug.
If the key is damaged/missing the pump drive shaft will be turned by the engine but not pump water as the impeller isn't turning & blocking the water supply so I doubt if you'd get any water from the telltale.
If there was no impeller in place or a number of its blades are badly damaged or broken then I expect it could be possible for water to reach the top of the engine on muffs when not running.

Be interesting to see what would happen with the OPs if run in a bucket. Or what he finds when he drops the gearbox to check the impeller & key.
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Old 31 August 2015, 03:58   #13
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If the key is missing /broke ... Why would putting water in the intake at pressure (I.e muffs) not just spin the impeller on the shaft and allow water past?
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Old 31 August 2015, 04:13   #14
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Dont know why but I have had 3x F30/40 keys shear this year I have never seen a key snap for years. They seem to wedge in at idle but lose drive anything over 1500 rpm.
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Old 31 August 2015, 04:17   #15
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Going on my own engine & its impeller I'd be very surprised if domestic water pressure could turn the impeller. The blades are very curved when in position.
Plus the muff cups are flexible to allow them to conform as well as possible to the water intake & consequently don't form a waterproof seal in the way that a screw in adapter would, water can escape round the edges. I use the muffs for flushing only as per the instructions in the manual. If I want to run for extended periods or at higher revs then I use a cut-in-half plastic 55 gallon drum.
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Old 31 August 2015, 04:18   #16
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Dont know why but I have had 3x F30/40 keys shear this year I have never seen a key snap for years. They seem to wedge in at idle but lose drive anything over 1500 rpm.
Bad batch?
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Old 31 August 2015, 06:26   #17
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Bad batch?
All on pre fuel injection
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Old 31 August 2015, 07:55   #18
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The impeller is larger than the pump housing that's why you have to rotate in the direction of the shaft so the vanes lean back hence the resistance caused will prevent tap pressure spinning the impeller unless it's completely shot then the bits of rubber go up the waterways had it happen to one at work resulting in overheating if the engine has stood a while with an old impeller it could have work hardened and broke up best to strip the leg off have a look. Look on you-tube for D-Rays shop impeller service.
Cheers.
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Old 31 August 2015, 16:32   #19
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Pictures tell a thousand words as the saying goes....

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Mechanic said he checked the thermostat and it was fine, don't know wtf he checked but it certainly wasn't fine!
Don't have a kicker engine yet but because the engine was freshly serviced by my local Yamaha dealer and had a new timing belt, I felt I'd be safe enough to take the kids for a quick spin, after it overheated it took me over an hour rowing to get back, fairly pissed off now... :-(
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Old 31 August 2015, 17:39   #20
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Send him the picture asking what he actually checked
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