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Old 07 June 2014, 18:53   #11
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Originally Posted by Mollers View Post
Tell the twat that if he doesn't shape up, he'll be dropped next season. ;-)
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Old 08 June 2014, 06:23   #12
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Thanks everyone

I took it down to whistable yesterday, thought I'd see if it goes after the new fuel pump and would try the prop another day.

It didn't go again !

Same oldchap on the beach lent a hand, thermostat is shot, the old chap said you can run them without ?

He told me that I need a new impeller and if I bring the outboard to him next week he'll show me how to fit it, give it a check over and remove the prop (he said best way is to lift the outboard by the prop and then hit the loosened nut and it's own weight will pull it off). He also told me that it looks like it low hours but just not been serviced, at all. Guess it shouldn't surprise me that the ebayer I bought it off had lied !
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Old 08 June 2014, 13:24   #13
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tips for a stubborn prop

Do not run it without a stat for any length of time, a cold engine dramatically increases wear.

Did it run at all? How does the old fella know that you need an impeller?
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Old 09 June 2014, 02:24   #14
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Do not run it without a stat for any length of time, a cold engine dramatically increases wear.

Did it run at all? How does the old fella know that you need an impeller?
When I started it I had no tell tale, though had one earlier that day after fitting the new fuel pump and running it in a bucket. He took the thermastat out which is pretty gunked up but opens if you put it in some warm water. Poured some water in the hole and nothing came out lower down the leg. He then poured some coke down the hole and after a while it came out down the leg, he said that it was blocked up, made sense. We took it back to the water but still no tell tale. He said that it had probably done itself in as was blocked.

After having tested the thermastat in warm water, I wondered whether to clean that up by soaking in cola too ?
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Old 09 June 2014, 03:20   #15
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tips for a stubborn prop

As a rule when I get an engine of unknown history I usually replace water pump, fuel pump, filters, thermostat and plugs so I know what I'm playing with.

I wouldn't try and clean/bodge stuff, replace with new. For the few quid it costs its not worth the hassle IMO.

What engine is it?

I know some of the mariners and mercurys can be 10sec or so before they produce a telltale.
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Old 09 June 2014, 04:54   #16
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Tell tail probably got blocked up by the crap floating around the water ways after fiddling with the stat.
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Old 09 June 2014, 05:36   #17
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it's a Yamaha 25D
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Old 09 June 2014, 05:59   #18
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Yam should pump water all the time.

Dont mess about with Coke (or vinegar), get some Rydlyme to flush the engine and clean the thermostat. As mentioned above you can run the motor without the stat but its not great for the performance especially in our cooler temperatures. Some engines dont work well with the stat removed, it can mess up the water flow and reduce cooling (the Yamaha 6/8c is like this).

Strimmer line is great for working your way round the cooling system. Great advice about basic service items above, I would also change the gearbox oil and gaskets at the same time.

Rydlyme Marine Descaler
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Old 12 June 2014, 19:00   #19
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Bought a new stat, haven't managed to find the rydlym yet.

Lost heart with it a bit as just discovered baffles are shot in boat and reading here are not really repairable

Good old ebay !

Notice the guy I bought it off often sells boat bits, his name is rfadave, people should avoid him !
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Old 12 June 2014, 19:28   #20
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Sorry to hear about your troubles. As you are starting to realise, PVC boats have a finite life. Dont worry too much about the baffles, as long as the boat stays inflated its not the end of the world. The average life of a PVC boat seems to be between 10 and 15 years and its usually the failing glue that kills them off, yours has done quite a lot longer than average.

Rydlyme available through Seamark Nunn Rydlyme Marine Biodegradable Marine Descaler 1 Litre
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