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Old 26 September 2008, 18:31   #11
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think i would try a new impeller at least then water pump kit with a new bottom plate ,.can you see if the bottom plate or upper pump case is badly scored or worn .as i said in an earlier post its not just the impellers blade tips that wear its the top and bottom that seal .
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Old 26 September 2008, 19:26   #12
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Try and hook up a water supply to the pickup tube-if there's no blockage you'll get a pee stream. Just make sure you keep the engine upright all the time the hose is connected and you'll be able to start it if you want-but you'll get a stream anyway even if it's not running.

Have you still got the sealing grommet in the impeller housing (if it has one) and if so is it worn enough to lower water pressure dramatically??


Assuming it's OK, go buy all the parts M Chappelow lists. It's a false economy doing anything else on outboards
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Old 30 September 2008, 09:04   #13
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hi there i hooked a water supply to the engine today and it seems to be fine with a strong tell-tale. i also left the engine running fo a while and it seemed fine with no overheating. i put it back together and run it up again. i filled the bucke up with water just below the grommet where u relese the 10mm bolt on the gear shift rod. if i leave the gromet out (lots of noise haha) the engine will pump water not a great deal but it will come out the tell-tale. if i put the grommet back in it just dribbles and seems to be mainly exhaust gasses out of it. im going to track down a new impellor and gasket and housing as thats got to be what it is even though i cant work out why the grommet would make any diference.
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Old 30 September 2008, 14:38   #14
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How deep do you have the engine in the bucket?
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Old 30 September 2008, 17:02   #15
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ive definatly got it deep enough for it to be picking up water. i think its got to be a seal or gasket on the impellor.
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Old 30 September 2008, 17:07   #16
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[ gasket and housing as thats got to be what it is even though i cant work out why the grommet would make any diference. [/QUOTE]

the grommet makes the seal for the water delivery to the engine from the pump if its split or perrished the water wont go up the pipe or the exhaust pressure will try blow the water back down the pump, and if theres any wear on the pump or impeller it makes it worse.
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Old 01 October 2008, 19:32   #17
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Quote:
Originally Posted by dirtrider212002 View Post
hi there i have stripped my yamaha 8b down and cleaned the impellor and all the depisits around it and just genrally spruced the area up as it was filthy. before i did this it pumped water fine now it is pumping nothing the odd drip here and there has anyone got any idea why? the tube that sends to the engine is located properly. thanks for any help
How old is your yammie ? Was it heavyly used ? Is the head been repaired before ?
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