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#1
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Spare's post is telling you be agrees with phat's post...
I do too... Replace the impeller and housing before we go any further. IF you still have a problem then we'll dig in. 
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#2
07-28-2015, 02:41 PM
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Quote:
And as to the rest of my post. Is it okay to blow compressed air backwards thru the telltale hose into the engine just to make sure everything's clear?. There's no t-stat or poppet valve in these engines, so really I don't think there's anything to impede the airflow (except a blockage if there is one). For that matter, is it okay to hook a garden hose up to the telltale hose and run low pressure water backwards thru the engine?
__________________
1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer 1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer 1996 V21 w/1993 200HP Mercury on a Shoreline Trailer All towed by a 5.7L Hemi Durango. If God didn't have a purpose for us we wouldn't be here, so Live simply, Love generously, Care deeply, Speak kindly. (Leave the rest to God)  Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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#3
07-28-2015, 03:25 PM
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Pull the plugs out of the engine, hook a water hose up to the tube going up to the engine, and run water through it. See if wtaer gets into the cylinders, this wil ltell you right away if you have a corrosion or gasket issue. One of the 1st things I always do when a pump is in question is to hook a water hose up to it with the lower off, and run it that way.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR 2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD  AND THE PINK JEEP!!!! R.I.P. http://www.wellcraftv20.com/communit...ad.php?t=11664 
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#4
07-28-2015, 04:21 PM
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also noticed in the parts breakdown there are 2 different impellors & housing. you said impellor looks new, po might have tried to solve overheat issue with new impellor and got wrong size.
these are the prices i'm finding 89981 impellor 12.91 89980 impellor 20.34 70941a housing 59.19 92970a housing 31.35 these were on boats.net Last edited by phatdaddy; 07-28-2015 at 04:29 PM.
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#5
07-29-2015, 04:20 PM
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Phat, looks like you win the overheat derby. I used my micrometer on the driveshaft and then my veneer calipers on the ID of the old Impeller. there's almost .020 slop. Seems Mercury used 2 different driveshafts on these engines and as you correctly called it that results in 2 different impellers and housings.
The PO obviously installed the wrong one. It's just enough that the pumping action just isn't there.There shouldn't be any slop between the shaft & impeller. There are two impellers that can fit that outboard. The 47-89981 has a .456 ID the 47-89980 has a .438 ID. The .456 is what I have, the .438 is what should be there.
__________________
1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer 1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer 1996 V21 w/1993 200HP Mercury on a Shoreline Trailer All towed by a 5.7L Hemi Durango. If God didn't have a purpose for us we wouldn't be here, so Live simply, Love generously, Care deeply, Speak kindly. (Leave the rest to God) Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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#7
07-30-2015, 09:03 AM
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Something to keep in mind too is the different sized water tubes with the kits for different length shafts. The short one will always fit.
__________________
1985 Wellcraft V-20, Evinrude ETEC 150: SOLD 1979 Marine Trader 44, twin Ford Lehman 120s 2006 Panga 14, Tohatsu 20
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#8
08-02-2015, 08:24 PM
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These guys are amazing
__________________
love to fish
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