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Changing 170 outdrive impeller
It's been too long. Can you guys give me the short form tutorial on changing the impeller in my 1985 Mercruiser 170 outdrive. I'll probably recognize most of what I need to do when I get in there but I recall that the throttle lever needed to be in a particular position (I think it was forward) and I need to drain the oil before taking it apart??
Comments appreciated. Thanks
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 Scott, Portland, OR '85 V-20 I/O, Merc 170
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#2
09-02-2017, 08:38 PM
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surprised nobody helped you
I am surprised none chimed in!? Just go to you tube and do a search or search on this site... best bet for anything you need
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1986 V-20 2001 Mercruiser 4.3L 
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#3
09-02-2017, 10:14 PM
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Thanks Tunnaman - when nobody posted that's what I did. I don't know why I didn't think of that, I've researched a lot of other stuff that way.
Sometimes you have to go through a few to get a good one but they're there.
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Scott, Portland, OR '85 V-20 I/O, Merc 170
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#4
09-03-2017, 02:20 PM
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I didn't chime in because I don't have an outdrive. Most of the guys here run outboards also. If you had asked about an outboard that would have been a different story I'm sure.. Glad you found your answer.
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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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#5
09-03-2017, 05:19 PM
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leave it in forward gear, the shift hardware all aligns in forward gear. Drop the lower unit,dont forget the bolt under the trim tab. R%R the impeller. Prop turn counter clock wise viewed from the rear to keep it n fwd gear. Spin the prop to get the splines aligned, Bolt back up, fill with gear lube from the bottom
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#6
09-03-2017, 08:23 PM
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... There's the Chime!!! Lol
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1986 V-20 2001 Mercruiser 4.3L
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#7
09-03-2017, 08:34 PM
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It took so long to get a rebuild kit that I'm not sure about some of the stuff and the kit has a ton of extra parts (must be for several versions of the pump).
Can anyone email me a blow-up diagram of the Alpha 1 Gen 1 with the water pump? All I'm finding online is Gen 2. Thanks Spare - I recall the keep it in forward gear part now.
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Scott, Portland, OR '85 V-20 I/O, Merc 170
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#8
09-04-2017, 12:08 PM
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Good Site
http://www.marineengine.com/boat-for...erndrive-Forum
is another great informational site like this one. There a few guys that belong here on Wellcraftv20 belong on the marine Engine forum. Just find the forum with your engine and search a subject.... lot of info!!! lower unit upper video http://www.sterndrive.info/alpha-one...ing_lower.html Lower unit Diagram http://www.sterndrive.info/alpha-one/id305.html But I am sure somebody on here can send you a diagram.. also to be a great idea to buy a repair book
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1986 V-20 2001 Mercruiser 4.3L
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#10
09-05-2017, 08:07 PM
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Thanks again guys:
Tunaman - the diagram kept me on the right track reassembling the pump. Spare - I'm glad you reminded me about turning the prop counterclockwise to line up the spline and hold it in forward gear - went together very smoothly. Got it back together and ran it on the earmuffs for a half an hour and it purred like a kitten and held about 140 degrees on the temp gauge. This is the one that was running for 20 minutes and losing RPM until it died. I can't wait to get it on the water for a real shake-down but it looks like it's fixed. 
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Scott, Portland, OR '85 V-20 I/O, Merc 170
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