Changing 170 outdrive impeller

scook

scook

God
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
 
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
 
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.
 
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.
 
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
 
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.
 
Good Site

http://www.marineengine.com/boat-forum/forumdisplay.php?28-Mercruiser-Sterndrive-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/parts_drawing_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
 
Thanks Tunna - that should give me what I need. I appreciate the help (that site looks like a good resource).
 
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. :sun:
 
I have to replace mine soon , never done it before ( always paid somebody ) so any words of advice is appreciated..keep it in drive seems to be key for the shifing linkage?
 
Tunnaman,

Try this link (it should be a youtube video "Mercruiser Impeller Replacement" posted by barrysmarine). It's the best one I found.

https://www.youtube.com/watch?v=KfatYFUVy24[/url]

I found making the jig that Barry suggested made the job a LOT easier - it not only held the lower unit conveniently, it gave me a small flat work surface to keep the tools handy and to put parts on as i took the old pump apart. I couldn't figure out how to insert a picture of it - if you're interested in making one, PM me and I'll email you photos and a sketch of how I made it.

Add Spareparts' instruction about starting and keeping the system in forward gear and when remounting the lower unit, turning the prop counterclockwise to keep it in froward gear and to turn the spline of the drive shaft until it aligns and slides up into the upper unit. To be sure the lower unit is in forward gear when you're ready to mount the lower unit back on the boat, turn the prop counterclockwise slowly and grab the little splined shaft sticking up at the front of the lower unit and turn it clockwise with some pliers (be a little gentle - you don't want to screw up the splines) until you see the driveshaft turning.

Remember to get the two nuts on the sides threaded on before you get the lower unit all the way up tight to the upper unit (there's not enough clearance to get them on with it up all the way).

If I can be of any other help, let me know.
 
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