1977 Evinrude 140 Impeller Key - Different Lower Unit??

[Jay Williamson]

Hi all I have a 1977 Evinrude 140 and have ordered two different impeller / water pump repair kits. The first one I ordered from iBoats.com and after I got my LU dropped (darn shift linkage, haha) I discovered that my driveshaft uses a different impeller key than what was listed on iBoats' parts lookup.

Oh well.

In addition to needing an impeller, I realized that once I had everything apart I really needed the whole kit with gaskets and a housing, etc.

I hopped on marineengine.com and used their parts lookup. I typed in the model # found on the engine's tag and it suggested a kit from Sierra, part #18-3393.

I thought that using the motor's serial number would be the no-fail way to get the right part. I was wrong. This kit has the same style of impeller and key that the first kit had.

Here is my driveshaft.

Here is my original impeller.

Here is the style that I was sent twice.

Notice that my impeller uses the plastic wedge type keeper and both of the new impellers use a half round slotted style.

Is it possible that my lower unit is from a pre-1977 motor?

I looked up the 1976 motors and there is no 140hp listed.

I'm stumped!

Any help will be appreciated!

 

[Jay Williamson]

Awesome! Thank you so much for the help. I'll see about returning the parts I've got and order the parts for a '79 or newer LU.

Is it common for a motor tagged as a 1977 to have a different lower unit? based on looks I'd say that it matches the rest of the motor.

 

[Jay Williamson]

The tag on the motor reads:
model no 140743s
serial no j0003258

Does this look like the right kit? I got the part # from Evinrude's web site by choosing a 1979 140hp motor.

https://www.marineengine.com/newparts/part_details.php?pnum=OMC5001594&ptype=&Engine=&Model=

http://shop2.evinrude.com/Index.aspx?s1=kvms1k6gceelk4afkvqerultu5&catalog_id=0&siteid=1

Thanks again for the help and I'll be sure to use your tips when I am able to reinstall the correct parts.

 

[Jay Williamson]

Ok I'll look for the part # on my impeller housing today. Thank you!

 

[racerone]

There is a newer lower unit / driveshaft installed on the motor.--------Happens all the time , just order parts for 79 and up to about 92

 

[Jay Williamson]

Ok thanks a lot, both of you have been so helpful!

 

[Jay Williamson]

Third time was indeed a charm! The water pump kit for 1979-up was the correct part. My brother and I got it reassembled and plan to take the boat out tomorrow for a trial.

Thanks for all of the help guys!