Johnson 5 1/2 1955

[geary]

Hi Guys   I just acquired this nice little CD-12 Johnson 5 1/2 and decided to tear into it and get it running ! Got the usual stuff done, cleaned the carburetor, new coils and condensers dressed the points and set them !   Did a couple repairs in the cowls (mouse pee damage), now I pulled the powerhead to service the impeller !  When I removed the pump housing, the impeller stuck in it once I got the pin out of the drive shaft and pulled it all the way off I noticed the bore of the impeller was sloppy on the shaft !

The impeller didn’t look in bad shape but it’s definitely wasn’t the correct one for this engine !  It has the 1/2″ bore but the shaft is .429 o.d. In trying to look up the correct impeller but everything I found that said it was for this engine was with the 1/2″ bore !  The serial no. is 1257523 model CD-12 so how do I find the correct impeller ?    Thanks

Gary

[frankr]

Those 5.5 motors used 277187 (now superseded to 434424) nearly forever, at least till the whole pump was changed on the 1970’s.  I’d wager a guess that you have an impeller for 5hp model TN Johnsons OR 10-15-18hp motors.  They’re all the same except for bore size.

[Bob Wight]

As Frank noted, the correct impeller number is now superseded to 434424.   The newer total pump kit which includes the impeller, impeller plate, impeller cup, pump housing, gasket, grommet and screws is part #763758.

Bob

1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1955 Johnson QD-16
1957 Evinrude Fastwin 18
1957 Evinrude 3022
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20

“Every 20 minute job is only a broken bolt away from a 3-day project.”
"Every time you remove a broken or seized bolt an angel gets his wings."

[crosbyman]

Water Pump Impeller Repair Kit, Fits for Evinrude Johnson OMC 5.5 6 7 HP 763758 778166 Outboard, Water Pumps – Amazon Canada

I  just refurbished CD GC and had issues with the shock absorber… if you experience binding below the impeller housing make certain the shock absorber measures 6 inch 11/16th

I resised mine with a hammer  and add the s.a. welded .. resealed GC and pressure tested it to 15psi 🙂

Joining AOMCI has priviledges 🙂

[fleetwin]

I would stick with OEM parts when it comes to the water pump parts/impeller.   Beware of shady sellers, including amazon, aftermarket junk often hidden behind OMC part numbers/insignias

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olcah

[Author]

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