Reply To: Uncertainty regarding Sierra Gear Case Seal Kit

[Bob Wight]

Not sure about why the kit includes 2 prop shaft seals if they are in fact the same size but seal kits often include multiple seals that would fit different horsepower size models.   On my 1972 Sportster 25hp, there was in fact 2 original seals used on the driveshaft mounted one over the other, facing in opposite directions as you noted.  Here’s a picture of the 2 original seals I pulled, lower seal on the left upper seal on the right.

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
1982 Evinrude 25hp

“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."