Evinrude Service Bulletin SB-598 - Modified Shifter Dog

April 3, 1963. Evinrude announced a four-lug shifter dog for 75 H.P. standard-shift engines. The improved part retained service part number 307095 and was intended for 1960 and later manual-shift gearcases.

Original blue Evinrude Service Bulletin letterhead, April 3, 1963
MODIFIED SHIFTER DOG - 75 H.P. STANDARD SHIFT MODELS
Four-lug Evinrude 75 H.P. shifter dog
Figure 1

An improved shifter dog has been designed and is now being used in production on 75 H.P. standard shift models. This improved shifter dog has four (4) driving lugs on each side (figure 1) and can be identified accordingly.

The improved shifter dog carries the same service part number (307095) as the two lug shifter dog. Part Distributors will continue supplying the two lug shifter dog when part 307095 is ordered, until such time as inventories of the two lug dog are exhausted. At that time they will automatically supply the improved four lug version.

Shifting procedures do not change with use of this new shifter dog. The four lug design merely reduces clutch and gear engagement time - to prolong shifter dog life. Always advocate "snap" shifting as noted in owner manual.

This change in shifter dog design has not necessitated a change in the design of forward and reverse gears. Accordingly, this four lug shifter dog can be installed in any 75 H.P. manual shift gearcase - 1960 and up - without having to change any other parts.

EVINRUDE MOTORS

Richard Bayley
Service Promotion
Manager

Richard Bayley

Historical reference

Part 307095: The original two-lug and improved four-lug shifter dogs shared this service part number. The bulletin states that distributors would supply the improved version after existing two-lug inventory was exhausted.