Johnson Service Bulletin SB-918 - Upper Crankshaft Seal Tools

Here are two new tools, designed to accommodate upper crankshaft seal removal and installation on the subject engines without having to dis-assemble the powerhead. We suggest you include these tools in your special tool set. Similar tools, used on previous 35 and 40 h.p. models, will not fit over the larger crankshafts of the subject models.

(a) Upper crankshaft seal removal with tool #379239.

Difficulty may arise in trying to force the puller past the upper rubber lip of the seal in order to engage the threads of the puller with the metal case of the seal.

To eliminate this problem, use a sharp thin bladed knife to cut away the rubber lip as follows:

1. Push the point of the blade into the rubber lip near the seal case, and cut completely around the circumference, (Fig. 1). Remove loose piece of the lip.
2. Place the puller over the crankshaft and screw it into the seal until it stops. (Fig. 2).
3. Turn the center screw of the puller until the seal is withdrawn from the crankcase, (Figures 3 and 4).

(b) Upper Crankshaft seal installation with tool #309914

Always use tool #309914 when installing the upper crankshaft seal on the subject engines. This tool, properly used, assures that the seal is installed straight and prevents damage to the seal shell during assembly. Oil seepage is generally evident around seals that are not installed straight.

Use tool #309914 as follows,

1. Slip seal over crankshaft with sharp edge of seal shell toward inside of motor.
2. Place the installer over crankshaft and tap seal in place using rawhide mallet. Seal is installed to proper depth when shoulder of installer is against hub, (FIG.5).

The following net prices apply to these tools.

Place your order accompanied with your pre-payment, directly with:

OUTBOARD MARINE CORPORATION PARTS DEPOT
P.O. BOX 470
GALESBURG, ILLINOIS