Service Manual 15-30 HP Gearcase [Gearcase Assembly]

Install new seals back to back in aft end of the propeller shaft bearing housing using Seal Installer, P/N 335821. Apply Gasket Sealing Com pound to the metal casing of the seals before installing. Install the inner seal with lip facing into the bearing housing and install the outer seal with lip facing away from the bearing housing. Apply Triple-Guard grease to seal lips after installing.

1. Seal installer
2. Inner seal
3. Outer seal

Apply Triple-Guard grease to a new bearing housing O-ring. Place the O-ring in the bearing housing groove.

1. O-ring

Coat the shift rod O-ring with Triple-Guard grease and install in shift rod bushing.

Place a new washer and bushing on Shift Rod Bushing Installer, P/N 304515. Apply Gasket Sealing Compound to the outside diameter of the shift rod bushing.

Install new bushing O-ring in outer groove of bushing.

1. Bushing
2. Washer
3. O-ring, outer groove

Use a mallet to drive the bushing into the gear case housing.

Place the nose of the gearcase on a wooden block on the floor. Use Drive Handle, P/N 311880, Bearing Cup Installer, P/N 319929, and a mallet to drive the bearing cup into position in the gearcase housing. Oil the forward bearing cup and seat it firmly in the housing.

1. Forward bearing cup
2. Bearing cup installer

Apply Gasket Sealing Compound to the metal casing of the seals before installing.

Use Seal Installer, P/N 326552, to install the inner seal with flush lip facing into the gearcase, then the outer seal with extended lip facing out of the gearcase.

Apply Triple-Guard grease to the seal lips after installing.

1. Seal Installer, P/N 326552
2. Inner seal
3. Outer seal

Propeller Shaft, Gear and Shifter Installation

IMPORTANT: Make no dry assemblies. Lubricate all bearings, shafts, and gears with gearcase lubricant.

Oil and place the forward bearing cone and roller assembly in the forward bearing cup.

Install the small thrust washer with the chamfered inside diameter facing the pinion gear. Oil and install the thrust bearing. Install the large thrust washer with chamfered outside edge facing up.

1. Small thrust washer, chamfered inside diameter
2. Thrust bearing
3. Large thrust washer, chamfered outside edge

Use a right angled rod to install the pinion assembly in the gearcase.

Place the forward gear into the gearcase.

1. Forward gear

Install the shifter cradle on clutch dog. Grooved end of clutch dog must face forward gear end of the propeller shaft.

1. Grooved end

IMPORTANT: Apply Needle Bearing grease to clutch dog and shifter cradle to hold in place while assembling.

Install the shifter cradle and clutch dog in the gearcase using long-nose pliers.

Apply Triple-Guard grease to a new pivot pin O ring. Install O-ring on the pivot pin. Apply Nut Lock to threads of the pin. Align hole of shifter lever with hole in gearcase. Install and tighten pivot pin to a torque of 60 to 84 in. lbs. (7 to 9.5 N·m).

1. Pivot pin

Wear safety glasses for eye protection. Detent balls can pop out with great force.

Slide the Shift Detent Sleeve, P/N 328081, over the propeller shaft. Align slot in the tool with hole in the propeller shaft.

1. Shift detent sleeve

Insert one detent ball, then the spring, then the other detent ball. Push down on the ball and slide the tool back until you feel the ball slip into the detent.

1. Detent ball

Install the propeller shaft and detent tool in gear case. Make sure the following occurs:

• Propeller shaft must engage forward bearing.
• Tool ramps must engage clutch dog ramps.
• Hold tool firmly against clutch dog.
• Gently tap propeller shaft with a rawhide mallet to seat detent assembly.

Remove detent tool. Slide the reverse gear down the propeller shaft and into the gearcase.

1. Reverse gear
2. Bushing

Coat the reverse gear bushing with oil. Slide the bushing down the propeller shaft, seating the bushing into the reverse gear.

Holding the shifter yoke a with long-nose pliers, install the yoke at a tilted position, locating top of yoke into upper gearcase cavity.

1. Shifter yoke
2. Top of yoke

Engage the shifter yoke hook onto the shifting lever clevis pin in bottom of the gearcase cavity.

1. Shifter yoke hook

Apply Triple-Guard grease to threads of lower shift rod and install into gearcase through the water intake opening and engage the shifter yoke.

Thread the shift rod into the shifter yoke until the rod bottoms in the yoke.

1. Lower shift rod

Propeller Shaft Bearing Housing Installation
Slide the retainer plate down the propeller shaft and into the gearcase with tab facing down.

1. Tab, retainer plate

Wear safety glasses and proceed with care to avoid unsnapping the ring from the pliers.

Using Retaining Ring Pliers, P/N 331045, install the retaining ring into groove in gearcase with sharp outside edge facing aft.

The retaining ring is under extreme pressure during installation. Make sure that the ring is seated in groove.

1. Retaining ring

Thread one Guide Pin, P/N 383175, into the retainer plate.

1. Guide pin

Use Needle Bearing grease to temporarily hold the reverse gear thrust washer on the back of the propeller shaft bearing housing.

1. Reverse gear thrust washer

Lightly apply Gasket Sealing Compound to the aft support flange of the bearing housing. Align the propeller shaft bearing housing on the guide pin with the word "UP" toward the top.

1. Guide pin
2. “UP”

Using a brass punch and a mallet, seat the bearing housing in the gearcase.

Place new O-rings on the bearing housing retaining screws. Apply Gasket Sealing Compound to the O-rings and threads of the screws.

1. Screws

Install one screw in the bearing housing. Remove the guide pin and install the second screw. Tighten screws to a torque of 124 to 142 in. lbs. (14 to 16 N·m).

Apply Adhesive 847 to the bottom of a new exhaust seal assembly and install it into the slot in the gearcase.

1. Seal assembly

To complete gearcase assembly, refer to:
• WATER PUMP SERVICE on p. 250
• GEARCASE LEAK TEST on p. 247
• GEARCASE REMOVAL AND INSTALLATION on p. 248
• Gearcase Lubricant on p. 34
• Propeller Hardware Installation on p. 246
• Trim Tab Adjustment on p. 27.

During break-in period of a reassembled gearcase, change the gearcase lubricant between 10 to 20 hours of operation.