Assembly; Leak Down Check - Pilot Valve Assembly; Leak Down Check - Manual Release Valve; Leakage Past Ball And Seat - Piston Assembly - Mercury 45 Jet 50-55 Service Manual

Table of Contents

Leak Down Check – Pilot Valve As-

1. Debris or chips between valve and seat (a), usu-

ally imbedded in rubber valve seat.

2. Pilot valve installed from non-chamfered end of

spool results in nicked or damaged O-ring (b).

3. Nicked or deteriorated O-ring (c).

A leak path is created between the UP side of the cyl-

inder and the reservoir. The trim system will leak

DOWN until the trim port in cylinder is covered.

a - Valve and Seat

b - Pilot Valve O-ring

Leak Down Check – Manual Release

1. Debris or chips under O-ring (a).

2. Flash from valve molding causing O-ring (a) to not

3. Nicked O-ring (a).

90-817643R1 DECEMBER 1996

Leakage Past Ball and Seat – Piston

Assembly

Unit will trim to full or near full DOWN position and

then will begin to trim UP while trim switch is held in

"DOWN" mode.

If trim switch is released, outboard can be pushed (by

hand) DOWN to the point where trim UP started.

1. Inspect balls and seats in piston assembly for de-

a - Ball and Seat. Check for Debris or Damage

bris or damage. Repair or replace balls/seats.

MID-SECTION - 5C-13

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