Sterndrive Will Not Stay In The Trimmed Out/Up Position When Underway; Sterndrive Unit Trails Out / Up On Deceleration Or When Shifting Into Reverse; Unit Thumps When Shifting; Oil Foams Out Of Pump Fill / Vent Screw - Mercury BRAVO Service Manual

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SERVICE MANUAL NUMBER 28

Sterndrive Will Not Stay In The Trimmed OUT/UP Position When Underway

Air in trim system.

Leaky poppet valve.

Sterndrive Unit Trails OUT/UP On Deceleration Or When Shifting Into Reverse

Trim cylinders(s) leaking internally.

Trim pump IN/DOWN circuit leaking

Oil Foams Out Of Pump Fill/Vent Screw

Contaminated oil.

Oil level low.

90-863160 MAY 2000

Special Instructions

Check for cause of entry. Fill and bleed

Install repair kit for poppet valve 1.

Special Instructions

Test. (Refer to SECTION 5A) Rebuild or

replace cylinders as necessary.

Test. (Refer to SECTION 5A) Replace

adaptor or attempt to repair by

replacing the following:

D Pilot check valves or seals

D Install trim pump rebuild kit

Special Instructions

Flush system with clean oil refill pump

and bleed trim system.

Check for cause of low oil level and

correct. Add oil to pump and bleed

TROUBLESHOOTING