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Mercury 90 Service Manual

Mercury 90
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5B-14 - MID-SECTION 90-830234R3 DECEMBER 1997
Troubleshooting Flow Diagram
Manual release valve and/or
O-ring damage.
Replace defective valve and O-rings.
Manual release valve and O-rings ap-
pear to be OK. Replace O-rings and pro-
ceed.
No debris or defective
components found.
Inspect Manifold Reverse
Thrust Valve.
Debris found in check
valve components.
Clean check valve components
using engine cleaner and com-
pressed air or replace.
Inspect Manual Release Valve.
Outboard will not hold tilted position in
reverse and/or trails out during high
speed deceleration.
Result Result
Result Result
Replace Pump and Manifold Assembly.
Inspect Trim Rod Piston Check Valve.

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Mercury 90 Specifications

General IconGeneral
BrandMercury
Model90
CategoryOutboard Motor
LanguageEnglish

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