Mercury 40 FourStroke User Manual

CYLINDER HEAD
90-857046R1 NOVEMBER 2001 Page 4A-33
5. Measure valve stem runout, replace if out of specification.
Valve Stem Runout Limit (Max.)
Intake Valve
Exhaust Valve
0.0006 in. (0.016 mm)
Valve Springs
1. Check each spring under load on a spring tester. Replace any weak springs.
2. Check free length limit of each spring. Replace valve springs if not in specification.
Valve Spring Free Length
1.491 - 1.569 in. (37.85 – 39.85 mm)

Mercury 40 FourStroke Specifications

General

Brand	Mercury
Model	40 FourStroke
Category	Outboard Motor
Language	English