Yamaha 15C Service Manual

2-3
MAINTENANCE SPECIFICATIONS
SPEC
MAINTENANCE SPECIFICATIONS
ENGINE
Item Unit
Model
9.9C 15C
Cylinder head
Warpage limit mm (in) 0.10 (0.0039)
Cylinder
Bore size mm (in) 56.000–56.020 (2.2047-2.2055)
Wear limit mm (in) 56.1 (2.21)
Taper limit mm (in) 0.08 (0.0032)
Out-of-round limit mm (in) 0.05 (0.0020)
Piston
Piston diameter (D) mm (in) 55.940–55.985 (2.2024–2.2041)
Measuring point (H) mm (in) 10.0 (0.39)
Piston-to-cylinder clearance mm (in) 0.035–0.040 (0.0014–0.0016)
Wear limit 0.09
Piston pin boss bore mm (in) 14.004–14.015 (0.5513–0.5518)
Piston pin
Outside diameter mm (in) 13.996–14.000 (0.5510–0.5512)
Piston rings
Top ring Keystone
Dimension B mm (in) 1.98–2.00 (0.0780–0.0787)
Dimension T mm (in) 2.40–2.60 (0.0945–0.1024)
End gap mm (in) 0.15–0.35 (0.0059–0.0138)
Side clearance mm (in) 0.02–0.06 (0.0008–0.0024)
2nd ring Barrel
Dimension B mm (in) 1.96–1.98 (0.0772–0.0780)
Dimension T mm (in) 2.40–2.60 (0.0945–0.1024)
End gap mm (in) 0.15–0.35 (0.0059–0.0138)
Side clearance mm (in) 0.04–0.08 (0.0016–0.0032)
Reed valve
Valve stopper height mm (in) 0.6–0.7 (0.02–0.03) 5.9–6.1 (0.23–0.24)
Valve vending limit mm (in) 0.200 (0.0079)
Connecting rod
Small end inside diameter mm (in) 18.000–18.011 (0.7087–0.7091)
Big end inside diameter mm (in) 28.039–28.052 (1.1039–1.1044)
Crankshaft
Crank width (A) mm (in) 46.90–46.95 (1.85–1.85)
(B) mm (in) 25.90–26.10 (1.02–1.03)
Runout limit (D) mm (in) 0.03 (0.0012)
Big end side clearance (E) mm (in) 0.300–0.800 (0.0118–0.0315)
Maximum small end axial play
(F) mm (in) 2.0 (0.08)
Chapter2 03.11.14 20:06 Page 3

Yamaha 15C Specifications

General

Brand	Yamaha
Model	15C
Category	Outboard Motor
Language	English