Powerhead
Page 4A-2 90-8M0050731 MAY 2011
Powerhead Specifications
Powerhead Specifications
Number of cylinders 6
Displacement 2.5 liter (153 in³)
Stroke 67.3 mm (2.65 in.)
Standard cylinder bore diameter 88.925 mm (3.501 in.)
Cylinder bore maximum taper (service) 0.076 mm (0.003 in.)
Cylinder bore maximum out of round (service) 0.076 mm (0.003 in.)
Oversize cylinder bore diameter ‑ 0.038 mm (0.015 in.) 88.963 mm (3.516 in.)
Cylinder liner type Cast iron
Compression
620–758 kPa (90–110 psi)
1.
Crankshaft
Maximum runout 0.152 mm (0.006 in.)
Piston type Aluminum
Piston skirt standard diameter 88.6968–88.7222 mm (3.492–3.493 in.)
Piston skirt oversize diameter ‑ 0.038 mm (0.015 in.) 88.0778–89.1032 mm (3.507–3.508 in.)
Reed stand open (maximum) 0.51 mm (0.020 in.)
Water pressure
At 900–1000 RPM 1.4–41 kPa (0.2–0.6 psi)
At 5500 RPM (boat on plane) 69–103 kPa (10–15 psi)
Lubricants, Sealants, Adhesives
Tube Ref No. Description Where Used Part No.
7
Loctite 271 Threadlocker
Divider plate screw threads
Lower end cap oil seals
92-809819
12
Loctite Master Gasket Kit
Crankcase cover and cylinder block mating surface
Crankcase cover and cylinder block mating surface
92-12564 2
14
2-cycle Premium Outboard
Oil
Upper end cap bearing and end cap O-ring surface
Cylinder head screw threads and face
Connecting rod screws, lower ball bearing, piston rings
Cylinder bores after honing
Main bearings
Center main crankshaft roller bearings and races
O-ring seal surface of end cap
Roller bearing
Crankshaft sealing rings
Crankshaft sealing rings and lower crankshaft end oil seal
Piston and cylinder wall
Cylinder bores and pistons
Threads and face of connecting rod screws
Center main screw and perimeter screw threads and face
O-rings on the fuel rail air compressor hose fitting
92-858021K01
33
Loctite 680 Retaining
Compound
Cylinder block stud threads 92-809833
34
Special Lubricant 101 Driveshaft splines 92-802865Q02
1. When performing cylinder compression test, place lanyard switch in the "OFF" position to prevent operation of direct injectors or remove fuse
controlling fuel and direct injectors.
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