Westerbeke Universal M-50 - Engine Specifications Overview

ENGINE SPECIFICATIONS
ENGINE BODY
Cylinder Head
Item M-30
M-40
Cylinder head surface 0.05 mm
0.05 mm
flatness
(0.002
in.) (0.002 in.)
Top clearance
0.7
to 0.9 mm
0.7 to 0.9 mm
(0.028 to 0.035 in.) (0.028 to 0.035 in.)
Free
1.30 to 1.60 mm 1.30 to 1.60 mm
Gasket
(0.051 to 0.063 in.) (0.051 to 0.063 in.)
thickness
Tightened
1.05 to 1.15 mm 1.05 to 1.15 mm
(0.041 to 0.045 in.) (0.041 to 0.045 in.)
Gasket shim thickness
0.2 mm 0.2 mm
(0.008 in.) (0.008 in.)
Compression pressure
448 psi 448 psi
Variance among
cylinders
- -
Valves (IN., EX.)
Valve clearance (cold)
0.18 to 0.22 mm
0.18 to 0.22 mm
(0.007 to 0.008 in.) (0.007 to 0.008 in.)
Valve seat width
2.1 mm
2.1 mm
(0.083 in.) (0.083 in.)
Valve seat angle
45
0
45
0
Valve face angle
45
0
45
0
Valve recessing
1.1 to 1.3 mm
1.1 to 1.3 mm
(0.043 to 0.051 in.)
(0.043 to 0.051 in.)
Clearance between valve 0.04 to 0.07 mm
0.04 to 0.07 mm
stem and guide
(0.001 to 0.003 in.) (0.001 to 0.003 in.)
Valve stem O. D.
7.960 to 7.975 mm
7.960 to 7.975 mm
(0.313 to 0.314 in.)
(0.313 to 0.314 in.)
Valve guide 1.0.
8.015 to 8.030 mm
8.015 to 8.030 mm
(0.315 to 0.316 in.)
(0.315 to 0.316 in.)
Valve Timing
Open
0.35 rad.
0.35 rad.
Inlet valve
(20
0
before TDC
(20
0
before TDC)
Close
0.79 rad.
0.79 rad.
(45
0
after TDC
(45
0
after TDC
Open
0.87 rad.
0.87 rad.
(50
0
before TDC
(50
0
before TDC
Exhaust valve
Close
0.26 rad.
0.26 rad.
(15
0
after TDC
(15
0
after TDC)
Valve Springs
Free length
41.7 to 42.2 mm
41.7 to 42.2 mm
(1.642 to
1.661 in.)
(1.642 to
1.661 in.
Tilt
1.0 mm
1.0 mm
(0.039 in.)
(0.039 in.)
Tension
1.117 N.
1.117 N
(12 kgf, 26.5 Ibs.)
(12 kgf, 26.5 Ibs.)
8