Service Data-Standards And Iimits - Westerbeke 8.0KW-60Hz Service Manual

SERVICE DATA - STANDARDS AND LIMITS
Component
ENGINE COMPONENTS
Standard
mm (inches)
Repair Limit
mm (inches)
Compression pressure """, ..... .427 psi at 290 rpm .............. 384 psi
(30.0 kg/cm') (27.0 kg/em')
2942 kPa 2648 kPa
Maximum permissible difference
between average compression
pressure of all cylinders
Injection timing at BTDG ...
.... 42.7 psi
(3.0kg/cm')
294 kPa
.. ....... 17"
Rocker arm bore for shaft .......... 18.910 -18.930
... (0.74449 - 0.74527)
Rocker arm shaft 0.0 ................. 18.880 -18.898
.......................................... (0.74331 - 0.7440)
Clearance between rocker
arm and shaft (oil clearance) ........ 0.012 - 0.050 .......................... 0.200
0.00047 - 0.00197 .................. (0.00787)
Valve stem 0.0 ................................ 0.260 (6.6)
Height of valve guide .................. 0.39 (10)
Valve clearance ............................. 0.25 (0.0098)
Stem to guide clearance
Intake ........................... 0.02 - 0.05 (0.008 - 0.0020) ...... 0.10 (0.0039)
Exhaust ................ 0.05 - 0.085 (0.0020 - 0.00335) .... 0.15 (0.0059)
Valve margin ................................... 1.0 (0.039) ...................... 0.5 (0.020)
(valve lip thickness)
Valve sinkage ................................... 0.5 ± 0.25... .. ............... 1.5
(0.020 ± 0.0098) .................... (0.059)
Valve seat
Angle... . ........................... 45 0
Width... .. .......... 1.3 -1.8 (0.051 - 0.071) ............ 2.5 (0.098)
Valve spring
Free length.. . ........... ..47 (1.85) ........................ .46 (1.81)
Length under test force ........... 39.1 (1.54)
30.5 (1.20)
Testforce 39.1 (1.54) .............. 13.9±0.7 .. .
(kgf(lbf)(N)] 30.6 ± 1.5
136 ± 7
. ..... -15%
Test force 30.5 (1.20) .................. 29 ± 2 ................................ -15%
[kgf (lbf)(N)] 64 ± 4.4
284± 20
Warpage of cylinder head ... .. ..... 0.05 .................................. 0.10
(bottom face) (0.0020) max (0.0039)
Bend (dial reading) of valve push rod.. .. ... 0.3 (0.012)
TIming Gear Backlash
Crankshaft gearMler gear ........ 0.04 - 0.12... .. .......... 0.30
(0.0016 - 0.0047) (0.0118)
Idler gear/camshatt gear ........... 0.04 - 0.12 ............................ 0.30
(0.0016 - 0.0047) (0.0118)
Idler
gear~uel
injection ............. 0.04 - 0.12 ............................. 0.30
pump camshaft gear (0.0016 - 0.0047) (0.0118)
Camshaft gear/PTO. gear ........ 0.08 - 0.19 ...
(0.0031 - 0.0075)
...0.30
(0.0118)
Fuel injection pump camshaft , .. 0.07 - 0.20 "." ..... " ..... " .......... 0.30
gear and oil pump gear (0.0028 - 0.0079) (0.0118)
Lobe height of camshaft ............. 35.72 (1.4063 .................. 34.72 (13669)
Component
ENGINE COMPONENTS
Lobe height of fuel injection
Standard
mm (inches)
Repair Limit
mm (inches)
pump camshaft ............................... .44 (1.73) ........................ 43 (1.3669)
Flatness of flywheel ................. 0.15 (0.0059) max ............... 0.50 (0.0197)
Clearance between tappet
and cylinder block ......................................................... 0.15 (0.0059)
Clearance between camshaft
lournal and bushing ............................................................... 0.15 (0.0059)
Clearance between idler .................. 0.03 - 0.07 ............................. 0.20
gear and shaft (0.0012 - 0.0028) (0.0079)
Warpage of cylinder block
top face ...................................... 0.05 (0.0020) max ............ 0.10(0.0039)
Bore in cylinder block ............. 78.0
.0.03
(3.07
.GOO11) ••..•.•••.....
78.2 (3.079)
Taper and out-of- ....................... 0.01 (0.0004)max
round of cylinder
Piston Pin 0.0 ............................. 22.944 - 23.00
....................... (0.90527 - 0.90551)
Diameter of piston
Standard .................................. 77.93 - 77.95 ....................... 77.80
(3.0681 - 3.0689) (3.0630)
0.25 (0.0098) ..
Oversize
............ 78.18 -78.20 ..
(3.0779 - 3.0787)
.. ........ 78.05
(3.0728)
0.50 (0.0197) .......................... 78.43 -78.45 .......................... 78.30
Oversize (3.0878 - 3.0886) (3.0827)
Clearance between piston .......... 0.006 - 0.018.. . .................. 0.050
pin and piston (0.00024 - 0.00071) (0.00197)
Clearance between piston ring and groove
No.1 Compression ..................... 0.06 - 0.10 ............................ 0.30
ring (0.0024 - 0.0039) (0.0118)
No.2 Compression .................... 0.05 - 0.09 .. . .. ...... 0.20
(0.0079) ring (0.0020 - 0.0035)
Oil ring ....................................... 0.03 - 0.7 ......................... 0.20
(0.0012 - 0.0028) (0.0079)
Clearance between ends of piston ring
No.1 Compression ..................... 0.15 - 0.30 ........................ 1.50
ring (0.0059 - 0.0118) (0.059)
No.2 Compression .................. 0.15 - 0.35 ............................. 1.50
ring (0.0059 - 0.0138) (0.059)
Oil ring ..................................... 0.20 - 0.40 ......................... 1.50
(0.0079 - 0.0157) (0.059)
Clearance between ........................ 0.035 - 0.086 .......................... 0.300
piston and cylinder (0.00138 - 0.00339) (0.01181)
Clearance between crankpin ......... 0.025 - 0.072 .......................... 0.150
and connecting rod bearing (0.00098 - 0.00283) (0.00591)
Thrust clearance for ..................... 0.10 - 0.35 ............................. 0.50
connecting rod big end (0.0039 - 0.0138) (0.0197)
Connecting rod bend/twist
0.05/100 (0.0020/3.94 max.)
0.15/100 (0.0059/3.94 max.)
Engines & Generators
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