Westerbeke 8.0KW-60Hz Service Manual page 58

SERVICE DATA· STANDARDS AND LIMITS
Component
ENGINE COMPONENTS
Standard
inm (inches)
Repair Umlt
mm (inches)
Compression pressure ............. .427 psi at 280 rpm ............••.....• 384 psi
. . " (30.0 kg/cm') (27.0 kg/cm')
" 2942 kPa 2648 kPa
Maximum permissible difference •. ..42.7 psi
between average compression (3.0kg/cm')
pressure 01 all cylinders 294 kPa
Injection timing at BToC .......••..............• 17'
Rocker arm bore lor 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 01 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 • 0.009B) .................... (0.059)
Valve seat
Angle ................................................. 45'
Width ............................... 1.3 -1.B (0.051 - 0.071) ............ 2.5 (0.09B)
Valve spring
Free length .................................. .47 (I.B5) ......................... .46 (I.Bl)
Length under test force ............. 39.1 (1.54)
30.5 (1.20)
Testforce 39.1 (1.54) ................ 13.9.0.7 .............................. -15%
[kgl (lbf)(N)] 30.6. 1.5
136.7
Test force 30.5 (1.20) ................... 29. 2 ................................ -15%
[kgl (lbl)(N)] 64 • 4.4
" 284.20
Warpage 01 cylinder head ..................... 0.05 .................................. 0.10
(bottom lace) (0.0020) max (0.0039)
Bend (dial reading) 01 valve push rod ........................................ 0.3 (0.012)
Timing Gear Backlash
Crankshaft gearfldler gear ......... 0.04 - 0.12 .............................. 0.30
(0.0016 - 0.0047) (0.0118)
Idler gear/camshaft gear ............ 0.04 - 0.12 .............................. 0.30
(0.0016 - 0.0047) (O.OIIB)
Idler gear#uellnjection ... : .......... 0.04 - 0.12 .............................. 0.30
pump camshaft gear· (0.0016 - 0.0047) (0.011.8)
Camshaft gear/P.T.O. gear ......... 0.08 - 0.19 .............................. 0.30
(0.0031 - 0.0075) (0.011 B)
Fuel injection pump camshaft ... 0.07 - 0.20 .............................. 0.30
gear and oil pump gear (0.0028 - 0.0079) (0.011 B)
Lobe height 01 camshaft .............. 35.72 (1.4063 .................. 34.72 (1.3669)
'Component
ENGINE COMPONENTS
Lobe height of fuel injection
Standard
mm (inches)
Repatr Limit
mm (Inches)
pumpcamshaft .................................. 44 (1.73) ....................... .43 (1.3669)
Aatness ojflywheel ................... OJ5 (0.0059) max ................ 0.50 (0.0197)
Clearance between tappet
and cylinder block ................................................................... 0.15 (0.0059)
Clearance between camshaft
joumal 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 lace ...... : ................... : ............ 0.05 (0.0020) max ................ 0.l0 (0.0039)
Bore in cylinder block ...............
78.0~·
(3.07 ''''') ................ 78.2 (3.079)
Taper and out·ol-.... : ................... O.Ol (0.0004)max
round of cylinder
Piston Pin 0.0 ............................... 22.944 - 23.00
......................................... (0.90527 - 0.90551)
Diametllr 01 piston
Standard ................................... 77 .93 - 77.95 .......................... 77.80
(3.0681 - 3.06B9) (3.0630)
0.25 (0.009B) ........................... 78.18-78.20 .......................... 78.05
Oversize (3.0779 - 3.0787) (3.0728)
0.50 (0.0197) ........................... 78.43 - 78.45 .......................... 78.30
OverSize (3.0878 - 3.0886) (3.0827)
Clearance between piston ............. 0.006 - 0.01 B .......................... 0.050
pin and piston (0.00024 - 0.00071) (0.00197)
Clearance betlwen 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
ring (0.0020 - 0.0035) (0.0079)
Oil ring ......................................... 0.03 - 0.7 .............................. 0.20
(0.0012 - 0.0028) (0.0079)
Clearance between ends 01 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 Jod bearing (0.0009B - 0.00283) (0.00591)
Thrust clearance for ......................... 0.10 - 0.35 .............................. 0.50
connecting rod big end (0.0039 - 0.013B) (0.0197)
Connecting rod bendflwist 0.05/100 (0.0020/3.94 max.)
0.15/100 (0.005913.94 max.)
Engines & Gimerators "
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