Service Standards And Limits - Westerbeke 6.5 MCG Service Manual

SERVICE DATA./ STANDARDS AND LIMITS.. BCG. ENGINE/GENERATOR:
Component Specified Value
I
standard Repair Limit
inches(mm) inches(mm)
FRONTCAS~OUNTERBALANCESHAFT
Oil
Pump
Side
Clearance
Driven Gear .......................... 0.0024-D.0047 (0.06-D.12)
Drive Gear ............................ 0.0027·0.0051 (0.07-0.13)
Counterbalance Shaft Front Journal Diameter.
................................. 0.7869-0.7874 (19.987-20.000)
Counterbalance Shaft Rear Journal Diameter
................................ 1.7317-1.7322 (43.984-44.000)
Counterbalance Shaft Front Journal Oil Clearance
. • .............................. 0.0014- 0.0027 (0.035
~
0.068)
Counterbalance Shaft Rear Journal Oil Clearance
................................ 0.0014 - 0.0028 (0.035 - 0.071)
CYLINDER BLOCK
CXIinder Bore
2.5591-2.5602 (65.00-65.03)
Out-of-Roundness and
Taper of Cyfinder Bore 0.0004
(less
than 0.01)
Gasket Surface Flatness 0.0020 (less than 0.05)
CYLINDER HEAD
0:0039 (0.1)
Aatness. of Gasket Surface . .Jess
th~n
0;0019 (0.05) ........
,o.ooni
(0.2) ·
Overall Height ...................... 4.287-4.295 (108.9-109.1)
Cylinder Head oversize rework dimension of valve seat hole
Intake 0.3 O.S ...... 1.2323 - 1.2333 (31.300 -31
;32~}
intake 0.6
o.s .....
1.2441 - 1.2451 (31.600 - 31.625)
Exhaust · 0.3 0.8 .... 1.1535 -1.1544 (29.300- 29.321)
Exhaust 0.6 O.S .... 1.1653 -1.1662 (29.600- 29.621)
Cylinder Head rework of valve guide hole (both Intake and exhaust)
0.05
o.s ..................
0.4744- 0.4751 (12.050 -12.068)
0.25
o.s ..................
0.4823- 0.4830 (12.250 ·12.268)
0.50 0.8 .................. 0.4921 -0.4928 (12.500 ·12.518)
Intake Valve Seat Angle ........................ .45°
Exhaust Valve Seat Angle ...................... 30°
Intake Valve Seat Width .................. 0.079 (2.0) ........................ 0.004 (0.1)
Exhaust Valve Seat
~idth
............... 0.079 (f.O) ........................ 0.004 (0.1)
valve Clearance ........................................ .
Exhaust ...................................... 0.012 (0.30)
lntake ..................................... : ... 0.008 (0.20)
Valve Head Thickness (margin)
(Intake) ......................................... 039 (1.0) ........................... 020 (.5)
(Exhaust) ...................................... 051 (1.3) ............................. 031 (8)
Valve Length
(Intake) ..................................... 3.960 (100.6)
(Exhaust) .................................. 3.968 (100.8)
Valve Stem O.D.
Intake ......... : ............. :0.2585 - 0.2591 (6.565 - 6.580)
Exhaust ...................... 0.2571 - 0.2579 (6.530 - 6.550)
Stem to Guide Clearance
Intake ......................... 0.0008- 0.0020 (0.02- 0.05) ...... 0.0039 (0.10)
Exhaust ................... 0.0020- 0.0033 (0.0050- 0.0085) .. 0.0059 (0.15)
Valve Guide Length
(lntake) ......................................... 1.73 (44)
(Exhaust) ....
m ............................
1.949 (49.5)
Component
-VALVES
Specified Value
I
Standard
lncbes(mm)
Valve
Guide Service Size
0.05, 0.25, 0.50
oversize
Valve Seat Width of
Seat Contact ............................... 035-.051 (0.9·1.3)
Valve Seat Angle .............................. 3o•J44°/65°
Repair Limit
lilcbes(mm)
Valve Seat Slnk ............................................................................ O.OOB (0.2)
Valve Spring Free Length ................ 1.823 ( 46.3) ...................... 1.783 ( 45.3)
Valve Spring
Load/lnstaUed Height .
lbs.llri
(N/mm) .......................... .46/1.48 (210137.7)
Squareness ... ~ .... ; ........................... ;.less than 2° ............................. .4°
TIMING-BELT
. Seal Une Clearanc_e_ .. : ......... : ........... : .... 47 (12).
ROCKER
ARMiCAMSHAFT.
Camshaft
Height
No.1 (lntake) .......................... 1.3815 (35.09) .................. 1.3618 (34.59)
No. 2 (Intake) .......................... 1.3807 (35.07) .................. 1.361 0 (34.57)
No.3 (lntake) .......................... 1.3803 (35.06) .................. 1.3606 (34.56)
No.1 (Exhaust) ....................... 1.3839 (35.15) .................. 1.3642 (34.65)
No.2 (Exhaust) ....................... 1.3831 (35.13) .................. 1.3634 (34.63)
No.3 (Exhaust) ...................... 1.3854 (35.190) ................ 1.3657 (34.69)
Camshaft Journal
Diameter .......................... 1.6118-1.6124{40.940·40.955)
Bearing Oil Clearance .......... 0.0018-D.0033 (O.Q45-D.085
End Play .................................... 0024-.0055 (.06·.14) ................. 1 i 8 (.03)
Rocker Shaft Length ........................ 9.134 (232)
Rocker Arm Shaft
Outer Diameter ..... :.0.6687- 0.6692 (16.985- 16.998)
Clearance ................... 0.0005 - 0.0017 (0.012 - 0.043) ...... 0.004 (0.1)
PISTON AND CONNECTING ADD
Piston Outer Diameter ...... 2.5579-2.5591 (64.97·65.00)
Piston
to
Cylinder Clearance
.................................. 0.0008- 0.0016 (0.02- 0.04)
Pismn Ring Grove Width
No.1 ............................. 0.0480- 0.0488 (1.22 -1.24)
No.2 ..... ~ ....................... 0.0476- 0.0484 (1.21 -1.23)
011 .............................. 0.1108- 0.1116 (2.815- 2.835
Piston Service Size ............... 0.25, 0.50, 0.75, 1.00 OS
Piston Ring End Gap
No.1 ............................. 0.0059- 0.0118 (0.15- 0.30) ........ 0.0315 (0.8)
No.2 ............................. 0.0138- 0.0197 (0.35 • 0.50) ........ 0.0315 (0.8)
Oll ................................ : ... 0.008- 0.028 (0.2 - 0.7) ............ 0.0394 (1.0)
Piston Side Clearance
No.1 ............................. 0.0012 • 0.0028 (0.03 - 0.07) ...... 0.0047 (0.12)
. No.2 ............................. 0.0008- 0.0024 (0.02- 0.06) ...... 0.0039 (0.10)
Piston Pin 0.0 .............. 0.6300 • 0.6302 (16.001 ·16.007)
Piston Pin Press-In Load lbs(N)
................................... 1102. 3307 (5000 -15000)
IW"IWES'I"ERBEKE
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