Westerbeke 8.0KW-60Hz Service Manual page 32

(
ENGINE INSPECTION
(3) If the clearance exceeds the limit, install a new
bearing and check the clearance again.
(4) If the clearance still exceeds the limit, grind the "
journal to O.25mm (0.0098 in), 0.50mm (0.0197 in)
or 0.75mm (0.0295 in) undersize and use undersize
main bearing.
JOURNAL UNDERSIZES
0.25mm (0.0098 In)
FINISH 51.75 •.• , mm (2.0374 ...... In)
0.50mm (0.0197 in)
FINISH 51.50· •.• , mm (2.0276 ...... , In)
0.75mm (0.0295 in)
FINISH 51.25 ... , mm (2.0177 ....... In)
JOURNAL FILLET! . ;
RADIUS .
~.
A
CAUTION:
Grind all the crankiins of one
crankshaft to the same undersize;
Finish the crank pin fillets to a radius
of
0.081n
{2.0mmj.
(5) Support the crankshaft on its front and rear journals
in V-blocks or in a lathe and check the ronout at the
center journal with a dial indicator. Depending on
the amount of mnout, repair the crankshaft by
grinding or by straightening with a press. If ronout
exceeds the limit, replace the crankshaft.
CRANKSHAFT RUNOUT
STANDARD
LIMIT
0.00098 In (0.025mm)
0.0020 In (0.05m!11)
•
(6) Use a gear puller to remove the ge';" from the
crankshaft.
NOTE: Do not remove the gear. Wlless the gear or crankshaft
is defective. .
(7) Installation of the crankshaft gear. Install the key in .
position on the crankshafi; Install the gear in .
position with its keyway . with the key.
17. tyUnderBlock
a. Measure the bore at the top, middle and bottom points
. ,. on axes A and, B with a cylinder bore gauge. If any
, one of the cylindiirs eXceeds the limit, hone out all the
bores for oversize pistons.
PISTON AND PISTON RING BORE
STANDARD' 3.07 in •.•• ,
CODE, STD (78mm ••.• )
OVERSIZE 3.0807 In •.•• ,
0.009B In (0.25mm) (7B.25mm .... )
CODE: 25
OVERSIZE 3.0905 In .... ,
0.0197 in (0.50mm) (7B.50mm •. 0)
CODE: liD
LIMIT,
+0.0008 In ,.
(+O.2mm)
+O.OOOB in
(+0;2mm)
+O.OOOB in
(+0.2mm)
TAPER AND OUT OF ROUND 0.0004 In (0.01mm)
·~6~~D
'6j'
" MEASURING
, ' ," " , DIRECTION
o
=~
DO~
(I
If
,
' t
-
'
. -
MEASURING
,BORE
;'IN THE
, CYLINDER
, BLOCK
,b. Using a heavy accurate straight edge and a feeler
gauge, check the top face for warpage in two positions
'lengthwise, two crosswise and two widthwise. If
warpage exceeds the limit, reface the top face with a
'surface grinder.
. WARPAGE OF CYLINDER BLOCK TOP FACE
'~TANDARD
0.0020 In (0.05mm)
LIMIT 0.0039 In (0.10mm)
18. Manifold inspection. Using a straight edge
~d
a feeler
gauge, check the flange faces 'of the manifold for
warpage. If warpage e)lceedS the limit, recondition Or
replace the manifold. "
WARPAGE OF THE FLANGE: 0.0059 In (0.15mm) ,
Engines
&
Generators
26