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ENGINE: CRANKSHAFT AND MAIN BEARINGS
49
Flush oil passages by a gasoline jet and dry
with
air blast.
Next insert new passage plugs using driver
A. 86014 and stake them around by means of a
punch.
Main Bearings.
Minor scratches on main bearing inserts can be
smoothed out by means of an extremely refined
grinding stone.
In
case of grooves, signs of seizure or remarkable
wear renew bearing inserts.
In fact
thin-wall bearings cannot be reworked or
adapted.
If
on inspection bearing inserts tum out to be
still usable, check their clearance to crankshaft
journals as follows:
- Place a piece of «Plastigage _ calibrated wire
on journal
(fig.
76).
- Install
main bearing journals and inserts.
Fig. 74 • Main bearing caps with bearing Inserts In place.
1.
Front cap.· 2. Intermediate cap.• 3. Rear cap.••, 5, 6. Beating
Inserts.
MAIN BEARING INSERT THICKNESSES
Undersizes
Standard
.01"
.02"
.03"
.04"
(0.234
nun)
(0.508
mm)
(O.762
nun)
(l.ol6 nun)
.7212"
.7712"
.8212"
.8712"
.9212"
(1.832
mm)
(1.959 nun)
(2.086 nun)
(2.213
mm)
(2.340 nun)
.7248"
.7748"
.8248"
.8748"
.9248"
(1.841
mm)
(1.968
rom)
(2.095
rom)
(2.222
mm)
(2.349
mm)
r - - - - - - , - - j
39.985
1-----,-
,
40,005
_ _ _ _ _ _ _ _150.785
1-----
50.805
"
"
110J7~
I
111.51~
I
1
'8
.
370
I
10.614
11.783
18.61t
I
I
I
I
1
,
.
831
I
1.841
I
,
Fig. 75 • Critical dimensions (metric) of crankshaft and main bearing Inserts.
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