Lotus Elise Service Notes page 220

ENGINE
Crankshaft • inspection
1. Clean joint surfaces on bearing ladder and
cylinder block using suitable solvent.
DO NOT USE A METAL SCRAPER ON
SEALING SURFACES.
Blow out crankshaft and bearing ladder
oilways.
2. Measure total thickness of thrust washers
removed and compare with new.
Total thickness ol new thrust washer halves =
5.22 to 5.30 mm.
3. Subtract total thickness of original thrust
washers from total thickness of new thrust
washers.
4. Add figure obtained to crankshaft end-float
figure obtained.
5. If resultant figure will ensure crankshaft
end-float is within limits specified, fit new thrust
washers. If fitting new thrust washers will not
bring end-float within limits, crankshaft must be
replaced.
Crankshaft end-float = 0.10 to 0.25 mm
Service limit = 0.34 mm
6. Record main bearing code letters from bearing
ladder.
Record main bearing code numbers from
crankshaft front web. First letter and number is
Number 1 main bearing.
~ CAUTION: Crankshafts fitted to later
/ j \ engines have increased main journal
diameters. Commencing engine numbers
for the modified crankshafts are listed in
Information. The modified crankshafts may be
fitted as replacements to engines prior to these
engine numbers. For inspection purposes,
journal sizes on crankshafts fitted to early
engines are listed as Type A whilst those fitted
to later engines are listed as Type B. Main
bearing shell sizes and colour codes for both
types of crankshaft remain unchanged.
7. Check crankshaft main journal diameters:
Type A crankshafts
Crankshaft journal tolerance:
Grade 1 = 47.993 to 48.000 mm
Grade 2 = 47.986 to 47.993 mm
Grade 3 = 47.979 to 47.986 mm
Clearance in bearings = 0.02 to 0.05 mm
Maximum out of round = 0.010 mm
Type B crankshafts
Crankshaft journal tolerance:
Grade 1 = 48.000 to 48.007 mm
Grade 2 = 47.993 to 48.000 mm
Grade 3 = 47.986 to 47.993 mm
Clearance in bearings = 0.013 to 0.043 mm
Maximum out of round = 0.010 mm
8. Replace crankshaft if outside tolerance.
9. Determine the appropriate bearing shells to be
fitted from the main bearing size selection and
type tables.
OVERHAUL 8 3