Tolerances and Wear Limits - Engine |
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| NOTE: | B = Bore | S = Shaft |
| Measuring Point | Installation Size with Tolerances |
Clearance (+) or Preload (-) |
Wear Limit | |||
| mm | from | to | mm | |||
| Crankshaft to main bearing Main bearings 1-7 (d1) |
B S |
57.020-57.059 56.971-56.990 |
+0.10 | +0.072 | Visual inspection 56.960 |
|
| Crankshaft to main bearing Main bearing 8 (d3) |
B S |
31.041-31.084 30.980-30.993 |
+0.048 | +0.104 | Visual inspection 30.970 |
|
| Crankpin to connecting rod bearing (d2) |
B S |
57.020-57.059 56.971-56.990 |
+0.030 | +0.088 | Visual inspection 56.960 |
|
| Crankshaft runout (on V-blocks) | max 0.03 | |||||
| Crankshaft unbalance | max 10 cmg | |||||
| Crankshaft to main bearing, end play | +0.110 | +0.195 | 0.30 | |||
| Crankshaft to timing gear | B S |
41.975-42.000 42.002-42.013 |
-0.002 | -0.038 | ||
| Crankshaft to distributor drive gear | B S |
41.975-42.000 42.002-42.013 |
-0.002 | -0.038 | ||
| Crankshaft to flywheel | B S |
65.000-65.030 64.981-65.000 |
0.0 | +0.049 | ||
| Crankshaft to crankshaft pulley | B S |
30.000-30.033 29.960-29.993 |
+0.007 | +0.073 | ||
| Crankshaft pulley: | vertical runout lateral runout |
max.0.15 max 0.20 |
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d4 diameter = Oil seal journal
d5 diameter = Drive gear seat for intermediate shafts
d6 diameter = Oil seal journal and crankshaft pulley seat
Reconditioning Stages
| Stage | Crankcase dia. Bearing 1-8 |
All main bearings d1 and crankpins d2 on crankshaft |
Dia d3 of crank- shaft bearing Bearing 8 |
d4 journal diameter |
Diameter d5 of seat for timing gear |
Seat diameter d6 |
Width A of thrust bearing |
| Normal | Normal |
56.990-56.971 | 30.993-30.980 | 65.000-64.981 | 42.013-42.002 | 29.993-29.960 | 28.000-28.06 |
| 0.25 | 56.740-56.721 | 30.743-30.730 | |||||
| 0.50 | 56.490-56.471 | 30.493-30.480 | |||||
| 0.75 | 56.240-56.221 | 30.243-30.330 |
Crankshaft runout measured at Bearing 4 and 8, with Bearing 1 and 7 on "V"
blocks = max 0.03 mm
Machining roughness in bearing journals = 2, in oil seal journal = 2 - 6 microns
Radius r for all journals = r max 2 mm
NOTE:
After grinding, round oil passages off to 0.5 r, bevel sharp edges to 0.2 - 0.5 r. Subject
crankshaft to Tenifer treatment - 120 minutes at 570 deg C; quench in warm (40 deg C)
water. Following the Tenifer treatment, polish all bearing journals and thrust surface A;
test crankshaft for cracks. Maximum unbalance in crankshaft = 10 cmg.
Reconditioning d4 and d6 Oil Seal Journals
If journal is excessively scored, recondition (grind)
| Normal Dimensions | Undersize Dimensions | |
| Diameter d4 | 65.000-64.981 | 64.5 (-0.13 mm) |
| Diameter d6 | 29.993-29.960 | 29.5 (-0.13 mm) |
Otherwise repolish only: Machining roughness = 2 - 5 microns