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Home >> Isuzu >> 1983 >> Impulse Standard >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> 1.8L 4-CYL - VIN [B],1.9L [A], 1.95L 4-CYL - VIN [A] >> Engine Identification >> Crankshaft Main Bearings

Crankshaft Main Bearings

NOTE: To check bearing clearances, remove engine from vehicle. Following procedures are performed with oil pan removed, and oil film removed from surfaces to be checked.
  1. Check main bearing clearances using Plastigage method. If clearances are excessive, install undersize bearings. Replacement bearings are available in standard, .010" (.25 mm) undersize and .020" (.50 mm) undersize.
  2. To check crankshaft runout, place "V" blocks under crankshaft at No. 1 and No. 5 journals. Position dial indicator point on No. 3 journal.
  3. Slowly turn crankshaft at least 1 full revolution, while recording runout. If runout exceeds .0038" (.097 mm), replace or correct crankshaft. Standard runout is .001" (.03 mm).
  4. Check taper and out-of-round for main bearing and connecting rod journals. Maximum taper and out-of-round for Impulse is .002" (.05 mm). Maximum taper and out-of-round for I-Mark and P'UP is .003" (.07 mm).
  5. Install main caps so arrow on rear face of cap is turned to front of engine. Bearings should be well lubricated prior to installation. Tighten caps in progressive steps, in sequence of 3, 4, 2, 5, and 1.
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