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Home >> Isuzu >> 1985 >> Impulse 2.0 F, Standard >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> 1.8L 4-CYL - VIN [B], 1.9L 4-CYL [A], 2.0L 4-CYL [F] >> Overhaul >> Crankshaft Main Bearings

Crankshaft Main Bearings

  1. Use Plastigage method to check main bearing clearances. If clearances are excessive, install undersize bearings. Replacement bearings are available in standard, .010" (.25 mm) undersize and .020" (.50 mm) undersize.
  2. With crankshaft removed from engine, measure diameter of crankshaft journals and crankpins at front, rear and in 2 directions to check for wear and taper. If taper exceeds .002" (.05 mm), replace or correct crankshaft.
  3. Check crankshaft runout by placing "V" blocks under crankshaft at No. 1 and No. 5 journals. Position dial indicator point on No. 3 journal. Slowly turn crankshaft, while noting runout. If runout exceeds .004" (0.1 mm), replace or correct crankshaft. Standard runout is .001" (.03 mm).
  4. Lubricate engine bearings. Install main bearing caps with arrow pointing toward front of engine. Tighten caps gradually and in following sequence: 3, 4, 2, 5, and 1. Ensure that crankshaft turns freely.
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