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Home >> Isuzu >> 1988 >> Trooper II Base, Automatic >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> 2.3L 4-CYL - VIN [L] & 2.6L 4-CYL - VIN [E] >> Overhaul >> Crankshaft Main Bearings Service

Crankshaft Main Bearings Service

  1. Use Plastigage method to check main bearing clearances. If clearances are exceeded, install undersize bearings. Replacement bearings are available in standard, .010" (.25 mm) and .020" (.50 mm) undersizes.
  2. Remove crankshaft from engine. Measure crankshaft journals and crankpins 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" (.10 mm), replace or correct crankshaft. Standard runout is .001" (.03 mm) or less.
  4. Lubricate engine bearings. Install main bearing caps with arrow pointing toward front of engine. Tighten caps gradually and in sequence of caps No. 3, No. 2, No. 4, No. 1 and No. 5. Tighten caps to specification. Ensure that crankshaft turns freely.
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