Sidekick JSS 4D Hard Top 2WD L4-1.8L (1997)
Crankshaft Main Bearing: Testing and Inspection
MAIN BEARINGS
General Information:
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Service main bearings are available in standard size and 0.25 mm (0.0098 inch) undersize, and standard size has 5 kinds of bearings differing in
tolerance. To distinguish undersize bearing, it is painted red at the position as indicated in figure. Undersize bearing thickness is 2.124-2.128 mm
(0.0836-0.0337 inch) at the center of bearing.
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Upper half of bearing has oil groove as shown in figure. Install this half with oil groove to cylinder block.
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Lower half of bearing does not have oil groove.
Inspect
Check bearings for pitting, scratches, wear or damage. If any malcondition is found, replace both upper and lower halves. Never replace either half
without replacing the other half.
Main Bearing Clearance
Check clearance by using gaging plastic according to following procedure.
1. Remove lower crankcase.
2. Clean bearings and main journals.
3. Place a piece of gaging plastic the full width of bearing (parallel to crankshaft) on journal, avoiding oil hole.