Sidekick JSS 4D Hard Top 2WD L4-1.8L (1997)
Out-of Round And Taper (Uneven Wear) Of Journals
An unevenly worn crankshaft journal shows up as a difference in diameter at a cross section or along its length (or both). This difference, if any, is
determined by taking micrometer readings. If any one of journals is badly damaged or if amount of uneven wear in the sense explained above exceeds
its limit, regrind or replace crankshaft.
Diameter of journal: 57.982 - 58.000 mm (2.2828 - 2.2834 inch)
Limit On Out-of-Round And Taper: 0.01 mm 10.0004 inch).
Out-of-Round: A - B
Taper: a - b
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.
