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CYLINDER BLOCK — Assembly (Cont'd) Crankshaft (Supplement-V)

EM-5044prose procedure

Main bearing cap bolts use a two-stage process: 20 N·m preliminary in order shown (NEM306 — cross pattern from centre outward) + 50° angular tightening. Matches the disassembly loosening pattern documented on EM-5036 (NEM295) but in reverse.

Continued from EM-5043

Assembly (Cont'd)

CRANKSHAFT

Crankshaft assembly

  1. 1
    Set main bearings in their proper positions on cylinder block and main bearing cap.
    Confirm that correct main bearings are used. Refer to "Inspection" (EM-5040).
    No. 2 and No. 4 main bearing halfshells have an oil groove.
    The oil grooves of the thrust bearing should face the crankshaft.
    Exploded view of main bearing positions in the cylinder block (re-used from EM-5038): upper bank shows thrust bearing (upper only), upper bearings with oil grooves, with 'No.1 bearing (flywheel side)' callout and a 'Front' arrow. Lower bank shows the lower bearings without oil grooves seated in the main bearing caps.
    NEM297
  2. 2
    Install crankshaft and main bearing caps and tighten bolts as follows:
    Main bearing cap bolts:
    (1) Tighten to 20 N·m (2.0 kg-m, 14.8 ft-lb) in order shown.
    (2) Turn bolts to 50° degrees clockwise with an angle wrench in order shown.
    After securing bearing cap bolts, make sure crankshaft turns smoothly by hand.
    Top view of the cylinder block / main saddle showing 10 main-bearing-cap bolts numbered 1-10 in the recommended TIGHTENING order (cross / spiral pattern from centre outward — reverse of the loosening order on EM-5036). Bolts roughly: centre pair 1,2; next ring 3,4,5,6; outer 7,8; end pair 9,10.
    NEM306
  3. 3
    Measure crankshaft end play.
    Crankshaft end play:
    Standard: 0.07 - 0.27 mm (0.0024 - 0.0102 in)
    If beyond the standard clearance, replace thrust bearing with a new one.
    Dial indicator mounted on the cylinder block with its probe touching the crankshaft to measure end play axially — illustrates step 3 (measure crankshaft end play).
    UEM097
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See also

EM-5040 — Inspection (main bearing halfshell selection)

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