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CYLINDER BLOCK — Connecting Rod Bearings; Small-End Clearance; Determining the Piston Type (Supplement-V)

EM-5041prose procedure

Source step 1 of 'Determining the piston type' uses the spelling 'main bearings caps' (matching the same source-side spelling preserved on EM-5036).

Continued from EM-5040

Inspection (Cont'd)

Connecting rod bearing (Big end) — clearance (continued)

  1. 4
    Measure outer diameter of each crankshaft pin journal.
    Hand using a micrometer to measure the outer diameter of a crankshaft pin journal — illustrates Inspection step 4 (measure conrod-pin journal OD).
    SEM506A
  2. 5
    Calculate connecting rod bearing clearance. Connecting rod bearing clearance = Inner dia. − Outer dia.
    Standard: 0.010 - 0.044 mm (0.0004 - 0.0017 in)
  3. 6
    If it exceeds the standard clearance, replace bearing.
  4. 7
    If clearance cannot be adjusted with the standard bearing, grind crankshaft journal and use undersized bearing. Refer to step 7 of "BEARING CLEARANCE − Main bearing".

Connecting rod bearing thickness

Standard
Thickness1.814 - 1.820 (0.071 - 0.072)
Undersize
Thickness1.964 - 1.970 (0.077 - 0.078)

Connecting rod clearance (Small end)

  1. 1
    Measure inner diameter of connecting rod small end.
    Standard: 23.007 - 23.02 mm (0.9058 - 0.9063 in)
    Connecting rod held with a dial bore gauge in the small-end bore — illustrates Connecting rod clearance (Small end) step 1 (measure small-end inner diameter).
    SEM151B
  2. 2
    Measure outer diameter of piston pin.
    Standard: 22.996 - 23.000 mm (0.9054 - 0.9055 in)
    Hands using a micrometer to measure the outer diameter of a piston pin — illustrates Connecting rod clearance (Small end) step 2 (measure piston pin OD).
    SEM903A
  3. 3
    Calculate connecting rod bushing clearance. Connecting rod bushing clearance = Inner diameter − pin outer diameter. If it exceeds the standard clearance, replace connecting rod assembly and/or piston and pin.
    Standard: 0.011 - 0.02 mm (0.0004 - 0.0008 in)

DETERMINING THE PISTON TYPE

Determining the piston type

  1. 1
    Install crankshaft with correct bearings and tighten main bearings caps to the specified torque.
  2. 2
    Mount the No. 4 cylinder connecting rod on the calibration piston SST KV109B0050.
    Calibration piston SST KV109B0050 with a connecting rod attached, installed in the No. 4 cylinder bore of the cylinder block — illustrates Determining the piston type steps 1-4.
    NEM300
  3. 3
    Install a new pair of connecting rod bearings.
  4. 4
    Install the calibration piston with connecting rod in the corresponding cylinder.
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See also

EM-5039 — BEARING CLEARANCE Main bearing step 7 (undersize grinding)

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