Crankshaft: Testing and Inspection

CRANKSHAFT INSPECTION




1. Measure the crankshaft end play using a dial gauge.
- If it exceeds the maximum specification, replace the crankshaft or grind the crankshaft thrust side, and install the oversize bearing so that the specified end play is obtained.

Thrust bearing thickness
STD: 2.500-2.550 mm {0.0985-0.1003 in}
OS 0.25: 2.625-2.675 mm {0.1034-0.1053 in}
OS 0.50: 2.750-2.800 mm {0.1083-0.1102 in}
OS 0.75: 2.875-2.925 mm {0.1132-0.1151 in}

Crankshaft end play
Standard 0.080-0.282 mm {0.0032-0.0111 in}
Maximum 0.30 mm {0.012 in}




2. Measure the crankshaft main journal runout on V-blocks using a dial gauge.
- If it exceeds the maximum specification, replace the crankshaft.

Crankshaft main journal maximum runout 0.10 mm {0.0039 in}




3. Inspect the main journal diameter and crank pin diameter. Measurement positions total four and they are in the X and Y directions, at two points (A and B) as shown in the figure.
- If not within the specification or exceeds the maximum off-round, replace the crankshaft or grind the journal to fit the oversize bearing.

Crankshaft main journal diameter
STD: 49.938-49.956 mm {1.9661-1.9667 in}
OS 0.25: 49.688-49.706 mm {1.9563-1.9569 in}
OS 0.50: 49.438-49.456 mm {1.9464-1.9470 in}

Crankshaft main journal maximum off-round 0.050 mm {0.0020 in}

Crank pin journal diameter
STD: 47.940-47.956 mm {1.8875-1.8880 in}
OS 0.25: 47.690-47.706 mm {1.8776-1.8781 in}
OS 0.50: 47.440-47.456 mm {1.8678-1.8683 in}

Crank pin journal maximum off-round 0.10 mm {0.0039 in}




4. Inspect the main journal oil clearance using the following procedure.
1. Install the upper main bearing and crankshaft.
2 Position a plastigauge on the journals.
3. Install the lower main bearing and the lower cylinder block. (See CYLINDER BLOCK ASSEMBLY (I).)
4. Remove the lower cylinder block. (See CYLINDER BLOCK DISASSEMBLY (II).)
5. Measure the main journal oil clearance.
- If it exceeds the maximum specification, replace the main bearing or grind the main bearing journal part and install the oversize bearing.

Crankshaft main journal oil clearance
Standard 0.019-0.038 mm {0.0008-0.0014 in}
Maximum 0.084 mm {0.0033 in}

Main bearing thickness
STD: 2.508-2.529 mm {0.09875-0.09956 in}
OS 0.25: 2.625-2.635 mm {0.1034-0.1037 in}
OS 0.50: 2.750-2.760 mm {0.1083-0.1086 in}