Crankshaft Inspection

Crankshaft Inspection

Main Bearing, Crankshaft and Cylinder Block Removal and Installation

Crankshaft Runout

Use dial gauge to measure runout at center journal. Rotate crankshaft slowly.

Replace crankshaft if runout exceeds the limit.

Crankshaft runout
Limit: 0.02 mm (0.0007 in.)





Crankshaft Thrust Play

1) Assemble crankshaft, main bearings, thrust bearings and lower crankcase without applying sealant. Removal and Installation
2) Use dial gauge (1) to measure crankshaft thrust play (2) as shown in figure below.

Replace thrust bearing with new one (standard size or over size) to obtain standard thrust play if measured thrust play is out of standard value.

Recheck crankshaft thrust play.

Crankshaft thrust play
Standard: 0.10 - 0.35 mm (0.0039 - 0.0137 in.)






Thrust bearing thickness
Standard size: 2.470 - 2.520 mm (0.973 - 0.9921 in.)
Oversize (0.125 mm, 0.00492 in.): 2.533 - 2.583 mm (0.0998 - 0.1016 in.)

Out-of-Round and Taper (Uneven Wear) of Journal

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.

Regrind or replace crankshaft if any one of journals is badly damaged or uneven wear exceeds its limit.

Crankshaft journal outside diameter
Standard: 51.982- 52.000 mm (2.0466 - 2.0472 in)
Limit: 51.972 mm (2.0461 in.)

Crankshaft out-of-round (A - B) and taper (a - b)
Limit: 0.01 mm (0.0003 in.)