General Procedures - Piston Protrusion Check

Special Service Tools / General Equipment

Dial indicator

Check

1. 1
   Make sure the cylinder block deck surface and the pistons are clean.
2. 2
   Measure piston protrusion in a straight line front to back, avoiding raised or etched marks.

   

3. 3
   • Using a dial indicator and a commercially available deck bridge, position the bridge on the cylinder block deck surface at one of the cylinders.
     Use common equipment: dial indicator

   • Zero the dial indicator on the cylinder block deck surface.

   

4. 4

   NOTICE: Rotate the crankshaft clockwise only.

   NOTICE: The piston must remain at TDC, otherwise the readings will be inconsistent.

   • Position the dial indicator and the commercially available bridge over the piston.
     Use common equipment: dial indicator

   • Rotate the crankshaft until the piston is at TDC.
     Use common equipment: dial indicator

   • Record the reading.

   

5. 5
   • Move the dial indicator and the commercially available deck bridge to the opposite position on the cylinder block deck surface.
     Use common equipment: dial indicator

   • Zero the dial indicator on the cylinder block deck surface.

   

6. 6
   • Move the dial indicator and the commercially available deck bridge to the opposite position on the piston.
     Use common equipment: dial indicator

   • Record the reading.

   

7. 7
   Average the readings and record.
8. 8
   Repeat on the remaining pistons.
9. 9
   Determine the cylinder head gasket thickness.