Toyota Workshop Service and Repair Manuals

Piston Ring: Specifications

Piston Groove Clearance 

Ring groove clearance:
No.1 ...................................................................................................................................................................  0.02 to 0.07 mm (0.0008 to 0.0028 inch)
No.2 ...................................................................................................................................................................  0.02 to 0.06 mm (0.0008 to 0.0024 inch)
Oil .....................................................................................................................................................................  0.07 to 0.15 mm (0.0028 to 0.0060 inch) 

Piston Ring End Gap 

Using a piston, push the piston ring a little beyond the bottom of the ring travel, 110 mm (4.33 inch) from the top of the cylinder block.
Standard end gap:
No.1 ..................................................................................................................................................................  0.30 to 0.40 mm (0.0118 to 0.0157 inch) 
No.2 ..................................................................................................................................................................  0.40 to 0.50 mm (0.0157 to 0.0197 inch) 
Oil (Side rail) ....................................................................................................................................................  0.10 to 0.40 mm (0.0039 to 0.0157 inch) 
Maximum end gap:
No.1 ..................................................................................................................................................................................................  1.0 mm (0.039 inch) 
No.2 ..................................................................................................................................................................................................  1.1 mm (0.043 inch) 
Oil (Side rail) ....................................................................................................................................................................................  1.0 mm (0.039 inch)