Remove
Piston with con-rod - see operation "Piston with Con-rod Remove and Install".
Piston rings from piston - use commercially available piston ring clamp pliers.
Clean
Piston ring grooves - use ground piece of old piston ring.
Measure
Piston ring gap at a position where cylinder bore diameter is smallest.
If ring gap exceeds 1.5 mm replace piston ring.
For piston ring sizes permissible piston ring gaps – see 'Technical Data'.
Measure
Clearance between piston ring grooves and rings.
If clearance exceeds 0.15 mm replace piston ring – see also 'Technical Data'.
Install
Oil ring (1) with expander ring to piston – install expander coil into oil ring so there is no gap on either end of the coil.
Compression rings (2 and 3) to piston – stamped side to face up; on 4JG2T engine:
- 2nd compression ring (2) with 2N mark facing up.
- 1st compression ring (3) with 1N mark facing up.
Apply clean engine oil to circumference of piston rings.
Inspect
Rings for smooth rotation.
Adjust
Ring gap positions as shown:
- Oil ring (1).
- 2nd compression ring (2).
- 1st compression ring (3).
Mark on piston (arrowed) must face front of engine. Illustration shows 4JA1T piston.
Install
Piston with con-rod to engine.
