Inspect Clearance Between Wall Of Ring Groove And New Piston Ring; Inspect Piston Ring End Cap - Toyota 1PZ Repair Manual

EM-98
ENGINE MECHANICAL - Cylinder Block
(b) Measure the cylinder bore diameter in the thrust
directions. (See step 5 on page EM-93)
(c) Subtract the piston diameter measurement from the
cylinder bore diameter measurement.
Standard oil clearance:
Maximum oil clearance: 0.14 mm (0.0055 in.)
If the oil clearance is greater than maximum, replace all five
(1 PZ) or six (1 HZ and 1 HD-T) pistons and rebore all five
(1 PZ) or six (1 HZ and 1HD-T) cylinders. If necessary,
replace the cylinder block.
HINT (Use cylinder block subassembly): When installing
a standard piston, install one with the same number mark as
the standard bore diameter mark on the cylinder block.
3. INSPECT CLEARANCE BETWEEN WALL OF RING
GROOVE AND NEW PISTON RING
(No.1 Ring)
Install new No.1 piston ring to the piston. Using a thickness
gauge, measure the clearance between the piston ring and
wall of the piston ring groove.
Ring groove clearance:
No.1 0.050-0.095 mm (0.0020-0.0037 in.)
(No.2 and Oil Rings)
Using a thickness gauge, measure the clearance between
new piston ring and the wall of the piston ring groove.
Ring groove clearance:
No.2 0.06-0.10 mm (0.0024-0.0039 in.)
Oil
If the clearance is not as specified, replace the piston.
4.

INSPECT PISTON RING END CAP

(a) Insert the piston ring into the cylinderbore.
(b) Using a piston, push the piston ring a little beyond the
bottom of the ring travel, 1 50 mm (5.91 in.) from the
top of the cylinder block.
0.04-0.06 mm
(0.0016-0.0024 in.)
0.03-0.07 mm (0.0012-0.0028 in.)