Toyota 1HD-FT Repair Manual page 89

EG-76
ENGINE - ENGINE MECHANICAL
Piston
Cylinder Block
(b) Measure the cylinder bore diameter in the thrust di-
rections. (See step 4 in cylinder block inspection)
(c) Subtract the piston diameter measurement from the
cylinder bore diameter measurement.
Standard oil cla.rance:
0.145 - 0.185
mm
(0.0057 - 0.0065
in.)
Maximum oil cle.rance:
0.215
mm
(0.0085
in.)
If the oil clearance is greater than maximum. replace
all the 6 pistons and rebore all the 6 cylinders. If
necessary. replace the cylinder block.
HINT (Use new cylinder block): Use a piston with the
same number mark as the cylinder bore diameter
marked on the cylinder block.
Mark
,..---::"...----,. 2 or 3
-....,.~
Front
Mark
(Arrow)
''''''
No.1 Ring
No.2 and Oil Ring
B. Inspect piston ring groove clearance
No.1 Ring:
Install a new piston ring to the piston. Using a feeler
gauge, measure the clearance between the piston ring
and the wall of the ring groove.
Standud groo..... clearanc.:
0.050 - 0.095 mm (0.0020 - 0.0037
in.)
Maximum groove cl••rance:
0.20 mm (0.0079
in.)
If the clearance is greater than maximum. replace the
piston.
No.2 and Oil Rings:
Using a feeler gauge, measure the clearance between
a new piston ring and the wall of the ring groove.
Standard groo..... clearanc.:
No.2
0.060 - 0.100 mm (0.0024 - 0.0039
in.)
Oil
0.030 - 0.070 mm (0.0012 - 0.0028
in.)
Maximum groo..... cl.aranc.:
0.020 mm (0.0079
in.)
If the clearance is greater than maximum. replace the
piston.
C. Inspect piston ring end gap
(a) Insert the piston ring into the cylinder bore.
(b) Using a piston, push the piston ring a little beyond the
bottom of the ring travel. 130 mm (5.12 in.) from the
top of the cylinder block.