Cylinder Boring - Toyota 1HD-FT Repair Manual

EG-BO
ENGINE - ENGINE MECHANICAL --
CYLINDER BORING
EG
-
Sized Mark
Front Mark
(Arrow)
39.06 mm
HINT:
• Bore all the 6 cylinders to the oversized piston
outside diameter.
• Replace all the piston rings with ones to match
the oversized pistons.
1. KEEP OVERSIZED PISTDNS
Over.ized piston diametar:
O/S 0.50
94.345 - 94.375 mm (3.7U4 - 3.7155 in.)
2. CALCULATE AMOUNT TO BORE CYLINDERS
(a) Using a micrometer. measure the piston diameter at
right angles to the piston pin center line. 39.06 mm
(1.5378 in.) from the piston head.
(b) Calculate the amount each cylinder is to be raborad as
follows:
Size to b. ,.bored = P
+
C - H
P = Pi.ton diemeter
C = Piston cle.rence
0.145 - 0.165
mm
(0.0057 - 0.0065 in.1
H = Allowance for honing
0.02 mm (0.0008 in.) or I•••
3. BORE AND HONE CYLINDER TO CALCULATED
DIMENSIONS
Maximum honing:
0.02 mm (0.0008 in.)
NOTICE: Exc••• honing will d••troy the fini.h.d round-
n••••