223 / 1588
78
486 PL ENGINE
P
VALVE
Valve seat insert & bore dia in cylinder head
Stage
Valve seat
Valve seat
insert bore in insert out
cylinder head side diameter
mm
mm
INLET
Normal
33.6/33.625
33.6+0.128
+0.112
EXHAUST
Normal
30.000/30.021 30.05+0.105
0.080
Depth of bore Thickness of
in cylinder
valve seat
head for valve
insert
seat insert
mm
mm
INLET
6+0.1
6.0
EXHAUST
6+0.1
6.0
Lubrication system
Oil Pump Pressure Relief Valve :
Opening pressure
7 ± 0.5 bar
Flow rate measured against back pressure of
3 kg/cm
2
should be as follows using SAE-30 oil.
Pump rpm Minimum flow rate in lpm
3725
46.5
2855
35.5
1800
22.5
800
9.3
Engine oil pressure with coolant temperature of
70
0
C at idling speed
800+50rpm/1.2
bar
at 4500rpm/3 bar
PUMP TO BE LEAK TESTED AT : 8 bar.
Oil Pressure Switch
NC contact opening pressure 0.9/0.6 bar
Cooling system
Radiator : TATA TOYO
Type
: McCORD type
aluminium brazed
2rows
Number of tubes
: 54 (in single row)
Number of tube rows
: 2
Core
Height
: 485
mm
Width
: 537.2 mm
Thick
: 48
mm
Core Capacity
: 4.3 litres (approx.)
Leakage testing pressure : 1.5
bar
Radiator Cap :
Pressure valve opening : 1.0±0.1 kg/cm
2
Vacuum valve opening : < 0.05 kg/cm
2
(suction)
(max)
Thermostat :
Start opening temperature 83
0
± 2
0
C at 0.1mm
Full open temperature
95
0
± 2
0
C at 8.0mm
valve travel
By pass port closed at or
93
0
C
before
Leakage through main valve 180 to 250Lit/hr.
(including seepage hole)
at room temperature
and pressure of 1 kg/cm
2
Maximum leakage
1.5 lpm (Max)
through by-pass at full
open temperature or main
flow rate of 130
±5
lpm
Water Pump Characteristics :
Water pump flow rate at back pressure of 0.1 to
0.8 bar
Pump rpm Minimum flow rate in lpm
2000
59
3000
88
4000
121
4500
165