To Prepare The Cylinder Head; Grind The Valve Seats; Grinding In The Valves - CITROËN ID 19 Repair Manual

40
OPERATION No. ID 100-3 :
To overhaul the engine
ID 19
ASSEMBLY
To prepare the cylinder head (see Pl. 4):
4
Grind the cylinder head:
A distortion of 0.05 mm is tolerated during manufacture.
Moderate grinding of the joint face is allowed. The original thickness of the cylinder head must not be reduced
by more than 0.3 mm.
If it is suspected that the cylinder has already been ground, measure dimension "c" (see fig.6). This dimension;
t 0.1
"c" must be 26.5 -' o 2mm.
b)
Grind the valves (Black & Decker type valve grinder).
NOTE
- The valve face angles are:
Exhaust valves 90°
Inlet valves 120'
Round corners of the valve heads at "a" and "b" (see P1.4 fig. 3).
The radius of curvature should be
about 0.5 mm.
4
Grind the valve seats:
NOTE - The width "1 I' of the seat must be between 0.9 and 1.5 mm.
Use the following grinding wheels to obtain
these dimensions:
Inlet valve seat:
For the valve seat face.. . . . . . . . . . . . 120° biconical wheel . . . . . . . . . . . . . . . 1662-T
For top clearance . . . . . . . . . . . . . . . . . 150' biconical wheel . . . . . . . . , . . . . . . 1630-T
For bottom clearance . . . . . . . . . . . . . .
90° biconical wheel . . . . . . . . . . . . . . . 1630-T
Exhaust valve seat:
For the face . . . . . . . . . . . . . . . . . . . . . . 90' biconical wheel . . . . . . . . . . . . . . . 1627-T
For top clearance . . . . . . . . . . . . . . . . . 150° biconical wheel . . . . . . . . . . . . . . . 1627-T
For bottom clearance . . . . . . . . . . . . . . 60~ wheel.. . . . . . . . . . . . . . . . . . . . . . . 1633-T
It is essential that the large diameter of the seat face should be equal to the greatest diameter of the valve
d)
e)
f 1
(see figs.land2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Grinding in the valves (suction valve grinder 1615-T, see fig.4) driven by an electric, pneumatic or hand
operatedgrinder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Clean the cylinder head carefully in order to remove all traces of Carborundum from the valve chambers
and gas passages.
Calibrate the springs (spring calibrator 2420-T, see Pl.6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TOOLS
Wheels :itgIT
1627-T
1633-T
Valve grinding tool
1615-T
Spring calibrator 2420-T