SsangYong Musso. Manual — part 393

1B3-134 OM600 ENGINE MECHANICAL

Machining Procedure

Valve machining is required :

- When the valve is leaking.

- When replacing the valve.

- When replacing the valve guide.

- When replacing the valve seat or valve seat ring.

1. Machine the valve seat (a=45°).

2. Measure valve seat width ‘b’.

Valve seat

width ‘b’

1.2 - 1.7 mm

1.5 - 2.0 mm

Intake

Exhaust

3. If the specification is exceeded, the valve seat width has to

be corrected at the lower free angle of ‘

β

’=65°.

4. Measure radial runout.

Runout

Max. 0.03mm

OM600 ENGINE MECHANICAL 1B3-135

38 ± 0.2mm

or 37.6 ± 0.2mm

5. Insert the valve (1) into the valve guide according to marking

and measure amount by which the valve arrears ‘a’.

Arrears ‘a’

0.1 - 0.7mm

6. Measure camshaft cam basic circle diameter (w).

Diameter ‘w’

7. Measure distance ‘z’ (cylinder head cover parting surface

- valve stem).

1B3-136 OM600 ENGINE MECHANICAL

I Length of Valve

w Camshaft Cam Basic Circle Diameter

x Distance (Camshaft basic bore - valve stem)

y Half Camshaft Basic Bore Diameter

z Distance (Cylinder head cover parting surface - .

valve stem)

8. Measure ‘x’ (Camshaft basic bore - valve stem).

‘x’ = ‘z’ - ‘y’

9. Determine the valve to be used.

(See ‘Matching valves’)

Example)

Measured value ‘w’ = 38.2 mm

Measured value ‘z’ = 36.5 mm

Value

‘y’ = 15.5 mm

‘x’ = 36.5 - 15.5 = 21.0 mm

In the case of a camshaft cam basic circle diameter
‘w’ = 38.2mm and a distance ‘x’ = 21.0mm, the installed
valve may be used.

OM600 ENGINE MECHANICAL 1B3-137

CAMSHAFT TIMING TEST

Preceding Work : Removal of glow plug

1 Cylinder Head Cover
2 Bolt . . . . . . . . . . . . . . . 10Nm
3 Gasket . . . . . . . . . . . . ... Replace

4 Valve Tappet
5 Cylinder Head

Timing

Condition of camshaft

New

After approx. 20,000km

Intake valve

Open

ATDC 11.33°

ATDC 12°

Close

ABDC 17°

ABDC 18°

Exhaust valve

Open

BBDC 28°

BBDC 27°

Close

BTDC 15.25°

BTDC 14°

"

At 2mm of valve lifting stroke.