SSANGYONG 1999 Musso Service Manual page 481

Measurement Procedure
1. Measure height 'A'.
Limit
Notice
If the height is less than 142.5mm, replace the cylinder head.
2. Insert the valve (1) and measure valve arrears 'a'.
Valve Arrears 'a'
Notice
If out of standard, machine the valve seat.
3. Install the prechamber and measure protrusion 'C'.
Protrusion 'C'
4. Assemble the engine and check the valve timing.
OM600 ENGINE MECHANICAL 1B3-179
142.5 mm
0.1 - 0.7 mm
7.6 - 8.1mm