Procedures
WM 157049 Machining the cylinder headPreliminary work
Preliminary work for machining cylinder head
1. Remove cylinder head.
2. Disassemble cylinder head.
Machining the cylinder head
Machining the cylinder head
Caution:
Use solvent naphtha or acetone to clean/degrease components.
- Harmful to skin and eyes.
--> Always observe the manufacturer's specifications.
--> Wear appropriate (petrol-resistant) protective gear, such as apron, gloves and goggles.
1. Carefully clean sealing face using solvent naphtha or acetone.
2. Measure cylinder head height on a level surface (surface plate recommended).
Standard dimension -X- : 142.0 ± 0.05 mm
Cylinder head height
3. Check combustion chamber sealing face of the cylinder head for distortion (flatness) using a straight-edge and feeler gauge.
Permissible unevenness of parting surface for used cylinder head: 0.05 mm
Flatness of sealing face of cylinder head (diagonal)
Flatness of cylinder head (longitudinal)
4. Cylinder heads with a distorted or grooved sealing face can be repaired by surface-milling them. The following machining criteria must be observed:
Permissible unevenness after machining: 0.03 mm
Permissible roughness profile (can be measured with contact stylus procedure): 15pt14
Permissible surface depth from standard dimension: 0.15 ± 0.05 mm
Subsequent work
Subsequent work for machining cylinder head
1. Assemble cylinder head.
2. Install cylinder head.