AR01.30-P-7162GS | Check/face-grind cylinder head contact surfaces | 10.11.11 |
ENGINES 111.951
ENGINES 111.955
ENGINES 111.958
ENGINES 111.983
P01.30-0232-06
| Remove/install | ||
1 | Remove valves | Engines 111.958/983/951/955 | |
2 | Inspect flatness of cylinder head in longitudinal direction | Straightedge | |
3 | Measure height of cylinder head (inspection dimension H) and note | ||
4 | Face contact surface of cylinder head | Only machine cylinder head contact surface if porous or damaged points are present or if an impermissible variation of the flatness in the longitudinal direction is measured. The stock removal at the cylinder head and at the crankcase of an engine must together be not more than 0.4 mm. | |
The top cylinder head contact surface must not be machined otherwise the basic bores of the camshaft bearings will be altered. If cracks are suspected (internal loss of coolant), pressure-test cylinder head. | |||
Old stock - surface grinding machine (cylinder head) gotis://A_01_14.0 | |||
5 | Once again measure height of cylinder head (inspection dimension (H)) | Measure stock removal. | |
6 | Insert valves (42, 43) | ||
7 | Measure inspection dimension (T) between end of valve stem and base of camshaft bearing and note | To do this, insert dia. 6 mm round bar into the middle of the base of the camshaft bearing and measure dimension (T) with caliper gage. | |
If the measurement obtained is less than the dimension (T), no further correct valve clearance compensation exists. Remedy: Replace valve seat ring or cylinder head. | |||
For camshaft dia. standard size | |||
for camshaft dia. repair stage | |||
8 | Re-work valve seats to match stock removal at cylinder head | Engines 111.958/983/951/955 | |
9 | Install in the reverse order |
Cylinder head/cylinder head bolts
Number | Designation | Engine | ||
BE01.30-P-1002-04B | Cylinder head | Overall height "H" mm | mm | 135.9 to 136.0 |
Height | mm | 135.5 | ||
See picture | ||||
BE01.30-P-1003-04B | Cylinder head | permissible difference of flatness of contact surface in a longitudinal direction | mm | 0.08 |
permissible difference of flatness of contact surface in a transverse direction | mm | 0 | ||
Peak-to-valley height | μm | 3/10 | ||
Check values for valves
Number | Designation | Engine 111 | ||
BE05.30-P-1001-01A | Distance from end of valve stem to base of camshaft bearing (inspection dimension" T") for standard size camshaft dia. | Inlet | 25.18-25.70 | |
Outlet | 23.18-23.70 | |||
See picture | ||||
BE05.30-P-1002-01A | Distance from end of valve stem to base of camshaft bearing (inspection dimension" T") for camshaft dia. repair | Inlet | 24.93-25.45 | |
Outlet | 22.93-23.45 | |||
See picture | ||||