AR05.30-S-4511A | Machine valve seat rings | 2.11.11 |
ENGINES 111.948 /978 in MODEL 638
ENGINES 111.979 in MODEL 901, 902, 903, 904
P05.30-0233-06
b Width of valve seat
α Valve seat angle
β Top correction angle
γ Bottom correction angle
S01.40-3008-06
1 Exhaust valve
2 Intake valve
H Height of cylinder head
T Distance from the valve stem end to the base of the camshaft bearing
| Remove/install | ||
1 | Remove valves | ||
2 | Machine valve seats | Pay attention to operating instructions from the tool manufacturer; observe dimensions according to test and adjustment values. | |
Cylinder head clamping device (cylinder head holding fixture) | |||
Valve seat turning device | |||
Testing kit for valve seats | |||
Cutting tools for valve seat and correction angle (α) and (β) | |||
3 | Measure valve seat width | Correct valve seat width if necessary (angle αβ). | |
4 | Measure distance from valve stem end to base of camshaft bearing (reference dimension T) | ||
Insert round material into the camshaft bearing base for this step and measure dimension "T". If measurement is less than dimension "T", no correct valve clearance compensation is possible; replace valve seat ring or cylinder head. | |||
If measurement is less than minimum dimension, no correct valve clearance compensation is possible. | |||
Fit new valve seat rings. | |||
5 | Install in the reverse order |
Check values for valves
Number | Designation | Engine 111.948/978/979 | ||
BE05.30-N-1001-01A | Distance from valve stem end to camshaft bearing base (inspection dimension "T") in the case of dia. standard size camshaft | Inlet | 24.73-25.95 | |
Outlet | 22.73-23.95 | |||
Test values for valve seat rings