Exhaust valves
Inlet valves
Valve locations:
- A - engine M123
- B - M110 engine
Adjusting valve clearances on the M 123 engine
1. Remove the block head cover and turn out the spark plugs.
2. Turning the crankshaft pulley, set the piston of the first cylinder to TDC so that the intake valve is closed (the top of the lobe is pointing up).
3. A set of probes (see table) check the gap between the back of the cam and the back of the lever. If the gap is normal, then the probe should enter with a slight pinch. If not, loosen the lock nut and turn the adjusting bolt with a wrench until the clearance is correct. After adjustment, tighten the bolt locknut.
4. If the adjusting bolt fails to achieve the required clearance, you can replace the push knob on the valve stem.
5. Repeat this operation on the remaining inlet valves in the sequence 1—5—3—6—2—4; then adjust the exhaust valves in the same way.
6. Pay special attention to the location of the valves.
Valve clearance, mm | M 123 | M 110 | ||
cold | hot | cold | hot | |
inlet | 0,10 | 0,15 | 0,10 | 0,15 |
graduation | 0,20 | 0,25 | 0,25 | 0,30 |