Valve Spring: Testing and Inspection

Checking and adjusting installation length of valve springs

Note: When selecting the valve spring seat (own construction) always ensure that the valve spring seat is 2.0 + 0.2 mm thick.





Tool (own construction)

Valve spring Sp No.944.105.467.03

Auxiliary spring Sp No.928.107.171.01

1. Machine a recess of approx. 10 mm width into valve-spring seat. Only install valve- spring seat for measurement.

2. Shorten the auxiliary spring to approx. 50 mm to ease assembly.





3. Install valve and hold in valve seat. Insert washer, valve-spring seat, auxiliary spring and valve-spring seat with machined recess.


4. Use Special Tool 9242 to fit the conical valve keepers.

5. Using a depth gauge, measure from the top surface of the valve-spring seat, vertically downwards through the recess to the outer spring contact surface.





Installation length
Inlet valve 38.0 + 0.5 mm
Exhaust valve 37.0 + 0.5 mm

6. The installation length can be adjusted using shims.

7. The valves must not be mixed up again after measurement.