Valve Seals

Replacement (D 15137, D 15138 engine)

The procedure shown below is used when using the incar valve spring compressor (Snap-on YA8845 with YA8845-2A 7/8" attachment, intake=long, exhaust = short).

AWARNING Always use approved eye protection when using the in-car valve spring compressor.

1. Turn the crankshaft so that the No. 1 and the No. 4 piston are at TDC.

2. Remove the cylinder head cover and the rocker arms (page 6-31).

NOTE: When removing or installing the rocker arm assembly, do not remove the cam holder bolts. The bolts will keep the holders, spring and rocker arms on the shaft.

3. Remove the fuel injectors and the wire harness.

4. Using the 8 mm bolts supplied with the tool, mount the two uprights to the cylinder head at the end cam holder locations. The uprights fit over the camshaft as shown. Install the both on the B (exhaust) side of the tool.

5. Insert the cross shaft through top holes of the uprights.

Intake valve seal:

6. Select the 7/8 in. diameter long compressor attachment and fasten the attachment to the No. 4 hole of the lever arm with the speed pin supplied.

7. Position the piston at TDC and insert an air adaptor into the spark plug hole. Pump air into the cylinder to keep the valve closed while compressing springs and removing the valve keepers.

8. Position the lever arm under the cross shaft so the lever is perpendicular to the shaft and the compressor attachment rests on top of the retainer for the spring being compressed. Use the front position slot on the lever as shown.

CAUTION: Use caution when removing or installing the valve keepers to prevent the keepers from falling into the oil passages. A shop rag can easily be placed over these passages.