Valve Guide: Service and Repair

COMPONENT NOTES AND INFORMATION

NOTE: Always replace all seals and gaskets.

1 Bearing cap
- Installation position, refer to Replacement. Service and Repair
2 Torque to: 17 Nm (13 ft. lbs.)
3 Camshaft
- Removing and installing, refer to Replacement. Service and Repair
- Checking axial clearance, refer to Procedures. Testing and Inspection
- Maximum allowable play: 0.01 mm (0.0004 inch)
4 Valve stem oil seal
- Always replace
- Changed from earlier version
- Replacing, refer to Replacement. Service and Repair
5 Cylinder head
- Resurfacing cylinder head, refer to Resurfacing
- Refacing valve seats, refer to Refacing. Service and Repair
6 Oil seal
- Always replace
- Replacing, refer to Replacement. Service and Repair
- Toothed camshaft drive belt, removing and installing, refer to Replacement. Service and Repair
7 Exhaust valve
- Changed from earlier version
- Stem diameter 7 mm (0.27 inch)
- Checking, refer to Procedures. [1][2]Testing and Inspection
- Checking and replacing valve guides, refer to Testing and Inspection or Service and Repair as required. Valve Guide
8 Hydraulic valve lifter Oil contact surfaces before installing
- Store with cam lobe contact surface facing downward
- Checking, refer to Procedures. Testing and Inspection
9 Intake valve
- Changed from earlier version
- Checking and refacing, refer to Testing and Inspection or Service and Repair as required. Valve
- Checking and replacing valve guides, refer to Testing and Inspection or Service and Repair as required. Valve Guide

PROCEDURE

CAUTION: Cylinder heads with valve seats that can no longer be refaced, or which have already been machined to the minimum dimension, can no longer be repaired.





- Press out worn valve guides from camshaft side using drift 10-206.
Replacement guides with shoulder must be pressed out from combustion chamber side.
- Coat new guides with oil and, using drift 10-206, press new guide into cold cylinder head from camshaft side until shoulder makes contact.

CAUTION: When the shoulder on the new guide makes contact, the pressing force must not exceed 1.0 ton or the guide shoulder could break off.

- Ream new valve guides to size with appropriate size hand reamer, using plenty of cutting fluid.
7 mm valve stems: use hand reamer 3120
8 mm valve stems: use hand reamer 10-215
- Reface valve seats after replacing valve guides. Observe minimum dimensions.