Valve: Service and Repair

Remove/Install Valves

Shown On Engine 111:

Remove/Install
1 Remove cylinder head (87)
2 Remove camshafts
3 Place cylinder head (87) onto assembly board (24)

NOTE: Place correct side of insert (25) into assembly board (24) with the direction of travel arrow (26) facing forward. Attach cylinder head (87) to assembly board (24) with a cylinder head bolt (23) at the front and rear, with front of cylinder head pointing toward direction of travel arrow (26).

4 Bolt on support bridge (2) with slide (7)

NOTE: Screw support bridge (2) onto camshaft bearings 1+5 and 6+10, for this step use collar bolts for camshaft bearing caps.

5.1 Remove hydraulic valve clearance compensation elements (3) (bucket tappets)
- Engine 111

5.2 Remove hydraulic valve clearance compensation elements
- Engine 271

6 Attach lever compression tool (9) with thrust piece (5) into collapsible section (7) and align.
- Position thrust piece (5) vertically at valve spring retainer (15) and align parallel to slide (7).
- Fix thrust piece (5) in place with screw (8) to prevent it turning.

7 Remove upper valve spring plate (15) and valve spring (17)

NOTE: Press together valve spring (17)

- Take out split valve spring retainer locks (14) with tweezers (6).

NOTE: The valve springs of the inlet valves and exhaust valves are identical.

8 Replace valve stem seals
9 Remove lower valve spring plate (20)

Testing
10 Inspect top and bottom valve spring retainers (15 and 20)
- Check valve spring retainers for signs of scoring replace if necessary.

DANGER:
- Risk of explosion and poisoning. The melting down or improper handling of sodium-filled valves may result in explosion or poisoning. Risk of injury. Skin contact with sodium may result in heat or chemical burns.
- Do not open sodium-filled valves. Wear protective gloves and safety glasses when handling damaged valves.

11 Unbolt cylinder head (87) from assembly board (24), remove valves

NOTE: Inspect surface of valve stems for roughness and formation of burrs (visual inspection or check with nail).

- Replace valves with rough stem surface or burrs.

12 Install in the reverse order.