Replacing Valve Guides

Replacing valve guides (24, Fig. 3B-1) if necessary, must be done before valve seat and face are ground since the valve stem hole in valve guide is the basis from which all face and seat grinding is done.

Figure following name of part indicates quantity necessary for one complete assembly.

1. Spring cap retainer (2)

2. Head bolt and washer (5)

5. Cylinder head

6. Cylinder head gasket

7. Cover reinforcing screw (12)

8. Cover reinforcing ring

9. Rocker arm cover

10. Cover pad

11. Cover gasket

12. Rocker arm bearing stud nut (8)

13. Intake valve oiler

14. Rocker arm bearing top half (2)

16. Rocker arm bearing bottom half (2)

17. Exhaust valve stem pad (FL model only)

19. Upper valve spring collar (2)

20. Outer valve spring (2)

21. Inner valve spring (2)

22. Lower spring collar (2)

23. Valve (one exhaust, one intake)

24. Valve guide (one ejdiaust, one intake)

Figure following name of part indicates quantity necessary for one complete assembly.

Figure 3B-1. Cylinder Head - Exploded View

Figure 3B-2. Compressing Valve Spring

Figure 3B-2. Compressing Valve Spring

Figure 3B-3. Valve Seat Tolerance

Valve stem-valve guide clearance is as follows: Exhaust valves, .004 in. to .006 in. loose; intake valves, .002 in. to .004 in. loose. If valve stems and/or guides are worn to exceed the maximum tolerances by more than .002 in., new parts must be installed.

Tap out valve guides with shouldered drift pin (from chamber side) and insert replacement guide on arbor press. Be particularly careful to press replacement guide squarely into hole.

New valve guides are reamed to correct size. However, when guides are pressed into cylinder heads, they may close up slightly; also the ends may be burred. Therefore, after new guides are in place, they should be sized and cleaned with Valve Guide Reamer, Part No. 94830-47.

It is of prime importance that valve guides fit tightly in cylinder heads, or valves may not seat properly. If original guide or new standard guide is not a tight press fit, an oversize guide must be installed. Oversize guides can be obtained. 001 in. to .006 in. oversize.

stem extends through guide excess of maximum shown valve seat inserts must be replaced, or an oversize valve installed.

A special gage is available under Part No. 96490-59 which is used to measure this dimension. The tool consists of a gage valve and gage which is placed over the valve stem as shown. If top end of gage valve stem is between steps on gage, the valve seat location is satisfactory.

Cylinder heads may be returned to factory through authorized Harley-Davidson dealer for valve seat insert replacement. Heads are bored out to remove old seats, and new seats are pressed into place.

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