Line Reaming Pinion Gear Shaft Bushing

Note: Illustration shows installation of reamer guide in crankcase to guide reamer when reaming bronze pinion shaft bushing in gear case cover. Cover must of course, be installed on right crankcase before starting the reaming operation. While illustration shows reaming Side Valve Engine pinion gear shaft bushing, same procedure is to be followed when reaming O.H.V. Engine pinion gear shaft bushing.

Valve Tappets and Valve Tappet Guides

Note: Remove tappet guides and tappet assemblies if only for purpose of checking endplay of cam gears, when reassembling engine.

Inspect valve tappets for excessive clearance in guides. Also check tappet rollers for excessive bearing looseness and damaged roller faces.

Tappets and tappet guides are normally long-life parts that seldom reguire replacement. Tappets are originally fitted with .0005" to .001" clearance in guides. Guides are a light press fit in crankcase and are secured with screws.

Excessive tappet-guide clearance is serviced by fitting new tappet, and/or new guide. It is recommended practice to renew tappet complete when only the roller is excessively loose or otherwise in bad order; however, it is possible to renew only the roller, roller bushing and pin. If this is done, roller must turn freely and have about .008" side-play after new roller pin is securely riveted in tappet.

When end of valve tappet adjusting screw is worn hollow from action of valve stem, it should be replaced to ensure, accurate tappet-valve stem adjustment.

O.H.V. Engine: Exhaust tappets are interchangeable with each other, but are longer than intake tappets, and therefore, are not interchangeable with them.

Intake tappets are interchangeable with each other.

Tappet guides are not interchangeable.

To remove a tappet, it is first necessary to pull tappet guide out of crankcase. Pull tappets out to limit of travel and tie them together with piece of string or rubber band so they won't drop down. Remove tappet guide screws and drive guides out with a hammer and block of wood, resting wood against lower end of tappet guide.

Before installing a tappet and tappet guide assembly, pull the two tappets out to limit of travel and tie them together with a piece of string or rubber band so they won't drop down while installing the assembly. After installing tappet guide gasket, drive the assembly in crankcase with a hammer and block of wood, aligning screw holes in tappet guide with screw holes in crankcase as assembly is being driven in.

Side Valve Engine: Tappets are interchangeable.

Front exhaust and front intake tappet guides are interchangeable with each other, but are not interchangeable with rear exhaust or rear intake tappet guides. Rear exhaust and rear intake tappet guides are interchangeable with each other. If tappet guides are not located correctly in crankcase, tappet rollers will be crosswise to cams and serious damage to engine may result.

To remove a tappet, it is first necessary to pull tappet guide out of crankcase. After removing screws, pull with Harley-Davidson special puller. Part No. 11960-38 (see Illus. 47). Cam gear must be installed in case for tappet to butt against when using puller.

Before installing a tappet and tappet guide assembly, lay crankcase on its side to prevent tappet dropping into crankcase when installing the assembly. Pull tappet out to limit of travel and align screw holes in tappet guide with screw holes in crankcase. Pins of suitable length and size inserted through holes in guide and into crankcase, can be used to good advantage to maintain alignment of tappet guide during installation.

After installing tappet guide gasket, drive assembly in crankcase with hammer and a hollow drift. Front intake tappet guide for 1946 and earlier Models secures the advance and retard guadrant, with a gasket above and below guadrant.

The drift can be made from a round steel bar 15/16" diameter. Drill a %" hole 2" deep for tappet clearance.

DIY Battery Repair

DIY Battery Repair

You can now recondition your old batteries at home and bring them back to 100 percent of their working condition. This guide will enable you to revive All NiCd batteries regardless of brand and battery volt. It will give you the required information on how to re-energize and revive your NiCd batteries through the RVD process, charging method and charging guidelines.

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Responses

  • Valdemar
    What is a intake tappet assembly for knucklehead?
    6 years ago

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