4. Bushing type bearings are machined for proper clearance and need no reaming.
(7) Oil Seals. Oil seals must be replaced when thin feather edge is damaged or when seal
material has become hard or brittle.
(a) Removal. Press or pry damaged oil seal from casting or adapter being careful not to
damage bore in casting or adapter.
1. When oil seal bore in casting or adapter is burred or damaged to a point where an
oil tight seal is impossible, replace casting or adapter.
2. Remove slight nicks, burrs and scratches from bore in casting or adapter with
crocus cloth dipped in cleaning solvent.
(c) Installation. Install new oil seal in bore of casting or adapter using proper oil seal
d. Disassembly/Assembly Instructions
(1) General. Extreme care must be exercised in all component assembly operations to insure
satisfactory engine performance. Precautionary rules for assembly are outlined below.
(2) Precautionary Rules.
Cleanliness is essential in all component assembly operations.
Dirt and dust, even in minute quantities, are abrasive.
Parts must be cleaned as specified and kept clean.
Wrap or cover parts and components when assembly procedures are not immediately
Coat all bearings and all contact surfaces with engine oil (App C, Item 16) to insure
lubrication of parts during initial engine starting.
Replace all gaskets and preformed packings removed in disassembly. Clean and
remove all traces of gasket material from surfaces.
Store all fastening hardware (nuts, bolts, screws, and flat washers) in or with the related
component to assist in reassembly.