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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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BEARING SPREAD DIMENSIONS
ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 ENGINE Fig. 123  Installing Distributor Drive Gear Using SE-1900 Tool Set with Thrust Bearing 1. Nut 3. Distributor drive gear 2. Sleeve 4. Thrust bearing 2. Install  fuel  pump  cam  against  distributor  drive  gear on camshaft using SE-1900-14 sleeve with SE1900- 16 adapter and thrust bearing in a manner similar to Step 1. 3. Install  camshaft  gear  against  fuel  cam  on  camshaft using  SE-1900-14  sleeve  with  SE-1900-16  adapter and thrust bearing in a manner similar to step 1. 4. Install   camshaft   gear   alien   screw   and   torque   to specified torque.  See "Torque Chart." Crankshaft Bearings The bearing inserts used in this engine are selective fit and require no line reaming upon installation.  The bearings are available for service in standard and undersizes for use on journals that have been reground. If  inspection  revals  badly  worn  or  scored  bearings, replace the bearings. The installation of new bearings must be closely checked to maintain the proper clearance between the journal  and  the  bearing  surface.    A  convenient  and  accurate method    for    checking    the    clearance    is    with    the    use    of Plastigage. A.  General Fitting Procedures When wear reduces the bearing-tocrankshaft running clearance,  undersize  precision-type  bearing  shells  should  be installed.  Premature bearing failure will result from attempts to  reduce  journal-to-bearing  running  clearances  by  reworking bearing caps, bearings or both.  Such reworking will alter the engineered fit of the bearing shells in their bores and destroy the specifically desired "crush." When    installing    precision-type    connecting    rod    or main  bearings,  it  is  important  the  bearing  shells  fit  tightly  in the  bore.    The  bearing  manufacturer  makes  the  diameter  at right  angles  to  the  parting  line  slightly  larger  than  the  actual diameter   of   the   bore   into   which   they   are   assembled   to accomplish  this.    When  the  assembly  is  drawn  up  tight,  the bearing  is  compressed  assuring  a  positive  contact  between the  bearing  back  and  the  bore.    This  increased  diameter  is referred to as bearing "crush," Figure 124. Fig. 124  Illustrating Bearing Crush 1. Difference between 2. Diameter (A) at diameters (A) and right angles to (B) is bearing parting lines crush (C) greater than dia- meter (B). 3. With bearing cap drawn up tight diameters (A) and (B) equal. CGES-210  Page 49 PRINTED IN UNITED STATES OF AMERICA

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