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Page Title: Blower Drive Gear Installation
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TM 5-4210-220-34 3-8. ENGINE - Continued 3-8.7 Gear Train - Continued a. Blower Drive Gear Installation NOTE There  are  no  timing  marks   on   the   blower   drive gear.    Therefore  it  is  not  necessary  to  aline  this gear in any particular position during the installation procedure. (1) Affix  a  new  gasket  (5)  to  the  blower  drive gear  support  (4)  and  attach  the  gear  and support assembly to the cylinder block rear end  plate  with  capscrews  (2)  and  copper washers (3).  Tighten the capscrews to 30 ft lb (41 Nm). (2) ttach  the  lubrication  line  (1)  to  the  blower drive support (4). (3) Check the gear backlash between the blower drive gear (6) and the camshaft gear.  To accurately check the backlash, all of the flywheel housing attaching capscrews must be tightened to their proper torque, see para. 3-8.6.  Backlash should be 0.002 0.008 in.  (0.051 0.203 mm), and should not exceed 0.010 in.  (0.254 mm). (4) Install the blower, see para.  3-8.3. b. Idler Gear Installation (1) Position     the     crankshaft     gear     and the camshaft gear so the timing marks will aline with those on the idler gear. (2) With   these   marks   aligned,   start   the   idler gear (5) into mesh with the crankshaft gear and    camshaft    gear,    and    simultaneously rotate  the  gear  hub  (3)  so  the  dowel  (4)  in the   hub   mates   with   the   hole   in   the   end plate.    Then,  using  a  soft  faced  hammer, gently tap the hub  until  it  seats  against  the end plate. (3) Secure    the    idler    gear    assembly    to    the cylinder block using the special washers (2) and bolt (1).  Tighten the bolt to 90 ft lb (122 Nm). (4) Lubricate the idler gear bearing and gear teeth with engine oil (item 17, Appendix B). (5) After  installation  is  complete,  check  the  backlash  between  the  mating  gears.    Allowable  backlash  for  new gears  is  0.002  0.008  in.    (0.051  0.0203  mm).    Backlash  must  not  exceed  0.010  in.    (0.254  mm)  for  worn gears. 3-146

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