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Piston Installation - TM-5-4210-220-34_459
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TM-5-4210-220-34 Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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Piston Installation - TM-5-4210-220-34_461
TM 5-4210-220-34 3-8. ENGINE - Continued 3-8.9 Piston, Liner, Rings, Rod and Rod Bearings - Continued (7) Install  spacers  (6) on  the  two  connecting rod-to-piston pin attaching bolts (3). (8) Apply small  amount  of  antiseize  compound (item  4,  Appendix  B)  to  bolt  threads  and bolt head contact surfaces. (9) Aline   connecting   rod   with   piston   pin   and install  bolts  (3)  fingertight.    Clamp  rod  in vise  and  tighten  bolts  to  60  ft  lb  (81  Nm). Do not over torque. (10)  Place   piston   pin   retainer   (2)   in   position. Place    crowned    end    of    installer    J23762 against  retainer,  strike  tool  hard  enough  to deflect retainer and seat it evenly in piston. Install second retainer. (11)  Inspect the width of the land is even around the retainer. (12)  Place suction cup of detector J23987-01 over retainer and operate the lever to pull vacuum of 10 in.  on the gage.  A drop in gage reading indicates leakage at the retainer. (13)  Replace/reseat piston pin retainer if there is any leakage. (14)  With the liner installed in the block, and the block and piston at room temperature, use feeler gage J5438-01 to measure skirt to liner clearance, hold piston upside-down in liner and  check  clearance  in  four  places  90 deg.  apart. (15)  Select a feeler gage with a thickness that will require a pull of six lbs to remove.  The clearance will be 0.001 in.  (0.03 mm) greater than the thickness of the feeler gage.  The clearance must be less than 0.012 in.  (0.31 mm). (16)  If any binding occurs between piston and liner, examine piston and liner for burrs.  Remove burrs with  fine hone and recheck clearance. (17)  Pistons are fitted with three compression rings and two oil control ring assemblies. (18)  Insert one compression ring at a time into the cylinder liner in the ring travel area.  Liner can be in block or reconditioned on bench.  Use a piston skirt to push ring parallel with top of liner’ and measure ring gap with feeler gage.  The end gap should be 0.025 - 0.045 in. (0.64 - 1.14 mm). (19)  If the gap on compression ring is insufficient it may be increased by filing the ends of the ring.  File so  the cutting action is from the outer surface to the inner surface to prevent chipping or peeling of chrome plate on ring. (20)  Check ring side clearance on piston in each compression groove.  The top fire ring clearance,  measured with the keystone fire ring flush with the outside diameter of the piston crown should be 0.0010 - 0.0050 in.  (0.025 - 0.127 mm). 3-170

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