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TM 5-4210-220-34
3-8.
ENGINE.
3-8.9
Piston, Liner, Rings, Rod and Rod Bearings.
(14)
Ream bolt holes in rods with J28460 reamer if nicks or burrs are present.
(15)
Check piston pin bushing for scoring or overheating. Replace bushing if scored or if worn less then 0.086 in.
(2.184 mm) thick.
(16)
Inspect piston pin for signs of fretting or scouring. Measure pin diameter. Replace pin if worn to less than
1.4980 in. (38.049 mm).
(17)
Inspect rod bearings for excessive and unusual wear. Inspect crankshaft for scoring, see para. 3-8 10.
(18)
Install new rod bearings each time rod assembly is removed. Bearings are available as standard and 0.002,
0.010, 0.020 or 0.030 in. undersize. Refer to para. 3-8.10 for crankshaft and bearing sizing.
b.
Liner Inspection
(1)
Thoroughly clean liner inner bore and outer circumference. Use wire brush on outer circumference, if
necessary, to clean scale build-up on water cooled portion of liner.
(2)
Inspect liner for:
•
Cavitation or erosion above air ports. If present replace liner.
•
Cracks. If present, replace liner
•
Scoring. If excessive, replace liner. If slightly scored, liners may be cleaned, honed and reused.
•
Flange Irregularities. Flange must be flat and smooth on both top and bottom surfaces. Replace liner if
surfaces are uneven.
•
Liner insert. Must be flat and smooth on both top and bottom surfaces. Replace if evidence of brinelling
is present.
•
Liner contact area to block; examine the outside diameter of liner for fretting below the ports. Material
transfer from block to liner may be removed from surface of liner and reused if all other specifications are
met.
(3)
A used liner must always be honed if reused in engine. The honing process breaks the glaze and removes
ridge formed during engine operation. The glaze must be removed to properly seat new piston rings.
NOTE
Do not hone the surface finish of a new service liner as it has been properly finished at the factory.
(4)
Place liner in holding fixture. Secure to hold liner but do not distort conformity of liner.
NOTE
Do not use original engine block to hold liners unless engine is dismantled and thoroughly cleaned afterward
to ensure that all abrasive materials is removed. A scrap engine block makes an excellent holding fixture to
hold liners during honing procedure.
3-166
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