TM 5-3805-258-24-2DISASSEMBLY AND ASSEMBLYENGINEHEAD ASSEMBLYDISASSEMBLE AND ASSEMBLEstart by:a) remove head assemblyNOTE: Replacement parts are available onlyin kits.REPLACEMENT PARTSItemPart No.Description1,21-111.2.3.4.5.6.7.8.9.7C0571Unloader Kit7C0569Major Repair KitRemove unloader stop assembly (1) anddiscard.Remove piston assembly (2) and discard.Use a spanner wrench to remove inlet valvestop (3).Remove and discard inlet valve spring (4),inlet valve (5), valve seat (6), unloader gasket(7), and unloader spring (8).Remove discharge valve seat (9) using a9/16“ Allen wrench.Remove and discard discharge valve (10) andspring (11).Remove all carbon deposits, rust, and scalefrom all cavities in the cylinder head. Scrapehead assembly and crankcase mating surfacestaking care not to allow foreign material tofall into the cylinder.Inspect the inlet valve stop (3) for excessivewear,nicks, and scratches. If necessary,“dress”surfaces with a lapping stone toremove nicks and scratches.If inlet valve stop is not salvageable, replaceit with a new part.5-18b
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