CLEANING - TM-9-2815-221-34-P0157

CONNECTING ROD AND PISTON ASSEMBLY REPAIR (CONTINUED)

CLEANING

Dry parts with compressed air under moderate pressure.

WARNING

Clean all piston ring grooves with stiff brush.

Dry-cleaning solvent used to clean parts is poten-

tially dangerous to personnel and property. Do

D Clean ring groove oil holes.

not use near open flame or excessive heat. Flash

point of solvent is

WARNING

Clean piston and

rod parts with dry-cleaning

Wear protective rubber gloves, apron, and gog-

solvent (item 8, Appx C) or mineral spirits paint thinner

gles when working with carbon-removing com-

(item 21, Appx C).- -

pound. Work in a well ventilated area. If com-

pound contacts skin, flush skin immediately with

fresh water.

WARNING

Compressed air used for cleaning purposes will

Remove all carbon and varnish deposits from piston with

not exceed 30 psi. Use only with effective chip

carbon-removing compound (item 7, Appx C).

guarding and personal protective equipment

(goggles/shield, gloves, etc.).

NOTE

INSPECTION AND REPAIR

Piston pins should push-fit into piston at room

temperature.

NOTE

Replace piston and pin if pin is loose (see table, p 3-120).

Replacement pistons with piston pins and rings

are available in standard size and 0.010-, 0.020-,

NOTE

and

oversize.

To check ring gap, fit each ring to cylinder wall at

A Replace piston and pin if piston is damaged or excessively

bottom of its travel. Use a piston to

ring

worn. (See table, page 3-120 for connecting rod and piston

in cylinder bore.

wear limits).

C Check replacement rings for proper ring gap, using a feeler gage.

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