EXCESSIVE BLACK OR GRAY EXHAUST SMOKE (ENGINE AT NORMAL OPERATING TEMPERATURE). (Cont) -726250167

TM 9-2320-364-34-1

Allow engine to cool before performing troubleshooting maintenance. If necessary use insulated pads

and gloves. Hot engine components will burn and cause injury to personnel.

VISUAL INSPECTION

(1) Remove blower bypass valve

(Para 4-7).

(2) Push blower bypass valve piston

open by hand. Spring pressure

should fully close valve.

(a) If blower bypass valve piston

cannot be opened with hand

pressure or will not fully seat with

spring pressure, replace blower

bypass valve (Para 4-7).

(b) If blower bypass valve piston can

be opened with hand pressure

and fully closed with spring

pressure, blower bypass valve is

OK.

(3) Install blower bypass valve (Para 4-7).