TM 1-1500-204-23-1
Figure 7-2. Engine Conditioning - CONT
Complete
conditioning
When
Personnel
steps
Procedure
performed
responsible
Step 12. Cruising Mixture
Check valve for nozzle not holding,
Check - continued
pumps not synchronized, vapor vents
stuck, low cylinder head temperature,
or improper spark plug gap. On
carburetor engine, idle adjustment
will cause rich or lean mixture.
Step 13. Idle Speed
Close throttle completely. Engine
Complete
Maintenance
Check
should idle at specified rpm and
Conditioning
cylinder head temperature of 150
to 170C (302 to 338F) if equip-
Cockpit Check
Air Crew
ped with individual exhaust stacks
or at lower specified rpm if equip-
Daily Check
Air Crew
ped with an exhaust collector ring.
Intermediate
Air Crew or
Maintenance
Step 14. Idle Mixture
Check Idle mixture and adjust mix-
Complete
Maintenance
Check
ture and speed.
Conditioning
Cockpit Check
Air Crew
Intermediate
Air Crew or
Maintenance
Step 15. Acceleration
Perform acceleration and decelera-
Complete
Maintenance
and Deceleration Check
tion checks. If turbosupercharger
Conditioning
is installed, check with turbosuper-
charger off.
Cockpit Check
Air Crew
Daily Check
Air Crew
Intermediate
Air Crew or
Maintenance
Step 16. Engine Backfire
Because of the nature of this test,
Complete
Maintenance
Test
It should be conducted only after
Conditioning
prescribed Inspection periods or
when trouble is encountered. Con-
duct test with cylinder head temp-
eratures not less than 180C
(356°F) and not more than max-
imum allowable for engine involved.
7-33
