Figure 4-11. Pressure Test of Cylinder Head Using Tool J28454.

TM 55-1930-208-24

(d) Tighten the hold down bolts until stopper start to distort. A 5 lb-ft (7 Nm) torque is sufficient. Do not

overtighten.

(e) Install air supply plate.

(f) Install scrap or dummy injector. Tighten clamp bolts to a torque of 20-25 lb-ft (27-34 Nm).

NOTE

Dummy injectors may be made from old injector nuts and bodies, the injector spray tips

are not necessary.

(g) Connect air supply line to air supply plate.

(h) Immerse cylinder head in water preheated to 180 to 200 (82-93 ) for approximately 20 minutes.

WARNING

Wear eye protection when using compressed air. Failure to comply with this warning

can result in injury to personnel.

(i) Apply 40 psi (276 kPa) air pressure.

(j) Check for leaks at top and bottom of injector tubes, oil gallery, exhaust ports, fuel manifolds, and top and

bottom of cylinder head.

(k) Relieve air pressure and remove head from water. Remove testing equipment. Dry thoroughly.

Figure 4-11. Pressure Test of Cylinder Head Using Tool J28454.

4-21