Figure 3-75.Cylinder head prepared for pressured test.

TM 10-3930-634-34

larged by corrosion, use a wooden plug or other suit-

(g) Inspect thewater nozzles tomake surethey

able tool to expand the nozzles so that they will remain

are not loose in the cylinder head.

tight after installation.

(h) Replace the cylinder head water nozzles as

3 Press the nozzles into place with the outlet

follows:

holes positioned as illustrated in figure 3-78. The

1 Make sure thewater inlet ports inthebot-

angle between the outlet holes in the nozzles is 90 de-

tom of the head are clean and free of scale. Use a 5/8-

grees. The nozzles must be flush to 1/32 inch below the

inch diameter drill to clean the holes. Break the edge

bottom surface of the cylinder head, otherwise inter-

of the hole slightly.

ference with proper seating of the head on the cylinder

2 Make sure the nozzles fit tight in the cylin-

block may be encountered.

der head. If the water holes in the head have been en-

e. Reassembly..

CAUTION

When installing the plugs in the fuel mani-

fold, apply a small amount of sealant as a

"dual purpose sealer" to the threads of the

plugs only. Work the sealant into the threads

and wipe off excess sealant with a clean lint-

free cloth so that the sealant will not be

washed into the fuel system and result in se-

rious damage to the fuel injectors.

(1) Cylinder head plugs and studs. Install all cylin-

der plugs and studs if removed.

(2) Exhaust valve seats.

(a) Clean the valve seat insert counterbores in

the cylinder head and the valve seat inserts with clean-