Figure 4-11. Water pump, fan and fan belt.

Figure 4-11. Water pump, fan and fan belt.

4-29. Spark Plugs.

a. Removal. Remove spark plug cables from

plugs, blow all loose dirt from spark plug area and

unscrew spark plugs. Discard spark plug gaskets.

b. Inspection.

(1) Inspect shell for breaks and stripped

threads.

(2) After removal (a above), check insulation

for breaks, cracks, or chips.

(3) Check for carbon deposits, oil film, and

burned electrodes.

c. Cleaning and Test.

(1) Clean spark plugs with an abrasive type

spark plug sand blaster. After cleaning remove all

traces of abrasive from inside spark plug.

(2) Test spark plugs with an approved spark

plug tester.

d. A d j u s t m e n t . File center electrode flat, and

after cleaning, adjust gap to 0.035 inch by bending

side electrode only.

e. Replacement. Replace plugs that are obviously

damaged, that fail to pass test, or have severely

burned electrodes.

f. Installation. Reverse a above, torquing plugs

to 25 to 30 foot-pounds torque. Use new spark plug

gaskets.