ASSEMBLY AND TESTING

ELECTRICAL

before removing distributor from engine.

D. INSTALLATION

B. DISASSEMBLY (Fig. 42)

Be sure the distributor mounting is clean so

there will be a good ground connection for the

Unsnap the cap springs, remove cap and rotor. Then

distributor.

disassemble terminal, take off breaker plate attaching

screws, and lift out breaker plate. Remove coupling or

Check engine breather pipes, since clogged

gear by grinding or filing off the peened-over head of pin

pipes cause crankcase pressure which will force oil up

and then driving pin out.

Shaft and advance

into the distributor.

mechanism can then be lifted out. Advance mechanism

is disassembled by taking off nuts fastening hold-down

If the advance mechanism of the old

plate in place.

distributor was found to be worn, check the engine for

worn timing gears or oil pump, since these cause

backlash which produces torsional vibration; such

vibration causes rapid advance mechanism wear.

Be sure to install the new distributor all the

way down in its mounting well. If the distributor is not

pushed all the way down, the distributor shaft is likely to

seize in the distributor housing and ruin the distributor.

E. TIMING WITH ENGINE RUNNING

Hook-up the timing light to the No. 1 spark

plug (nearest the counterweight).

Paint or chalk the timing marks on the

crankshaft pulley.

Run engine at 600 RPM. No. 1 plug should

fire 2 degrees before top dead center.

Loosen

distributor clamp screw and rotate distributor clockwise

to advance or counterclockwise to retard timing.

Tighten clamp screw. Recheck timing with the light.

Figure 42.

F. TIMING WITH ENGINE NOT RUNNING

C. ASSEMBLY AND TESTING

Locate No. 1 cylinder spark plug wire on

Reverse

disassembly

procedure

distributor cap; mark distributor body adjacent to No. 1

assemble distributor.

wire socket in cap. Remove distributor cap.

After reassembly, the contact point opening

Intermittently operate starter until

and cam angle should be checked and adjusted.

Breaker lever spring tension should also be checked and

adjusted, if necessary. Then the distributor should be

carefully tested on a distributor tester that will check the

centrifugal advance mechanism.

B-82