BUSHING REPLACEMENT.

upon viscosity. Under no circumstances must

and disassemble the distributor as follows:

grease be used in the oil reservoir.

e . Unsnap cap springs, take off cap, rotor and

5-73. CLEANING, INSPECTION AND

dust seal.

TEST OF PARTS.

f. Disassemble terminal. Loosen terminal nut and

Clean and examine all parts of the distributor after

pull wire spring from terminal. (The terminal nut

disassembly. Do not clean cap, rotor, condenser,

o n the inside of the distributor bowl has been

insulators or housing (on units with built-in

eliminated, on some models, and replaced with a

lubrication) in any degreasing compound, since this

n o t c h e d terminal head screw and a special nut

m a y damage the part. Examine the centrifugal

which screws down into a recess in the outer

advance parts, weights, springs and plate, for signs

terminal block.) To detach the terminal assembly,

of wear and replace parts that look worn or

remove the outer hex nut and washer from

o t h e r w i s e damaged. On units with a dust seal,

t e r m i n a l screw. Remove the special slotted nut

replace the sealing washer if it is hard, worn or

w i t h a slotted bit screwdriver or other pronged

dirty. Replace contact points that are worn or

tool. Remove the terminal screw and both matched

p i t t e d , or if the breaker lever rubbing block or

insulator blocks.

bushing is excessively worn. On units with a cam

lubricator, replace the lubricator if the lubricating

g. Take off breaker plate attaching screws and lift

felt wick is worn, hard or dirty.

out breaker plate.

a. Condenser. Inspect the condenser for broken

h. Remove coupling or gear by grinding or filing

leads, frayed insulation and loose or corroded

off the peened-over head of pin and then drive out

terminal. Make sure the condenser is firmly

pin.

m o u n t e d and makes a good ground contact. Be

sure terminal is tight.

i. Unscrew bearing and take the accessory drive

shaft out of the housing.

b. Open the breaker contacts and insulate them

j. Shaft and advance mechanism can now be

with a small card. Check the condenser for

lifted out. Advance mechanism is disassembled by

capacity and grounds by testing from the primary

terminal to the distributor base. If this test shows

taking off nuts fastening hold-down plate in place.

the condenser is defective, remove condenser and

5-72. BUSHING REPLACEMENT.

test again. Replace if second test shows the

condenser is faulty.

B u s h i n g s or bearings can be replaced on many

applications, including units which have built-in

c . Centrifugal Advance. Check the centrifugal

lubrication. Porous bushings are available as service

a d v a n c e mechanism for freeness by turning the

replacement parts (sold by special arrangement),

breaker cam in the direction of rotation and then

but the actual installation requires great care, as

release it. The advance springs should return the

cam to its original position without sticking.

w e l l as the use of a special arbor, in order to

p r e v e n t damage to the bearing surface. Proper

d. Distributor Cap. Wipe out the distributor cap

lubrication with a porous bushing depends upon a

with a clean cloth and inspect it and the rotor for

u n i f o r m predictable seepage of oil through the

c h i p s , cracks and carbonized paths which would

structure of the bushing. The amount of oil which

seeps through a porous bushing may be seriously

allow high-tension leakage to ground. Such defects

affected by scratches or scuffed areas on the

require replacement of the part.

bearing or transmitting surfaces. Porous bushings

5 - 7 4 . REASSEMBLY AND TESTING.

are manufactured to an exact size and should not

be reamed, scraped, or filed. It is very important to

use only the grade of oil specified for the oil

R e a s s e m b l y is the reverse of disassembly. After

r e a s s e m b l y , the contact point opening and cam

reservoir since other grades will allow either

e x c e s s i v e or inadequate lubrication, depending

a n g l e should be checked and adjusted, refer to

5-52