Installing Starter Adapter Bearing - Continental Motors GO-300-A Overhaul Manual

Figure 20. Installing Starter Adapter Bearing
10-25. The manufacturer protects aluminum parts
from corrosion by coating them with "Alodine 1200".
This material is a product of the American Paint and
Chemical Company, Ambler, Penn. "Alodine" coated
parts are easily distinguished by their gold color. In
order to maintain a uniform appearance, the manu-
facturer is painting certain steel and magnesium parts
with gold colored enamel.
10-26. REPAIR OF ENAMEL SURFACES.
10-27. Ferrous parts when painted with gold enamel
will be baked with infra-red equipment, for 15 min-
utes at 275
0
-285
0
F following application of each coat.
Magnesium parts will be pickled and primed, then
baked, with infra-red equipment, for 15 minutes at
275
0
-285
0
F following application of each coat of
enamel.
NOTE
If
a part which was originally "Alodized" is to
be refinished with enamel, it will not be neces-
sary to apply zinc chromate primer except to
the surface areas completely stripped of "Alo-
dine" .
Before application of primer and enamel to a
part, c:arefully mask all connection jOints and
mating- surfaces. No primer of enamel is per-
missible on interior surfaces of fuel pump
adapter, tachometer and oil pump housing, oil
sump, crankcase or any other parts contacted
by eng-ine lubricating oil after assembly.
10-28. "ALODIZING" AND REPAIR OF "ALODIZED"
SURFACES.
44
10-29. GENERAL. Aluminum alloy castings, sheet
metal and tubing are protected from corrosion by
treating all surfaces of the parts with" Alodine 1200"
(American Paint and Chemical Co., Ambler, Pa.).
"Alodine", unlike enamel or primer, will not flake
or peel off to contaminate engine lubricating oil;
therefore, corrosion protection can be afforded to all
interior aluminum surfaces and parts. If an enamel
coating is required for a part previously treated with
"Alodine", application of a primer before painting is
not necessary. "Alodizing" will be performed after
all machining and/or repair operations have been
completed. The surface color of an "Alodized" part
may vary from light gold to dark brown. When a
part is treated with "Alodine 1200" the thickness of
the film, or buildup, on the mating or bearing sur-
faces is so fine that the effect on dimensional toler-
ances is negligible.
10-30. APPLICATION OF "ALODINE 1200". In the
event the original finish of an aluminum part has
deteriorated or been removed, the part may be
"Alodized" as described in "Alodine" manufacturers
Technical Service DataSheetNo.AL-1200-D. Wrought
or die cast (smooth surface) parts, such as valve
rocker covers and intake tubes, should be tumbled or
sand blasted to roughen before treatment.
10-31. REPAIR OF ALODIZED SURFACES. If "Alo-
dized" parts have been remachined, rubbed with
abraSives or scratched in handling so as to expose
areas of bare aluminum, the surface may be re-
paired by local application of "Alodine" solution in
the following steps:
a. Clean the parts' bare area thoroughly with carbon
tetrachloride. Do not under any circumstances use an
oil base solvent such as General Specification, P-S-
661, TT-291 or alkaline cleaner.
b. Mix a small quantity of hot water (180
0
F) with
1-1/2 to 2 ounces of "Alodine 1200" powder to form
a paste, then gradually dilute with hot water until a
solution of one gallon is attained. This solution is to
be adjusted with nitric acid addition to a PH value of
1.6 (1.5 to 1. 7).
c. Application shall be made, with a rubber set
paint brUSh, in a manner so the solution flows over
the area.
d. Allow solution to remain on the part from one to
five minutes or until color of the new film is approx-
imately the same as the original.
e. Flush part with clear water and dry with air. Do
not blast or rub with cloth to dry new film area.
If
color is too light, repeat steps "c" and "d" until
desired color is obtained.
NOTE
If "Alodine" does not adhere to metal, a more
severe cleaning method must be used. A solu-
tion of 12 to 16 ounces of Oakite No. 61 per one
gallon of water is preferred. Apply and re-
move the solution with caution because an
alkaline cleaner of this type will remove any
"Alodine" film previously applied. Remove
cleaning solution thoroughly with plenty of hot
water and vigorous brushing.