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Paint Stripping and Painting Guidelines for Components
Magnesium Parts
Shroud Tubes
Cylinders
05-00
Page 6
Table 2 (Cont.)
(1) Clean all traces of oil and grease from the part using a neutral, non-
corrosive, degreasing medium followed by a rinse.
(2) Immerse the part for 45 minutes in a hot dichromate solution (3/4
lb. of sodium dichromate to 1 gallon (3.8 liters) of water at 180° to
200°F (82° to 93°C) (as required).
(3) Wash the part thoroughly in cold running water, dipped in hot
water, and dried in an air blast.
(4) Immediately paint the part with a primer coat and engine enamel,
the same as aluminum parts.
(1) Clean and degrease the shroud tube with mineral spirits or
equivalent.
(2) Dip the shroud tube in zinc chromate primer, thinned to spraying
consistency.
(3) Let the primer coat dry.
(4) Paint the outside of the shroud tube with engine enamel.
NOTICE: Paint the cylinder with a Phthalate resin type enamel
(AMS3125C or equivalent MIL-E-7729) properly thinned
with Toluene or equivalent (AMS3180 or equivalent
Federal Spec. TT-T-548).
(1) Remove all old paint from the cylinder.
Paint strippers are usually organic solvents like MEK or acetone or
toluene, etc. and typically will not cause any damage to metals. A vapor
degreaser is best suited for this purpose.
NOTICE: Masking tape, corks, plugs, metal covers, etc. are
acceptable for masking purposes.
(2) Mask off the following parts of the cylinder:
• Rocker box section, including the rocker box flange
• Both valve ports and flanges
• Thermocouple hole
• Spark plug holes
• Push rod shroud tube holes
All other exposed threaded surfaces in which paint could accumulate
(3) Cover the flange area to prevent paint being applied where the
cylinder hold-down nuts contact the cylinder flange.
NOTICE: In the next step, maximum thickness of the paint on the
cylinder flange must be 0.0005 in. (0.0127 mm). Measure
the thickness of the paint with a thickness gage or
equivalent. If a thickness gage is not available, use a
micrometer to measure the thickness of the flange before
and after painting. If the paint is over 0.0005 in. (0.0127
mm) thick, remove the paint and repaint the cylinder flange.
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© 2021 Avco Corporation. All Rights Reserved
February 2021
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