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YO-233-B2A Engine Maintenance Manual
TEO-540-A1A Engine Maintenance Manual
10. Corrosion Prevention
CAUTION:
DO NOT USE PLAIN LUBRICATING OIL.
Before assembly of each subassembly, clean all of the parts to remove the preservative oil,
grease, and unwanted dirt per instructions in Chapter 05-30.
Specific engine parts must be pre-lubricated prior to installation. Many premature part failures
have been caused by incorrect pre-lubrication. If parts are not correctly lubricated, or if an
unapproved lubricant is used, engine parts could become scored before the engine oil has
lubricated the engine during the first cycle of operation. This scoring can cause premature part
failure, or, in some cases, engine failure. As preventive action, during component replacement,
apply the approved lubricant for specified components identified in the latest revision of Service
Instruction No. SI-1059.
11. Painting the Engine and Engine Components
Lycoming Engines recommends that the basic engine be painted as an assembly (without
accessories, intake tubes, fluid lines, wiring harness). However, if it is necessary to paint an
individual component:
• Do not get paint on any mating surfaces or under the cylinder hold down nuts.
• There must be metal-to-metal contact to ensure correct torque.
• Mask mating surfaces and the area where the nut will contact the component surface.
Table 2 includes paint stripping and painting guidelines for components.
All paint is to be sprayed; however, if it is necessary to use a brush, use care to prevent an
accumulation of pockets of paint. Refer to the paint manufacturer's instructions for drying and
curing times.
Parts requiring use of paint for protection or appearance are to be painted in accordance with the
recommendations using the following approved materials:
• Thinner - Toluene or equivalent (AMS3180 or equivalent Federal Spec. TT-T-548).
• Primer - Zinc chromate (AMS3110 or equivalent MIL-P-8585).
• Enamel - Phthalate resin type (AMS3125C or equivalent MIL- E-7729).
NOTICE: All machined bosses are to be masked before painting. Do not paint areas under
hold- down nuts where torque is required.
Paint Stripping and Painting Guidelines for Components
Aluminum and Steel Parts
© 2021 Avco Corporation. All Rights Reserved
February 2021
Table 2
NOTICE: It is not necessary to apply the primer coat if paint has not
been removed from the part.
(1) Clean and degrease the parts with mineral spirits or equivalent.
(2) Apply one coat of zinc chromate primer, thinned with two parts
toluene.
(3) Air dry.
(4) Apply one coat of enamel and bake at 250° F, to 300° F (121 to
149° C), for 1/2-hour.
05-00
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