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Mercury 40 Service Manual

Mercury 40
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CYLINDER BLOCK/CRANKCASE
Page 4B-3190-828631R3 MARCH 1999
2. Install the second and top compression rings (“T” side up). Spread rings just enough to
slip over piston.
53818
a
b
c
a-Top Compression Ring ( “T” Side Up)
b-Second Compression Ring ( “T” Side Up)
c-Install Side of Ring Stamped “T” Towards Top of Piston
Piston Installation
1. Align piston ring end gaps as shown.
UP
b
d
a
c
a-End Gap – Top Compression Ring
b-End Gap – Second Compression Ring
c-End Gap – Upper Oil Ring Rail (Align with Locating Pin)
d-End Gap – Lower Oil Ring Rail
NOTE: Cylinder bores must be clean before installing pistons. Clean with light honing, as
necessary. After honing, clean cylinder bores with water and detergent. After cleaning, swab
cylinder bores several times with engine oil and a clean cloth, then wipe with a clean dry
cloth.

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Mercury 40 Specifications

General IconGeneral
BrandMercury
Model40
CategoryOutboard Motor
LanguageEnglish

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