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You are here:Home > Mercury Outboard Models > 1960 - 1963 > Merc 400 > Lower Unit
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O RING
List Price: $1.00
Our Price: $0.85
You save $0.15!

Mark 35A
Mark 50
Mark 55, 55A
Mark 75, 75A
Mark 75A
1960 Merc 300
1961 Merc 350
1984 - 1989 Merc 35 (2 cyl)
1963 - 1969 Merc 350
1980 - 1983 Merc 40 (2 cyl)
1989 - 1996 Merc 40 (4 cyl)
1960 - 1961 Merc 400
1970 - 1971 Merc 400 (2 cyl)
1972 - 1979 Merc 402
1986 - 1989 Merc 45 (4 cyl)
1962 - 1964 Merc 450 (2 cyl)
1986 - 1990 Merc 50 (3 cyl)
1980 - 1985 Merc 50 (4 cyl)
1965 - 1979 Merc 500
1984 - 1990 Merc 60 (3 cyl)
1972 - 1979 Merc 650 (3 cyl)
1977 - 1983 Merc 70 (3 cyl)
1960 - 1961 Merc 700 (6 cyl)
1960 - 1961 Merc 800 (6 cyl)
VENT SCREW KIT
List Price: $2.90
Our Price: $1.95
You save $0.95!

Gear Case Vent screw with gasket for gear cases of many smaller Mercury Outboards.
GEARCASE DRAIN SCREW WITH GASKET
List Price: $5.70
Our Price: $4.35
You save $1.35!

Gear Lube Drain screw with gasket for most Mercury lower units.  (Also used as vent screw in 1963 and newer 35HP and larger non-racing gear cases.)

Was 10-79953T2

This is used as both drain & vent on 1974 & prior models.  1975-76 use this for vent screw and 22-67892A06 magnetic drain screw.
MERCURY PREMIUM GEAR LUBE 8oz
List Price: $6.13
Our Price: $5.75
You save $0.38!

Mercury Premium Gear Lube for use in gear housings of all Mercury, Mariner, and Force outboards. 8 oz.
GEAR LUBE
Our Price: $7.80

Gear Grease- 105 Lubriplate replaces original gear grease in all 1, 2, & 4 cyl. Mercurys through 1961. This heavier lube should also be used in non-shift motors of other brands. 10 oz.

Note: Modern 90 weight gear lube is generally unacceptable in these engines.
PROP NUT
List Price: $9.45
Our Price: $8.85
You save $0.60!

Merc 350, 450, 500 (SELF-LOCKING)
BACKING WASHER
Our Price: $10.20

Backing washer for:
Mark 35A, 55, 55A, 58A
1960 - 1963 Merc 300, 350, 400, 450, 500
1964 - 1966 Merc 350
WATER PUMP HOUSING SEAL
Our Price: $11.00

Merc 350, 500
ANODE/TRIM TAB
List Price: $14.49
Our Price: $12.79
You save $1.70!

Genuine Mercury sacrificial aluminum trim tab anode used on 1963 & newer 35 HP and larger models.

Fits most Mercury and Mariner 35HP and above and all Mercury Mercruiser (excluding Bravo drives).
DRIVE/PROP SHAFT SEAL & WATER PUMP COVER SEAL
List Price: $15.70
Our Price: $13.00
You save $2.70!

Drive shaft seal for Mark 35A, 55, 55A, 58, 58A, 75, 75H, 75A, 78, 78A, Merc 300, 350, 400, 450, 500, 600, 650, 700DR

Prop shaft seal for Mark 35A, 50, 55, 55A, 58, 58A, Merc 300, 350, 400, 450, 500

Water pump cover seal for Mark 75, 75A, 78, 78A, Merc 600