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You are here:Home > "Mark" Models > Mark 78 > Lower Unit
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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.
WATER PUMP GASKET, LOWER
List Price: $3.60
Our Price: $3.00
You save $0.60!

Water Pump Gasket, lower.  Used on Mark 75, 75A, 78, 78A, and Merc 600
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.
DRIVE/PROP SHAFT SEAL
Our Price: $6.55

Drive shaft seal for Merc 800 DR

Prop shaft seal for Mark 75, 75A, 78, 78A, Merc 600
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.
WATER PUMP GASKET, UPPER
Our Price: $7.99

Water Pump Gasket, upper.  Used on Mark 75, 75A, 78, 78A, and Merc 600.
PROP NUT TAB WASHER
Our Price: $9.50

Mark 75, 75A, 78, 78A, Merc 600
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
WATER PUMP RUBBER VALVE
Our Price: $17.65

NLA Water Pump Rubber Valves used on all 6 cylinder direct reversing models.
LOWER UNIT SEAL KIT
Our Price: $45.35

Lower Unit Seal kit contains all lower unit seals and gaskets for Mark 75, 75A, 78, 78A and Merc 600