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You are here:Home > "Mark" Models > Mark 55H > Lower Unit
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SHEAR PIN
Our Price: $1.25

SHEAR PIN - See model guide for application
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.
NLA PROP NUT
List Price: $5.24
Our Price: $4.75
You save $0.49!

Mark 40H, Mark 55H (SELF-LOCKING)
PROP SHAFT SEAL
Our Price: $6.38

Mark 40H, 55H
CRANKCASE/PROP SHAFT BEARING
Our Price: $7.60

Crankcase bearing fits Mark 5, KF5, KF3, Mark 6 & 6A

Propshaft bearing fits Mark 30 & 55H
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.
TOP/BOTTOM CRANKSHAFT SEAL, DRIVE SHAFT SEAL & PROP SHAFT SEAL
Our Price: $10.80

This is the top crankshaft seal for models K, KB & KD models, KE3, KE4, KE4A, KF3, Mark 7

This is the bottom crankshaft seal on the KF-3 for serial # 358552 thru 358612 and 358616 & up.

This is the drive shaft seal for Mark 10, 10A, 15A, 28, 28A, 40H, 55H, Merc 100, 150, 200, 350, 500, 650

This is the prop shaft seal for Mark 75H
DRIVE SHAFT BALL BEARING
Our Price: $18.10

Mark 30H, 55H
DRIVE SHAFT/ PROP SHAFT BEARING
Our Price: $21.35

Drive shaft bearing for Mark 10, 10A, 15A, 28, 28A, 30H, 55H, Merc 100, 150, 200 & 250

Prop shaft bearing for Mark 5, 6, 6A, KF5 & KF3