Hardin Marine

Oil Cooler Cover Gasket - Starboard Side

These gaskets are used with Mercury Racing flywheel housing oil coolers.

Oil Cooler Jam Nut

Oil Cooler - 2" Diameter, 8" Length, 1" NPT Connection

This cooler features thirty-one 1/4" cooling tubes with displacement baffles. It also has 3/8" NPT oil connections with an 1/8" NPT drain. Operating pressure of up to 150 PSI. Designed for power steering or transmission applications.

Oil Cooler - 2" Diameter, 8" Length, 3/4" NPT Connection

This cooler features thirty-one 1/4" cooling tubes with displacement baffles.  It also has 3/8" NPT oil connections with an 1/8" NPT drain.  Operating pressure of up to 150 PSI.  Designed for powersteering or transmission applications.

Oil Cooler - 2" Diameter, 9" Overall Length, 1-1/4" Hose Connection

• 3/8" NPT oil connections
• 1/8" NPT drain
• Operating pressure of up to 150 PSI.
• Replaces Mr Cool MRC205EE-05, Seakamp 25134, R&D Enterprises RD205EE-05, Sen-Dure 1125-12-S

Oil Drain Hose Fitting

This fitting is a replacement for 620-242179

Oil Drain Hose Fitting

This fitting is a replacement for 620-242180

Oil Filler Plug

These oil resistant rubber oil fill plugs are used to seal oil fill holes in valve covers.  This cap measures 1.22 in diameter.

• Oil Line Thru Hull for Mayfair Trim Tabs (4) required per kit.
• 4-1/2" long.
• Also replaces Mercury OEM #844142A01 and #845521A1
• Sold Each

Oil Pressure Sender 0-80 PSI, Hardin Gauge (2018 and Earlier), Medallion

Oil Pump Drive Mandrel Kit - External Oil Pump Drive Mandrel

For use on supercharged engines to space the oil pump drive gear out away to clear the supercharger pulley.  This billet 6061-T6 aluminum drive mandrel with stainless mounting hardware is the very best we've seen anywhere.  Designed to be used in conjunction with a 755-3100 reverse mount crossover mounted alternator and a 755-2000 pulley and 625-3129 spacer.  Each mandrel features stainless belt guides and mounts to any 6 bolt pattern crank pulley and will accept standard 1" ID X 1" Wide with 1/8" keyway oil pump drive gears.

Oil Pump Drive Mandrel Kit - External Oil Pump Non-Supercharged Drive Mandrel

For use on supercharged engines to space the oil pump drive gear out away to clear the supercharger pulley.  This billet 6061-T6 aluminum drive mandrel with stainless mounting hardware is the very best we've seen anywhere.  Designed to be used in conjunction with a 755-3100 reverse mount crossover mounted alternator and a 755-2000 pulley and 625-3129 spacer.  Each mandrel features stainless belt guides and mounts to any 6 bolt pattern crank pulley and will accept standard 1" ID X 1" Wide with 1/8" keyway oil pump drive gears.

• Non-corrosive hardware
• Gasket sealed lens and bezel to prevent fogging
• Plastic body Domelux Technology Lens
• White back light
• Senders sold separately
• 2 1/16 hole size, Outer diameter 2 5/16
• Not Designed to be used with Diesel Engines.
• NOTE: This older style gauge matches 2018 and earlier model Hardin Gauges.

Need help measuring your gauges so you know what to look for when you finally upgrade to a more polished set? Check out this handy tutorial!

Oldsmobile 455 2-piece Rear Main Seal- Sold Each

These excellent rear main seals are designed to replace worn, deteriorated original equipment seals and provide years of trouble free service

Sold Each

Olds 350-455 10 Quart Stern Drive / Jet Drive Performance Oil Pan

Marine oil pans are subject to special conditions. Closed engine compartments create a lack of air flowing around the oil pan causing higher oil temperatures, which can destroy the lubricating properties of the oil in low capacity pans. The motion of the boat in the water sloshes the oil in pans that don't have correct baffling. Air is ingested through the oil pick-up resulting in momentary loss of oil pressure. The oil is tossed into the crank, which foams and aerates it. The pounding effect of oil in the pan cause fractures in pans without reinforcement.

• 1/2"-20 drain plug

The design and construction of Dooley oil pans insures there are no problems, even in the roughest conditions. Here are just a few of the Dooley oil pan features:

• High capacity oil sumps
• 16 gauge steel construction
• Precision oil baffles
• Block fitted and double leak checked for a perfect fit every time
• Gold iridite plated for corrosion protection
• Tig welded for maximum strength
• Oil temperature gauge bung provisions
• One way oil control doors ensure oil is contained at the oil pump pick-up where it needs to be.
• Uses existing engine mounted windage tray

These oil pans offer a value unsurpassed in the marine industry today.

Olds 350-455 Xtreme Marine Seal™ Valve Cover Gasket- Sold in Pairs

There is nothing more frustrating than a leaking valve cover seal, so don't settle for anything less than the best. That's why professional engine builders nationwide demand Xtreme Marine Seal valve cover gaskets. Produced from a blend of polymer and cork to provide a gasket that will last.

Sold in Pairs

Big Block Olds 455 Intake Manifold Stainless Steel Allen Bolt Kit

We offer a full selection of intake manifold bolt kits to fit most popularmarine engines. These kits come complete with the correct number of bolts andstainless steel washers. Don't install your new intake manifold with anythingless.

Stainless Steel Bolt Kits - Olds Valve Cover Bolt Kit
We offer a full selection of manifold bolt kits to fit most popular marine engines.  These kits come complete with the correct number of bolts

Stainless Steel Bolt Kits - Olds Header Bolt Kit
We offer a full selection of manifold bolt kits to fit most popular marine engines.  These kits come complete with the correct number of bolts and

Stainless Steel Bolt Kits - Olds Steel Valve Cover Bolt Kit
We offer a full selection of manifold bolt kits to fit most popular marine engines.  These kits come complete with the correct number of b

OMC 460 Ford Replacement Cast Aluminum Exhaust System - 4" or 3.5"

These New Premium Direct bolt 460 Ford manifolds are the ultimate solution for the person looking for a direct bolt on style manifold system for early OMC style applications. Direct bolt on means no leaking adapters or odd hardware to fuss with. Hardin Marine has produced Performance Ford center rise exhaust systems for decades and now is adapting the performance style manifolds and riser to replace OEM OMC Systems . Two systems are offered with one using the 3.5" Y-Pipe hose connection the other a 4" Y-pipe connection.

Hardin adapted the same technology used to develop the powerful manifold systems found on Mercury Racing’s engines to the Ford 460. Individual separated runner port designs provide for improved exhaust efficiency while reducing exhaust back pressure.These manifolds are cast from pure T356 aluminum and then heat treated Included features such as hard anodizing for corrosion resistance and a gloss powder coated for a stunning appearance. Manifolds feature individual port water inlets for balanced even water flow thru the manifold. These exhaust systems require some customer supplied exhaust measurements. Allow 5-6 week lead times to build tailpipesl. (Not for use on Cobrajet heads)

• 35" Overall Width on stock heads.
• 29-1/2" Exhaust Center to Center on stock heads.
• 8" Tall from Exhaust center-line to top of manifold on stock heads.
• 12-3/4" Tall from Exhaust center-line to top of riser on stock heads.

OMC Control Adapter

OMC Sterndrive Cable Adapter

Optima Billet Battery Box, Polished

Dimensions:
• Length: 11-1/2"
• Width: 7-3/4"
• Height: 7-1/4"

Our selection of highly polished aluminum battery boxes offer great looks and battery security all in one. This battery box fits all group 34 / 78 size Optima batteries with blue, yellow, and red tops. Each box assembles with stainless steel hardware.