Service parts for the 300
Grouped by system, with how many of each the parts manual calls for.
Air intake
1 requiredFuel system
1 requiredOil system
1 requiredBelts
1 requiredHydraulic system
1 requiredPrices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.
Specifications
Ratings spec sheet not in our library yet — see the documents below.
Maintenance & consumables
for the Mercury Marine 300R| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | Aluminum Bowl | 200-21AL | Amazon eBay | ||
| Fuel filter | 10 Micron Element | 301-W | Amazon eBay | ||
| Fuel filter | Refer to Fuel and Oil | — | 100 hr | ||
| Oil filter | Ariens OE Filter | OL1801 | Amazon eBay | ||
| Battery | 800 minimum marine cranking amps (MCA) with a minimum reserve capacity of 135 RC25 rating | — | 100 hr | ||
| Belt | Ariens OE Belt | OL4010 | Amazon eBay | ||
| Coolant | Refer to Fuel and Oil | — | 100 hr | ||
| Hydraulic filter | Element w/Gasket | 301-MPG | Amazon eBay | ||
| Oil | Refer to Fuel and Oil | — | 100 hr | ||
| Spark plug | NGK LKAR7C-9, 0.9 mm (0.035 in.) gap, 14 mm hex size | — | 50 hr |
Common questions
Which engine powers the Mercury Marine 300?
The Mercury Marine 300 is powered by the Mercury Marine 300R engine.
Which oil filter part number does the Mercury Marine 300 take?
The Mercury Marine 300 uses oil filter part number OL1801.
Which fuel filter part number does the Mercury Marine 300 take?
The Mercury Marine 300 uses fuel filter part number 301-W.
What air filter fits the Mercury Marine 300?
The Mercury Marine 300 uses air filter part number 200-21AL.
Parts
130| Part # | Description | Qty | System | |
|---|---|---|---|---|
| 100-28 | Bowl Plug Gasket | 2 | Gasket | Amazon eBay $13.97 |
| 100-30 | 1/4 In. Draincock | Draincock | Amazon eBay FridayParts $69.99 | |
| 100-GK | Complete Gasket Kit (See Accessories Page) | Gasket | Amazon eBay | |
| 101-30 | 30 Micron Element | 1 | Filter | Amazon eBay |
| 101-W | 10 Micron Element | 1 | Filter | Amazon eBay |
| 150-GK | Complete Gasket Kit (See Accessories Page) | Gasket | Amazon | |
| 151-30 | 30 Micron Element | Filter | Amazon | |
| 151-W | 10 Micron Element | Filter | Amazon | |
| 200-11 | Nylon Gasket | 1 | Gasket | Amazon eBay FridayParts $27.48 |
| 200-12 | Upper T-Bolt Seal | 1 | Seal | Amazon Amazon eBay eBay $38.80 FridayParts $17.99 |
| 200-13 | Lower T-Bolt Seal | 1 | Seal | Amazon eBay FridayParts $9.50 |
| 200-17 | Centerpipe O-Ring | 1 | Seal | Amazon eBay FridayParts $9.50 |
| 200-19A | Bowl Gasket | 1 | Gasket | Amazon eBay |
| 200-21AL | Aluminum Bowl | 1 | Air filter | Amazon eBay |
| 200-21BP | Clear Bowl w/Water Sensor Probes | 1 | Air filter | Amazon eBay |
| 200-21H | Clear Bowl w/Heater Probes | 1 | Air filter | Amazon eBay |
| 200-21HBP | Clear Bowl w/Water Sensor & Heater Probes | 1 | Air filter | Amazon eBay |
| 200-21M | Clear Bowl w/Marine Collar for Marine Units | 1 | Air filter | Amazon eBay |
| 200-22 | Reverse Flow Gasket | 1 | Gasket | Amazon eBay FridayParts $12.99 |
| 200-30U | 1/4 In. U.L. Approved Draincock | Draincock | Amazon | |
| 200-32 | O-Ring | 1 | Seal | Amazon eBay |
| 200-DGK | Dealer's Gasket Kit Assortment | Gasket | Amazon eBay | |
| 200-GK | Complete Gasket Kit | 1 | Gasket | Amazon eBay |
| 200-H | Diesel Fuel Filter/Water Separator with In-Filter Heater — Operates on either 12 or 24 Volt systems. (10 Micron Element) | 1 | Air filter | Amazon FridayParts $58.00 |
| 200-M | Marine Diesel Fuel Filter/Water Separator — U.L. Listed. Meets U.S. Coast Guard requirements. | 1 | Air filter | Amazon |
| 200-W30 | Diesel Fuel Filter/Water Separator — (30 Micron Element) | 1 | Air filter | Amazon |
| 201-30 | 30 Micron Filter Element for DAHL 200 Series | Filter element | Amazon | |
| 201-W | 10 Micron Filter Element for DAHL 200 Series | Filter element | Amazon | |
| 24-WLK | Dash-Mounted Water Sensor | Sensor | Amazon | |
| 285-DS | Heat Deflector Shield for Marine Units | 1 | Air filter | Amazon eBay |
| 300-MFV | Two Diesel Fuel Filter/Water Separators Manifolded with Shut-Off Valves — Allows continuous operation while servicing. | 2 | Air filter | Amazon eBay |
| 300-MFV3 | Three Manifold Diesel Fuel Filter/Water Separator with Shut-Off Valves for Continuous Operation | 2 | Air filter | Amazon |
| 300-MMV | Two Marine Diesel Fuel Filter/Water Separators Manifolded with Shut-Off Valves — Allows continuous operation while servicing. U.L. Listed. Meets U.S. Coast Guard requirements. | 2 | Air filter | Amazon eBay |
| 300-MMV3 | Triple Marine Manifold Diesel Fuel Filter/Water Separator with Shut-Off Valves for Continuous Operation | 2 | Air filter | Amazon eBay |
| 301-30 | 30 Micron Element | 1 | Filter element | Amazon eBay FridayParts $72.19 |
| 301-CS | Water Absorbing Element for DAHL 300 Series | Filter element | Amazon | |
| 301-MPG | Element w/Gasket | 1 | Filter element | Amazon eBay |
| 301-W | 10 Micron Element | 1 | Filter element | Amazon eBay |
| 500-12 | Seal Clamp (20 In.) | 1 | Seal | Amazon FridayParts $226.30 |
| 500-15 | O.D. O-Ring (20 In.) | 2 | Seal | Amazon |
| 500-BP | Diesel Fuel Filter/Water Separator with Water Sensor Warning Light Kit — Equipped with a 110 Volt Electrical Connector. | 1 | Air filter | Amazon |
| 500-BP22 | Diesel Fuel Filter/Water Separator with Water Sensor Warning Light Kit — Equipped with a 220 Volt Electrical Connector. (For Overseas Operation) | 1 | Air filter | Amazon |
| 500-MFVBP22 | Double Manifold Diesel Fuel Filter/Water Separator with Shut-Off Valves — Allows for continuous operation and Water Sensor Warning Light Kit. — Equipped with a 220 Volt Electrical Connector. (For Overseas Operation) | Air filter | Amazon | |
| 501-30 | Elements (30 Micron Element) | 7 | Air filter | Amazon FridayParts $104.39 |
| 501-W | Elements (10 Micron Element) | 7 | Air filter | Amazon |
| 60-30 | 1/4 In. Draincock (See Model 65) | Draincock | Amazon | |
| 60-GK | Complete Gasket Kit | Gasket | Amazon eBay | |
| 61-W | 10 Micron Element | Filter | Amazon eBay | |
| 64269 | Sport Master ratio, 137 mm (5.4 in.) RH, 720 mL (24.4 fl oz) | Ratio | Amazon eBay | |
| 64307 | Left-hand rotation gearcase—LL | Gearcase | Amazon eBay | |
| 64308 | Left-hand rotation gearcase—LL | Gearcase | Amazon eBay | |
| 64532 | Sport Master ratio, 137 mm (5.4 in.) LH, 680 mL (23.0 fl oz) | Ratio | Amazon eBay | |
| 66-30 | 30 Micron Element | Filter | Amazon | |
| 66-W | 10 Micron Element | Filter | Amazon | |
| 85-P | Pressure Gauge | 2 | Gauge | Amazon |
| 85-V | Vacuum Gauge | Gauge | Amazon | |
| AB11E | Single-Tine Bale Spear – 2000 lbs. | Bale spear | Amazon eBay | |
| AB12E | Triple-tine bale spear (single tine replaceable) | Bale spear | Amazon eBay | |
| AB13E | Triple-tine bale spear (single tine replaceable) | Bale spear | Amazon eBay | |
| AD11 | Debris Grapple AD11 | Grapple | Amazon eBay | |
| AE11 | Free-Stall Scraper AE11 | Scraper | Amazon eBay | |
| AF11 | Front Blade AF11 | Blade | Amazon eBay FridayParts $34.50 | |
| AM11 | Manure Fork with Grapple AM11 | Manure fork | Amazon eBay | |
| AP12F | Pallet Fork AP12F (Fixed, replaceable) | Pallet fork | Amazon eBay | |
| AP13F | Pallet Fork AP13F (Floating, replaceable) | Pallet fork | Amazon eBay | |
| AP13G | Floating Pallet Fork AP13G | Pallet fork | Amazon eBay | |
| AR10 | Rock Bucket AR10 | Rock bucket | Amazon eBay | |
| AR12 | Rock Bucket AR12 | Rock bucket | Amazon eBay | |
| AS10 | Snow Push AS10 | Snow push | Amazon eBay | |
| AS11 | Snow Push AS11 | Snow push | Amazon eBay | |
| AY11 | 4-in-1 Bucket AY11 | Bucket | Amazon eBay | |
| N009 | Power connect - bus stabs (150-1000 amp open construction only) | 1 | Power connect | Amazon eBay |
| OL0910 | Ariens OE Air Filter | 1 | Air filter | Amazon eBay |
| OL1801 | Ariens OE Filter | 1 | Oil filter | Amazon eBay |
| OL2080 | Ariens OE Spark Plug | 1 | Spark plug | Amazon eBay |
| OL4010 | Ariens OE Belt | 1 | Belt | Amazon eBay |
| OL4370 | Ariens OE Filter | 1 | Fuel filter | Amazon eBay |
| OL4690 | Ariens Coolant | 1 | Coolant | Amazon eBay |
| TAR67942 | Front Seal | 1 | Seal | Amazon eBay |
| TAT24252 | Oil Pump O-Ring | 1 | Seal | Amazon eBay |
| TR113752 | Oil Pump Tube | 1 | Pump | Amazon eBay |
| TR61871 | Oil Pump O-Ring | 1 | Seal | Amazon eBay |
| TR75729 | Rocker Cover Gasket | 1 | Gasket | Amazon eBay |
| TR87627 | O-Ring Valve | 1 | Seal | Amazon eBay |
| TR97341 | Oil Pan Gasket | 1 | Gasket | Amazon eBay |
| TR98460 | Head Gasket | 1 | Gasket | Amazon eBay |
| TRE33705 | Thermostat 180F | 1 | Thermostat | Amazon eBay |
| TRE38570 | O/H Gasket Set | 1 | Gasket | Amazon eBay |
| TRE38848 | Head Gasket Set | 1 | Gasket | Amazon eBay |
| TRE44574 | Rear Seal | 1 | Seal | Amazon eBay |
| 63381 | Service access door | Service part / kit | Amazon eBay | |
| 8M0175492 | Manual, Operation and Maintenance | 1 | Service part / kit | Amazon eBay |
| TAR51902 | Main Bearing | 1 | Service part / kit | Amazon eBay |
| TAR70633 | Piston Ring Set | 1 | Service part / kit | Amazon eBay |
| TAT18005 | Con Rod | 1 | Service part / kit | Amazon eBay |
| TAT18009 | Upper Gear | 1 | Service part / kit | Amazon eBay |
| TAT18031 | Crankshaft | 1 | Service part / kit | Amazon eBay |
| TAT21132 | Con Rod Bearing 0.010 | 1 | Service part / kit | Amazon eBay |
| TAT21134 | Con Rod Bearing 0.020 | 1 | Service part / kit | Amazon eBay |
| TAT21136 | Con Rod Bearing 0.030 | 1 | Service part / kit | Amazon eBay |
| TAT21139 | Con Rod Bearing Standard | 1 | Service part / kit | Amazon eBay |
| TIK3481 | Engine I/F Kit | 1 | Service part / kit | Amazon eBay |
| TOK3481 | Engine O/H Kit | 1 | Service part / kit | Amazon eBay |
| TPLK481 | Piston-Liner Kit | 1 | Service part / kit | Amazon eBay |
| TR114282 | Ring Gear (142T) | 1 | Service part / kit | Amazon eBay |
| TR26125 | Valve Spring | 1 | Service part / kit | Amazon eBay |
| TR51112 | Thrust Bearing | 1 | Service part / kit | Amazon eBay |
| TR51734 | Valve Insert Exhaust Standard | 1 | Service part / kit | Amazon eBay |
| TR54985 | Rocker Shaft | 1 | Service part / kit | Amazon eBay |
| TR73064 | Valve Insert Intake Standard | 1 | Service part / kit | Amazon eBay |
| TR74194 | Bolt Con Rod | 6 | Service part / kit | Amazon eBay |
| TR79623 | Intake Valve Standard | 1 | Service part / kit | Amazon eBay |
| TR79624 | Exhaust Valve Standard | 1 | Service part / kit | Amazon eBay |
| TR79625 | Exhaust Valve 0.003 | 1 | Service part / kit | Amazon eBay |
| TR79626 | Exhaust Valve 0.015 | 1 | Service part / kit | Amazon eBay |
| TR79628 | Intake Valve 0.003 | 1 | Service part / kit | Amazon eBay |
| TR79629 | Intake Valve 0.015 | 1 | Service part / kit | Amazon eBay |
| TRE11410 | Valve Rotator | 1 | Service part / kit | Amazon eBay |
| TRE27348 | Thrust Bearing Standard | 3 | Service part / kit | Amazon eBay |
| TRE27349 | Thrust Bearing 0.010 | 3 | Service part / kit | Amazon eBay |
| TRE27352 | Piston Ring Standard | 3 | Service part / kit | Amazon eBay |
| TRE27353 | Piston Ring 0.010 | 3 | Service part / kit | Amazon eBay |
| TRE27358 | Thrust Bearing 0.020 | 3 | Service part / kit | Amazon eBay |
| TRE27360 | Piston Ring 0.020 | 3 | Service part / kit | Amazon eBay |
| TRE27364 | Thrust Bearing 0.030 | 3 | Service part / kit | Amazon eBay |
| TRE27368 | Piston Ring 0.030 | 3 | Service part / kit | Amazon eBay |
| TRE31929 | Oil Cooler | 1 | Service part / kit | Amazon eBay |
| TRE31973 | Rocker Arm | 1 | Service part / kit | Amazon eBay |
| TRE55343 | Con Rod | 1 | Service part / kit | Amazon eBay |
| TRE55900 | Camshaft Kit | 1 | Service part / kit | Amazon eBay |
Service, wear & replacement parts referenced for this model and its engine — confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.
Available documents
Engine spec — MER-6151 175-300 V6 V8 FS SS (Mercury Marine)Owner's manual — 8M0175492 (Mercury Marine)