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4.5L MPI 250 EC Petrol Engine Parts

A serial number between the range of 2A441953 - 2A999999

Service Items

Lubricants

Engine oil capacity is approximately 4.25 Litres

  • 18-9410-4 - Mercruiser 4.5L MPI 250 EC Petrol Engine Parts SAE 30 Full Synthetic Engine Oil 4.7 Litre (Not available to customers outside the UK)
    18-9410-4
    SAE 30 Full Synthetic Engine Oil 4.7 Litre (Not available to customers outside the UK)
    List Price
    £103.40 Ex VAT
    £124.08 Inc VAT
    Keypart Price
    £36.00 Ex VAT
    £43.20 Inc VAT
    In Stock

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  • 18-9750-0 - Mercruiser 4.5L MPI 250 EC Petrol Engine Parts Power Trim & Tilt Fluid - 10oz/283.5g
    18-9750-0
    Power Trim & Tilt Fluid - 10oz/283.5g
    List Price
    £9.00 Ex VAT
    £10.80 Inc VAT
    Keypart Price
    £7.20 Ex VAT
    £8.64 Inc VAT
    In Stock

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  • 33799-0000 - Mercruiser 4.5L MPI 250 EC Petrol Engine Parts Oil Change Pump Kit (Universal)
    33799-0000
    Oil Change Pump Kit (Universal)
    List Price
    £75.00 Ex VAT
    £90.00 Inc VAT
    Keypart Price
    £63.00 Ex VAT
    £75.60 Inc VAT
    In Stock

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Bravo Specification Components Note: Sea-water Pump mounted on the Engine and NOT in the Sterndrive

  • 18-3016-1 - Mercruiser 4.5L MPI 250 EC Petrol Engine Parts Sea-water Pump Impeller
    18-3016-1
    Sea-water Pump Impeller
    List Price
    £59.90 Ex VAT
    £71.88 Inc VAT
    Keypart Price
    £44.92 Ex VAT
    £53.90 Inc VAT
    Low Stock

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  • Awaiting
    Image
    57-8M0097728
    Serpentine Belt - - for Bravo Spec - Direct Cooling
    List Price
    £73.26 Ex VAT
    £87.91 Inc VAT
    Keypart Price
    £65.93 Ex VAT
    £79.12 Inc VAT
    Please Contact for Stock Status

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  • 18-2412-1 - Mercruiser 4.5L MPI 250 EC Petrol Engine Parts Engine Coupler - Replacement (Engine Alignment will need to be checked when replacing this item)
    18-2412-1
    Engine Coupler - Replacement (Engine Alignment will need to be checked when replacing this item)
    List Price
    £464.22 Ex VAT
    £557.06 Inc VAT
    Keypart Price
    £371.38 Ex VAT
    £445.66 Inc VAT
    In Stock

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Cooling System

  • 18-3649 - Mercruiser 4.5L MPI 250 EC Petrol Engine Parts Thermostat 160 deg - (for Direct Cooling)
    18-3649
    Thermostat 160 deg - (for Direct Cooling)
    List Price
    £46.27 Ex VAT
    £55.52 Inc VAT
    Keypart Price
    £32.39 Ex VAT
    £38.87 Inc VAT
    Low Stock

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  • Awaiting
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    864493
    Thermostat 170 Deg- Genuine - (for Fresh-water Cooling)
    List Price
    £19.83 Ex VAT
    £23.80 Inc VAT
    Keypart Price
    £17.85 Ex VAT
    £21.42 Inc VAT
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  • 18-4226 - Mercruiser 4.5L MPI 250 EC Petrol Engine Parts Drain Tap - Blue Plastic
    18-4226
    Drain Tap - Blue Plastic
    List Price
    £7.44 Ex VAT
    £8.93 Inc VAT
    Keypart Price
    £5.95 Ex VAT
    £7.14 Inc VAT
    In Stock

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  • 18-2909 - Mercruiser 4.5L MPI 250 EC Petrol Engine Parts Exhaust Manifold to Head Gasket (2 required per engine)
    18-2909
    Exhaust Manifold to Head Gasket (2 required per engine)
    List Price
    £8.10 Ex VAT
    £9.72 Inc VAT
    Keypart Price
    £7.29 Ex VAT
    £8.75 Inc VAT
    Please Contact for Stock Status

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  • Awaiting
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    27-8M2004414
    Exhaust Manifold to Riser Gasket - Direct Cooling - (2 required per Engine)
    List Price
    £48.45 Ex VAT
    £58.14 Inc VAT
    Keypart Price
    £43.60 Ex VAT
    £52.32 Inc VAT
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  • Awaiting
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    27-8M2004606
    Exhaust Manifold to Riser Gasket - Freshwater Cooled Engines - (2 required per Engine)
    List Price
    £151.56 Ex VAT
    £181.87 Inc VAT
    Keypart Price
    £136.40 Ex VAT
    £163.68 Inc VAT
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  • Awaiting
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    57-8M0087881
    Serpentine Belt for Alpha spec - - Direct Cooling
    List Price
    £87.19 Ex VAT
    £104.63 Inc VAT
    Keypart Price
    £78.47 Ex VAT
    £94.16 Inc VAT
    Please Contact for Stock Status

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  • Awaiting
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    865597T
    Belt Tensioner - Genuine
    List Price
    £74.24 Ex VAT
    £89.09 Inc VAT
    Keypart Price
    £66.82 Ex VAT
    £80.18 Inc VAT
    Please Contact for Stock Status

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  • Awaiting
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    865777
    Idler Pulley - Non Grooved - Genuine
    List Price
    £45.66 Ex VAT
    £54.79 Inc VAT
    Keypart Price
    £41.09 Ex VAT
    £49.31 Inc VAT
    Please Contact for Stock Status

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  • 807166A1 - Mercruiser 4.5L MPI 250 EC Petrol Engine Parts Exhaust Shutter - (2 required per engine)
    807166A1
    Exhaust Shutter - (2 required per engine)
    List Price
    £84.09 Ex VAT
    £100.91 Inc VAT
    Keypart Price
    £75.68 Ex VAT
    £90.82 Inc VAT
    In Stock

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  • 18-2748 - Mercruiser 4.5L MPI 250 EC Petrol Engine Parts Upper Exhaust Riser to Downpipe Bellows 4" ID - (2 required per engine)
    18-2748
    Upper Exhaust Riser to Downpipe Bellows 4" ID - (2 required per engine)
    List Price
    £90.89 Ex VAT
    £109.07 Inc VAT
    Keypart Price
    £68.17 Ex VAT
    £81.80 Inc VAT
    In Stock

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  • 18-2746 - Mercruiser 4.5L MPI 250 EC Petrol Engine Parts Lower Exhaust Riser to Downpipe Bellows 4" ID - (2 required per engine)
    18-2746
    Lower Exhaust Riser to Downpipe Bellows 4" ID - (2 required per engine)
    List Price
    £71.60 Ex VAT
    £85.92 Inc VAT
    Keypart Price
    £53.74 Ex VAT
    £64.49 Inc VAT
    In Stock

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Fuel System (Engine)

  • Awaiting
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    18-7981
    Fuel Filter - Replacement - - for Fuel Supply Module
    List Price
    £57.30 Ex VAT
    £68.76 Inc VAT
    Keypart Price
    £45.84 Ex VAT
    £55.01 Inc VAT
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  • 92-8M0079745 - Mercruiser 4.5L MPI 250 EC Petrol Engine Parts Quickstor Fuel Stabiliser - 355ml (12oz) - Genuine
    92-8M0079745
    Quickstor Fuel Stabiliser - 355ml (12oz) - Genuine
    Keypart Price
    £12.83 Ex VAT
    £15.40 Inc VAT
    In Stock

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Optional Fuel System Components

For additional types of Fuel Filters & Elements, please visit the Racor & Separ sections of our Website. These can be found under the "Accessories" heading on our Home Page.

  • 18-7848-1 - Mercruiser 4.5L MPI 250 EC Petrol Engine Parts Fuel Filter Kit with 1/4" Ports - Aluminium Head (Short Filter) 21 micron for Bulkhead Mounting
    18-7848-1
    Fuel Filter Kit with 1/4" Ports - Aluminium Head (Short Filter) 21 micron for Bulkhead Mounting
    List Price
    £40.00 Ex VAT
    £48.00 Inc VAT
    Keypart Price
    £30.00 Ex VAT
    £36.00 Inc VAT
    Please Contact for Stock Status

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  • 18-8074 - Mercruiser 4.5L MPI 250 EC Petrol Engine Parts Barbed Hose Tail for 3/8" ID Hose for Fuel Filter Assembly - Straight
    18-8074
    Barbed Hose Tail for 3/8" ID Hose for Fuel Filter Assembly - Straight
    List Price
    £7.00 Ex VAT
    £8.40 Inc VAT
    Keypart Price
    £5.25 Ex VAT
    £6.30 Inc VAT
    Please Contact for Stock Status

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  • 18-8067 - Mercruiser 4.5L MPI 250 EC Petrol Engine Parts Barbed Hose Tail for 3/8" ID Hose for Fuel Filter Assembly - 90 Deg
    18-8067
    Barbed Hose Tail for 3/8" ID Hose for Fuel Filter Assembly - 90 Deg
    List Price
    £9.00 Ex VAT
    £10.80 Inc VAT
    Keypart Price
    £7.00 Ex VAT
    £8.40 Inc VAT
    Please Contact for Stock Status

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  • 18-7944 - Mercruiser 4.5L MPI 250 EC Petrol Engine Parts Fuel Filter (10 Micron) - Replacement -100mm (3-15/16") Long - - for Bulkhead Mounting
    18-7944
    Fuel Filter (10 Micron) - Replacement -100mm (3-15/16") Long - - for Bulkhead Mounting
    List Price
    £10.28 Ex VAT
    £12.34 Inc VAT
    Keypart Price
    £8.23 Ex VAT
    £9.88 Inc VAT
    Low Stock

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  • 18-7945 - Mercruiser 4.5L MPI 250 EC Petrol Engine Parts 10-Micron Fuel Filter - Replacement - 110mm (4-3/8") Long - - for Bulkhead Mounting
    18-7945
    10-Micron Fuel Filter - Replacement - 110mm (4-3/8") Long - - for Bulkhead Mounting
    List Price
    £10.28 Ex VAT
    £12.34 Inc VAT
    Keypart Price
    £8.22 Ex VAT
    £9.86 Inc VAT
    Low Stock

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  • 18-7945C - Mercruiser 4.5L MPI 250 EC Petrol Engine Parts 10-micron Fuel Filter - Chrome - Replacement - - for Bulkhead Mounting
    18-7945C
    10-micron Fuel Filter - Chrome - Replacement - - for Bulkhead Mounting
    List Price
    £15.00 Ex VAT
    £18.00 Inc VAT
    Keypart Price
    £12.00 Ex VAT
    £14.40 Inc VAT
    Low Stock

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  • 35-802893Q01 - Mercruiser 4.5L MPI 250 EC Petrol Engine Parts 25-Micron Fuel Filter - Spin On - Genuine - - for Bulkhead Mounting
    35-802893Q01
    25-Micron Fuel Filter - Spin On - Genuine - - for Bulkhead Mounting
    List Price
    £10.28 Ex VAT
    £12.34 Inc VAT
    Keypart Price
    £9.25 Ex VAT
    £11.10 Inc VAT
    In Stock

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Ignition System

  • BPR5EFS - Mercruiser 4.5L MPI 250 EC Petrol Engine Parts Spark Plug - (6 required per Engine)
    BPR5EFS
    Spark Plug - (6 required per Engine)
    List Price
    £6.09 Ex VAT
    £7.31 Inc VAT
    Keypart Price
    £3.04 Ex VAT
    £3.65 Inc VAT
    In Stock

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  • Awaiting
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    300-8M0044991
    Ignition Coil (Dual Output) - Genuine - (3 required per Engine)
    List Price
    £79.25 Ex VAT
    £95.10 Inc VAT
    Keypart Price
    £71.32 Ex VAT
    £85.58 Inc VAT
    Please Contact for Stock Status

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Electrical System

  • 3854164-R - Mercruiser 4.5L MPI 250 EC Petrol Engine Parts 50amp Reset Fuse Unit
    3854164-R
    50amp Reset Fuse Unit
    List Price
    £117.00 Ex VAT
    £140.40 Inc VAT
    Keypart Price
    £81.90 Ex VAT
    £98.28 Inc VAT
    In Stock

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  • 8M6000623 - Mercruiser 4.5L MPI 250 EC Petrol Engine Parts Water Pressure Sensor - Replacement
    8M6000623
    Water Pressure Sensor - Replacement
    List Price
    £143.67 Ex VAT
    £172.40 Inc VAT
    Keypart Price
    £129.30 Ex VAT
    £155.16 Inc VAT
    In Stock

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  • 8M0092849 - Mercruiser 4.5L MPI 250 EC Petrol Engine Parts Stop Switch Lanyard - Genuine
    8M0092849
    Stop Switch Lanyard - Genuine
    Keypart Price
    £13.96 Ex VAT
    £16.75 Inc VAT
    In Stock

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  • Awaiting
    Image
    50-8M0095471
    Starter Motor Assembly
    List Price
    £209.42 Ex VAT
    £251.30 Inc VAT
    Keypart Price
    £188.48 Ex VAT
    £226.18 Inc VAT
    Please Contact for Stock Status

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Repair Items

  • 18-2323 - Mercruiser 4.5L MPI 250 EC Petrol Engine Parts Engine Coupler (Without Yoke) - Replacement - - for Alpha spec Engines
    18-2323
    Engine Coupler (Without Yoke) - Replacement - - for Alpha spec Engines
    List Price
    £299.27 Ex VAT
    £359.12 Inc VAT
    Keypart Price
    £239.42 Ex VAT
    £287.30 Inc VAT
    Please Contact for Stock Status

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Chemicals

  • 20.052 - Mercruiser 4.5L MPI 250 EC Petrol Engine Parts Black Touch-up Paint 10ml (Shipping restrictions may apply)
    20.052
    Black Touch-up Paint 10ml (Shipping restrictions may apply)
    List Price
    £7.30 Ex VAT
    £8.76 Inc VAT
    Keypart Price
    £3.65 Ex VAT
    £4.38 Inc VAT
    In Stock

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  • LOCTITE-243-10ML - Mercruiser 4.5L MPI 250 EC Petrol Engine Parts Loctite Threadlock 10ml
    LOCTITE-243-10ML
    Loctite Threadlock 10ml
    List Price
    £25.00 Ex VAT
    £30.00 Inc VAT
    Keypart Price
    £20.00 Ex VAT
    £24.00 Inc VAT
    In Stock

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  • LOCTITE-243-50ML - Mercruiser 4.5L MPI 250 EC Petrol Engine Parts Loctite Threadlock 50ml
    LOCTITE-243-50ML
    Loctite Threadlock 50ml
    List Price
    £45.00 Ex VAT
    £54.00 Inc VAT
    Keypart Price
    £40.00 Ex VAT
    £48.00 Inc VAT
    In Stock

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  • 92-8M0079745 - Mercruiser 4.5L MPI 250 EC Petrol Engine Parts Quickstor Fuel Stabiliser - 355ml (12oz) - Genuine - - Treats approx 50 Imperial Gallons
    92-8M0079745
    Quickstor Fuel Stabiliser - 355ml (12oz) - Genuine - - Treats approx 50 Imperial Gallons
    Keypart Price
    £12.83 Ex VAT
    £15.40 Inc VAT
    In Stock

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Tools & Manuals

  • 33799-0000 - Mercruiser 4.5L MPI 250 EC Petrol Engine Parts Oil Change Pump Kit (Universal)
    33799-0000
    Oil Change Pump Kit (Universal)
    List Price
    £75.00 Ex VAT
    £90.00 Inc VAT
    Keypart Price
    £63.00 Ex VAT
    £75.60 Inc VAT
    In Stock

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  • 18-8999 - Mercruiser 4.5L MPI 250 EC Petrol Engine Parts Motor Flusher - Dual Feed - Rectangular Cups
    18-8999
    Motor Flusher - Dual Feed - Rectangular Cups
    List Price
    £22.00 Ex VAT
    £26.40 Inc VAT
    Keypart Price
    £17.60 Ex VAT
    £21.12 Inc VAT
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Accessories

  • MP40970-1 - Mercruiser 4.5L MPI 250 EC Petrol Engine Parts Safety Switch - Sierra Marine Works - Coiled Lanyard
    MP40970-1
    Safety Switch - Sierra Marine Works - Coiled Lanyard
    List Price
    £33.00 Ex VAT
    £39.60 Inc VAT
    Keypart Price
    £25.00 Ex VAT
    £30.00 Inc VAT
    Low Stock

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  • UN77310 - Mercruiser 4.5L MPI 250 EC Petrol Engine Parts Battery Master Switch - Sierra Marine Works - 12V/100A Continuous (12V/500A for 10 seconds)
    UN77310
    Battery Master Switch - Sierra Marine Works - 12V/100A Continuous (12V/500A for 10 seconds)
    List Price
    £23.00 Ex VAT
    £27.60 Inc VAT
    Keypart Price
    £16.00 Ex VAT
    £19.20 Inc VAT
    In Stock

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4.5L MPI 250 EC Petrol Engine Parts