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Volvo Penta MD21

  • Diesel

Engine data

Specifications for Volvo Penta MD21
FuelDiesel
TypeInboard

Autumn and spring plan for Volvo Penta MD21

Here's what to do when hauling out and launching. Always follow the instruction book for your engine.

Autumn

  • Change the engine oil and oil filter5.5 l
  • Replace the fuel filter and water separatorFill the tank to reduce condensation.
  • Winterise the raw water systemLet the engine draw in antifreeze until it comes out of the exhaust, or drain the system as described in the owner's manual.
  • Check the coolant's antifreeze protection
  • Remove the impeller and store it dry
  • Check anodes, belts and hoses
  • Fully charge the batteries and disconnect the negative terminal

Spring

  • Fit the impellerReplace it if it is stiff or cracked.
  • Check belts, hoses, oil level and coolant
  • Check through-hulls, seacocks and hose clamps
  • Charge and connect the batteries, clean the terminals
  • After launching, check that nothing is leakingStart the engine and check that cooling water flows out evenly.
Add to calendarTwo reminders a year: in April and in October.

Email me the plan

Service data

Engine oil

Capacity including filter
5.5 l
Note
Applies to the A version (Indenor XDP).

Valve clearance

Intake
0.15 mm
Exhaust
0.25 mm
Measurement ratio
cold engine

Thermostat & RPM

Thermostat
68 °C
Note
Opens at 68–72 °C, fully open at 83 °C.
Idle
max 650 rpm
Max RPM
4850 (obelastad) rpm

Troubleshooting

Troubleshooting by symptom

Manuals

Exploded views & parts catalogs

  • Shop
    Parts catalog (exploded diagrams) (legacy.marinepartsexpress.com)
    EN · HTML
  • Shop
    Marine Parts Express – exploded views, Volvo Penta diesel (legacy.marinepartsexpress.com)

    Spare parts diagrams by engine model, free to browse.

  • Shop
    Marine-diesel-engine-manuals.com: Volvo Penta (external link)

    Workshop and instruction manuals for AQ, GL/GXi and drives. Some pages can be previewed for free; the full manual must be purchased.

Listings for MD21

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Boats with MD21

10 boat models · A used boat may have had its engine replaced.

Hallberg-Rassy 38Hallberg-Rassy 41Hallberg-Rassy 42EHallberg-Rassy 352Hallberg-Rassy Rasmus 35Malö 50Malö 116Nautor's Swan Swan 47Nautor's Swan Swan 55Vindö 50

Related models

MD1

Inboard

Diesel

MD1B

Inboard

Diesel

MD2

Inboard

Diesel

MD2B

Inboard

Diesel

Service guides

Replacing the impeller →Winterize a boat engine →Find the engine number →

Frequently asked questions about MD21

How much oil does the MD21 take?

MD21 takes about 5.5 litres of engine oil including the filter. Applies to the A version (Indenor XDP).

What is the valve clearance on the MD21?

Intake 0.15 mm and exhaust 0.25 mm, cold engine.

Where can I find the owner's manual for MD21?

Links to owner's manuals and workshop manuals are available under Manuals.

What fuel does the MD21 use?

Volvo Penta MD21 runs on diesel.

Sources