Volvo Penta D2-55 Rebuild, common faults and everything you need to know
The standard choice on 35-45 foot cruising yachts throughout the early 2000s. Naturally aspirated, mechanical in-line pump, Shibaura N844L block via the Perkins-Shibaura JV. Discontinued in 2016.
The D2-55 was the most widely installed Volvo Penta marine diesel of the 2000s. We most often see it from 35-45 foot cruising yachts that have run their 3 000-5 000 operating hours and are starting to show the typical symptoms: MDI fault codes, exhaust elbow corrosion, dropping compression. The block (Shibaura N844L via the Perkins-Shibaura JV) is robust and can take a full rebuild, but it is the ancillaries - heat exchanger, riser, MDI unit, injection pump - that usually dictate the scope required. We carry out everything from cylinder head reconditioning, cylinder boring and crankshaft reconditioning to complete engine reconditioning in our own machine shop with 12-month warranty. See also our boat engine rebuild hub page.
The D2-55 in brief
Data taken from Volvo Penta's product brochure for the D2-55 (2007 + 2008), cross-verified against Shibaura N844L industrial service data.
D2-55 variants A-F
Six generation versions from 2001 to 2016. Power and displacement unchanged. The production periods overlapped heavily according to yachtboatparts.com and hr-club.net.
| Variant | Period | Change |
|---|---|---|
| D2-55A | 2001-2004 | Original launch, MDI control |
| D2-55B | 2003-2005 | Updated alternator, wiring harness |
| D2-55C | 2004-2005 | EVC integration, new instrument panel |
| D2-55D | 2006-2007 | Emissions tweaks |
| D2-55E | 2007-2008 | ECU update |
| D2-55F | 2008-2016 | Final production version |
NOTE - production discontinued. Manufacturing ended in December 2016. A US EPA recall followed in 2017. The D2-50 (lower power) and D2-60 (turbo) replaced the D2-55 in Volvo Penta's current range.
Marine-specific components
What sets the D2-55 apart from the industrial N844L and must be checked at every major service or rebuild.
Common faults on the D2-55
Cross-verified against the YBW Forum, Marine Parts System technical bulletins, Nordkyn Design MDI analysis, the Hallberg-Rassy Club and the Bavaria Yacht Owners forum.
The MDI unit throws unexplained fault codes
Most common D2 fault • High- Symptoms
- Sporadic ignition cut-outs, the engine stops without warning, the instrument panel shows a fault, restarts again after a reset.
- Cause
- The MDI unit (Marine Diesel Interface) is the electronic control unit of the D2 series. Salt moisture and vibration cause corroded contact pins and cold solder joints on the circuit board. Nordkyn Design describes the MDI as "the least reliable part of an otherwise excellent engine".
The exhaust elbow and riser corrode
5-7 seasons • High- Symptoms
- Salt water in the wake, sooty colour on the exhaust, white smoke when warm, salt drips under the engine.
- Cause
- The exhaust's water-cooled riser has aluminium and steel components. Salt water causes internal corrosion - perforation can lead to hydraulic lock if the engine sits idle. Stainless steel upgrades are sold by Parts4Engines among others.
Heat exchanger blocked internally
Recurring • Medium- Symptoms
- Lowered thermostat opening temperature, overheating under load, lower top rpm.
- Cause
- Limescale and salt deposits on the raw water side. Aluminium passages corrode internally.
Raw-water impeller breaks up
Recurring • Medium- Symptoms
- No cooling water flow, overheating within minutes, impeller blades lodging in the heat exchanger.
- Cause
- The neoprene impeller cannot take running dry - around 15-30 seconds without water is enough to destroy it. The seating surface in the pump housing wears.
Injector nozzles carbon up
3,000+ hours • Medium- Symptoms
- Rough idle, black smoke under load, dropping top rpm, increased fuel consumption.
- Cause
- Natural wear on the nozzle needles and coking of the diesel residue in the nozzle tip.
D2-55 rebuild prices
Prices based on D2-55 specifications (4 cyl, 84 mm bore, 8 valves, 5 main bearings + 4 big-end bearings). All prices excl. VAT and parts. All main operations - cylinder boring, crankshaft grinding, cylinder head resurfacing - carried out in our own machine shop.
Cylinder head reconditioning
Bottom end
Full rebuild
Marine components
Cylinder machining
| Service | Price |
|---|---|
| Cylinder boring 4 cyl (84 mm) | 3 318 kr |
| Plateau honing 4 cyl | 1 050 kr |
| Cylinder liner replacement 4 cyl | 7 800 kr |
Crankshaft work
| Service | Price |
|---|---|
| Crankshaft grinding (5 main + 4 big-end) | 3 010 kr |
| Polishing standard | 1 022 kr |
| Cleaning 4-cyl crankshaft | 784 kr |
Cylinder head reconditioning
| Service | Price |
|---|---|
| Resurfacing cast-iron cylinder head 4 cyl | 1 590 kr |
| Valve seat cutting 8 valves | 910 kr |
| Valve guide replacement 8 pcs (cast iron) | 1 580 kr |
| Cylinder head pressure testing | 1 876 kr |
See also
Other Volvo Penta marine diesels we service and related services.
Questions and answers about the D2-55
Is the D2-55 still in production?
No. Production ended in December 2016. A US EPA recall followed in 2017. The D2-50 (lower power) and D2-60 (turbo) replaced the D2-55 in Volvo Penta's current range. Spare parts are still available through the Volvo Penta network and by cross-reference with the Perkins 404 series.
What does it cost to rebuild a Volvo Penta D2-55?
A cylinder head reconditioning costs 6 500-8 500 kr in labour. A complete engine rebuild 28 000-42 000 kr in labour, plus parts typically 8 000-18 000 kr depending on condition. Marine components (riser, heat exchanger, raw water pump) often add another 5 000-12 000 kr.
Is the D2-55 turbocharged?
No. The D2-55 is naturally aspirated throughout the entire A-F series. It is a widespread misconception to confuse it with the D2-75 (same block, higher power calibration, still NA) or the D4 series (compound-charged common rail).
Which block is used in the D2-55?
The Shibaura N844L. The block is assembled through the Perkins-Shibaura JV from 1996 and badged by Volvo Penta for marine use. Spare parts therefore often cross-reference with the Perkins 404 series and the Caterpillar C2.2. The casting mark reads "N844L 2.216".
How long does a D2-55 last?
5 000-10 000 operating hours with the right maintenance. The block is industrial and can take more than that - it is the heat exchanger, riser, raw water pump and MDI unit that typically set the limit. A well-rebuilt D2-55 gives the owner another 15-20 seasons.
What is the most common fault?
The MDI unit - the electronic control board that throws unexplained fault codes, sporadic ignition cut-outs and stalls under way. Salt moisture and vibration corrode the contact pins. Nordkyn Design describes the MDI as the engine's least reliable component. Diagnosed with Volvo Penta instruments, repaired with a new or reconditioned MDI.
How long does a D2-55 rebuild take?
Cylinder head reconditioning: 1-2 weeks. Complete engine rebuild: 3-5 weeks in the workshop, plus lead time on parts (injection pump, heat exchanger, riser). The winter season (October-April) is the busiest - book well in advance.
Do you have a D2-55 that needs looking over?
Call us or send a quote request. Reply within 24 hours. We service all types of boat engines - see boat engine page. All rebuilds with 12-month warranty.