A premium visual breakdown of black smoke, wasted DPF repairs, bore wash from failed injectors, and the decision to fit a reconditioned engine with turbo - prioritising uptime over repair cost.
The fleet manager first noticed black smoke from one of the Transits under acceleration. The driver reported a gradual loss of power, particularly up hills. The van failed its MOT on emissions. An independent garage diagnosed a clogged DPF and failing EGR valve - £1,200 later, the problems returned within three months.
The fleet manager first noticed black smoke from the Transit under acceleration. The driver reported a gradual loss of power, particularly up hills. The van failed its MOT on emissions. An independent garage diagnosed a clogged DPF and failing EGR valve.
The worn injectors were over-fuelling the engine. Unburnt diesel was washing the oil from the cylinder bores - a condition known as "bore wash." This wore the piston rings, causing excessive oil consumption. The excess fuel was also rapidly clogging the new DPF.
"Replace the DPF and EGR. Standard high-mileage Transit issues."
Failed injectors over-fuelling for months. Killed the DPF and EGR. Wore the rings and bores. £1,200 wasted.
The specialist performed a compression test, injector leak-off test, and borescope inspection. The findings were severe - the engine needed a full rebuild or replacement.
"The injectors failed first. They've been over-fuelling for months. That killed the DPF and EGR, and it's worn the rings and bores. You can replace the injectors and rings, but the bores are scored. This engine needs a full rebuild or replacement. The £1,200 you spent on the DPF and EGR was wasted - the injectors killed them again."
The specialist presented three distinct paths. For a fleet vehicle, downtime was the hidden cost that made the exchange engine the clear winner.
Remove engine, rebore cylinders, fit oversized pistons and rings, new injectors, DPF, EGR.
Fully reconditioned long engine with new rings, bearings, gaskets; tested injectors. Exchange basis.
New Ford crate engine with full dealer warranty.
When the specialist removed the injectors and inspected the bores, they found scoring on cylinder 2 that could be felt with a fingernail. The excessive oil consumption from the worn rings meant the turbo had been running with reduced oil quality.
Exchange reconditioned engine only - take the risk on the existing turbo.
£3,800If turbo fails later: add £800-£1,200 + labour.
Replace the turbo preventatively at the same time as the engine.
£4,600£3,800 engine + £800 turbo. Eliminates the risk entirely.
The vehicle was worth approximately £6,000-£10,000 as a runner [THIRD-PARTY - Auto Trader, March 2025]. A rebuild at £2,500-£4,000 plus 10-14 days of lost revenue was less cost-effective than an exchange engine at £3,800 with 2-3 days of downtime.
£2,500-£4,000. 10-14 days off-road. Lost revenue: £1,000-£2,000+.
£4,600 (engine + turbo). 2 days off-road. Back earning money quickly.
"The rebuild is cheaper on paper. But 10 days off the road costs me £1,500 in lost revenue. The exchange engine is back on the road in 2 days. The extra £800 for the turbo is insurance against another failure. I can't afford to do this twice."
£3,800 repair = ~38-60% of value - acceptable for a commercial vehicle.
Downtime cost exceeded £100/day in lost revenue.
DPF and EGR failed due to injectors. Manager accepted the loss and moved to full replacement.
Peace of mind for fleet manager with reconditioned engine warranty.
Could not afford repeat downtime. Chose Path B (preventative turbo replacement).
Reconditioned engine + turbo. 18-month warranty. Van back in 2 days.
The exchange engine cost more upfront, but it fixed everything in one go. The van was back earning money in 2 days. The extra £800 for the turbo was insurance against another failure.
The fleet manager paid £4,600 for a reconditioned engine and turbo - supply and fit. The van was back in service in 2 days. The £1,200 spent on DPF and EGR was written off as a learning experience.
A £500 injector service could save a £3,800 engine. Treating symptoms with DPF and EGR replacement wastes money and time. For fleet operators, downtime is the real cost - an exchange reconditioned engine with a 2-day turnaround is almost always better value than a 10-day rebuild.
Identifies failing injectors before bore wash occurs.
Engine continues to run safely. DPF and EGR survive.
Problems return within months - injectors are still failing.
Van off the road 2-3 days. £1,200 wasted on previous repairs.
| Component | Ford OEM Part Number |
|---|---|
| Injector (remanufactured, each) | BK2Q-9K546-AA |
| Injector seal kit (per injector) | BK2Q-9K546-AB |
| Piston ring set (per cylinder) | BK2Q-6148-AA |
| Cylinder head gasket set | BK2Q-6051-AA |
| Crankshaft bearing set | BK2Q-6333-AA |
| Conrod bearing set | BK2Q-6211-AA |
| Oil pump assembly | BK2Q-6600-AA |
| Timing chain kit | BK2Q-6K255-AA |
| DPF (diesel particulate filter) | BK2Q-5H270-AA |
| EGR valve assembly | BK2Q-9D475-AA |
| Turbocharger (remanufactured) | BK2Q-6K682-AA |
| Oil filter | BK2Q-6714-AA |
| Sump gasket | BK2Q-6710-AA |
Compare quotes from UK Ford specialists for injector failure, bore wash damage, reconditioned engines, turbos, and full replacement options for your Transit.
Data sources used in the content: Engines Market 2025 internal quote data, workshop consensus, third-party vehicle market references, and known Ford Duratorq failure-pattern data.
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