Mercedes Benz V Class Engine ReplacementCompare Prices & Save

Key points

• • OM651 rebuilt engines average £2,913 supply-only across UK specialists
• • OM642 V6 replacements cost £3,200-£5,800 due to additional components
• • Supply and fit services add £800-£1,500 depending on workshop location
• • All rebuilt units include 12-month unlimited mileage warranty as standard
• • Early W447 models may require timing chain kit inclusion at extra cost

Key points

• • Post-2017 OM651 engines feature improved tensioners with better longevity
• • Regular oil changes every 10,000 miles critical for chain lubrication
• • EGR and DPF systems need periodic cleaning on high-mileage fleet use
• • Most OM651 units exceed 150,000 miles with proper servicing
• • Metallic rattling at cold start indicates immediate inspection needed

Key points

• • Early W447 tensioners wear prematurely between 60,000-90,000 miles
• • Short-trip urban driving accelerates chain stretch due to cold operation
• • Oil pump wear reduces lubrication pressure to rear-mounted chain assembly
• • Metallic rattling at cold start is the primary warning symptom
• • Replacement kits now include upgraded tensioners as standard fix

Key points

• • Rebuilt OM651 engines average £2,913 versus £8,000+ dealer pricing
• • Specialist rebuilders address known failure points like timing chains and seals
• • Bench testing ensures performance matches factory specifications before dispatch
• • Warranty coverage protects against premature failure post-installation
• • Minimal downtime compared to sourcing rare used engines from breakers

Key points

• • Pre-facelift OM651 engines carry highest timing chain failure risk
• • OM642 V6 oil cooler seals degrade around 80,000-120,000 miles
• • Check service history for AdBlue system maintenance on Euro 6 models
• • Verify timing chain replacement documentation before purchasing used
• • Post-2017 OM651 and well-maintained OM642 units offer better reliability

Key points

• • Oil changes every 10,000 miles maximum for commercial shuttle usage
• • Timing chain inspection recommended at 60,000 miles on early OM651
• • EGR and DPF cleaning extends engine life on high-mileage fleet vehicles
• • Coolant and oil cooler seal replacement prevents OM642 catastrophic failures
• • AdBlue system maintenance critical for Euro 6 compliance and longevity

Key points

• • Used engines offer lowest cost but carry unknown mileage and condition risks
• • Rebuilt engines replace worn components like chains, seals and gaskets
• • Reconditioned units include cylinder honing, new bearings and full testing
• • All EngineMarket options include minimum 12-month unlimited mileage warranty
• • Supply and fit available across all three condition tiers for convenience

Key points

• • Rattling confirms tensioner failure and excessive chain slack on OM651
• • Continued driving accelerates wear on guides and sprockets irreversibly
• • Engine may enter limp mode but damage progresses regardless of driving style
• • Immediate specialist inspection required before further mileage accumulation
• • Replacement with upgraded timing kit prevents repeat failure on rebuilt units

Key points

• • AdBlue consumption averages 1L per 600-800 miles on V Class diesel
• • Injector nozzle crystallisation common on high-mileage airport transfer vehicles
• • NOx sensor failures trigger warning lights but don't damage engine internals
• • Regular AdBlue top-ups prevent dosing system blockages and expensive repairs
• • Rebuilt engines include AdBlue system compatibility verification as standard

Key points

• • DVLA lookup confirms engine code, fuel type and production year instantly
• • OM651.911/921/941 fit V220d/V250d/V300d W447 variants respectively
• • OM642.901/920 apply to V300 CDI and Viano 3.0 W639 models
• • Engine code verification prevents costly compatibility errors on order
• • All EngineMarket quotes include code-matched warranty coverage automatically