15+ Years SDV6/TDV6 Experience
We've saved hundreds of engines from scrap through timely crankshaft intervention. Deep knowledge of failure patterns, machining limits, and viable repair thresholds.
SDV6 & TDV6 Crankshaft Specialists | Regrind & Replacement
Land Rover & Jaguar SDV6/TDV6 Crankshaft Repair | Engine Failure Specialists
Crankshaft failure on the 3.0L SDV6 and TDV6 is a known design vulnerability, often triggered by oil starvation, bearing wear, or extended service intervals. A loud knock from the bottom end or persistent low oil pressure warning demands immediate attention. While a full engine rebuild can cost £5,000–£8,000, early diagnosis often allows for crankshaft regrinding or targeted replacement at significantly lower cost.
We specialise in engine-out crankshaft assessment, precision regrinding to OEM undersize tolerances, or replacement with new OEM-spec cranks where necessary. Every repair includes new bearings, oil pump, timing chain kit, and a 12-month unlimited mileage warranty.
SDV6/TDV6 Specialists
Regrind / Replace
12-Month Warranty
Fixed Price
★★★★★ 5.0/5 from 172 reviews
Bottom End Knock?
Loud thumping on cold start indicates bearing failure. Stop driving immediately.
Low Oil Pressure?
Warning light after oil change suggests worn bearings or pump failure.
Symptoms of Crankshaft Failure
Crankshaft issues progress rapidly from minor noise to catastrophic seizure. Identifying these signs early can save thousands in secondary damage repairs.
- Loud knocking or thumping: Distinctive deep metallic knock from the bottom end, most audible on cold start or under load. This indicates excessive bearing clearance.
- Low oil pressure warning: Dashboard warning illuminates even after fresh oil and filter change. Caused by increased bearing clearances allowing pressure loss.
- Metallic debris in oil/filter: Visible copper or steel particles in the oil filter or sump during inspection. Confirms active bearing or journal wear.
- Engine vibration increasing with revs: Imbalance caused by uneven bearing wear or crankshaft runout transmits through the block.
- Sudden seizure: Complete engine lock-up if a bearing shell spins or crank journal welds to the connecting rod. Catastrophic and often terminal.
Critical Warning
If you hear bottom-end knocking, do not drive the vehicle. A failing crankshaft can snap without warning, destroying the engine block, pistons, and conrods. Arrange recovery or collection immediately for professional assessment.
Unsure About the Noise?
We offer fixed-price diagnostics including oil pressure testing, borescope inspection, and oil analysis to confirm whether your crankshaft is the source before committing to major work.
Book a DiagnosticModels & Engines Affected
The 3.0L diesel V6 platform shares common crankshaft architecture across multiple JLR models. Highest risk applies to vehicles with extended service intervals or mileage exceeding 100,000 miles.
| Model | Generation | Engine Code | Years | More Info |
|---|---|---|---|---|
| Land Rover Discovery 4 | LR4 | 306DT / 306D1 | 2009–2016 | View → |
| Range Rover Sport | L320 / L494 | 306DT / 306D1 | 2009–2018 | View → |
| Range Rover | L322 / L405 | 306DT | 2009–2018 | View → |
| Jaguar XF | X250 | 306DT | 2009–2018 | View → |
| Jaguar XJ | X351 | 306DT | 2009–2018 | — |
Note: Early 306DT engines (pre-2012) carry higher risk due to original manufacturing tolerances. Later SDV6 variants improved bearing specifications but remain susceptible to oil starvation-related failures.
Why Crankshafts Fail on SDV6/TDV6
Unlike timing chain issues which are primarily tensioner-related, crankshaft failure stems from lubrication breakdown and material fatigue. The root causes include:
- Oil starvation: Clogged oil pickup strainer (from timing chain guide debris), failing oil pumps, or sludge buildup prevents adequate oil reaching main and big-end bearings.
- Bearing wear cascade: Once bearing shells begin wearing, clearance increases, oil pressure drops, and heat generation accelerates — creating a self-reinforcing failure cycle.
- Manufacturing tolerances: Early 306DT engines had marginal journal surface finish specifications. Combined with extended 20k-mile service intervals, this accelerated wear rates.
- UK driving patterns: Short urban journeys prevent oil reaching optimal temperature for contaminant evaporation. Fuel dilution and soot loading degrade oil film strength, increasing metal-to-metal contact risk.
Technical Reference
Land Rover Technical Bulletin LTB00473 acknowledges crank bearing failure patterns on 3.0L diesel engines and recommends reduced service intervals for vehicles operating in severe conditions (including typical UK urban use).
Our Crankshaft Repair Process
Proper crankshaft repair requires complete engine removal and precision measurement. We always pursue the most cost-effective viable repair first — regrinding where possible, replacement only when necessary.
1
Diagnostic Confirmation
Oil pressure test at multiple RPM points, borescope inspection via sump drain to check for debris, and oil filter analysis for metallic particles. Confirms crank/bearing failure before engine removal.
2
Engine Removal & Strip-Down
Full engine extraction using OEM-approved hoists. Complete disassembly in cleanroom environment. Crankshaft extracted and all journals measured with digital micrometers to 0.001mm tolerance.
3
Crank Assessment & Machining
If journals are within regrind limits, crankshaft is precision-ground to next undersize specification by our machining partner. If beyond limits, replaced with new OEM-spec crankshaft. Crack testing performed on all reground units.
4
Component Replacement
New bearing shells matched to regrind size (Glyco/King OEM-grade), new oil pump (mandatory), new timing chain kit, all gaskets and seals. No reused wear components.
5
Reassembly & Verification
Precision reassembly with calibrated torque tools. Oil pressure verified at idle, 2000rpm, and 3000rpm before refit. ECU adaptation reset. 50-mile road test with live oil pressure monitoring throughout.
We always quote the repair option first. Replacement is only recommended if the crank is beyond safe regrinding limits or shows cracking/runout outside OEM tolerance.
Get Your Fixed QuoteCrankshaft Repair Pricing
Transparent pricing confirmed after strip-down assessment. Regrind repairs cost significantly less than full replacement — we pursue the viable lower-cost option first.
SDV6 / TDV6 Crankshaft Repair
Complete engine-out repair inc. all parts & labour
£2,500 – £4,500
Inc. VAT
- Full engine strip-down and inspection
- Crankshaft regrind OR replacement (depending on condition)
- New OEM-grade bearing shells (matched to crank size)
- New oil pump (mandatory with crank work)
- New timing chain kit, gaskets, and seals
- Diagnostics, ECU reset, and 50-mile road test
- 12-month unlimited mileage warranty
- Free collection & return (mainland UK)
Price disclaimer: Prices are estimates for standard crankshaft repair on a serviceable SDV6/TDV6 engine. Lower range (£2,500–£3,200) typically applies to regrind repairs; upper range (£3,500–£4,500) applies where new crankshaft replacement is required. Final fixed quote provided after strip-down inspection. VAT is included. If the engine block is also damaged (scored bearing caps, spun bearings damaging housing), a full engine rebuild or replacement may be necessary — we will advise and quote separately before proceeding. Part numbers vary by VIN and build date.
Why Choose JLR Engine Specialists for Crankshaft Repair?
In-House Machining Partner
Direct access to precision crank grinding facilities maintaining OEM undersize tolerances. Faster turnaround and tighter quality control than outsourcing to general machine shops.
OEM-Spec Bearing Shells
We use Glyco, King, or equivalent tier-one bearing suppliers — never cheap pattern parts with unknown metallurgy. Correct bearing selection is critical to crank longevity.
12-Month Unlimited Mileage Warranty
All crankshaft repairs covered for 12 months regardless of mileage. Parts and labour included. Full terms at /warranty.
Nationwide Collection & Delivery
Based in Billericay but serving the entire UK. Enclosed transport available for non-drivable vehicles. Return tested and warranted.
Repair-First Philosophy
We always assess regrind viability before recommending replacement. Saves customers £1,000–£2,000 where the crank is still within safe machining limits.
Related Reading
Technical articles covering SDV6/TDV6 failure patterns and prevention. Written by our specialists based on real workshop data.
TDV6 Crankshaft Failure Symptoms
Early warning signs, diagnostic steps, and what repair looks like.
SDV6 Turbo Failure Prevention
Oil starvation from crank debris kills turbos too. Protect both systems.
Top 10 Most Expensive Range Rover Engine Failures
Including crankshaft neglect — and how early intervention saves thousands.
Related Service Pages
Frequently Asked Questions
Direct answers to the most common questions about SDV6/TDV6 crankshaft repair.
Yes — if caught early. Crankshaft regrinding to an undersize specification is viable when journals are within machining limits and show no cracking or excessive runout. This costs significantly less than full engine replacement. However, if the block is damaged or the crank is beyond safe limits, replacement or full rebuild becomes necessary. We assess viability after strip-down and always quote the lowest viable option first.
Typically £2,500–£4,500 including VAT, depending on whether regrind or new crank replacement is required. The lower end applies to regrind repairs; the upper end applies when a new OEM-spec crankshaft is needed. This includes all bearings, oil pump, timing chain kit, gaskets, labour, diagnostics, and 12-month warranty. Main dealer quotes for equivalent work regularly exceed £7,000.
The earliest sign is typically a faint metallic tap on cold start that disappears as oil pressure builds. As wear progresses, this develops into a louder knock under load, low oil pressure warnings at idle, and eventually vibration through the drivetrain. Metallic particles in the oil filter during routine servicing can also indicate early-stage bearing wear before audible symptoms develop.
Typically 5–7 working days from drop-off to collection. This accounts for engine removal, strip-down, crank assessment/machining (including external regrind turnaround time), reassembly, and mandatory road testing with oil pressure verification. Rush jobs compromise precision — we do not cut corners on crank work.
Usually not. A quality reconditioned SDV6/TDV6 engine typically costs £4,500–£6,500 fitted. Crankshaft repair at £2,500–£4,500 saves £1,000–£3,000 while retaining your original matching-numbers engine. Replacement only becomes more economical if the block is cracked, bearing housings are damaged, or multiple other failures (turbo, injectors, head) coincide. We provide honest comparative quotes when both options are viable.
Yes. All crankshaft repairs include a 12-month unlimited mileage warranty covering parts and labour. If any component we fitted fails or related symptoms recur within that period, we rectify at zero cost. Full terms available at /warranty.
No. Even a slight knock indicates bearing clearance has already exceeded safe limits. Continued operation accelerates wear exponentially and risks sudden crank seizure or fracture — turning a £3,000 repair into a £6,000+ engine replacement. Arrange recovery or collection immediately. The cost of recovery is negligible compared to the cost of ignoring the symptom.
It significantly reduces risk. JLR's original 20,000-mile/24-month interval is widely considered too long for UK driving conditions. We recommend 10,000-mile/12-month oil changes using correct specification synthetic oil. This maintains oil film strength, reduces soot loading, and allows earlier detection of emerging issues through oil analysis. See our servicing page for recommended intervals.
Hearing Bottom End Knock?
Don't wait for seizure. Call 0203 488 4649 or WhatsApp 07975 827 396 for urgent assessment. We'll confirm whether crankshaft repair is viable and provide a fixed quote before any work begins. Nationwide collection available for non-drivable vehicles.