Range Rover 4.4 SDV8 engine rebuild cost depends mainly on what failed and how far the damage spread. Worn rear timing chains caught early are a very different job from a bearing failure that has scored the crankshaft or sent debris through the oil system. Beyond that, the cost depends on the machining needed, which parts are replaced, the condition of the twin turbos and oil cooler and the labour to remove and refit a large V8. Every SDV8 rebuild has to be quoted after diagnosis and inspection. This guide explains what drives the price and what your written quote should include.
What an SDV8 Rebuild Involves
The 4.4-litre V8 diesel (448DT) was fitted to the Range Rover L322 as the TDV8 from about 2010, then as the SDV8 in the L405 Range Rover and L494 Range Rover Sport. It has twin turbos and timing chains at the rear of the engine, against the gearbox. Any rebuild that involves the chains or the bottom end means removing the engine.
A rebuild means stripping your own engine, measuring each critical part against factory tolerances, machining or replacing what is out of specification and reassembling it with new wear parts. Your original engine number stays with the car.
Typical Rebuild Scope
Stage | What happens |
| Diagnosis | Fault codes, live data and oil inspection to confirm the fault |
| Removal and strip-down | Engine removed, dismantled and cleaned |
| Inspection and measurement | Crank, bearings, bores, liners, heads and chains measured |
| Machining | Cylinder heads skimmed where needed. Crankshaft reground or replaced |
| Parts | Bearings, gaskets and seals, plus timing chains, guides and tensioners |
| Assembly | Built to JLR torque settings and procedures |
| Testing | Compression and leak testing before refit |
| Refit | Turbos, cooling and ancillaries refitted. Fluids, coding checks and road test |
See our engine rebuild service for the full process, and our 4.4 V8 engine page for background on the SDV8.
What Decides the Cost
The Type of Damage
The single biggest factor is what has gone wrong:
- Rear timing chain wear, caught early. A rattle from the back of the engine on a cold start is the usual warning. If it is caught before the chain jumps or snaps, the work may focus on the chains, guides, tensioners and seals. Because the chains are at the rear, the engine still has to come out. Our timing chain replacement service covers this work.
- A snapped or jumped chain. On this interference engine, valves can hit the pistons. The heads, valves and pistons then need checking, and often replacing.
- Bearing failure. Big-end or main bearing failure is usually linked to oil starvation from dirty oil, a low oil level or oil diluted by diesel from DPF regeneration. Rover Spares notes that these failures are not established as common and that no manufacturing defect has been found. A failed bearing can damage the crankshaft and connecting rods and fill the oil system with debris.
- Oil pump failure. Forum owners report occasional oil pump seizures, including one L405 at about 75,000 miles that needed a new crank, pistons, liners and pump. Experienced owners describe this as uncommon rather than typical, but when it happens the damage is extensive.
Fixing the cause matters as much as fixing the damage. A rebuilt engine refitted with a contaminated oil cooler, a restricted turbo oil feed or a DPF that keeps diluting the oil can fail again.
Turbos, Oil Cooler and Ancillaries
Factor | Why it affects the cost |
| Machining | Some cranks, bores and heads can be machined, and others are beyond it |
| Major parts | Crank, pistons, liners or heads add a lot to a wear-parts-only rebuild |
| Timing kit | Chains, guides and tensioners are usually renewed as a set |
| Twin turbos | They share the oil supply, so after a debris failure they need checking or replacing |
| Oil cooler | Rover Spares lists oil cooler leaks as a known 4.4 fault. It also traps debris |
| EGR, intake and DPF | Carbon and blockages affect the rebuilt engine's health |
| Injectors | Tested, cleaned or replaced as needed |
| Labour | Removal and refitting of a large V8, plus the rebuild itself |
Our turbo replacement service checks oil supply and feed pressure before fitting a new turbo. That check matters on an SDV8 after any bearing or pump failure.
Rebuild or Replace, and Getting a Quote
A rebuild is usually right when the block and major components can be saved. If the block or liners are badly damaged, or several major parts are beyond use, a replacement engine may make more sense. Compare the full cost with the car's value and its overall condition, including the gearbox, air suspension and body. Our engine diagnostics and repair service confirms the actual fault with fault-code scans and live data before any recommendation.
What Your Written Quote Should Show
Ask each workshop for the same items in writing:
- Diagnosis: what failed and why
- Scope: which parts are machined and which are replaced
- Timing kit: whether chains, guides and tensioners on both banks are new
- Bottom end: bearings, crankshaft, rods, and pistons or liners if needed
- Turbos: what checks are made, and whether one or both are replaced
- Oil cooler and lines: cleaned or replaced after a debris failure
- EGR, DPF and injectors: what is included
- Labour: removal, rebuild and refit
- Testing: compression and leak tests before refit, plus a road test
- Extras: how further faults found during the strip-down are approved before work goes ahead
- Warranty: the written terms, including mileage and conditions
- Timescale: the estimated time for machining and parts
A low headline figure that leaves out the turbos, oil cooler or timing kit can cost more later. For an inspection and an itemised quote, contact the team or call 01708 592377.
FAQs
4.4 SDV8 Rebuild FAQs
Why can't you give a fixed price for a 4.4 SDV8 rebuild?
The cost depends on what failed, how far the damage spread and which parts need machining or replacing. These are only known after strip-down and inspection, so an itemised quote is the honest way to price it.
Does the engine have to come out to replace SDV8 timing chains?
Yes. The chains are at the rear of the engine, against the gearbox, so the engine must be removed.
Is it worth rebuilding a 4.4 SDV8?
Often, if the block and main components are sound and the rest of the car is in good condition. If the damage is extensive, a replacement may be better value. An inspection shows which applies.
Do the turbos need replacing during a rebuild?
Not always. After a bearing or oil pump failure, debris can reach the turbos through the shared oil supply, so they must be checked and are sometimes replaced.
How can I protect a rebuilt SDV8?
Change the oil on time with the correct specification, check the oil level regularly, let DPF regenerations complete with regular longer drives and investigate any cold-start rattle or warning light straight away.