TD5 Injector Seal Kit – Delphi O-Rings | ERR6417G ERR7004G
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Complete OE-quality TD5 injector seal kit assembled in-house for Defender TD5 and Discovery 2 TD5 engines. The kit contains five Delphi injector O-rings (ERR7004G) and five copper injector sealing washers (ERR6417G), giving a full set for all five injectors. Each injector uses an O-ring to seal the injector body within the cylinder head and a copper washer to seal the injector against its seat.
The two seals fail in different ways. Leakage past a copper washer can allow combustion gases around the injector seat, causing difficult starting, rough running and misfires. A failed injector O-ring can allow diesel to enter the engine oil, raising the sump level and diluting the lubricant. Both seals should be renewed whenever the injectors are removed.
Kit Contents
- 5 × Delphi injector O-rings – ERR7004G
- 5 × copper injector sealing washers – ERR6417G
Vehicle Fitment
- Defender TD5 – all models
- Discovery 2 TD5 – all models
Related Parts
Compare the available single-injector, Genuine Land Rover and complete five-injector sets in our TD5 injector seal kits section. The TD5 injector puller removes the injectors vertically from the cylinder head, while the AMR6103 TD5 injector loom is the under-rocker harness for oil-in-loom faults and injector wiring problems.
| Weight | 0.1 kg |
|---|---|
| Dimensions | 20 × 15 × 2 cm |
Brand
Delphi
Delphi Land Rover parts with a particularly strong range of brake pads, brake discs and hydraulic components, plus steering and suspension joints, clutch cylinders, fuel filtration and the OE-quality TD5 MAF sensor.
Delphi is one of the brands we use most heavily for standard Land Rover brake replacements. Match the part number and vehicle fitment carefully, particularly where brake sizes, solid or vented discs, axle position, thread direction or early and late caliper types differ.
Delphi parts for Defender, Discovery and Range Rover
Braking forms the largest part of our Delphi range, with pads, discs, transmission brake shoes and hydraulic components covering Defender, Discovery and Range Rover models. Delphi also supplies several of the steering, suspension, clutch and engine-management parts we are happy to use and support.| Product group | Delphi parts available | Check before ordering |
|---|---|---|
| Braking | Brake pads, brake discs, transmission brake shoes and brake master cylinders | Vehicle, front or rear axle, disc diameter, solid or vented discs and caliper type |
| Steering and suspension | Track rod ends, anti-roll bar drop links and front axle ball joints | Left-hand or right-hand thread, axle position, original part number and whether an individual joint or complete kit is required |
| Engine management | OE-quality TD5 mass air flow sensor for Defender TD5 and Discovery 2 TD5 | Engine and original part number, including MHK100620 fitment |
| Clutch hydraulics | Clutch master and slave cylinders for selected Defender and Series models | Vehicle, engine, gearbox and original cylinder part number |
| Fuel filtration | Diesel fuel filters for Series and early Defender models | Engine, filter arrangement and replacement part number |
Why we stock Delphi
Delphi is an established automotive manufacturer with a long OE engineering background across braking, steering and suspension, engine management and fuel systems. That experience makes Delphi a strong brand for safety-critical and electronically sensitive parts where accurate manufacture and consistent performance matter. The TD5 mass air flow sensor is an important example. Delphi manufactures its aftermarket MAF sensors from new components and calibrates them to reproduce the accurate airflow readings required by the engine management system. Our Delphi MHK100620G sensor is the recommended OE-quality replacement for Defender TD5 and Discovery 2 TD5.Check Delphi part fitment before ordering
Related Land Rover parts sections
| Section | Use it for |
|---|---|
| Defender brake parts | Defender brake pads, discs, calipers, hydraulic components and transmission brake parts |
| Discovery 1 braking system | Discovery 1 brake discs, pads and related braking components |
| Discovery 2 brake parts | Discovery 2 front and rear brake pads, discs and transmission brake components |
| Discovery 4 brake parts | Discovery 4 brake pads and discs split by axle position and disc size |
| Defender steering parts | Track rod ends, steering joints, steering bars and related components |
| Defender TD5 engine sensors | MAF sensors and other engine-management sensors for Defender TD5 |
| Discovery 2 TD5 engine sensors | MAF sensors and related engine-management components for Discovery 2 TD5 |
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How long do I have to return an item?
For UK and EEA consumers, statutory change-of-mind cancellation rights also apply: tell us within 14 days of receiving your order, then return the goods within the following 14 days.
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Is there a charge for an extended return?
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What condition must an extended return be in?
Can I fit a part and then return it?
Once a part has been fitted or an attempt has been made to fit it, it may be marked, contaminated, damaged or otherwise unsuitable for resale as a new part. Fitted or used goods will not normally qualify for our voluntary extended returns policy.
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What if the item is faulty?
Are any items excluded from 60-day returns?
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Buy with confidence: all new parts sold by Twinwoods 4x4 include at least 12 months manufacturer warranty against defects in materials and workmanship under normal use.
Some products and brands may include a longer warranty period where this is provided by the manufacturer. Where applicable, this will normally be stated on the individual product page or covered by the manufacturer’s own warranty terms.
Warranty cover applies to manufacturing defects. It does not cover misuse, incorrect fitting, competition use unless stated, contamination, modification, damage during installation, normal wear and tear, or failure caused by an unrelated vehicle fault. For certain components, proof of professional fitment may be required.
Warranty claims may require the part to be returned for inspection and/or supplier testing before the claim is accepted. Any advance replacement is discretionary.
Warranty remedies relate to the part itself, meaning repair or replacement, or refund if those are not possible. Warranty does not cover labour, removal or refitting, diagnostics, consumables, travel or other incidental costs.
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For full details, please see our Terms and Conditions.




Verified owner John Lee (verified owner) –
Great service and fast delivery. It is good to be able to get better quality parts as opposed to the sometimes inferior parts from other dealers. 10/10