ERR7146 | 300TDI Front Timing Cover – Defender, Discovery 1 & RRC
Replacement front timing cover for Land Rover 300TDI engines, fitting Defender, Discovery 1 and Range Rover Classic. This cover sits over the timing belt area and is the correct replacement part where the existing front cover is damaged, corroded or no longer sealing properly.
- Fits Defender 300TDI; Discovery 1 300TDI; Range Rover Classic 300TDI
- Front outer timing cover for the 300TDI engine
- Original part number references: ERR7146 and ERR4578
£169.45 inc. UK VAT
Available from secondary stock — usually within 24 hours
Family-run Land Rover parts specialist supplying Genuine, OEM & trusted aftermarket parts.
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300TDI front timing cover replacement
This front timing cover is for Land Rover 300TDI engines fitted to Defender, Discovery 1 and Range Rover Classic models. It covers the timing belt area at the front of the engine and is replaced when the original cover is damaged, badly corroded, distorted or no longer sealing correctly. Original part number references include ERR7146 and ERR4578.
Common reasons for replacement include oil leaks around the timing case, physical damage to the cover, previous poor repairs, corrosion around sealing faces, or damage found during timing belt work. If the cover has been removed, the sealing parts should be inspected before refitting.
When fitting the cover, renew the ERR7293 300TDI timing cover gasket and check the ERR2344 front cover sealing washer. If there is oil inside the timing case, the ERR4575G front crankshaft oil seal is also worth checking while the area is apart.
If the timing belt is due or the front cover is being removed as part of a larger timing job, see the STC4096LG 300TDI timing belt kit with Dayco belt and INA bearings.
| Weight | 3 kg |
|---|---|
| Dimensions | 60 × 40 × 20 cm |
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Twinwoods 4x4 ships Land Rover parts across the UK and around the world. We regularly send parts overseas and use trusted tracked courier services so UK and international customers can order with confidence.
Standard UK shipments are normally sent with DPD. UK orders containing oils or fluids are normally sent with DHL where required, because some carriers restrict liquid shipments.
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- Changed your mind? Tell us within 14 days of delivery. You then have a further 14 days to return the goods.
- Return carriage and safe packing are your responsibility for change-of-mind returns.
- Managed UK returns: where suitable, we can provide a cost-effective, hassle-free tracked return service with straightforward drop-off, proof of handover and tracking linked to your return. The cost will be advised before it is arranged and may be deducted from your refund.
- Change-of-mind returns must be returned complete, in their original packaging and in resaleable condition. Returned goods must be the same goods supplied by us and complete with all components, accessories and any free or promotional items supplied with them.
- Please do not fit or attempt to fit a part unless you intend to keep it. Fitting, attempted fitting, contamination, damage, missing packaging or excessive handling can substantially reduce the value of the goods and may result in a corresponding reduction to your refund.
- Faulty, damaged or incorrectly described? Contact us first. We will advise the appropriate return method and will normally provide a prepaid return service or cover reasonable agreed return costs.
Returns – quick FAQs
How long do I have to return an item?
Who pays return carriage?
What condition must a change-of-mind return be in?
Fitting, attempted fitting, contamination, damage, missing packaging or excessive handling can substantially reduce the value of the goods and may result in a corresponding reduction to your refund.
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. We do not operate a used-parts or bargain-bin section, so a fitted or damaged part can have very little resale value.
Where your handling has reduced the value of the goods beyond what is reasonably necessary to inspect them, your refund may be reduced to reflect that loss in value.
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Are any items excluded from change-of-mind returns?
How do I start a return?
Please include your order number and a brief reason for the return. Do not send anything back until you have received the appropriate return instructions.
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.
This warranty is in addition to your legal rights and does not reduce those rights.
For full details, please see our Terms and Conditions.

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