ERR3424 Rocker Cover Bolt Washer 300Tdi Defender D1 RRC
The 300Tdi engine found across the Defender, Discovery 1, and Range Rover Classic is one of the most enduring and well-regarded diesel powerplants Land Rover ever produced, and like any engine, it depends on a complete set of properly functioning seals and gaskets to stay leak-free. The rocker cover, which sits on top of the cylinder head and encloses the valve train, is secured by three bolts, and each of those bolts passes through a combined sealing and retaining washer. Part number ERR3424 is that washer, and its job is to create an oil-tight seal between the bolt head and the rocker cover surface while also acting as a retaining element that holds the bolt captive in the cover.
Over time and through repeated heat cycles, these washers harden, compress, and lose their sealing ability. The result is typically a minor but persistent oil weep from one or more of the three rocker cover bolt positions, often visible as an oily residue along the side of the engine or a faint smell of burning oil from the engine bay. Because the fix is so straightforward and the part is so inexpensive, this is one of the most cost-effective sealing jobs on the entire 300Tdi engine. Three washers are required per engine, one for each rocker cover bolt position, and best practice is to replace all three at the same time rather than addressing only the one that appears to be leaking.
Replacement requires removing the rocker cover, which on the 300Tdi is a manageable job for any owner with basic mechanical aptitude. While the cover is off, it is worth inspecting the rocker cover gasket itself, as the two components share the same service interval and the gasket is often replaced at the same time. The washers simply push onto the bolts and are held in place by the bolt head, requiring no adhesives, sealants, or special tools to install correctly.
This listing is priced per individual washer. If you require a full set of three to complete a rocker cover reseal, please add the appropriate quantity to your cart. ERR3424 fits every 300Tdi engine regardless of which model it is fitted to, making it a universal service item across the Defender L316, Discovery 1 L316, and Range Rover Classic models equipped with this engine.
Fits:
Defender 90 L316 (1994 to 1998) 2.5-liter 300Tdi Diesel
Defender 110 L316 (1994 to 1998) 2.5-liter 300Tdi Diesel
Defender 130 L316 (1994 to 1998) 2.5-liter 300Tdi Diesel
Discovery 1 L316 (1994 to 1998) 2.5-liter 300Tdi Diesel
Range Rover Classic (1994 to 1995) 2.5-liter 300Tdi Diesel
Part Number: ERR3424
Free shipping to the lower 48!
No supersessions found.
[FAQ]
How many ERR3424 washers does a 300Tdi engine require?
Each 300Tdi engine uses three rocker cover bolts, and each bolt requires one ERR3424 sealing washer. That means three washers are needed for a complete rocker cover reseal. This listing is priced per individual washer, so customers replacing a full set should add three units to their cart. Most experienced owners replace all three at the same time rather than only the washer that appears to be leaking, as the remaining washers are at the same age and service life and the incremental cost of doing all three is minimal.
What are the signs that the ERR3424 sealing washer needs replacing?
The most common symptom is a slow oil weep or seep from one or more of the rocker cover bolt locations on top of the engine. This typically appears as an oily film or residue around the bolt heads on the rocker cover, and may produce a faint burning oil smell if oil contacts hot engine surfaces nearby. On the 300Tdi, this is a very common and well-understood maintenance item rather than a sign of serious engine trouble, and it is resolved simply by replacing the washers and reseating the rocker cover with a fresh gasket if needed.
Can I replace the ERR3424 washers without removing the entire rocker cover?
No. Access to the rocker cover bolts requires removing the rocker cover itself, as the washers sit under the bolt heads on the top face of the cover. The cover removal process on the 300Tdi is straightforward and involves disconnecting the breather hose, removing the bolts, and lifting the cover clear of the head. With the cover off, it is good practice to inspect the rocker cover gasket at the same time, as both components are inexpensive and share the same access procedure.
The 300Tdi engine found across the Defender, Discovery 1, and Range Rover Classic is one of the most enduring and well-regarded diesel powerplants Land Rover ever produced, and like any engine, it depends on a complete set of properly functioning seals and gaskets to stay leak-free. The rocker cover, which sits on top of the cylinder head and encloses the valve train, is secured by three bolts, and each of those bolts passes through a combined sealing and retaining washer. Part number ERR3424 is that washer, and its job is to create an oil-tight seal between the bolt head and the rocker cover surface while also acting as a retaining element that holds the bolt captive in the cover.
Over time and through repeated heat cycles, these washers harden, compress, and lose their sealing ability. The result is typically a minor but persistent oil weep from one or more of the three rocker cover bolt positions, often visible as an oily residue along the side of the engine or a faint smell of burning oil from the engine bay. Because the fix is so straightforward and the part is so inexpensive, this is one of the most cost-effective sealing jobs on the entire 300Tdi engine. Three washers are required per engine, one for each rocker cover bolt position, and best practice is to replace all three at the same time rather than addressing only the one that appears to be leaking.
Replacement requires removing the rocker cover, which on the 300Tdi is a manageable job for any owner with basic mechanical aptitude. While the cover is off, it is worth inspecting the rocker cover gasket itself, as the two components share the same service interval and the gasket is often replaced at the same time. The washers simply push onto the bolts and are held in place by the bolt head, requiring no adhesives, sealants, or special tools to install correctly.
This listing is priced per individual washer. If you require a full set of three to complete a rocker cover reseal, please add the appropriate quantity to your cart. ERR3424 fits every 300Tdi engine regardless of which model it is fitted to, making it a universal service item across the Defender L316, Discovery 1 L316, and Range Rover Classic models equipped with this engine.
Fits:
Defender 90 L316 (1994 to 1998) 2.5-liter 300Tdi Diesel
Defender 110 L316 (1994 to 1998) 2.5-liter 300Tdi Diesel
Defender 130 L316 (1994 to 1998) 2.5-liter 300Tdi Diesel
Discovery 1 L316 (1994 to 1998) 2.5-liter 300Tdi Diesel
Range Rover Classic (1994 to 1995) 2.5-liter 300Tdi Diesel
Part Number: ERR3424
Free shipping to the lower 48!
No supersessions found.
[FAQ]
How many ERR3424 washers does a 300Tdi engine require?
Each 300Tdi engine uses three rocker cover bolts, and each bolt requires one ERR3424 sealing washer. That means three washers are needed for a complete rocker cover reseal. This listing is priced per individual washer, so customers replacing a full set should add three units to their cart. Most experienced owners replace all three at the same time rather than only the washer that appears to be leaking, as the remaining washers are at the same age and service life and the incremental cost of doing all three is minimal.
What are the signs that the ERR3424 sealing washer needs replacing?
The most common symptom is a slow oil weep or seep from one or more of the rocker cover bolt locations on top of the engine. This typically appears as an oily film or residue around the bolt heads on the rocker cover, and may produce a faint burning oil smell if oil contacts hot engine surfaces nearby. On the 300Tdi, this is a very common and well-understood maintenance item rather than a sign of serious engine trouble, and it is resolved simply by replacing the washers and reseating the rocker cover with a fresh gasket if needed.
Can I replace the ERR3424 washers without removing the entire rocker cover?
No. Access to the rocker cover bolts requires removing the rocker cover itself, as the washers sit under the bolt heads on the top face of the cover. The cover removal process on the 300Tdi is straightforward and involves disconnecting the breather hose, removing the bolts, and lifting the cover clear of the head. With the cover off, it is good practice to inspect the rocker cover gasket at the same time, as both components are inexpensive and share the same access procedure.
Original: $10.91
-65%$10.91
$3.82Description
The 300Tdi engine found across the Defender, Discovery 1, and Range Rover Classic is one of the most enduring and well-regarded diesel powerplants Land Rover ever produced, and like any engine, it depends on a complete set of properly functioning seals and gaskets to stay leak-free. The rocker cover, which sits on top of the cylinder head and encloses the valve train, is secured by three bolts, and each of those bolts passes through a combined sealing and retaining washer. Part number ERR3424 is that washer, and its job is to create an oil-tight seal between the bolt head and the rocker cover surface while also acting as a retaining element that holds the bolt captive in the cover.
Over time and through repeated heat cycles, these washers harden, compress, and lose their sealing ability. The result is typically a minor but persistent oil weep from one or more of the three rocker cover bolt positions, often visible as an oily residue along the side of the engine or a faint smell of burning oil from the engine bay. Because the fix is so straightforward and the part is so inexpensive, this is one of the most cost-effective sealing jobs on the entire 300Tdi engine. Three washers are required per engine, one for each rocker cover bolt position, and best practice is to replace all three at the same time rather than addressing only the one that appears to be leaking.
Replacement requires removing the rocker cover, which on the 300Tdi is a manageable job for any owner with basic mechanical aptitude. While the cover is off, it is worth inspecting the rocker cover gasket itself, as the two components share the same service interval and the gasket is often replaced at the same time. The washers simply push onto the bolts and are held in place by the bolt head, requiring no adhesives, sealants, or special tools to install correctly.
This listing is priced per individual washer. If you require a full set of three to complete a rocker cover reseal, please add the appropriate quantity to your cart. ERR3424 fits every 300Tdi engine regardless of which model it is fitted to, making it a universal service item across the Defender L316, Discovery 1 L316, and Range Rover Classic models equipped with this engine.
Fits:
Defender 90 L316 (1994 to 1998) 2.5-liter 300Tdi Diesel
Defender 110 L316 (1994 to 1998) 2.5-liter 300Tdi Diesel
Defender 130 L316 (1994 to 1998) 2.5-liter 300Tdi Diesel
Discovery 1 L316 (1994 to 1998) 2.5-liter 300Tdi Diesel
Range Rover Classic (1994 to 1995) 2.5-liter 300Tdi Diesel
Part Number: ERR3424
Free shipping to the lower 48!
No supersessions found.
[FAQ]
How many ERR3424 washers does a 300Tdi engine require?
Each 300Tdi engine uses three rocker cover bolts, and each bolt requires one ERR3424 sealing washer. That means three washers are needed for a complete rocker cover reseal. This listing is priced per individual washer, so customers replacing a full set should add three units to their cart. Most experienced owners replace all three at the same time rather than only the washer that appears to be leaking, as the remaining washers are at the same age and service life and the incremental cost of doing all three is minimal.
What are the signs that the ERR3424 sealing washer needs replacing?
The most common symptom is a slow oil weep or seep from one or more of the rocker cover bolt locations on top of the engine. This typically appears as an oily film or residue around the bolt heads on the rocker cover, and may produce a faint burning oil smell if oil contacts hot engine surfaces nearby. On the 300Tdi, this is a very common and well-understood maintenance item rather than a sign of serious engine trouble, and it is resolved simply by replacing the washers and reseating the rocker cover with a fresh gasket if needed.
Can I replace the ERR3424 washers without removing the entire rocker cover?
No. Access to the rocker cover bolts requires removing the rocker cover itself, as the washers sit under the bolt heads on the top face of the cover. The cover removal process on the 300Tdi is straightforward and involves disconnecting the breather hose, removing the bolts, and lifting the cover clear of the head. With the cover off, it is good practice to inspect the rocker cover gasket at the same time, as both components are inexpensive and share the same access procedure.
