Oil Relief Valve Washer, Sold Each

OVERVIEW

Precision is everything when it comes to maintaining the oiling system of an air-cooled Volkswagen. The EMPI Oil Relief Valve Washer is a critical, though often overlooked, component in ensuring your engine maintains consistent oil pressure and remains free of unsightly leaks. This high-quality crush washer is designed specifically to seal the oil relief valve plug against the engine case. In the high-vibration and extreme thermal environment of a flat-four engine, a standard hardware store washer simply won''t cut it. These washers are engineered to compress slightly upon installation, creating a liquid-tight barrier that prevents pressurized oil from weeping out of the relief galleries. Whether you are performing a routine oil change or a complete bottom-end rebuild, replacing this washer is a non-negotiable step for any serious VW enthusiast or professional mechanic.

At Appletree Auto, we know that the longevity of your Beetle, Bus, or Ghia depends on the integrity of its lubrication system. The oil relief valve serves as the traffic controller for your engine''s oil flow, bypassing the cooler when the oil is cold or thick and regulating pressure to prevent damage to the oil cooler. If the plug sealing this system is compromised by a deformed or reused washer, you risk not only a messy driveway but also a potential drop in oil pressure that can lead to catastrophic internal wear. This EMPI washer, part number N138174, provides the exact tolerances required to mate the steel plug to the magnesium or aluminum alloy case without damaging the delicate threads. Don''t let a two-dollar part stand between you and a reliable engine; stock up on these essential gaskets to ensure every seal on your air-cooled powerplant is as robust as the day it left the factory in Wolfsburg.

FITMENT

This oil relief valve washer is designed for Type 1 based engines and is compatible with the following vehicles and years:

• Volkswagen Beetle: 1954 through 1977 (Standard Models)
• Volkswagen Super Beetle: 1971 through 1979
• Volkswagen Karmann Ghia: 1956 through 1974
• Volkswagen Bus (Type 2): 1954 through 1971 (1200cc, 1500cc, and 1600cc engines)
• Volkswagen Type 3 (Squareback, Fastback, Notchback): 1962 through 1973
• Volkswagen Thing (Type 181): 1973 through 1974
• Dune Buggies and Sand Rails: All models utilizing Type 1 VW engine cases

SPECS

• Manufacturer: EMPI
• Part Number: N138174
• Material: High-grade Aluminum alloy for optimal compression and sealing
• Inside Diameter: Sized for M18 oil relief valve plugs
• Application: Oil Relief Valve Plug and Oil Control Valve Plug
• Quantity: Sold Each (Note: Dual relief cases require two washers)
• Compatibility: Fits stock and aftermarket VW engine cases (AS41, AS21)

PRO TIPS

1. Always Inspect the Plug Face and Case Surface

Before installing your new EMPI washer, it is vital to inspect the mating surfaces of both the oil relief plug and the engine case. Over years of service, the case surface can become pitted or scarred, and the plug itself can develop a ridge from previous over-tightening. Use a lint-free cloth and a bit of solvent to clean the area thoroughly. If you notice any significant burrs on the plug, it is best to replace the plug entirely along with the washer. A clean, flat surface is the only way to ensure that the aluminum washer crushes evenly and provides a 100% leak-proof seal. Remember, even the best washer cannot compensate for a damaged engine case or a warped plug.

2. Observe Proper Torque Specifications

One of the most common mistakes in air-cooled VW maintenance is over-tightening the oil relief valve plug. Because the engine case is made of a relatively soft magnesium or aluminum alloy, it is very easy to strip the threads if you apply too much leverage. The factory torque specification for the oil relief plug is approximately 30 ft-lbs (4.0 mkg). Using a calibrated torque wrench ensures that the washer is compressed sufficiently to seal without putting undue stress on the case threads. If you feel the plug "give" or get easier to turn while tightening, stop immediately, as this is a sign that the threads are failing. Using a fresh washer every time allows you to achieve a perfect seal at the correct torque without over-stressing the metal.

3. Verify Your Case Type: Single vs. Dual Relief

It is essential to know whether your engine is a single-relief or a dual-relief design before starting your project. Early 1200cc, 1300cc, and some 1500cc engines feature a single oil relief valve located near the flywheel side of the case. However, most 1600cc engines and late-model replacement cases are "dual-relief," meaning they have a second valve located near the oil pump. If you are doing a full service or a rebuild on a dual-relief case, you must order two of these washers (N138174) to ensure both plugs are sealed correctly. Mixing an old, hardened washer with a new one is a recipe for a persistent leak on the underside of your engine that can be difficult to trace later.