Mporium CNC Machined VANOS adjuster cover caps for S65 V8 M3 engines.
This listing is for 1 set of 4 caps to service one S65 engine.
Our design is simple but unique when compared to clip-on solutions in that our VANOS "cup" is held completely captive under the VANOS’ central bolt. It is impossible for it to come loose or come apart. A captive design is preferable for long term reliability as it leaves no chance that it can come loose, vibrate free, or fatigue and fail as has been observed with clip-on caps or the factory plastic covers. More refined than oversize washer discs, our "cup" design fully encompasses the VANOS spring in a more streamlined OE fashion. We believe our solution is the best option available for this application and is ideally installed during engine assembly or top-end work such as camshaft replacement or valve cover service.
PRODUCT DETAIL:
Original design only from Mporium.
CNC lathe cut from hardened Chromoly steel.
Replaces original plastic cover AND central bolt washer.
Does not interfere with factory internal parts or valve covers
Inherently prone to perfect balance due to precision center bore interface with central bolt.
*Customized laser engraving is available*.
WHY IS THIS PART IMPORTANT?
The original adjusters have a plastic cap which serves a simple function- to cover and retain the adjuster’s coil spring. This spring helps returns the cam position to its end point when oil pressure is absent so that it may lock in place for correct startup timing. It also serves to buffer and smooth cam movement when in operation and augment adjustment performance against cam drag in timing advancement. It is important to maintain this spring’s function.
As these engines age and the original VANOS adjuster plastic caps become brittle and fall apart, this causes several critical concerns. Most obvious is the debris from the original caps falling into the oil sump and causing blockage of the oil pump pickups. In the worst cases this can cause oil starvation and engine failure. With the cap covers missing from the VANOS adjusters, the springs are no longer retained properly against the adjuster body and risk “walking” forward on their locating pins and eventually coming free. This may not always result in faults or obvious running issues but has been proven to be the cause of broken internal VANOS rotors and spring contact with the engine timing case and valve cover which results in additional metal shavings being introduced into the engine. It is critical to maintain spring retention and unfortunately these plastic caps are not available separately from BMW.
*Customized laser engraving is also available for FREE. This is often requested if you’re installing custom cams and want the specifications engraved. We must be notified via email at the time your order is placed in order to process engraving requests.
NOTE:
This permanent fix requires releasing the VANOS central bolts with the cams locked while at #1 TDC. Timing must be checked after installation, and we recommend considering this upgrade during renewal or replacement of the valve covers or other top-end work. Luckily, the S65 is one of the easiest BMW ///M engines in which to set cam timing. However, due to the tooling required and potential for damage, this job is recommended for professional mechanics and Mporium is not liable for damage caused by incorrect installation.