The OVS on the Alfa has been a well discussed topic on the ALFA Bulletin Board. Apparently it is a component that is subject to failure, although in fairness, I don’t expect that Alfa engineers ever expected this part to last over thirty years! The part is susceptible to corrosion – often suffering pin hole leaks, rotted out internals and clogged lines.
Richard Lesniewicz aka “divotandtralee” a contributor to the Bulletin Board, studied the problem and designed and partially manufactured a replacement for the original unit. The new OVS is entirely brass and Richard machined the individual components of the assembly and sold them as a kit to be assembled by the purchaser. “Assembly” in this case is primarily soldering. The new OVS is almost identical in size to the original and once painted black will be almost indistinguishable once mounted in the engine bay.
Richard sketched the OVS to first demonstrate how it functions and then to show what happens to it after extended use:
This is a link to his instructions for assembly and use:OVS Construction Instructions
It is important to align the tubes off of the primary canister in the same fashion as the original OVS. Since that is still on the car, I will wait until I remove it to complete the “construction” of the brass OVS. The following image shows my progress to date: