However, with care, both areas can be accessed with a hypodermic syringe. On the exhaust facing, the area is visible, but it is very hard to access because the valve stem guide is in the way. ![]() On the intake valve facing, this area is not visible to the naked eye because it is covered by the force-fit brass collar and a round piece of thin pneumatic cloth or leather. ![]() ![]() The most common point of leakage in a Standard valve is where the valve facing and the valve stem contact each other. And while I in no way endorse the following "repair" technique as a panacea for deteriorating valves, it will improve performance in the vast majority of cases. While all professional rebuilders know that replacing 80+ year old valves is a must, many novices have neither the patience, tools, nor the knowledge to do the job successfully on their first (and possibly last) try. (See IMPORTANT ADDITIONAL INFORMATION and DISCLAIMER below.)Īs the number of Do-It-Yourself rebuilders increases, so do the phone calls I get about leaking Standard Valves. However, you do have to remove the tiers from the valve board. It can be done with the valves in the chest. This repair technique does not require the removal of the valves. VERY IMPORTANT NOTE: Do not remove the valves from the chest. Tips and Tricks - Sealing Standard Valves.
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