Wednesday, December 11, 2013
Should I Use Umbrella or O Ring Valve Seals
Umbrella Seals Cut Down on Oil Seepage
An umbrella seal scrapes against the valve stem and guide as they are moving. This can mean less oil getting through and less blue smoke on engine startup. These valves are a traditional style and are particularly popular on older cars and rebuilds. Some engines do not have room for umbrella seals.
O-Rings Diminish Excess Oil
O-rings do not scrape the valve stem clear of oil, but they do stop excess oil from falling into the combustion chamber after the engine is shut off. Some people feel this allows the guide and valve stem to remain properly lubricated.
Bottom Line
In an older vehicle or one with worn valve stems, an umbrella seal may help reduce engine smoke without an entire engine rebuild. More important is to get seals made of silicone or other advanced materials. Older seals and cheaper seals are made of nitrite, which corrodes quickly.
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