ZERO DRAG SEALS

qwikboat created the topic: ZERO DRAG SEALS

The seals are new and they are leaking.....How do I fix them...? ???
#2005

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Scott replied the topic: Re: ZERO DRAG SEALS


ALL the brass insert type zero drags seals leak a small amount ... Just some wetness around them really.

** Because zero drag seals are ZERO CONTACT with crankshaft, NO physical seal is actually made, but instead seal by being VERY close too the same diameter.

Do note however that seals can wear out VERY QUICKLY if installed crooked, or crank has excessive run out from being bent out of alignment.

Scott

2 stroke Engine Tech of 30+ years, Prop tweeker, Chronic tinkerholic, Home of Motor Heads RC Racing Engines ...
8 time NAMBA National 6 lap heat racing record holder.
#2006

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qwikboat replied the topic: Re: ZERO DRAG SEALS

Will the oil in the fuel help seal them......
#2007

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marc replied the topic: Re: ZERO DRAG SEALS

As Scott said, they are non-contact and seal only because of tight tolerances. I have had bad luck with some. I would suggest getting some new ones from a well known manufacturer and replacing them. They are fairly inexpensive. CC Racing have some good ones that I know. Also, if your crank runout is more than 2mil expect leakage, and this is fairly common. If you don't know how to check and/or adjust runout, I would recommend either getting new regular seals and forgetting about the zero drag seals, or sending the engine to someone who can check and adjust the crank if possible. Some cranks have too much runout and are just not worth messing with.

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#2008

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qwikboat replied the topic: Re: ZERO DRAG SEALS

Thanks I have check the crank runout it is 1/2 to 0......
#2009

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