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Discussion Starter · #1 ·
Mine aren't broken or doing anything funny but I'm just a-wonderin'... Do the O-rings and piston/spring combo wear out? When replacing the solenoid, do folks usually only replace the electrical solenoid part itself or the entire unit? Do these units get affected by oil sludge buildup or anything of that nature?
 

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When rebuilding a VANOS unit, the seals get replaced (upgraded Viton seals from Beisan Systems), and you should do the piston anti-rattle kit at the same time. Solenoids rarely if ever go bad.
 

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You wont get stranded if the solenoid fails. You should get a code and it will not run as well as normal. I think it affects the idle, and the cams default to high speed position (but it may be opposite, cant remember). So I dont call that a maintenance item. Just replace it if it dies. But like others said, it doesnt happen often.
 
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