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  #1  
Old 08-08-2003, 05:32 PM
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Question what is a rotocap?

Just was wondering, what is the function of that bearing that sits underneath the valve springs, called a rotocap? What is the consequence if it seizes?

Thanks in advance for helping to educate me!
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  #2  
Old 08-08-2003, 05:37 PM
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Location: Ontario, Canada
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I think you're talking about the valve rotators. If so, the purpose is to turn the valve slightly, every time it opens & closes.
This results in a kind of " self-cleaning " action, lessening the chances of a minute piece of carbon holding a valve open.
If it didn't rotate anymore, you may never see a problem.
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  #3  
Old 08-08-2003, 09:08 PM
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Then again, the valves can wear out of round, giving you intermittant sealing and intermittant miss from no compression, backfires up the intake, etc.

Replace them if they are frozen, they are cheap.

Peter
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1987 300D Turbo killed 9/25/07, 275,000 miles
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  #4  
Old 08-09-2003, 03:53 AM
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Thanks for the info, guys!

Just wondering, is the rotocap standard design, or a Mercedes refinement?
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  #5  
Old 08-09-2003, 09:01 PM
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Just about every engine has them except "standard" American automobile engines, for some reason.

Some American engines have a rocker arm design that is also supposed to rotate the valves for the same reason.

Peter
__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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  #6  
Old 08-10-2003, 02:29 AM
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Join Date: May 2002
Location: Hayward, CA
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Besides cleaning, the rotocap keeps the entire diameter of the valve head a uniform temperature; thereby preventing warpage
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