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Message started by augh on 07/12/05 at 01:14:18

Title: Valves cover screaming
Post by augh on 07/12/05 at 01:14:18

The other day while driving 125 miles thru my beautiful Tuscany I heard a strange sound coming out from the valve cover (this at least was my impression). It's like a bell screaming and is coming out, when the bike is decelerating, at low rpm's. I like to keep valve clearence over the required free play adjustment ( I have the feeling that the bike has more power at low rpm's and gets rpm's quicker) and the valves are always noisy, but I never heard it before. Is it now the time to adjust the free play or could it be something else (cam chain??)?? My bike has 6,000 miles on. Tx, Augusto.

Title: Re: Valves cover screaming
Post by Greg_650 on 07/12/05 at 05:51:15

augh wrote:

Don't understand the description of a "bell screaming".

Title: Re: Valves cover screaming
Post by augh on 07/12/05 at 06:20:40

Let me try to describe it:

It's a metallic sound coming out from the valve cover around 1500-2000 rpm's only when the bike is decelerating . It reminds me a lament . It' s not there when accelerating. The frequency is very close to a small /medium bell . I wish I could record it . I had the impression that was created by the too much free play of the valves and it appeared all at once . Tx Greg for your attempt to help me find the reason of it. Augusto.

Title: Re: Valves cover screaming
Post by Paladin on 07/12/05 at 06:30:38

Sounds like something is loose that that develops a resonate vibration at a particular engine speed. It'll only get worse until it falls off, unless you find and tighten the loose screw/bolt.

Our New Beetle did the same thing, but it sounded more like someone had added a 'fart pipe' to the exhaust. Noticed only on decel as on accel it was covered by the louder exhaust and shorted duration of passing thru the offending RPM range.

Title: Re: Valves cover screaming
Post by Greg_650 on 07/13/05 at 05:39:51

augh wrote:

Well, I don't know...but I think that I'd make sure not to run the engine until I had a peek inside to see what could cause that sound. Doesn't sound good.

Title: Re: Valves cover screaming
Post by augh on 07/14/05 at 00:50:29

OK , I worked on the bike adjusting the valves freeplay.
While disassembling the left chromed part on top of the engine, I noticed that the front bolt , the long one, was not tight. I drove the bike only for few miles and could not hear anything strange. Hope the problem is solved now. I believe the bolt head created the problem. Tx you all. Augusto.

Title: Re: Valves cover screaming
Post by Savage_Rob on 07/14/05 at 05:04:22

Yeah, those chrome covers do kinda function as bells when not tight (or if missing any rubber pads).

Title: Re: Valves cover screaming
Post by DavidV on 07/14/05 at 06:09:13

Is there any reason not to just leave the chrome covers off? I've always thought they looked odd. And I bet it'd make swapping the sparkplug simpler.

Title: Re: Valves cover screaming
Post by Greg_650 on 07/15/05 at 06:27:33

How often do you need to swap the spark plug?

Title: Re: Valves cover screaming
Post by DavidV on 07/15/05 at 21:01:29

Might check it quite a bit while working out the jet.

So, are the covers purely cosmetic?

Title: Re: Valves cover screaming
Post by WD on 07/15/05 at 21:21:54

Yep. Except for keeping small leaves out of the plug cavity.
-WD

Title: Re: Valves cover screaming
Post by DavidV on 07/16/05 at 06:22:22

Cool; thanks.