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rattle from under rocker cover 

 

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 Post subject: rattle from under rocker cover
Posted: Wed Aug 23, 2006 1:09 pm 
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hey guys just noticed i have a rattle under the front end of the rocker cover on my el 6, sounds like i could have a timing chain problem maybe? it doesnt sound good at all!

 

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Posted: Wed Aug 23, 2006 1:32 pm 
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could it be due to clearances opening up from a stretched chain? or something else? car has done 100,000km...

 

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Posted: Wed Aug 23, 2006 1:39 pm 
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there should be a timing chain tensioner just around the front side of the engine somewhere. i have one on my eb. by memory you need an allen key to adjust it. could be as simple as adjusting the tension if its not too stretched. it could be a lifter noise as well which sounds rattly at times

 

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Posted: Wed Aug 23, 2006 1:44 pm 
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The timing chain tensioner is self adjusting

could be a broken guide

 

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Posted: Wed Aug 23, 2006 1:45 pm 
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ive had noisey lifters before and it is definatley a rattley sound and not that ticking/knocking sound a lifter makes. its only slight at idle but gets worse as the revs increase

 

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Posted: Wed Aug 23, 2006 1:47 pm 
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is it possible that the chain has stretched outside of the tensioners ability to take up the slack, if thats what the problem is... what else would make noises from in there?

 

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Posted: Wed Aug 23, 2006 1:49 pm 
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Chain stretch isnt a problem in the falcons, but the guides often snap. Best bet it to take the rocker cover off and have a look down there. You will be able to feel if the chain is slack or if guides are broken.


edit: When you look down the timing cover you might see something that looks like this. A bit of a guide snapped off and sitting somewhere dangerous.

Image

you can see where is snapped from here

Image

The other thing I can think it might be is rooted bearings on your idler pulleys. That could sound like what your describing.

 

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Posted: Wed Aug 23, 2006 2:03 pm 
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it is pretty rare as far as i know for falcon timing chains to stretch so i agree it may be the guides.

 

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Posted: Wed Aug 23, 2006 2:06 pm 
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i havent really taken notice to the location of the guides before, are they obvious? where abouts do i have to look for them? and are they expensive/hard to replace?

 

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Posted: Wed Aug 23, 2006 5:32 pm 
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ive had the same problem since my motor was rebuilt. always thought it was my tensioner but replaced that and its still there. i bought the block of waggin and he said that the timing chain tensioner needs to be shimmed and i told mark from ITS Performance so im guessing he would have done it but then again i got a manual and diff conversion done by him and they both had prbolems galore with them.
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Posted: Wed Aug 23, 2006 5:42 pm 
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stockstandard wrote:
The other thing I can think it might be is rooted bearings on your idler pulleys. That could sound like what your describing.


I think thats the problem I'm having... how expensive is that to fix?
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Posted: Wed Aug 23, 2006 5:56 pm 
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AdamN wrote:
stockstandard wrote:
The other thing I can think it might be is rooted bearings on your idler pulleys. That could sound like what your describing.


I think thats the problem I'm having... how expensive is that to fix?
now that u have said that it could be the idler pully! cos on start up i get this squeal from the pully bearing, i didnt think that it would be related. ill get that fixed ASAP! thanks guys, keep u posted

 

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Posted: Wed Aug 23, 2006 6:05 pm 
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definetly let us know what it turns out to be.. and how much to fix :)
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Posted: Wed Aug 23, 2006 11:35 pm 
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genuine idle pulleys are around $50 for the pair. fairly easy to replace. not much harder than replacing the belt.
I believe there is aftermarket ones that are metal and some believe they are a better product? i cant comment on that as i have not experienced them

 

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Posted: Thu Aug 24, 2006 1:48 am 
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check this first;

Start your car and spray abit of water or belt grip on the serpentine belt and see if the noise goes away.

Sometimes a worn belt can make all wierd noises on plastic pulleys(power steer, idler etc.) Metallic type knocking noises are common with a worn belt on a large plastic pulley.

 

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