SOHC.co.uk Forums > CB500/550

valve collet down the cam-chain tunnel

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madoc:

I was changing the valve stem oil seals on my CB550/4 using the string down the plug hole.
I done 7 but on the last one, the collet managed to flick out and avoid all the rags stuffing plug holes and camchain tunnel and disappear down the front hole where the cam chain runs.

removing the sump failed to find it.. (although there is a large scary piece of metal in there - but it's very clean apart from that) ...
Question is what is the risk here ?  It's a big enough chunk to cause damage.
I turned the engine a fair few times (plugs and rockers are off so it spins well) and it seems ok.....

The cam chain bottom run is above the primary chain, so it's hard to know.
The primary chain sprocket actually moves maybe 5mm side to side, which is a worry as well.

matthewmosse:
Fish down there with a magnet on a stick. I don't like leaving extras down there, a valve head is definately enough to make a hole in the cases but I'm unsure as to whether a collet will do dammage. You can drop the bottom cases without splitting the top end but you'll need to dismantle the cluch area so best to fish with a magnet on a stick first.

Bryanj:
You have to get it out as if it lodges in a chain whilst the engine is running its an engine destroying event mate. It could have lodged in any of several nooks or crannies or even be lying in the bottom crankcase, but no matter what it has to come out!

LesterPiglet:
Let's see a pic of this mystery metal.

701arvn:
I have had some success with a Hoover to retrieve a screw dropped down the spark plug hole.

But only because I couldn't find the magnetic prodder thing.

Andy

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