Engine rattle

[Ayrton]

[steve the grease]

Having said everything I did earlier about the cam follower , it could also be the little end , I was thinking about it in the bath.....it definitely sounds 'top endy' usually quite a heavy vibration with a big end .

[Ayrton]

I've taken the cover off and decided to take the camshaft holder out for a better look as it's too tight in there.
The faces dont exactly look flat but they have this discolored/ worn section, is that normal?
https://i.imgur.com/Mzml2hM.jpg

heres some other images of it:
https://imgur.com/a/IZyZg3K

Also took the opportunity to take the camshaft out for a closer look. I cant hear any noise in the bearings unless I hold it right up against my ear then I can hear a faint metal rubbing, but I suppose that's normal? Also the smaller bearing doesnt seem to spin much (but it's smooth) is that normal?

Ran out of time to check the strainer, so I'll try and do that tommorow.

[MCN]

Children, b4 we dive in and invest in a big bit we should do the preliminary checks.
If there's mechanical failure due to oil starvation the evidence is normally found in the oil filter or screen.
It's a simple check before one discombooberates the engine.
If there's metal in the screen than the engine is dusted.
And start from there.
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Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN.

[Ayrton]

[Polarbear]

I'm of the view that as you have gone this far, just rip it apart. It's a simple engine and once it's out of the frame you can strip it down in a few hours. Then check everything properly, see what's wrong and decide your what you are going to do.
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Triumph Trophy Launch Edition

[bikenut]

Those pads are normally convex, they are domed outwards, flat they are worn and concave ( domed inwards ) they are worn out.

As the cam shaft is out, the valves cannot get tangled up with the piston. As long as the cam chain is held in tension and in line, then it cannot derail and bunch up on the cam crank sprocket ( see cmsnl views ) , meaning the engine crank is safe to rotate.

With the piston at half stroke, any relative movement of the crank back and forth with no piston movement?

If yes then big end and or little end "play".

If so how much crank movement?

You could of course just strip the engine down and do it that way.

What are all those little black specs seen in the picture, see cmsnl exploded views for cam chain slippers etc..

You know if this engine has a centrifugal oil filter and where the oil pick up filtyer screen is, use cmsnl to help you.
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nuts about bikes

[Polarbear]

[Ayrton]

Which black specs are you talking about bikenut?

anyway I just took the oil strainer out and it bad news, I found all this metal in there. There are quiet big pieces and theres a lot of them (that's a electrical tape tub for reference)
https://i.imgur.com/aBiOBWh.jpg

Doesnt seem to be any play in the crank movement that I can see either.
Here's the best shot I can get of the piston
https://i.imgur.com/n8wrFOH.jpg

Is there any point removing the engine and stripping it down or is it new engine time? Unfortunately finding an engine for these that isn't tons of money on ebay seems difficult.

[Riejufixing]

Hm, bits of light alloy? On an old bike I might think "bearing cage", on this.... Alloy component failure or failure of some harder thing gouging out alloy from something?

[Ayrton]

Yep none of it's magnetic.

[Easy-X]

Something has some play in it and a cog is now flapping about and grinding chucks from the inside of the crankcase?

If you're about to junk the engine you may as well dismantle it, that's the easy bit. Putting it back together is the hard work
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Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter

[Riejufixing]

[Ayrton]

[Riejufixing]

Can you restate the precise model and year, please?

[Ayrton]

[Ayrton]

[Riejufixing]

How absolutely fascinating. I suppose they are really metal, and not very hard glue from an old filter?

Perhaps someone will have a brainwave. I'm not sure I will!

[Ayrton]

[Sister Sledge]

I'm not sure what the bearings are inside the crank parts but to me it looks like white metal from a failed plain bearing.
Whatever the metal is, it's gone through a few gears in the gearbox. That'll explain the shape.
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CCM 404 DS

[Easy-X]

[Pete.]

Those bits of metal are just casting flashing IMO. Shouldn't be there but not a mechanical issue. It's certainly not white metal big end bearings because they use roller bearings in the conrod.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[-]

I reckon that’s part of the roller cage of the small end bearing.
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TZR250 2MA road, TZR250 1KT road, TZR250 2MA race, TDR250, YZF-750R Boost colours.
Jaguar S Type 3.0 V6 Sport R, VW Transporter T5 GP LWB Shuttle 140ps DSG.

[Pete.]

[Ayrton]