V6 Crankshaft Sprocket Failure

http://farm4.static.flickr.com/3106/5799836803_d61df7027e.jpg

The above shows said sprocket.
Our immaculate V6 Premium suddenly stopped,
starter would spin engine but not start, code reader showed 'camshaft position sensor'. Car transported home where we tried to start it as sensors sometimes revive on cooling down. No joy and starter jammed with engine now locked solid and all the coolant disappeared.
Strip down reveals the loose flange on the sprocket has chewed up the belt and upset the timing. Diagnosis is a broken liner. Car will now be scrapped.
End of dismal story.
Incidentally belt was changed two months ago, I wonder if the sprocket is the same on 1.8's. Pity about the lovely leather seats!

Thats a real shame after all the service work thats recently been done on it.

is there a connection between the belt change and the damaged drive gear????? me thinks so.

Pic of the same cog on mine below. Whats the tensioner like? Is it still able to hold tension if it were all in place and ok. Do you have a pic of the damage done to the belt?


P8161375 fXzpii4


P8161433 Qv4sWYz

freelance said:

is there a connection between the belt change and the damaged drive gear????? me thinks so.

Click to expand...

Must admit I have had same thoughts. Did the flange get knocked during belt change? Damned expensive episode!

thanks for all your comments so far, to save you going to flickr here is the actual damaged sprocket photo:



TJH_8686 by T J HUDSON, on Flickr



Will get a photo of the damaged belt tomorrow.

JonFre said:

thanks for all your comments so far, to save you going to flickr here is the actual damaged sprocket photo:

Click to expand...

Flickr would have been better.

here is a photo of the damaged belt:

Is the straw stuff in the pic the string in the belt? If so is that more of a belt failure first, then the cog damage, rather than the cog being the starting fault?

pulley ,cogs a relaceable wooden tooth in larger gear wheel

Hippo said:

Is the straw stuff in the pic the string in the belt? If so is that more of a belt failure first, then the cog damage, rather than the cog being the starting fault?

Click to expand...

The 'straw stuff' has come from the edge of the belt and in filling the root of the belt teeth has raised the belt up on the crank cog so causing slippage. (IMHO)

HI.
I have a little question, the timing belt have damage on both sides? My freelander have damage on the external side from the timing belt but the real problem was the hidraulic tensor failure. I made an extensive review and found damage too in the both exhaust camshaft sprocket. I try to put a picture from the exhaust camshaft damage.

Sorry to drag up an old tread but to me it looks like the belt has been overloaded. The tensioner piston assembly is good and reliable but the pivoting roller is often badly adjusted so it drags on it's own carrier (causing heat from the friction and drag) or the set screw is'nt tight enough so allows the roller to move in service so causing friction and heat!! I'v done many KV6 belt and have seen badly adjusted tensioner rollers many times even new ones straight out the box!!