timing on a 2005 1.6 147 - Alfa Romeo Forum
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timing on a 2005 1.6 147

hi, new to the site and got a bit of a technical query if anyone could be kind enoguh to help?

my boss has a 2005 147 with a 1.6 petrol engine, recently its had a new waterpump and had a cambelt change at the same time. shes barely driven it since but has done a couple of 20 mile or so motorway journeys.
it went in for some bodywork today and the garage have rang up saying the engines packed in, their mechanic has told me theres been valve to piston contact, at least 1 valve has snapped and smashed the piston and plugs etc, but the belt its self is in perfect condition and is still under tension, so thats not snapped or stripped its self.

is there anything special that needs to be done when changing the belts that could have caused a fault in whatever vvc system is used on this engine, or is it just coincidence that somethings gone wrong so soon after the balt was done?

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If you don't use the correct tools to set the timing, you can get piston/valve contact. Either that, or a previous owner has had a belt snap in the past which has weakened a valve that wasn't replaced.

Look for tipp-ex marks on the cam pulleys as a give-away.
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PS This is what the engine will probably now look like inside

https://www.alfaowner.com/Forum/alfa-...ml#post3681034
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As Iain said, it is essential to use the correct cam lock tools when changing the cambelt on these engines.

If they didn't and the timing was slightly out but she somehow drove it below the revs where the cam timing changes for those few trips after the works then the damage may only have happened when someone took the engine over the point in the rev range where the timing changes.

So yes it is quite possible for this damage to happen without the belt slipping or snapping.
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Possibly quite hard to keep it under the variator threshold on a motorway. Think my 1.6 does about 3,500 rpm at 70mph... Depends how she drives though!
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Without taking the belt off, they might not see a strip where the teeth have been stripped ... probably now down at the bottom on the crankshaft gear.

Who's to say their "mechanic" hasn't ragged it and done the damage themselves ... surely if it's in their "care", they are liable for the damaged engine?!?
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Quote:
Originally Posted by gazza82 View Post
Who's to say their "mechanic" hasn't ragged it and done the damage themselves
That thought crossed my mind as well...
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