Renault Scenic Broken cam belt
Rob
Whats the most likely damage when the cam belt breaks. Is it
economically repairable?
And a cost for repairing such?
Or is this a sell for scrap job?
Thanks
Chris Whelan
It's listed as an interference engine, so damage is pretty much
inevitable.
Bent valves will be the most likely problem; piston and cylinder head
damage is also possible. The true situation can only be found by
dismantling unfortunately.
Repair costs can't be estimated accurately until damage is established,
and depend to some extent on what part of the country you are in.
Autodata lists 4.7 hours for a cam belt change on that engine, so having
a top end rebuild is not going to be cheap.
As to economic viability, a lot depends on the condition/mileage/service
history of the vehicle.
Good luck!
Chris
--
Remove prejudice to reply.
Rob
> On Tue, 12 Jan 2010 21:28:53 +1100, Rob wrote:
>
>> Renault Scenic 2003 2.0 VVT engine
>>
>> Whats the most likely damage when the cam belt breaks. Is it
>> economically repairable?
>>
>> And a cost for repairing such?
>>
>> Or is this a sell for scrap job?
>>
>> Thanks
>
> It's listed as an interference engine, so damage is pretty much
> inevitable.
>
Thats what I have been thinking.
> Bent valves will be the most likely problem; piston and cylinder head
> damage is also possible. The true situation can only be found by
> dismantling unfortunately.
>
just how many ??? hope some are OK
> Repair costs can't be estimated accurately until damage is established,
> and depend to some extent on what part of the country you are in.
> Autodata lists 4.7 hours for a cam belt change on that engine, so having
> a top end rebuild is not going to be cheap.
>
Yep
> As to economic viability, a lot depends on the condition/mileage/service
> history of the vehicle.
>
milage 147000km Good clean original car service on a regular basis
except for the timing belt which the local garage was not interested in
or any advice on changing. Just basic oil and filter change.
> Good luck!
>
> Chris
>
Looking to the excitment of lifting the head :)
Thanks
Duncan Wood
> Chris Whelan wrote:
>> On Tue, 12 Jan 2010 21:28:53 +1100, Rob wrote:
>>
>>> Renault Scenic 2003 2.0 VVT engine
>>>
>>> Whats the most likely damage when the cam belt breaks. Is it
>>> economically repairable?
>>>
>>> And a cost for repairing such?
>>>
>>> Or is this a sell for scrap job?
>>>
>>> Thanks
>> It's listed as an interference engine, so damage is pretty much
>> inevitable.
>>
>
> Thats what I have been thinking.
>
>> Bent valves will be the most likely problem; piston and cylinder head
>> damage is also possible. The true situation can only be found by
>> dismantling unfortunately.
>
> just how many ??? hope some are OK
>
It depends if it jumped or snapped. Valve guides can be a bit fragile, but
until you've got the head off you won't know, you might even have got
lucky, but I'd doubt it. Sticking a new belt on & turning it over by hand
won't make it any worse & you can see if the valves are doing anything
very odd.
>> Repair costs can't be estimated accurately until damage is established,
>> and depend to some extent on what part of the country you are in.
>> Autodata lists 4.7 hours for a cam belt change on that engine, so
>> having a top end rebuild is not going to be cheap.
>>
> Yep
>
>
>> As to economic viability, a lot depends on the
>> condition/mileage/service history of the vehicle.
>>
>
>
> milage 147000km Good clean original car service on a regular basis
> except for the timing belt which the local garage was not interested in
> or any advice on changing. Just basic oil and filter change.
>
>> Good luck!
>> Chris
>>
>
> Looking to the excitment of lifting the head :)
>
> Thanks
--
Duncan Wood
Chris Whelan
[...]
> Sticking a new belt on & turning it over by
> hand won't make it any worse & you can see if the valves are doing
> anything very odd.
On the basis that a belt change is listed as a 4.7 hour job, is it still
worth doing that though?
Adrian
much like they were saying:
>> Sticking a new belt on & turning it over by hand won't make it any
>> worse & you can see if the valves are doing anything very odd.
> On the basis that a belt change is listed as a 4.7 hour job, is it still
> worth doing that though?
Given that most of that time is going to be getting to the belt and then
putting all the rubbish back on, very likely.
If you're going to pull the head, you need to get in that far anyway, so
it's just a question of putting a belt on once you've got the remains of
the old one out the way, then seeing if it turns and there's compression.
If so, great. Covers on, cross fingers. If not, then you've wasted a
relatively small amount of time.
Mrcheerful
but wouldn't it be best to dump it in a layby and come back to find that
someone has set fire to it?
Adrian
they were saying:
> but wouldn't it be best to dump it in a layby and come back to find that
> someone has set fire to it?
Why take the risk? DIY!
Rob
> On Wed, 13 Jan 2010 04:32:00 -0000, Rob <mesa...@gmail.com> wrote:
>
>> Chris Whelan wrote:
>
>
> It depends if it jumped or snapped. Valve guides can be a bit fragile,
> but until you've got the head off you won't know, you might even have
> got lucky, but I'd doubt it. Sticking a new belt on & turning it over by
> hand won't make it any worse & you can see if the valves are doing
> anything very odd.
>
>
It broke on the motorway - 20,000km overdue for replacement
Ill pull the head and count the cost, not worth just replacing the belt
then repeating just to turn around having to remove the head.
At 4.7 hrs for the belt looks like an 8 hr total job. Plus get the head
serviced and setup.
Ill see how many pistons have been clipped.
If it becomes too expensive leave the part cost and reassembly for
someone else.
r