Renault Scenic Broken cam belt

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

Thats what I have been thinking.

just how many ??? hope some are OK

Yep

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.

Looking to the excitment of lifting the head :)

Thanks

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.

On the basis that a belt change is listed as a 4.7 hour job, is it still worth doing that though?

Chris

Chris Whelan gurgled happily, sounding much like they were saying:

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.

but wouldn't it be best to dump it in a layby and come back to find that someone has set fire to it?

"Mrcheerful" gurgled happily, sounding much like they were saying:

Why take the risk? DIY!

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.