gardener345 Posted 24, May 2022 Report Share Posted 24, May 2022 Hi, I have a 2013 Renault Megane RS265 Cup. At 48,800 km approximately one year ago as part of routine maintenance I had the auxiliary drive and timing belts replaced. About 11 months and 2,900 km later I had a complete engine failure with loss of compression. Renault diagnosed this as a broken drive belt which then got under the timing cover, resulting in disruption of the timing belt and consequent bending of the valves. They concluded the cause was a workshop fitment error in replacing the belts, and repaired the engine at their cost (approx. $5000 in parts). Four days and 55 km after I collected the repaired car, I had another complete engine failure with loss of compression. The car was delivered back to the Renault dealer. The assessment was that again the drive belt was damaged and caused the timing belt to be disrupted. This time, however, they concluded the reason was due to crankshaft end float that caused the belt to jump ribs and split. They would not repair the car at their cost. I have a photo of the drive belt taken from the top of the engine after the second breakdown. This shows that the belt was still on the pulley, but on the RHS what appears to be an almost perfect “delineation” of the belt has occurred. It is my understanding the drive belt on a F4RT engine is a 7-rib belt. I can’t accurately determine how many ribs are left but it doesn’t look like 7. I am still trying to get an independent inspection of the damage. I have had very little response from the local Renault dealer. Accordingly, I have discussed the issue with many mechanics, and with the local roadside assistance organisation. All have agreed that end float, unless very extreme, would not cause this problem, and I would have been aware of it if it was that severe. The car had only travelled 51,700 km before the first engine failure and has always been serviced according to specification by Renault dealers. Is there anyone who can help with the diagnosis? Thanks Quote Link to comment Share on other sites More sharing options...
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