Engine/Car : R32 GTSt RB20DET
Type of failure : 2 snapped exhaust valves, piston mashed, head mashed.
Factors influencing the failure : Overtightened idler bearing bolt.
State of tune to engine : approx 150 rwkw
Suspension and tyres : std.
Oil used and service interval : Penrite, at 100 000 kms major service by prevvious owner 3000 kms before i bought car.
General comments : 9000 kms after 100k service done just driving home from work, car went bang. A roadside mechanic (who happened to just be parked 30 metres away) heard it let go from that distance. Engine took a couple of seconds to wind down (travelling at 40kms at the time) by time i had come to a complete stop, piston had snapped 2 exhaust vavles, and repeatedly hit the debris into head. 1 dead head, and piston
No indication that failure was about to happen. Changing down from 4th to third when it let go. Those indentations in the pistons are the valve reliefs (std). The bolt just clean snapped off level with the block. Upon removing the timing covers, there was a rubber type dust inside and the idler bearing had a discolouration (like it was heated up). I dont know exactly what was replace at the 100,000 km service, ut the previous owner said it was the full service. I bought the car at 103,000 kms....at 109,000 kms it let go....6000 kms later
New motor is rb31det