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1988 911 Carrera Engine Noise Under Load


Vehicle Information: Model: 911 Carrera 3.2; Year: 1988; Body Type: Coupe; Engine (type, size, modifications): 3.2 w/ 964 Cams, extrude-hone, B+B full exhaust ; Total Mileage: 60000 miles;

I've noticed over the past several months that at higher RPM (>3500) thetone of the motor changes significantly, adding a mechanical brrrrrrsound; growley, NOT ticky or high pitched, that varies with rpm but isless apparent on light throttle. Declutch and the motor revs freelywithout the noise. I initially thought the noise was valves in need ofadjustment. Had this professionally done but didn't fix it. I've checkedall the swaybar mountings, motor mounts, exhaust brackets, etc. hoping tofind something rattling or banging. No luck. I've noticed the sound isgetting slowly more apparent and can be induced in all gears. I visitedmy local mechanic and we drove for no more than 1 km before he said turnaround and keep the revs down. His diagnosis--bad rod end bearing. Heasked-"getting slowly worse?" Yes. "Only at higher RPM under medium tofull load?" Yes. "Worse when the motor is hot?" Yes.The car is as strong as ever, pulls to the limiter in 5th on theautobahn, has 4 bar oil pressure when hot at high rpm. Come to think ofit, the oil pressure might be slightly lower than before, but I had putthat down to long distance high speed running. The motor has never everbeen hot-typically no more than 1/3 up the gauge. Could I possibly get asecond opinion?

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