300-6 Noisy under load
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300-6 Noisy under load
This problem surfaces when I have the engine under load. I hear what sounds like leaky exhaust or headers not a pinging issue. I can hear each piston. I checked around the exhaust and intake but cannot confirm any leaks. Mileage is down but the engine still has speed on flats but it is hard to make hills. It starts right away. I have checked compression and all are up to spec and very close to eachother. I checked vacuum and timing, new plugs and all the rest of the tune-up parts as well. A friend said that it could be the timing chain has slipped and the valves may be opening too soon/late.
Any ideas. 1981, carb, 4-speed no electronics other than the duraspark module.
Thanks
Coastal Trucker
Any ideas. 1981, carb, 4-speed no electronics other than the duraspark module.
Thanks
Coastal Trucker
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Checked timing by setting up TDC on #1 piston manually then checked timing to see if balancer was off. It was ok so I checked timeing with new light and adjusted no more that 2 deg. No change. I read in this forum that there is a discrepancy in the choice of timing marks on the 300 engine. I marked mine when I verified the TDC and used the passenger side marks which I understand are the correct marks. At least that is where it indicated when I checked TDC. I keep going back to mechanical slippage such as the timing chain as this wasn't an overnight change but appeared slowly.
Johwil
Johwil
