I have a 88 Ford Sierra which makes clunking noises.. I'ts European, so I guess you're not familiar with the engine, but I've heard this noise from other Sierras this age. It sounds like there is one clunk per revolution, althoug I can't be sure.
I've adjusted the valves, but the sound is still there. I noticed rather heavy wear on the cam, maybe that's it? I haven't even considered changing the cam though.. seems complicated to get the timing right when assembling. And the old piece of junk isn't worth taking to a repair shop.
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