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I really can't tell by the video but I can offer an opinion. I had a similar thing happen to me on a 1974 crusader a few years ago that sounded kinda like a lifter clicking and it was coming from the front of the engine. Mine ran great no problem other than the clicking noise, I asked my best friend who has been a mechanic all his life to check it out and he was as puzzled as I was. We traced it down to the timing cover area and after we couldn't stand it any longer we finally took the front end off and there was a worn spot on the inside of the timing cover. My engine is counter rotating with gear drive camshaft and the trush plate holding the camshaft in was worn letting the camshaft gear rub the timing cover because of a worn cam lobe. I replaced the camshaft and wear plate and it is still running today. Come to find out some other crusader owners told me that they have heard that they were bad about the lobes wearing because of the fuel pump rods and low oil supply at low idle for what thats worth. I always crank mine up and then rev it up to about 800 to 1,000 rpm's at idle now. B.B.....
On the subject of zinc additives,does anyone know if straight 30w castrol has zinc in it ?
Not knowing the RPM the engine is turning in the video but that is either definitely rocker arm tapping noises or timing chain slap. Rocker arm noise is usually due to an adjustment nut coming loose, valve spring issue, or a lifter pumping down. The question is what does the other engine sound like? If these are same vintage engines as your boat then they are flat tappet hydraulic lifters. If the engine idles smooth and there are no performance issues you can cross off the valve spring as a problem. So, take a long screwdriver and put on the valve covers and put your ear on the handle end; listen across the valve covers, the timing chain cover and the intake manifold with the engine running. You will be able to determine exactly where that noise is coming from. Be very careful around those whirling and spinning things on the engine.....Any ideas to what this ticking sound could be?
Oil is full and clean. The other engine does not make this sound. It runs like a champ, no problems just wondering what the sound is.
Not knowing the RPM the engine is turning in the video but that is either definitely rocker arm tapping noises or timing chain slap. Rocker arm noise is usually due to an adjustment nut coming loose, valve spring issue, or a lifter pumping down. The question is what does the other engine sound like? If these are same vintage engines as your boat then they are flat tappet hydraulic lifters. If the engine idles smooth and there are no performance issues you can cross off the valve spring as a problem. So, take a long screwdriver and put on the valve covers and put your ear on the handle end; listen across the valve covers, the timing chain cover and the intake manifold with the engine running. You will be able to determine exactly where that noise is coming from. Be very careful around those whirling and spinning things on the engine.....