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I'm pretty much at a loss as to why there seem to be so many random factors in the failures.
One thing that I was considering is that the beginning of the failures I've seen in the last year coincided with my chosen oil supplier ceasing production of the lubricant I'd used for the entirety of the 8V motor's life. Having said that I remain deeply sceptical about that factor having any relevance or validity.Pete
When they stopped making the 10/70 I started seeing failures. Is it connected? I doubt it but it is a strange coincidence innit?I now use 10 Tenths premium 10, the replacement 10/60.Pete
Well, I was finally able to spend some time in the garage. I finished up the right side , then pulled the left side, after spending a lot of time collapsing the cam tensioner with care.The left had not been showing any measurable signs of wear. But the exhaust follower is toast.......I have a mediocre photo that I added.So what the heck is going on with the exhaust side. I believe Pete also mentioned that the exhaust was more likely to fail. Yet it is a smaller valve.Odd.
Remember although the exhaust valve is smaller and lighter it also has to open the valve against the remanents of comustion pressure BBDC wich could well be 200-300 psi or more.Ciao
My guess would be more heat. Welcome to my world....Pete
The way the camshafts are preloaded to eliminate end float is also different.
Roller cam profiles are different to flat tappet profiles due to how the follower actually rides the cam so you can't use flat tappet cams with roller tappets. Pete
Pete , are you replacing the cams on all or the roller swaps? dave