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After all this time to think it over, I'm still going with what I posted in #24. Worn cam bearings POSSIBLY caused by delayed oil pressure on cold start-ups. I hadn't had a chance to pull the oil pan and check the rod and main bearings before the onset of cold weather, but its on my list. I...

Words just didn't describe the amount of movement I was seeing ... I knew if I could show folks they could see it right off. Because there are so many different ways a cam shaft can move, its difficult to come up with how to explain. What is clear to one guy just might confuse the crap out of...

From today forward, I am shifting my focus slightly. I am going to be looking to see if ALL of the cam bearings can be replaced without removing the engine from the chassis, or the trans/clutch/flywheel from the rear of the engine. With the cam out, I can see all the way through to the core...

And if the gear were 6 feet across it would appear to be even more. The word "rock" just wasn't giving the best picture. A measurement (.009") is sometimes a static and lifeless thing.

Also see post #24 of this thread. I have gotten the feeling that some readers have either misunderstood what I meant by "rock the cam gear" or do not fully appreaciate the impact that .009” clearance between the cam journal and the cam bearing had. Since I made that post I have tried to...

I cut both of the oil filters open, spread out the paper elements and ran a large magnet over the paper. I found NO ferrous material at all in the filter elements. For the record, I found NO material of any type in the filters. This comes as a bit of a surprise. When I first examined this...

For those following along at home, could you please cite your source more fully including the name of the manual and where it can be found or downloaded. Somebody down the road might find it useful. Thanks.

Attached is a copy of the oil analysis I had performed. I have to admit that I am a bit disappointed in the report. I had expected that the lab would have SOME data on these engines to give a baseline or average of what to expect. I guess these engines are not as numerous as 350 cid Chevies...

Attached are pictures of the cam followers. I see that 3 of them have some light pitting or flaking and one shows signs that it has stopped rotating and the nose of the cam shaft is beginning to wear into its surface. The pitting could be attributed to anything including lack of assembly lube...

I've pulled the camshaft and lifters. For the indicated time on this engine, I and very surprised to find so little wear on the cam and followers. Indeed, the cylinder bores and pistons show very little wear especially when compared to the amount of wear I found on the front camshaft bearing.

Very Good! I hadn't added that into the equation. I sure can't see where the low oil pressure would be helping anything.

I don't know ... and, unless we "hobbyists" find an order somewhere in a TM or can do our own side by side comparison of the two shafts, ... I doubt we will ever find out. I sincerely doubt that contacting White, Hercules or Continental or anybody else for that matter will get us any...

No. If there is a plug back there, it's behind the flywheel. You'd have to pull the trans, clutch and flywheel and whatever else is back there to get it out that way. Sometime this weekend I should have the engine off my truck and in a position where it would be a bit safer to pull the side...

The better question is ... Is it possible to do an "in-frame" cam BEARING replacement .... perhaps as a PM BEFORE the cam breaks. That would depend on how easy the last bearing comes out ... and that is another thing I'm looking at.

I'm seeing it the other way around. Although the area behind the first bearing was perfect for this type of damage, I don't think the cam would have broken if the bearing weren't so baddly worn. The TM indicates the bearing was way beyond the wear limit. Sometime this weekend I should be able...

This is consistent with the information found in the TM. The bearings are all different size bigger in the front, smaller in the rear. I have seen this before on other inline engines of what might be called "older" design and assumed, although never asked that it might have something to do...

I've been wondering this myself and have been trying to come up with a way to measure it. My thinking is that I should mark the bearing in a way to indicate UP and FRONT, then carefully remove the bearing ... and then measure it's thickness's with a micrometer anywhere I want to. I'm also...

The cylinder heads are off. There isn't as much carnage as you would think, only a couple shallow "smiles" in the top of a couple pistons, only a couple shiny spots on the edges of a couple valves. It looks like the pushrods took most of the hit. Apart from that ... nothing abnormal about the...

This is something I've been thinking about. If a cam is going to fail ... that spot is exactly where it would. There is 1/2" of shaft between the bearing journal and the first lobe on the cam ... I think enough room, if you cut into the journal a little, to machine in a rounded corner without...