High Rpm knock Part 2 Got Pics of cam

[bmcecosse]

The tops of the tappets are showing wear ? If there is any depth to the wear them certainly they should be renewed - otherwise, just ignore surface marking - or have them surface ground - by no more than 5 thou I suggest! - at a machine shop. If some gaps were big - and others tight, maybe swapping the shims around will give near enough the correct clearances - certainly worth a try.

[76Triumphtr7]

The tappets have light grooves in them you can see them and if you run your nail across them you can feel them but otherwise you cant feel them. Also I noticed the cam bearings were grooved pretty deep on top and so were the journals of the cam. (Im wondering how badly this motor was over heated now) So I took the cam I had in the garage and the bearing caps from that head and installed them on the head thats in the car. The engine got quieter the noise now comes in at 3000 rpm, the oil pressure is much higher, anything below 800rpm the oil pressure light would come on now it went below 500rpm and the light still didn't come on. The only semi odd thing is now all the valves are loose, except the #1 exhaust valve which is still a little tight. The cam and bearings was from an 80k tr7 Spyder, did Triumph make 2 cams for that year? One that had a higher lift and longer duration then the other? I'm just trying to rationalize the change in valve clearance I expected it to become tighter not looser.

1976 Tr7 Coupe
1980 Tr7 Convertible

[John Clancy]

Each time the cam is removed the tappets have to be checked and set accordingly. Every camshaft is different. Changing to a different cam certainly necessitates setting the valve clearances.

Another thing I found (over 20 years ago) was that over time the valve springs appear to compress a bit. This caused numerous resets of the tappets for several thousand miles after installing new (uprated) valve springs before they seemed to settle.

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