I finished adjusting the valve clearances on my TR4A, started it up and heard a
tapping sound. Rechecked the clearances. Still had tapping sound. Pulled the
rocker cover and ran the car without the cover to isolate the culprit (not a
pleasant task!). #2 exhaust. Readjusted again. Still tapped.
Playing around with the rocker I could get it to make a metallic tapping sound,
so I pulled the rocker shaft assy and found the pushrod had a loose ballcup.
Not sure if this was an issue or not, but I filled the pushrod up with oil, put
everything back, adjusted one more time and the tappings gone!
But, #4 now was tapping. After several attempts of adjusting to different
clearances it seemed that .007" seemed best for noise, not the .010" like the
manual claims. The cam is stock.
Couple of questions came to mind as I went through this. 1.) Was I really
adjusting the valves correctly? Or, can someone tell me how they do it? 2).
The pushrods have a hole in the ballcup but nothing at the other end (tappet).
Should they be filled with oil? If yes, how can you get it in there when the
hole is so small? Most of the pushrods ballcups would not come off, thus my
last question 3) Should they come off and is this an issue?
Thanks!
John in San Diego
'67 TR4A IRS
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