Triumph TR3 drawing

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Triumph TR3 FAQ page

Checking cam timing  without disassembling the engine (TR2-4A)

OK, a simple way to check with engine together & in the car, if it's a symmetrical lobe cam...

Set #4 (6) inlet & exhaust valve clearance to a big number, .050-.060 is enough for most profiles. It doesn't matter what the number is, it just has to be accurate, make sure it's right on the base circle when you set it. Then turn the engine by hand until the #1 cylinder is at TDC on the combustion stroke. At that point the #4 (6) exhaust is on the closing ramp & the inlet is opening & if the cam is set straight up, no advance/retard, the clearance on #4 (6) valves will be equal. If not, just turn crank slightly until clearance is equal & note variation from TDC.

Glen

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