blackbird939 wrote:
Well, sigh, another vehicle of mine has developed a loud tapping. My '69 Porsche
911 had something similar and it turned out to be galled cams and cam bearings
starved of oil. That was easy to fix.
I bought a 75 TGBII. It ran poorly when I first received it. It was deiseling
bad--run on for 10 seconds. Carbs were overflowing and mixed with oil for some
time before I realized. Once I did, I drained oil and replaced filter. New oil.
I rebuilt filthy carbs, installed 123, 40KV coil, new plugs, new wires, oil,
timed to 10BTDC and adjusted valve lash today. The oil was very low when I got
vehicle, but it DIDN'T tap. After all of this basic maintenance, the TGBII has
much more power and yet now it has a loud tapping in time with the valvetrain. I
thought it might be that the fact that gas got into the oil for 20 miles or so
before I realized might have washed out the rings or something. piston slap??
After adjusting the valves, the engine is quieter, isolating that tapping! Seems
to be coming from the intake/exhaust side of the motor- around the number 3-4
cyl. There seems to be no loss of power- it is pretty strong IMO. Easily/quickly
gets up to 50mph. This can't be a stuck valve, because I adjusted all of em. A
stuck lifter? Or ?? How hard or easy is it to remove the head? Can I use the 164
B30 head? It's higher compression, right?
I can post a youbube vid of the sound if anybody cares to wanna help..
It really seems to be ONE area - one cylinder making the noise. Stethescope says
exhaust side of 3/4...
Signed,
Bummed with a B30A