I have just installed the third speedo in my TR3A and am getting the same
results. First, the needle reads low and goes through fits of wide
variations,
the highest of which appear to be the correct speed.
Speedo 1: The original. Someone "fixed" this one and left parts out that
run the odometer and trip meter but the needle magnet mechanism seemed to work
OK but it appeared to run 20 mph slow, and ocassioanlly has fits.
Speedo 2: I took the guts out of a TR6 speedo and put them in my original
speedo and all seemed to work OK except the trip meter numbers did not line up
with the window properly on the original face, but, OK lets try it. It seems
to run about 20 mph slow and occassionally has fits
Speedo 3: Just bought it used. A fine looking piece of equipment for less
than half of sending one to Nisonger. I installed it. It appears to run
about 20 mph slow and occasionally has fits.
I have installed a J type OD on this car with the 90 degreee adapter. I
have a friend who has done the same on his 3A and has no issues with the
speedo.
I have another friend who has MGs and suggests that the problem may go back
to something he experienced with one of his MGs with OD. Now, I realize to
many on this list that this is like saying my dog gets sick when he eats
chocolate bars, so I should not eat chocolate bars.
What the MG friend has suggested is that the drive gear in the OD tail piece
that drives the OD speedo gear is not keyed to the shaft and maybe slipping
on the shaft as it rotates. Tightening the nut on the shaft on the end of
the OD tailpiece will "capture" this gear and may correct the problem.
Before going there I have a list of other things to check out on this, but
what say the list?
David Lylis
69 TR6 CC26160L
60 TR3A TS74461LO
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