Hi Greg,
The speedo could g
Hi Greg,
The speedo could go full scale, flicker and act eratically under a low battery condition. This is quite normal...
If the problem turns out to be the gear set which drives the impulse transmitter, the repairs can be done with the gearbox still in the car. There are two gears...One which actually drives the impulse transmitter. This can easily be removed for inspection by simply removing the pinch bolt on the impulse transmitter tubular housing. It is a single 8mm bolt. Simply remove the bolt...and twist the entire housing whilst pulling downward.
On the other hand, the gear on the transmission is a bit tougher to get to...Likely, you'll have to remove the alternator (oh, what joy!)...and then remove the entire speedo drive housing. Once the housing is off, you'll see a helically-cut gear on the end of the transmission shaft. The gear is held on with a snap-ring. The gear will slide off, with little force required. There's a small woodruff key that prevents this gear from free-wheeling on the shaft. No further disassembly is required...
As Ferrari used this geardrive set-up on most of the BB cars...I'd bet that Ferrari-UK has these parts.
Regards,
David
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