To chase throush these problems you really need the workshop manual, but if you plan to try this yourself, let me know and I’ll dig up the troubleshooting process and solenoid adjustment specs. There was also a recall in 1978 to fix chafing wires from the switch to the solenoid, these shorted on the base of the gearstick causing the overdive to drop offline.įinally, the 4th gear & reversing light switches on the gearbox can create problems, these are designed to prevent overdrive engaging when in reverse or any gear other than 4th, if they are faulty those switches will also cause the overdrive to malfunction - note some earlier boxes allowed overdrive to engage in both 3rd & 4th. I have a friend who has done the conversion to a 38 Packard It is a fairly simple conversion.
For Sale: LAYCOCK NORMANVILLE OVERDRIVE SERVICE MANUAL w/ Electric Controls Repair, Condition: New, Price: 21. 22a-manual transmission (fr) 22b-manual transmission overhaul. You could have a faulty switch, solenoid or the solenoid control rod could be out of adjustment. Ferrari laycock overdrive 250 gte & 330 gt MK1 service manual. The solenoid energizes when you flip the switch and pushes an adjustable control rod to actuate the overdrive. The overdrive control circuit is very simple comprising of a switch and the actuation solenoid mounted on the overdrive unit. The overdrive unit shares the same oil as the gearbox, low gearbox oil can cause the overdrive to intermittently drop offline. The MGB uses a Laycock overdrive unit, this is not integral to the gearbox but is bolted to the rear of the gearbox in place of the tailhousing. The MGB overdive if identical to Jaguar, therefore I know this system reasonably well.
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