Under Construction

September 29th, 2008

Please pardon our dust while we improve the website over the next few days.  If you need anything please feel free to call 616-301-2888 or email Mike.  Thank you!

Q & A: Overdrive & Speedometer

Saturday March 16th, 2002
Q & A, MGA, MGB, MGC, MG T-Type, Midget
John,

First off, thank you for the help on my wifes 79 Midget. The exhaust manifold was cracked, and the two mount nuts, bottom center, were loose, allowing exhaust gas into the intake. The carburetor required new needle. (old one flat on one side). It was converted to manual choke befor I got it. I had to take the choke apart to get the grit out. It can and will go back in wrong, allowing it to run fine at idle, and reving in the drive, but sputter and run like the proverbial dog. Car runs great now thank you.

My overdrive question is on the speedometer. The vehicle is a 1963/64, (not sure which year really) MGB Roadster. Body # GHN3L-23082, Engine # 18G-U-H-23156. The car was retro fitted with an overdrive unit. The gearbox still has the original 90 degree fitting for the cable. The speedometer is #1060. I have sent it in to be recalibrated. The company said according to their formula it shoud be right. It's NOT.......

My question is when overdrive is fitted as an afterthought, what else needs to be changed in order to get the right readings?

Your help as always is greatly appreciated.

Bill

BILL!!

Try this for 100% correct calibration:

Fit the speedo back into the dash and go out for a LONG drive on the expressway. Now you'll have to trust the government on this one!

Drive an exac... read more