BritishV8 Forum

General Category => MG Sports Cars => Topic started by: donfaber on August 25, 2012, 06:47:32 PM

Title: Transmission fluid at speedometer
Post by: donfaber on August 25, 2012, 06:47:32 PM
I have a 79 B with 3.9L V8, T5 camaro tranny, 23 tooth speedo adapter gear and original MGB speedometer cable and speedometer. I now have tranny fluid at the speedometer, leaking on my pants! Anyone know what seal I need to replace, where I get it? Thanks.
Title: Re: Transmission fluid at speedometer
Post by: flitner on August 27, 2012, 02:34:06 PM
Ant trans shop should have what you need.
Title: Re: Transmission fluid at speedometer
Post by: donfaber on August 27, 2012, 03:04:46 PM
Have contacted one - thanks!
Title: Re: Transmission fluid at speedometer
Post by: DiDueColpi on October 03, 2012, 01:42:54 AM
Hey Don,
Just a couple of things to check before you change the seal(s).
Is the trans vent working and clear? Pressure built up when the oil heats up can push it out everywhere.
Do the spirals on the speedo gear shaft and on the speedo cable rotate in the right direction? If they are turning backwards they make an incredibly effective pump that will overpower any seal ( just ask Suzuki and Volkswagen). I've seen speedos that look like aquariums on more than one occasion.
Cheers
Fred
Title: Re: Transmission fluid at speedometer
Post by: donfaber on October 03, 2012, 09:12:09 AM
Thanks, Fred - changed speedometer driven gear and housing ( with 2 new seals) - all is well now.
 Don