|
|
Joined: Jan 2003
Posts: 977 Likes: 7
ChatMaster - 750
|
OP
ChatMaster - 750
Joined: Jan 2003
Posts: 977 Likes: 7 |
While reading through some of the literature that I have accumulated over the past few years, I came across this March 1934 issue of a Canadian GM Service News Review. I found the instructions on drilling a vent hole in the transmission cover to prevent a buildup of pressure in the transmission and subsequent leaks at the rear wheel bearings interesting. ![[Linked Image from i1302.photobucket.com]](http://i1302.photobucket.com/albums/ag125/wem50/Photo035_zpstopnjg03.jpg)
Bill Masters
|
|
|
|
|
Joined: Jul 2009
Posts: 1,478
ChatMaster - 1,000
|
|
ChatMaster - 1,000
Joined: Jul 2009
Posts: 1,478 |
Wow! That is really something!
|
|
|
|
|
Joined: Oct 2012
Posts: 119
Shade Tree Mechanic
|
|
Shade Tree Mechanic
Joined: Oct 2012
Posts: 119 |
That is some incredible info. Thanks a lot Bill for thinking of others.
1936 Chevy Std
1954 3600 Truck
2008 Corvette Z06
|
|
|
|
|
Joined: Jan 2003
Posts: 977 Likes: 7
ChatMaster - 750
|
|
OP
ChatMaster - 750
Joined: Jan 2003
Posts: 977 Likes: 7 |
You are welcome, oldchevy.
Bill Masters
|
|
|
|
|
Joined: May 2011
Posts: 825
ChatMaster - 750
|
|
ChatMaster - 750
Joined: May 2011
Posts: 825 |
hi there, to be sure that we are talking about the same part in your article, the transmission cover is meaning the part where the gearstick come through and that is where the relief hole should be drilled?  Ps: my transmission leaks so much at the speedo cable connection, do you think that mine has natural ventilation built in? Peter
never give 100% unless you are giving blood.
|
|
|
|
|
Joined: Nov 2002
Posts: 7,472 Likes: 26
ChatMaster - 7,000
|
|
ChatMaster - 7,000
Joined: Nov 2002
Posts: 7,472 Likes: 26 |
It will only vent if there is no oil there to seal it. As long as it is leaking the oil is sealing the escape route. With the vent hole up into the shift lever housing (cover) there should be little if any oil present so the air/pressure will escape. With a "new" vent hole in the housing it may help to reduce the oil leak but it should probably be sealed at the cable in a more efficient manner.
Steve D
|
|
|
|
|
Joined: Aug 2012
Posts: 1,381
ChatMaster - 1,000
|
|
ChatMaster - 1,000
Joined: Aug 2012
Posts: 1,381 |
Good luck with that! Mine has dripped forever and ever and then some more. I've tried several remedies. No luck. I like the vent hole though.
|
|
|
|
|
Joined: Jan 2003
Posts: 977 Likes: 7
ChatMaster - 750
|
|
OP
ChatMaster - 750
Joined: Jan 2003
Posts: 977 Likes: 7 |
Yes, blueyAU, the transmission cover referenced in the article is the part to which the gear shift lever attaches.
Bill Masters
|
|
|
|
|
Joined: Jan 2003
Posts: 977 Likes: 7
ChatMaster - 750
|
|
OP
ChatMaster - 750
Joined: Jan 2003
Posts: 977 Likes: 7 |
I made a gasket from thin rubber and placed it where the speedometer cable outer housing's bell mouth meets the threaded fitting at the transmission. It seems to work.
Last edited by Bill Masters; 12/30/15 07:11 PM.
Bill Masters
|
|
|
|
|
Joined: Jul 2009
Posts: 1,478
ChatMaster - 1,000
|
|
ChatMaster - 1,000
Joined: Jul 2009
Posts: 1,478 |
Sounds like a good idea to me.
|
|
|
|
|
Joined: Jan 2016
Posts: 414 Likes: 8
Backyard Mechanic
|
|
Backyard Mechanic
Joined: Jan 2016
Posts: 414 Likes: 8 |
How big a hole do you need? Is there any particular place in the cover to drill the hole?
|
|
|
|
|
Joined: Aug 2012
Posts: 1,381
ChatMaster - 1,000
|
|
ChatMaster - 1,000
Joined: Aug 2012
Posts: 1,381 |
|
|
|
|
|
![[Linked Image from i1302.photobucket.com]](http://s1302.photobucket.com/user/wem50/media/Photo035_zpstopnjg03.jpg.html)
![[Linked Image from i1365.photobucket.com]](http://i1365.photobucket.com/albums/r757/wisebri24/35%20mississippi/36a2653073970e45fd8cf75a3ba9c8c0_zps2dakr6y5.jpg)