Speedometer Cable Pumping Oil into Dash?!?!
Thread Starter
|
Posting Guru
Joined: Dec 2004
Posts: 1,023
Likes: 0
Speedometer Cable Pumping Oil into Dash?!?!
My 81 has the SROD, and the speedometer cable is apparently "pumping" oil from the transmission up into the dash and cluster. This unit was rebuilt and then sat for several years, so the guy at the transmission shop reccomended using a synthetic blended oil in the trans to get her up and going smoothly. I'm using a valvoline 80/90 synthetic blend, is this just too light for this? I also recently made a minor repair to the shift rail, causing me to have to remove the top cover of the transmission (with it still in the truck). The fluid was a little low, so I topped it off with the cover off, so I could see the exact level. I filled it just to the top of the fill port, nothing too crazy; is this too full? I also replaced the speedometer cable awhile back, and I put the new rubber "O" ring on it. Any ideas?
Moderator
Joined: Jan 2001
Posts: 56,949
Likes: 2,718
From: Virginia
The transmission should have a vent. It's in different places for different trannies, but even the automatics have a vent in the top of the tranny to relieve pressure as the oil warms up. Your rearend, transfer case, and frontend on a 4x4 all have vents, some with rubber lines hooked to them and some are just a small pipe with a metal cap on it.
Post Fiend
Joined: Dec 2007
Posts: 8,521
Likes: 16
From: Lost
I believe franklin is on the right track here. If the vent is plugged, heat buildup would lead to a pressure increase inside the trans, and that leads to oil leaking *somewhere*. Usually, thru the path of least resistance.
Also, I believe the vent for the SROD trans is located on (or near) that top cover you talked about having removed.
Also, I believe the vent for the SROD trans is located on (or near) that top cover you talked about having removed.
Thread Starter
|
Posting Guru
Joined: Dec 2004
Posts: 1,023
Likes: 0
It looks like the vent is located directly in that top cover. It is simply a raised circle on the cover with a small hole in it, and the gasket underneath has a coresponding hole. As far as I can tell, there is no provision for hooking up a rubber line like the rear end and other components use. I can't imagine why it wouldn't be able to breath. I don't think its even possible to install the gasket incorrectly, but I guess i'll go ahead and double-check it.
Thread
Thread Starter
Forum
Replies
Last Post
Rentaro
1987 - 1996 F150 & Larger F-Series Trucks
9
Feb 18, 2016 03:15 AM
hairyboxnoogle
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
5
Jun 2, 2013 09:14 PM
Thudpucker
1997 - 2003 F150
8
May 16, 2007 09:45 PM
