| Changing Final Drive oil [message #364081] |
Mon, 17 May 2021 14:04  |
tgeiger
Messages: 518
Registered: February 2006
Location: kansas city
Karma: -1
|
Senior Member |
|
|
So when I was taking the bolts off on the final drive I noticed that all of them had some RTV on the end of them. Is that a trick on making sure the cover and its bolts are sealed up tight? If so, would that be something I should try on all the transmission pan bolts?
Thanks in advance,
TG
Tom Geiger
76 Eleganza II
KCMO
|
|
|
|
| [GMCnet] Re: Changing Final Drive oil [message #364084 is a reply to message #364081] |
Mon, 17 May 2021 16:13  |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
|
Senior Member |
|
|
Do not use RTV on the gasket as it has a Vent passage and we need that open.
RTV on bolts are OK,but not really necessary unless you feel it will seal
better and prevent backing off.
On Mon, May 17, 2021 at 12:04 PM tom geiger wrote:
> So when I was taking the bolts off on the final drive I noticed that all
> of them had some RTV on the end of them. Is that a trick on making sure the
> cover and its bolts are sealed up tight? If so, would that be something I
> should try on all the transmission pan bolts?
>
> Thanks in advance,
> TG
> --
> Tom Geiger
> 76 Eleganza II
> KCMO
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.gmcrvparts.com
1-800-752-7502
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
|
|
|
|
| Re: Changing Final Drive oil [message #364113 is a reply to message #364081] |
Tue, 18 May 2021 12:23 |
tgeiger
Messages: 518
Registered: February 2006
Location: kansas city
Karma: -1
|
Senior Member |
|
|
Jim, had my mechanic change out the oil last season but never was confident he did it correctly. It certainly has RTV on the gasket and I would not be surprised he plugged the vent hole. I have to get down there again and check. What would happen if it had been plugged?
Thanks,
Tom
Tom Geiger
76 Eleganza II
KCMO
|
|
|
|
| Re: Changing Final Drive oil [message #364114 is a reply to message #364113] |
Tue, 18 May 2021 13:38 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
|
Senior Member |
|
|
As the final drive and oil heats up, it can blow final drive fluid out through thee weakest seal. Usually it is the final drive axle seal.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
|
|
|
|
| Re: Changing Final Drive oil [message #364117 is a reply to message #364081] |
Tue, 18 May 2021 17:01 |
tgeiger
Messages: 518
Registered: February 2006
Location: kansas city
Karma: -1
|
Senior Member |
|
|
Well, when I was down there I didn’t see any signs of seals leaking except of course my transmission pan. So hopefully he didn’t plug that vent hole?
TG
Tom Geiger
76 Eleganza II
KCMO
|
|
|
|
| [GMCnet] Re: Changing Final Drive oil [message #364119 is a reply to message #364117] |
Tue, 18 May 2021 17:11 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
|
Senior Member |
|
|
There is a bleeder hole in the transmission case on the bottom where it
joins the final drive. There is a seal on the pinion shaft, as well as a
seal in the forward end of the transmission. If either of those seals fail,
then fluid will leak from that hole. If it is red, then the transmission
seal is leaking. If it is final drive gear lube, then either that seal is
leaking, or that gasket on the final drive breather hole is blocked by
sealant or has the incorrect gasket installed on the cover.
Jim Hupy
Salem, Oregon
On Tue, May 18, 2021, 3:02 PM tom geiger wrote:
> Well, when I was down there I didn’t see any signs of seals leaking except
> of course my transmission pan. So hopefully he didn’t plug that vent
> hole?
>
> TG
> --
> Tom Geiger
> 76 Eleganza II
> KCMO
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
|
|
|
|
| [GMCnet] Re: Changing Final Drive oil [message #364121 is a reply to message #364114] |
Tue, 18 May 2021 20:22 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
|
Senior Member |
|
|
There is a small hole at the top of the cover, make sure it is open.
Also there should be a small shield over the hole so dirt will not get
impacted in the opening.
On Tue, May 18, 2021 at 11:40 AM Ken Burton wrote:
> As the final drive and oil heats up, it can blow final drive fluid out
> through thee weakest seal. Usually it is the final drive axle seal.
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.gmcrvparts.com
1-800-752-7502
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
|
|
|
|
| Re: Changing Final Drive oil [message #364123 is a reply to message #364081] |
Tue, 18 May 2021 21:02 |
tgeiger
Messages: 518
Registered: February 2006
Location: kansas city
Karma: -1
|
Senior Member |
|
|
Ah, saw that piece of metal there. I’ll take a look at it in the morning if the rain doesn’t happen. Will look at the other items as well.
Thanks,
TG
Tom Geiger
76 Eleganza II
KCMO
|
|
|
|
| [GMCnet] Re: Changing Final Drive oil [message #364124 is a reply to message #364123] |
Wed, 19 May 2021 00:21 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
|
Senior Member |
|
|
Should you have any questions feel free to contact me so I can help you or
anyone else.
On Tue, May 18, 2021 at 7:02 PM tom geiger wrote:
> Ah, saw that piece of metal there. I’ll take a look at it in the morning
> if the rain doesn’t happen. Will look at the other items as well.
>
> Thanks,
> TG
> --
> Tom Geiger
> 76 Eleganza II
> KCMO
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.gmcrvparts.com
1-800-752-7502
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
|
|
|
|
| Re: Changing Final Drive oil [message #364133 is a reply to message #364081] |
Thu, 20 May 2021 08:52 |
tgeiger
Messages: 518
Registered: February 2006
Location: kansas city
Karma: -1
|
Senior Member |
|
|
Jim, I’ve re-read this string again and now understand better what is being said. Uggg if the internal seals have been blown out. All I can say now is there is enough RTV on the final drive cover that it was on the end of the bolts when I removed the bolts and had oozed out on some of the edges so it appears to be a healthy amount of RTV used. What I have not verified is if the vent hole has been plugged. Bob my mechanic is a good mechanic so I’d assume he was cautious of that but I’ll get under there to make sure. I’ll call you Jim and go over this with you once you get some coffee in ya.
Thanks again,
TG
Tom Geiger
76 Eleganza II
KCMO
|
|
|
|
| [GMCnet] Re: Changing Final Drive oil [message #364146 is a reply to message #364133] |
Thu, 20 May 2021 13:32 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
|
Senior Member |
|
|
If the cover was put on with RTV only, (no gasket) then the odds are very
good that the sealant found its way into the case vent.
The OEM gasket is a two piece sandwich with a labyrinth section that
vents the case IF THE INSTALLER OPENED THE VENT BY DRILLING A HOLE IN THE
GASKET IN LINE WITH THE CASE VENT!!
Jim Hupy
Salem, Oregon
On Thu, May 20, 2021, 7:12 AM tom geiger wrote:
> Jim, I’ve re-read this string again and now understand better what is
> being said. Uggg if the internal seals have been blown out. All I can say
> now is there is enough RTV on the final drive cover that it was on the end
> of the bolts when I removed the bolts and had oozed out on some of the
> edges so it appears to be a healthy amount of RTV used. What I have not
> verified is if the vent hole has been plugged. Bob my mechanic is a good
> mechanic so I’d assume he was cautious of that but I’ll get under there to
> make sure. I’ll call you Jim and go over this with you once you get
> some coffee in ya.
>
> Thanks again,
> TG
> --
> Tom Geiger
> 76 Eleganza II
> KCMO
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
