| [GMCnet] Transmission External Filter [message #72560] |
Mon, 01 February 2010 23:19  |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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G’day,
The messages discussing the mileage between trans fluid changes got me to
thinking (smell the wood burning?) I reckon that having an external filter
on the trans might not be a bad idea. To see where the best place to install
it I wanted to check the oil flow paths. I checked Maintenance Manual X-7525
– Nothing. I checked MM X-7625 – Nothing. I checked MM X-7725 – Nothing! I
have a copy of the 1967 Oldsmobile manual and found it in there.
From what I can tell the fluid enters the filter in the sump, goes to the
pump and from the pump to the pressure regulating valve. There are two
outlets on the pressure regulating valve, on goes to the torque converter
the second to several other components in the transmission.
The two lines that go to/from the cooler are labeled “LUBE” and “CONVERTER
RETURN.” One would assume that “CONVERTER RETURN” is the line from the
cooler so “LUBE” is to the cooler.
I think that if you were to add an external filter that it would be best to
put it in the “LUBE” line to the cooler because if you did have a trans
failure it would keep a lot of crap from getting to the cooler.
Comments please.
Regards,
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Transmission External Filter [message #72569 is a reply to message #72560] |
Tue, 02 February 2010 01:34  |
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ljdavick
Messages: 3548
Registered: March 2007
Location: Fremont, CA
Karma: -3
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Senior Member |
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I don't know what yo'u would gain from an extertnal filter on a transmission. The only concern is temperature of the fluid, there is no blow-by, no fuel washing down the cylinders, etc., like with engine oil. Transmission fluid generally can go much, much longer than engine oil and the filter generally just catches those metalic bits that get sucked up from the sump.
I'm talking out my ear, so please correct me if I'm totally wrong. This opinion comes from auto shop class in high school, what, 35 years ago?
Larry Davick
----- Original Message -----
From: "Rob Mueller" <robmueller@iinet.net.au>
To: gmclist@temp.gmcnet.org
Sent: Monday, February 1, 2010 9:19:37 PM GMT -08:00 US/Canada Pacific
Subject: [GMCnet] Transmission External Filter
G’day,
The messages discussing the mileage between trans fluid changes got me to
thinking (smell the wood burning?) I reckon that having an external filter
on the trans might not be a bad idea. To see where the best place to install
it I wanted to check the oil flow paths. I checked Maintenance Manual X-7525
– Nothing. I checked MM X-7625 – Nothing. I checked MM X-7725 – Nothing! I
have a copy of the 1967 Oldsmobile manual and found it in there.
From what I can tell the fluid enters the filter in the sump, goes to the
pump and from the pump to the pressure regulating valve. There are two
outlets on the pressure regulating valve, on goes to the torque converter
the second to several other components in the transmission.
The two lines that go to/from the cooler are labeled “LUBE” and “CONVERTER
RETURN.” One would assume that “CONVERTER RETURN” is the line from the
cooler so “LUBE” is to the cooler.
I think that if you were to add an external filter that it would be best to
put it in the “LUBE” line to the cooler because if you did have a trans
failure it would keep a lot of crap from getting to the cooler.
Comments please.
Regards,
Rob Mueller
Sydney, Australia
AUS '75Â Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
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Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy
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| Re: [GMCnet] Transmission External Filter [message #72584 is a reply to message #72564] |
Tue, 02 February 2010 07:46 |
shawnee
Messages: 422
Registered: February 2004
Location: NC
Karma: 0
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Senior Member |
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| bukzin wrote on Tue, 02 February 2010 01:09 |
So is anyone doing this?
Was it a 'stock item' on any of the models?
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The outside filter was not a standard item on a new coach. I put mine on the cooler discharge just because it was convenient. Installing it on the cooler inlet line would be better since it would catch any junk coming through if you have a transmission failure. If you ever have a transmission failure then you must clean out the cooler diligently! If you don't, the transmission will not last long. When mine failed I was only 10 miles from the Bean Station Dixielander rally and two people took over the job of cleaning the cooler. They ran several cans of brake cleaner through the cooler before it came out clear. It was amazing the amount of junk that was in the cooler and lines. Putting a filter in the cooler discharge after a transmission failure is a great idea to prevent anything getting to the transmission. If you ever have a transmission failure do it close to the Bean Station Rally because you are going to get a lot of expert help. They even had a rebuilt transmission there ready to put in.
Gene Dotson
74 Canyonlands
www.bdub.net/Motorhome_Enhancements New Windows and Aluminum Radiators
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| Re: [GMCnet] Transmission External Filter [message #72590 is a reply to message #72560] |
Tue, 02 February 2010 09:26 |
John Wright
Messages: 118
Registered: September 2008
Karma: 0
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Senior Member |
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Rob,
I have had this filter installed since 2001. You can find these remote
filter bases at most autoparts stores or from Jeg's or Summit. It is on the
line out of the transmission to the cooler. I had forgot that I posted
these pictures a number of years ago.
<http://www.gmcmhphotos.com/photos/showgallery.php?cat=3670
http://tinyurl.com/y9yt37v
This is the one that I bought a long time ago.
http://www.summitracing.com/parts/TRD-1028/
J.R. Wright
On Location at Florida Space Coast
On Tue, Feb 2, 2010 at 12:19 AM, Rob Mueller <robmueller@iinet.net.au>wrote:
> G’day,
>
> The messages discussing the mileage between trans fluid changes got me to
> thinking (smell the wood burning?) I reckon that having an external filter
> on the trans might not be a bad idea. To see where the best place to
> install
> it I wanted to check the oil flow paths. I checked Maintenance Manual
> X-7525
> – Nothing. I checked MM X-7625 – Nothing. I checked MM X-7725 – Nothing! I
> have a copy of the 1967 Oldsmobile manual and found it in there.
>
> From what I can tell the fluid enters the filter in the sump, goes to the
> pump and from the pump to the pressure regulating valve. There are two
> outlets on the pressure regulating valve, on goes to the torque converter
> the second to several other components in the transmission.
>
> The two lines that go to/from the cooler are labeled “LUBE” and “CONVERTER
> RETURN.” One would assume that “CONVERTER RETURN” is the line from the
> cooler so “LUBE” is to the cooler.
>
> I think that if you were to add an external filter that it would be best to
> put it in the “LUBE” line to the cooler because if you did have a trans
> failure it would keep a lot of crap from getting to the cooler.
>
> Comments please.
>
> Regards,
> Rob Mueller
> Sydney, Australia
> AUS '75 Avion-The Blue Streak TZE365V100428
> USA '75 Avion-Double Trouble TZE365V100426
>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
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| Re: [GMCnet] Transmission External Filter [message #72626 is a reply to message #72606] |
Tue, 02 February 2010 16:20 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Ron,
IMHO a filter in the inlet to the cooler should catch metal particles coming
from a trans that had failed but just in case it didn't catch them all I
would still flush the cooler, lines, and filter housing in addition to
replacing the filter.
Regards,
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of RONALD KAZI
Sent: Wednesday, 3 February 2010 3:59 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Transmission External Filter
Just replace the transmission filter if you have a failure. Not an
expensive item and costs less than pulling yet another transmission.
Our Danny Dunn transmission (Is he still around?)and the cooler my
transmssion never gets anywhere near hot.
Ron and Julie
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GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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