Home » Public Forums » GMCnet » [GMCnet] Checking THM425 Fluid Level
| [GMCnet] Checking THM425 Fluid Level [message #289983] |
Thu, 05 November 2015 09:55  |
fbhtxak
Messages: 191
Registered: April 2006
Karma: 0
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Senior Member |
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For Rob and Jim - thanks for your comments...
Rob,
I have no reason to question the accuracy of the marks on the OEM dipstick.
My frustration during my almost 25 years of ownership has always been the
'smearing" of the fluid on the stick immediately after refilling... That is
due to the residual fluid on the dipstick tube wall. That problem cures
itself but it takes an hour or more to get an accurate reading without the
"smearing".
Some kind of "wiper" to run into the tube to "dry" the wall would then allow
an immediate accurate reading of the fluid level after filling. To other
owners: before I set out to cobble something together to do this, if someone
has already done it, please advise.
Jim,
I did the relocation of the vent long ago using the 90 degree fitting with
discharge routed to a reservoir on the outside of the driver-side frame
rail. 'Have never had a burp but have always been careful fill accurately
'Regards,
Fred
Fred Hudspeth
1978 Royale (TZE 368V101335) - Tyler, TX
1982 Airstream Excella (motorhome) - Cooper Landing, Alaska
Date: Thu, 5 Nov 2015 12:04:40 +1100
From: "Robert Mueller"
To:
Subject: Re: [GMCnet] Checking THM425 Fluid Level
Message-ID:
Content-Type: text/plain; charset="us-ascii"
Fred,
Here's something I've sent in a couple of times.
There is one problem with the procedure below, if your body is too "THICK"
when lying on the ground you're not going to be able to
get under the GMC to access the modulator and you'll have to put it up on 4
jack stands making sure it is level.
Regards,
Rob
Date: Wed, 4 Nov 2015 21:31:20 -0800
From: Jim Kanomata
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Checking THM425 Fluid Level
Message-ID:
Content-Type: text/plain; charset=UTF-8
Fred,
As log as you keep the fluid at a lower side, one does not develop burping
when the transmission gets hot.
I like to replace the vent at the rear with a push in right angle tube and
run a hose out to the outside of the frame and attach an use plastic pop
bottle to catch the burp.
That fitting has been discontinued, but we managed to stock some.
It is on our web site under transmission.
On Wed, Nov 4, 2015 at 1:34 PM, Fred Hudspeth wrote:
> Thanks, Ken and others who commented. Apparently no one has found a
> "silver bullet" for immediately getting a readable level on the OEM
> dipstick when refilling the THM 425.
>
> Fred Hudspeth
>
> '78 Royale (TZE "last four"...1335) - Tyler, TX
> '82 Airstream Excella (motorhome) - Cooper Landing, Alaska
>
> Sent from my iPhone
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| Re: [GMCnet] Checking THM425 Fluid Level [message #289997 is a reply to message #289983] |
Thu, 05 November 2015 16:09  |
 |
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Fred,
The transmission dipstick in Double Trouble is one of Ken Frey's extended units which is under the driver side hood. I pull the hand
brake, start the engine, cycle the trans lever back and forth a few times (with the foot brakes on), go out, pull the dipstick, wipe
it off, stick it back in, count to 3, pull it back out, position the end horizontally, then look at the engraved side to determine
what the level is. I then turn it over to see what if the fluid is at the same level on the "back" side.
I've found the fluid level on both sides of the dipstick to be the same.
Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Fred Hudspeth
Sent: Friday, November 06, 2015 2:56 AM
To: gmclist@list.gmcnet.org
Subject: [GMCnet] Checking THM425 Fluid Level
For Rob and Jim - thanks for your comments...
Rob,
I have no reason to question the accuracy of the marks on the OEM dipstick.
My frustration during my almost 25 years of ownership has always been the
'smearing" of the fluid on the stick immediately after refilling... That is
due to the residual fluid on the dipstick tube wall. That problem cures
itself but it takes an hour or more to get an accurate reading without the
"smearing".
Some kind of "wiper" to run into the tube to "dry" the wall would then allow
an immediate accurate reading of the fluid level after filling. To other
owners: before I set out to cobble something together to do this, if someone
has already done it, please advise.
Jim,
I did the relocation of the vent long ago using the 90 degree fitting with
discharge routed to a reservoir on the outside of the driver-side frame
rail. 'Have never had a burp but have always been careful fill accurately
'Regards,
Fred
Fred Hudspeth
1978 Royale (TZE 368V101335) - Tyler, TX
1982 Airstream Excella (motorhome) - Cooper Landing, Alaska
Date: Thu, 5 Nov 2015 12:04:40 +1100
From: "Robert Mueller"
To:
Subject: Re: [GMCnet] Checking THM425 Fluid Level
Message-ID:
Content-Type: text/plain; charset="us-ascii"
Fred,
Here's something I've sent in a couple of times.
There is one problem with the procedure below, if your body is too "THICK"
when lying on the ground you're not going to be able to
get under the GMC to access the modulator and you'll have to put it up on 4
jack stands making sure it is level.
Regards,
Rob
Date: Wed, 4 Nov 2015 21:31:20 -0800
From: Jim Kanomata
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Checking THM425 Fluid Level
Message-ID:
Content-Type: text/plain; charset=UTF-8
Fred,
As log as you keep the fluid at a lower side, one does not develop burping
when the transmission gets hot.
I like to replace the vent at the rear with a push in right angle tube and
run a hose out to the outside of the frame and attach an use plastic pop
bottle to catch the burp.
That fitting has been discontinued, but we managed to stock some.
It is on our web site under transmission.
On Wed, Nov 4, 2015 at 1:34 PM, Fred Hudspeth wrote:
> Thanks, Ken and others who commented. Apparently no one has found a
> "silver bullet" for immediately getting a readable level on the OEM
> dipstick when refilling the THM 425.
>
> Fred Hudspeth
>
> '78 Royale (TZE "last four"...1335) - Tyler, TX
> '82 Airstream Excella (motorhome) - Cooper Landing, Alaska
>
> Sent from my iPhone
******************************
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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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