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| [GMCnet] transmission overheating [message #188232] |
Thu, 25 October 2012 15:17  |
JIM ELMER
Messages: 1
Registered: October 2012
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Junior Member |
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Help! My vehicle- -- -- 1976 palm beach which has original 455 olds
engine and transmission with about 105,000 miles. I have installed
auxillary cooler and large capacity 'Ragusa' pan, but am still getting
extreme temps, even in cool weather. The engine does not overheat. I had a
local tranny shop, with a good reputation (?), check the fluid flow ,
reported ok. Still blows fluid from vent after about 30 to 50 miles of
driving. Hills are horrible. Do I need to have a rebuilt installed? If so,
anyone know any good shops in the Portland,Or., to Longview, Wa area? Any
other ideas? Thanks, Jim.
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| Re: [GMCnet] transmission overheating [message #188235 is a reply to message #188232] |
Thu, 25 October 2012 15:58  |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
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Fluid being expelled from vent on transmission strongly suggests too much fluid in transmission. This is a very dangerous condition because if the fluid hits the hot exhaust system, you could have a very nice fire.
With the Ragusa pan that adds to the total capacity and an additional external transmission cooler added, you seem to have covered all the bases. Only thing left is Tom, Grandview Motors S.S transmission lines.
Do you have an actual trans temp gauge, or some other method of measuring the temperature that are present after running? Temps can spike, after creating a long hill, etc.
Does it shift okay? Any possibility of internal damage? Any bits and pieces in the drained transmission fluid? Wish that I could be of more help.
If you go to a rebuilt, bit the bullet, and have Manny build you one. Get local shop to install it for labor charge, if you do not have enough local fellow members of the GMC cult. It's a calling.
Tom, MS II
2012 Phoenix Cruiser model 2552
KA4CSG
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| Re: [GMCnet] transmission overheating [message #188237 is a reply to message #188232] |
Thu, 25 October 2012 16:42 |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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Senior Member |
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Sir: Welcome : After driving park on level ground and put a pan under the modulater valve and take it out. If fluid comes out it is too full, if not it is to low and another issue. After the fluid quits running freely replace the modulater valve and drive it to see if temps are better. Too full is bad.
| JIM ELMER wrote on Thu, 25 October 2012 16:17 |
Help! My vehicle- -- -- 1976 palm beach which has original 455 olds
engine and transmission with about 105,000 miles. I have installed
auxillary cooler and large capacity 'Ragusa' pan, but am still getting
extreme temps, even in cool weather. The engine does not overheat. I had a
local tranny shop, with a good reputation (?), check the fluid flow ,
reported ok. Still blows fluid from vent after about 30 to 50 miles of
driving. Hills are horrible. Do I need to have a rebuilt installed? If so,
anyone know any good shops in the Portland,Or., to Longview, Wa area? Any
other ideas? Thanks, Jim.
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C. Boyd
76 Crestmont
East Tennessee
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| Re: [GMCnet] transmission overheating [message #188250 is a reply to message #188232] |
Thu, 25 October 2012 18:30 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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| JIM ELMER wrote on Thu, 25 October 2012 16:17 |
Help! My vehicle- -- -- 1976 palm beach which has original 455 olds
engine and transmission with about 105,000 miles. I have installed auxiliary cooler and large capacity 'Ragusa' pan, but am still getting extreme temps, even in cool weather. The engine does not overheat. I had a local tranny shop, with a good reputation (?), check the fluid flow, reported ok. Still blows fluid from vent after about 30 to 50 miles of driving. Hills are horrible. Do I need to have a rebuilt installed? If so, anyone know any good shops in the Portland,Or., to Longview, Wa area? Any
other ideas? Thanks, Jim.
|
Jim,
Welcome to the group/family/cult/asylum.....
Four things....
First, you say it is overheating, but you haven't given us any numbers to reference. And, are you sure the instrument is good? (You have heard about the vent issue from others.)
Second, we have some good suppliers. If you are considering (don't pull the trigger until the diagnostic is complete) a transmission replacement, search the GMC link for Manny Trovao. He builds transmissions for GMC motorhomes and price is good.
Third, now that you are working the forum or GMC.net, build a sig file with your name (we like to know who we are talking to), a coach description, and a geographical reference. Strangely, all of this does exist in your first post, but in the future, not everybody will remember and the last two may make a lot of difference in who can help or provide accurate information.
Lastly, I quickly found that the GMC was more a part of my life than I had expected it would be. As a waterman, I liken it to the relation we have with our boats. That is why I have taken up welcoming new owners that show up here as we would welcome a new owner or vessel in my world. So,
May the Good Lord bless this coach and all those that set forth withing her.
Welcome Jim
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] transmission overheating [message #188278 is a reply to message #188232] |
Thu, 25 October 2012 20:47 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
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Senior Member |
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| JIM ELMER wrote on Thu, 25 October 2012 13:17 |
... Still blows fluid from vent after about 30 to 50 miles of driving. Hills are horrible. Do I need to have a rebuilt installed? If so, anyone know any good shops in the Portland,Or., to Longview, Wa area? Any other ideas? Thanks, Jim.
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Jim,
I would first suspect that the transmission is overfilled. If to full the moving parts wip the fluid into a foam, making the "fluid" level even higher. It isn't very good on the transmission and yes it will cause overflow.
It is quite common for the dip-sticks to not be accurate.
The proper level happens to be the level equal with the bottom of the hole that the modulator goes into. That is why many suggest removing the modulator and checking the level after the fluid stops running out the hole. If you re-mark your dip-stick at this level you'll not need to do this messy procedure again.
Note that the torque converter holds fluid that leaks down the longer the engine is not running. This fluid from the torque converter is why the fluid seems higher on a coach that has been sitting for a while... and why transmissions seem to leak more on coaches during storage.
I also live in the Portland OR area. I might be able to help you if needed.
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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| Re: [GMCnet] transmission overheating [message #188295 is a reply to message #188250] |
Thu, 25 October 2012 22:50 |
mickeysss
Messages: 1476
Registered: January 2012
Karma: 0
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Senior Member |
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Go to manny he is honest, you get more than expected. I recommend him to anyone, he drove 10 hours to put my trans in and back the same.
from up by san fran to san diego. He did a great job. his name even sounds like tranny.
mickey
77palm beach
anaheim ca.
3.50 ratio as well. what ever that means, i think it runs right at the top of the rpm for best mileage and pulling power for a toad
and hills. it does great on the hills etc. slow but stronger than before. I think. m.
where ever you live ask him first.
On Oct 25, 2012, at 4:30 PM, Matt Colie wrote:
>
>
> JIM ELMER wrote on Thu, 25 October 2012 16:17
>> Help! My vehicle- -- -- 1976 palm beach which has original 455 olds
>> engine and transmission with about 105,000 miles. I have installed auxiliary cooler and large capacity 'Ragusa' pan, but am still getting extreme temps, even in cool weather. The engine does not overheat. I had a local tranny shop, with a good reputation (?), check the fluid flow, reported ok. Still blows fluid from vent after about 30 to 50 miles of driving. Hills are horrible. Do I need to have a rebuilt installed? If so, anyone know any good shops in the Portland,Or., to Longview, Wa area? Any
>> other ideas? Thanks, Jim.
>
> Jim,
>
> Welcome to the group/family/cult/asylum.....
>
> Four things....
> First, you say it is overheating, but you haven't given us any numbers to reference. And, are you sure the instrument is good? (You have heard about the vent issue from others.)
>
> Second, we have some good suppliers. If you are considering (don't pull the trigger until the diagnostic is complete) a transmission replacement, search the GMC link for Manny Trovao. He builds transmissions for GMC motorhomes and price is good.
>
> Third, now that you are working the forum or GMC.net, build a sig file with your name (we like to know who we are talking to), a coach description, and a geographical reference. Strangely, all of this does exist in your first post, but in the future, not everybody will remember and the last two may make a lot of difference in who can help or provide accurate information.
>
> Lastly, I quickly found that the GMC was more a part of my life than I had expected it would be. As a waterman, I liken it to the relation we have with our boats. That is why I have taken up welcoming new owners that show up here as we would welcome a new owner or vessel in my world. So,
>
> May the Good Lord bless this coach and all those that set forth withing her.
>
> Welcome Jim
>
> Matt
> --
> Matt & Mary Colie
> '73 Glacier 23 Chaumière (say show-me-air) Just about as stock as you will find
> SE Michigan - Twixt A2 and Detroit
> _______________________________________________
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| Re: [GMCnet] transmission overheating [message #188305 is a reply to message #188232] |
Fri, 26 October 2012 06:16 |
David Greenberg
Messages: 222
Registered: September 2010
Karma: 0
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Senior Member |
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You have recv'd lots of good advice here but one more consideration is
pressure building up after fluid expands. On the advice of a GM tranny
expert, I drilled a small hole at the upper end of the dip stick tube, just
below the seal. It made a huge difference and eliminated the venting issue.
On Oct 25, 2012 4:17 PM, "JIM ELMER" <jimcan.elmer@gmail.com> wrote:
> Help! My vehicle- -- -- 1976 palm beach which has original 455 olds
> engine and transmission with about 105,000 miles. I have installed
> auxillary cooler and large capacity 'Ragusa' pan, but am still getting
> extreme temps, even in cool weather. The engine does not overheat. I had a
> local tranny shop, with a good reputation (?), check the fluid flow ,
> reported ok. Still blows fluid from vent after about 30 to 50 miles of
> driving. Hills are horrible. Do I need to have a rebuilt installed? If so,
> anyone know any good shops in the Portland,Or., to Longview, Wa area? Any
> other ideas? Thanks, Jim.
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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| Re: [GMCnet] transmission overheating [message #188348 is a reply to message #188305] |
Fri, 26 October 2012 14:20 |
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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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David,
I have published this earlier, however, I decided I'd better repeat this as someone may do the same thing.
I was advised by Manny that the fill tube was part of the vent system of the trans. Double Trouble has an aftermarket extended fill
tube that comes up from the transmission at about a 45° angle from the trans to the driver side hood. The end of the dipstick has an
o-ringed seal and does not vent. After what I learned from Manny I decided that it would be a good idea to drill a hole in the tube
so it could vent. Since the hoods are not water tight I decided it would be a good idea to drill the hole in the bottom of the tube.
Using a 90° drill I drilled a 1/4" hole in the bottom below the end of the plug. I was very proud of myself that I didn't have to
take the tube out to drill the hole.
You've probably figger'd out what happened the first time I went to add fluid to the trans; I had a nice stream of fluid run out of
the hole as I added fluid. I wound up cleaning up the mess and taping the hole up.
Regards,
Rob M.
-----Original Message-----
From: David Greenberg
You have recv'd lots of good advice here but one more consideration is
pressure building up after fluid expands. On the advice of a GM tranny
expert, I drilled a small hole at the upper end of the dip stick tube, just
below the seal. It made a huge difference and eliminated the venting issue.
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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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