| Transmission Vent [message #274406] |
Thu, 26 March 2015 18:16  |
Darryl
Messages: 144
Registered: December 2011
Location: Northern California
Karma: 0
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On my recent trip to Death Valley I had a couple of episodes of smoke billowing out from under the coach while climbing a mountain grade in first or second gear under full throttle while pulling the Tracker. I had recently had the transmission cooler lines replaced and I'm attributing the smoke to the transmission having been overfilled and venting excess fluid on the hard climbs. So, I figured it was time (probably past time) to install the transmission vent elbow to direct the flow of transmission fluid away from the headers and other hot surfaces.
I got the part from Jim K, found the vent and pried the "top hat" off. I expected to find an opening that I could press the "threaded" or "barbed" end of the elbow into. Instead, I found a very short tube about the same diameter as the elbow, maybe 3/8 inch. I'm guessing this short tube has to come out and that the elbow presses into the hole it leaves behind. Am I on the wrong track? Will it come out if I grab it with a pair of pliers and work it loose or is there a more elegant method? This doesn't look like a reversible operation so I'd like to do it right the first time.
Darryl
Darryl Meyers
1978 Eleganza II
El Dorado Hills, CA
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| Re: [GMCnet] Transmission Vent [message #274412 is a reply to message #274406] |
Thu, 26 March 2015 20:21  |
emerystora
Messages: 4442
Registered: January 2004
Karma: 13
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Senior Member |
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Yes, you have to take out the short tube the cap fit on.
If you can get small vise grips on it you can then put a screw driver beneath the vise grips and pry them up to pull the tube.
The you press the elbow into the opening. You’ll probably have to put a large screwdriver or a flat metal piece over it to leverage the elbow down into the hole.
Emery Stora
> On Mar 26, 2015, at 5:16 PM, Darryl Meyers wrote:
>
> On my recent trip to Death Valley I had a couple of episodes of smoke billowing out from under the coach while climbing a mountain grade in first or
> second gear under full throttle while pulling the Tracker. I had recently had the transmission cooler lines replaced and I'm attributing the smoke to
> the transmission having been overfilled and venting excess fluid on the hard climbs. So, I figured it was time (probably past time) to install the
> transmission vent elbow to direct the flow of transmission fluid away from the headers and other hot surfaces.
>
> I got the part from Jim K, found the vent and pried the "top hat" off. I expected to find an opening that I could press the "threaded" or "barbed"
> end of the elbow into. Instead, I found a very short tube about the same diameter as the elbow, maybe 3/8 inch. I'm guessing this short tube has to
> come out and that the elbow presses into the hole it leaves behind. Am I on the wrong track? Will it come out if I grab it with a pair of pliers and
> work it loose or is there a more elegant method? This doesn't look like a reversible operation so I'd like to do it right the first time.
>
> Darryl
> --
> Darryl Meyers
>
> 1978 Eleganza II
>
> El Dorado Hills, CA
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| Re: Transmission Vent [message #274431 is a reply to message #274406] |
Fri, 27 March 2015 11:15 |
Darryl
Messages: 144
Registered: December 2011
Location: Northern California
Karma: 0
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Thanks, Emery. I hadn't thought about being able to get some leverage on it by using a vice grip and screw-driver.
Darryl Meyers
1978 Eleganza II
El Dorado Hills, CA
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| Re: [GMCnet] Transmission Vent [message #274432 is a reply to message #274431] |
Fri, 27 March 2015 12:48 |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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Give it a little twist back n forth while pryin if you have the access. I
did mine with trams out and worked for me.
Sully
On Friday, March 27, 2015, Darryl Meyers wrote:
> Thanks, Emery. I hadn't thought about being able to get some leverage on
> it by using a vice grip and screw-driver.
> --
> Darryl Meyers
>
> 1978 Eleganza II
>
> El Dorado Hills, CA
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| Re: Transmission Vent [message #274468 is a reply to message #274406] |
Fri, 27 March 2015 19:40 |
Darryl
Messages: 144
Registered: December 2011
Location: Northern California
Karma: 0
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Sully, having the transmission out would be sooo much easier. I finally jacked up the front end of the coach and pulled the left front wheel and dropped the fender liner. Working from below I was able to get a small long-nose vice grip onto the tube below the flange at the top. Then I was able to slide a large screwdriver under the vice grips and lever it down and it popped off.
Next problem is to press the elbow into the hole. Working at arms length I can't get any leverage from below so I went back into the coach. Leverage is better from above but it's going to take the right lever and figuring out a make-shift fulcrum and protecting the little pipe and . . . After a couple of hours I called it a day. I'll get back to it tomorrow.
Darryl
Darryl Meyers
1978 Eleganza II
El Dorado Hills, CA
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| Re: [GMCnet] Transmission Vent [message #275018 is a reply to message #274470] |
Sat, 04 April 2015 20:14 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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When I installed the vent elbow many years ago I ran the tube into a medium
sized pill bottle mounted on the rear of the #3 (transmission)
crossmember. It's never collected more than 1/4" of ATF, which is more
reassuring than wondering how much drained out on the road.
Ken H.
On Fri, Mar 27, 2015 at 9:06 PM, Rob Mueller
wrote:
> Sully,
>
> Ken Frey tapped out the trans vent hole to 1/8" pipe with the trans in
> place on Double Trouble.
>
> Take a look at it and you'll see it's not that hard.
>
> Once it's tapped it's quite easy to screw a 1/4" flareless fitting to 1/8"
> pipe 90° elbow into the trans case and running a 1/4"
> nylon tube (as used in the rear suspension) over to the drivers side of
> the coach and tie wrapping it to the frame.
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: Transmission Vent [message #275023 is a reply to message #274406] |
Sat, 04 April 2015 21:18 |
Darryl
Messages: 144
Registered: December 2011
Location: Northern California
Karma: 0
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I finally got it done. Trying to work on that vent under the step was difficult, at least for me. I struggled for a while trying to figure out how to get any leverage to "press" the new vent into the hole without destroying the elbow. I finally realized I could get a long screwdriver onto the vent at about a 45 degree angle from above. More of an angle than I would have preferred but a couple of hard raps with a hammer on the end of the screwdriver seems to have seated it. Then I ran about four feet of 1/4 in ID line to the outside of the frame. If I think of it I may go back and put a collection bottle of some kind on the end of the line as Ken suggests. I was really more concerned about keeping any fluid away from the headers and mufflers than keeping track of how much was venting but it would be good information.
Darryl
Darryl Meyers
1978 Eleganza II
El Dorado Hills, CA
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| Re: Transmission Vent [message #275033 is a reply to message #274406] |
Sat, 04 April 2015 22:33 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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Senior Member |
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Darryl wrote on Thu, 26 March 2015 17:16On my recent trip to Death Valley I had a couple of episodes of smoke billowing out from under the coach while climbing a mountain grade in first or second gear under full throttle while pulling the Tracker. I had recently had the transmission cooler lines replaced and I'm attributing the smoke to the transmission having been overfilled and venting excess fluid on the hard climbs. So, I figured it was time (probably past time) to install the transmission vent elbow to direct the flow of transmission fluid away from the headers and other hot surfaces.
I got the part from Jim K, found the vent and pried the "top hat" off. I expected to find an opening that I could press the "threaded" or "barbed" end of the elbow into. Instead, I found a very short tube about the same diameter as the elbow, maybe 3/8 inch. I'm guessing this short tube has to come out and that the elbow presses into the hole it leaves behind. Am I on the wrong track? Will it come out if I grab it with a pair of pliers and work it loose or is there a more elegant method? This doesn't look like a reversible operation so I'd like to do it right the first time.
Darryl
If you have fluid puking out of the vent, something is dramatically wrong. Rather than figuring out how to manage the puking, you need to find out what is wrong with your tranny. It will only get worse and bite you in the Ass when you are in the middle of no where.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] Transmission Vent [message #275039 is a reply to message #275033] |
Sat, 04 April 2015 23:44 |
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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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Bob,
I reckon Daryl could be correct when he noted "I'm attributing the smoke to the transmission having been overfilled and venting
excess fluid on the hard climbs."
Here's my analysis of Daryl's problem, please correct me if I make any dubious statements.
When I had the chain case cover off of the spare trannies I have in Houston I noted that the internal part of that vent is a bit
above the chain (Ref. MM X-7525 / Section 7 - Transmission / page 7-6 / Figure 6 - Case Oil Passages - Rear. Note the VENT). Note
that the "open" side of the vent is facing to the left and downwards.
The figure noted above is a view from the rear therefore the chain sprockets are turning clockwise. The full oil fill level of the
transmission when static is at the bottom of the modulator when removed. The modulator is located slightly above the mounting flange
of the transmission pan. It is quite possible that the puking is a result of overfilling which resulted in an excess depth of fluid
in the chain case. That could cause the chain to pickup "extra" oil and sling it into the downward facing vent cover. Furthermore I
interpret "hard climbs" to mean the coach was nose high going up a grade which could increase the amount of fluid in the chain case.
Finally if it was a hard climb maybe the transmission was in Super which would increase the speed of the chain as it traveled around
the sprockets. Normally I'd call Manny but since it's Easter Sunday I am loathe to do that.
Regards,
Rob M.
-----Original Message-----
From: Bob de Kruyff
If you have fluid puking out of the vent, something is dramatically wrong. Rather than figuring out how to manage the puking, you
need to find out what is wrong with your tranny. It will only get worse and bite you in the Ass when you are in the middle of no
where.
--
Bob
Darryl wrote on Thu, 26 March 2015 17:16
On my recent trip to Death Valley I had a couple of episodes of smoke billowing out from under the coach while climbing a mountain
grade in first or second gear under full throttle while pulling the Tracker. I had recently had the transmission cooler lines
replaced and I'm attributing the smoke to the transmission having been overfilled and venting excess fluid on the hard climbs. So,
I figured it was time (probably past time) to install the transmission vent elbow to direct the flow of transmission fluid away from
the headers and other hot surfaces.
I got the part from Jim K, found the vent and pried the "top hat" off. I expected to find an opening that I could press the
"threaded" or "barbed" end of the elbow into. Instead, I found a very short tube about the same diameter as the elbow, maybe 3/8
inch. I'm guessing this short tube has to come out and that the elbow presses into the hole it leaves behind. Am I on the wrong
track? Will it come out if I grab it with a pair of pliers and work it loose or is there a more elegant method? This doesn't look
like a reversible operation so I'd like to do it right the first time.
Darryl
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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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