| Trans fluid overflow [message #320805] |
Fri, 21 July 2017 18:14  |
George B.
Messages: 213
Registered: February 2012
Karma: 1
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Senior Member |
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After a trans rebuild at shop far away, had lots of fluid spilling out the vent on top of the trans. I have conflicting information about checking the proper level by taking off the modulator on the side of the trans. I drove the coach and got it warmed up. Right away removed the modulator and about two quarts of fluid came out. Some say that would indicate too much fluid was in there and now it is at the proper level. Others say that I am draining the extra fluid from the torque converter. With the two quarts removed it still shifts fine and does not slip. I think I took too much out. What gives?
George Butts
Las Vegas Nevada
73 "Custom 26' Q" & 76 23' Birchaven
71 Honda 600 Coupe & 01 Tracker Toads
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| Re: Trans fluid overflow [message #320821 is a reply to message #320805] |
Fri, 21 July 2017 22:30  |
Bullitthead
Messages: 1411
Registered: November 2013
Karma: 5
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Senior Member |
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The bottom of the bore for the modulator is the proper level when the pump (converter) is running and trans is in park. After operation ceases, fluid will drain back out of the pump and raise the level to the top of the modulator bore. You can pull the modulator out while it's running, but don't pull it all the way out, just past the o-ring seal to let excess fluid run out. May require cajones and skill to deal with operating machinery and hot fluids, be careful. Once you get that fluid level, check and mark your dipstick for easier future maintenance.
Terry Kelpien
ASE Master Technician
73 Glacier 260
Smithfield, Va.
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| Re: Trans fluid overflow [message #320823 is a reply to message #320821] |
Sat, 22 July 2017 01:51 |
George B.
Messages: 213
Registered: February 2012
Karma: 1
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Senior Member |
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Thanks for clearing this up for me. I was half way there.
George Butts
Las Vegas Nevada
73 "Custom 26' Q" & 76 23' Birchaven
71 Honda 600 Coupe & 01 Tracker Toads
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| Re: Trans fluid overflow [message #320831 is a reply to message #320805] |
Sat, 22 July 2017 09:12 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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Since correct full level is determined modulator loose, engine running, instead just fiollow the rescribe proceedure on the stick. Off- pull modulator and set level to spilling over point. Mark your dipstick to this new "full hot" level. Button up, start and add fluid to new mark. The whole converter drain back thing is just confusing and irrelivant if you scribe the stick with the modulator out as that is the spill over level.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] Trans fluid overflow [message #321019 is a reply to message #320831] |
Mon, 24 July 2017 21:34 |
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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,
I sent this in awhile back.
REMOTE TRANSMISSION DIPSTICK CALIBRATION
You will need the following items to perform this procedure:
1) Three ton jack stands - 2 ea.
2) Rags
3) Oil drain pan
4) Tool capable of removing existing marks on transmission dipstick
5) Tool capable of remarking transmission dipstick
6) Half inch (1/2") socket, extension, and ratchet to remove / reinstall modulator retainer
7) Transmission fluid
8) Mechanics gloves (to handle hot parts)
Comments:
1) Before you start this procedure look at the passenger side of the transmission and locate the modulator (Ref: Parts Book 78Z -
TRANSMISSION - Pg. 17-2 Key 6 Modulator.
2) Manny Trovao has reviewed this procedure and "blessed" it.
3) You need to do the checking fairly quickly after stopping when the engine and transmission are HOT!
Procedure:
1) Park your GMC on a level surface
2) Set the parking brake
3) Set the suspension system to TRAVEL
4) Start the engine and allow coach to reach TRAVEL height
5) Depress the brake pedal
6) Cycle the transmission lever through all the positions back and forth several times slowly
7) Return the transmission to PARK
8) Leave the engine running and check the fluid level of the transmission
9) The fluid level should be at the "COLD" line if not slowly and carefully fill the transmission to that level
10) Get back in the coach and drive it long enough for the engine and transmission to come to normal operating temperature
11) Park the GMC on a level surface
12) Put the transmission in Park and set the parking brake
13) With the engine running check the fluid level of the transmission; if it's not on the HOT mark continue as below
14) Shut the engine off and place jack stands under the frame so that if a torsion bar were to fail you won't get crushed.
15) Be careful from this point onwards not to burn yourself on the HOT exhaust pipes
16) Place a drain pan under the modulator on the passenger side of the transmission
17) Remove the rubber vacuum line
18) Remove the bolt that holds the modulator retainer to the transmission using the half inch socket, extension, and ratchet
19) Remove the modulator (be careful it will be HOT)
20) Allow fluid to drain into the pan until it just drips (be careful, the fluid will be HOT!)
21) If fluid does not drip out add it slowly until it does
22) Re-install the modulator, hose, and retaining screw
23) Remove the drain pan and jack stands
24) Get back in the GMC, start the engine and drive the GMC until the engine and transmission are at normal operating temperature
25) Park the GMC on a level surface
26) Set the hand brake and put the transmission in Park
27) Check the level on the dipstick, it should be at or near the "HOT" mark; if not note where it is
28) Remove the existing "HOT" mark on the dipstick and mark it at the correct level
29) Allow the transmission to cool overnight
30) Start the engine the next day and cycle the transmission lever through all the positions back and forth several times slowly
31) Check the level on the dipstick, it should be at or near the "COLD" mark; if not note where it is
32) Remove the existing "COLD" mark on the dipstick and mark it at the correct level
If I missed anything or what I've written isn't clear PLEASE let me know.
Regards,
Rob M.
USAussie
Sydney, Australia
Regards,
Rob M.
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of John R. Lebetski
Sent: Sunday, July 23, 2017 12:13 AM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Trans fluid overflow
Since correct full level is determined modulator loose, engine running, instead just fiollow the rescribe proceedure on the stick.
Off- pull modulator
and set level to spilling over point. Mark your dipstick to this new "full hot" level. Button up, start and add fluid to new mark.
The whole
converter drain back thing is just confusing and irrelivant if you scribe the stick with the modulator out as that is the spill over
level.
--
John Lebetski
Woodstock, IL
77 Eleganza II
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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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