| [GMCnet] Checking tranny fluid level [message #294371] |
Mon, 25 January 2016 10:37  |
emerystora
Messages: 4442
Registered: January 2004
Karma: 13
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I have asked someone this question but haven't heard back yet.
Someone has asked me whether the transmission fluid should be hot or cold to check the level by taking out the vacuum modulator. I know they should at least run it for a short time to fill the torque converter but I wasn't sure about the temp of the fluid. Should he do this hot or cold?
Emery Stora
77 Kingsley
FrederickCO
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| Re: [GMCnet] Checking tranny fluid level [message #294385 is a reply to message #294371] |
Mon, 25 January 2016 12:52  |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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The removed modulator is just a fill overspill exercise to scribe the dip stick FULL mark. Just like filling a rear where it spills over to indicate full. THEN you button it up, start it, set initial level to cold level, and warm it up, drive it and check the level running warm in park. I you stop at step one you will be underfilled as level drops running in park compared to off. Then the level rises at it gets to operation temp and you get the final set point adjusted.
So the level spill over part of the dipstick cal is easier when not scalding.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] Checking tranny fluid level [message #294393 is a reply to message #294371] |
Mon, 25 January 2016 14:11 |
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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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Emery,
Here's an email I've sent in a couple of times.
Regards,
Rob
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Robert Mueller
Sent: Wednesday, April 22, 2015 8:03 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Tranny fluid check via modulator question
G'day,
Below is an email I sent in on February 27, 2014 and asked people to review it. I have edited it taking into consideration comments
that were received.
Once again feel free to comment or criticize.
G'day,
I called Manny and ran this past him and he blessed it.
REMOTE TRANSMISSION dipstick CALIBRATION
NOTE: This procedure is written for vehicles with Left Hand Drive, if your GMC is Right Hand Drive the location of the transmission
modulator is on the driver side.
You will need the following items to perform this procedure:
1) Three ton jack stands - 4 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
Procedure:
Comments: 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.
NOTE: You need to do the checking fairly quickly after stopping when the engine and transmission are HOT!
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
Note: if you're girth is large you will probably have to jack the GMC up (front and rear) level to gain access to the
modulator
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 and retainer and hose
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
Maintenance Manual X-7525
SECTION 0 - GENERAL INFORMATION, PERIODIC MAINTENANCE AND LUBRICATION
Page 0-13 - TRANSMISSION
If I missed anything or what I've written isn't clear PLEASE let me know.
Regards,
Rob M.
The Pedantic Mechanic
-----Original Message-----
From: Emery Stora
I have asked someone this question but haven't heard back yet.
Someone has asked me whether the transmission fluid should be hot or cold to check the level by taking out the vacuum modulator. I
know they should at least run it for a short time to fill the torque converter but I wasn't sure about the temp of the fluid. Should
he do this hot or cold?
Emery
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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] Checking tranny fluid level [message #294410 is a reply to message #294378] |
Mon, 25 January 2016 17:41 |
Emery Stora
Messages: 959
Registered: January 2011
Karma: 4
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Senior Member |
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Thanks Gene. I talked with Manny and he says to drive it and work it through all the gears and then when you get back from your drive quickly remove the vacuum modulator
and drain off the fluid until it just stops dripping. That is the proper level in the tranny when the fluid is hot.
Emery Stora
> On Jan 25, 2016, at 11:10 AM, gene Fisher wrote:
>
> Hot
>
> Call manny😀
>
> On Monday, January 25, 2016, Emery Stora wrote:
>
>> I have asked someone this question but haven't heard back yet.
>>
>> Someone has asked me whether the transmission fluid should be hot or cold
>> to check the level by taking out the vacuum modulator. I know they should
>> at least run it for a short time to fill the torque converter but I wasn't
>> sure about the temp of the fluid. Should he do this hot or cold?
>>
>> Emery Stora
>> 77 Kingsley
>> FrederickCO
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
>
>
> --
> Gene Fisher -- 74-23,77PB/ore/ca
> “Give a man a fish; you have fed him for today --- give him a URL and
> -------
> http://gmcmotorhome.info/
> Alternator Protection Cable
> http://gmcmotorhome.info/APC.html
> _______________________________________________
> GMCnet mailing list
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> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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