T-350 leaks... pump? - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 11-21-2009, 01:04 AM
Registered User
 
Last photo:
Join Date: Oct 2009
Location: Jersey City, NJ
Posts: 19
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
T-350 leaks... pump?

Hey, 79 Camaro with a TH350 here and leaks all over the place.. I recently replaced the stock shifter with a B&M Z-Gate and popped the pan back in with a brand new filter + gasket set.. no leaks from the pan itself but there seems to be a trickle coming from behind the torque converter. I only noticed because reverse decided to stop working and when I checked the oil level it seemed a little low. I uploaded a video onto youtube today when I got under there to check what was going on.. is that the pump on the transmission leaking?

Youtube video link.. CLICK HERE

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 11-21-2009, 05:38 AM
SSedan64's Avatar
Registered User
 
Last photo:
Join Date: Dec 2007
Location: Macon, GA.
Age: 50
Posts: 6,016
Wiki Edits: 0

Thanks: 0
Thanked 46 Times in 46 Posts
Yep, looks like the Pump seal where the Converter hub goes in.> http://th350.netfirms.com/browser.htm
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 11-21-2009, 09:23 AM
Registered User
 
Join Date: Nov 2009
Location: Ft Worth, TX.
Posts: 86
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I agree that it is probably the seal but while you have the converter out take it to a local converter shop and have it leak checked. A crack in the hub weld will appear the same. It is called insurance.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 11-21-2009, 11:11 AM
Rexnfx's Avatar
Registered User
 
Last photo:
Join Date: Nov 2009
Location: Washington State
Posts: 140
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Usually, the pump(converter hub) seal will allow the fluid to be slung around the spinning converter. You are probably leaking through the pump gasket and O-ring. Put a wrench on the lower pump bolts and see if loose.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 11-21-2009, 11:28 AM
Crosley's Avatar
Hotrodders.com Moderator
 
Last wiki edit: T-350 rebuild tech
Last journal entry: Morris update 9-28-2014
Last photo:
Join Date: Nov 2002
Location: ... USA
Posts: 8,182
Wiki Edits: 1659

Thanks: 416
Thanked 107 Times in 103 Posts
normally the pump hub seal will not leak if it is still soft since pressure behind it helps the seal to hold.'

if the pump bushing has moved forward into the back side of the seal , it will leak a good amount. Or perhaps the seal has partially moved out of the pump body... all unknown till the unit is inspected

I'd try the easy stuff first as mentioned here with pump bolts and stuff before removal of the trans and converter
__________________
Some people are like Slinkies... Not really good for anything, but they still bring a smile to your face when you push them down a flight of stairs.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 12-18-2009, 11:16 PM
Registered User
 
Last photo:
Join Date: Oct 2009
Location: Jersey City, NJ
Posts: 19
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Ok I've decided to finally drop the tranny and get to work. I got a TH350 rebuild manual so I'm hoping that will help. Anyone know a vendor online for the gasket/o-rings/sealer I need? I read it would be wise to replace the converter to pump bushing as well? If I've got it right, the front seal and bushing is at the red arrows I marked in the pic.. should I attempt to replace the gaskets/o-rings in the blue?



I'm really reluctant about bringing the tranny to a shop. One shop said $75 but they were iffy on what the problem was in the first place. Aamco is asking $150 and the guy was friendly and knew all about the transmission. Either way I don't see that logical to pay $140 to install a $10 part I can do myself in 30 minutes. Anyway, your help is appreciated, thanks guys!
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 12-19-2009, 12:23 PM
Crosley's Avatar
Hotrodders.com Moderator
 
Last wiki edit: T-350 rebuild tech
Last journal entry: Morris update 9-28-2014
Last photo:
Join Date: Nov 2002
Location: ... USA
Posts: 8,182
Wiki Edits: 1659

Thanks: 416
Thanked 107 Times in 103 Posts
replace bushing and check converter hub too.

parts ; 2 , 3 , 9 , 15 (gasket) , 23 ( bolt washer) are leak areas


13, 14 part numbers are sealing rings and #17 lip seal for piston 2nd gear apply... these will not leak outside the trasnmittin
__________________
Some people are like Slinkies... Not really good for anything, but they still bring a smile to your face when you push them down a flight of stairs.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 12-19-2009, 01:54 PM
Registered User
 
Last photo:
Join Date: Oct 2009
Location: Jersey City, NJ
Posts: 19
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Ok, looks fairly simple to replace looking at the blowup diagram. Anyone know who supplies these parts?
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 12-20-2009, 02:27 PM
SSedan64's Avatar
Registered User
 
Last photo:
Join Date: Dec 2007
Location: Macon, GA.
Age: 50
Posts: 6,016
Wiki Edits: 0

Thanks: 0
Thanked 46 Times in 46 Posts
Quote:
Originally Posted by wakawu
Ok, looks fairly simple to replace looking at the blowup diagram. Anyone know who supplies these parts?
All the gaskets & seals come in an Overhaul Kit about $30. The bushing will need to be ordered seperately about $1. Here's a few sites or you can buy them at your local Trans parts house.
http://www.makcotransmissionparts.com/350-350C.html
http://www.transmissionpartsusa.com/...arts_s/598.htm
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 12-20-2009, 10:45 PM
Registered User
 
Last photo:
Join Date: Oct 2009
Location: Jersey City, NJ
Posts: 19
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
$30? I'd imagine these were all the parts I needed.. hardly $4 total.. what does that kit include that I really need?

Bushing
pump seal
oring
gasket
washer seals
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 12-21-2009, 06:52 AM
SSedan64's Avatar
Registered User
 
Last photo:
Join Date: Dec 2007
Location: Macon, GA.
Age: 50
Posts: 6,016
Wiki Edits: 0

Thanks: 0
Thanked 46 Times in 46 Posts
The Overhaul Kit contains all gaskets & seals, internal & external. Just in case you need to replace other seals now or later. If you don't have any other leaks you can get only what's needed.
Reply With Quote Quick reply to this message

Recent Transmission - Rearend posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
350 trans leaks tmcadman Transmission - Rearend 4 02-15-2012 01:17 PM
turbo 350 leaks scottponykilla Transmission - Rearend 1 11-19-2010 11:05 PM
350 turbo leaks mike1956210 Transmission - Rearend 2 06-09-2007 12:09 PM
TH 350 leaks and can't find where... Augusto Transmission - Rearend 6 08-29-2006 11:40 AM
Cross leaks in the 4L80 pump. Jason Transmission - Rearend 2 09-28-2003 07:46 PM


All times are GMT -6. The time now is 02:59 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.