Coolant bypass on the back leaking - Lexus IS Forum
User Tag List

 
LinkBack Thread Tools
post #1 of 8 (permalink) Old 04-21-2019, 07:41 AM Thread Starter
Newbie
 
Join Date: Jul 2017
Location: Atlanta
Posts: 35
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 14 Post(s)
 
Coolant bypass on the back leaking

Hey my coolant bypass on the back of the water pump is leaking after a timing belt service. It’s got a gasket and I just put a little more torque on it. Is there anything fancy to this? The gasket felt like it was metallic almost and maybe had a direction to it? I couldn’t find much info when I installed it. Any help is appreciated!
Attached Thumbnails
Click image for larger version

Name:	47C047D2-F3F8-4943-8DAD-AA1F6CC88AFB_1555853966695.jpeg
Views:	35
Size:	1.08 MB
ID:	124059  
trowe2 is offline  
Sponsored Links
Advertisement
 
post #2 of 8 (permalink) Old 04-21-2019, 08:19 AM
Frequenter
 
Join Date: Mar 2016
Posts: 230
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 85 Post(s)
 
The gasket is not directional, it is a metal shim style. Sounds like your sealing surfaces were not clean and flat prior to assembly.

Recommend disassembling, clean & inspect, and reassemble.
Hodgdon Extreme is offline  
post #3 of 8 (permalink) Old 04-21-2019, 09:45 AM Thread Starter
Newbie
 
Join Date: Jul 2017
Location: Atlanta
Posts: 35
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 14 Post(s)
 
I scrubbed it and hit it with some 220 grit sand paper when it was off the car. Is there anything else I can do to sure it up? Like add sealant or something?

Also it isn't leaking a little, its leaking a good amount. If the mating surfaces were a little dirty it would be a small drip

Last edited by trowe2; 04-21-2019 at 10:33 AM.
trowe2 is offline  
 
post #4 of 8 (permalink) Old 04-21-2019, 02:51 PM
Loyalist
 
Join Date: Dec 2010
Location: Marietta
Posts: 1,531
Mentioned: 0 Post(s)
Tagged: 1 Thread(s)
Quoted: 362 Post(s)
           
Quote:
Originally Posted by trowe2 View Post
I scrubbed it and hit it with some 220 grit sand paper when it was off the car. Is there anything else I can do to sure it up? Like add sealant or something?

Also it isn't leaking a little, its leaking a good amount. If the mating surfaces were a little dirty it would be a small drip
I always put a slight film of RTV on mine when reassemble.

Careful & Consistent
01 SolarYellow is online now  
post #5 of 8 (permalink) Old 04-21-2019, 03:08 PM
Frequenter
 
Join Date: Mar 2016
Posts: 230
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 85 Post(s)
 
It's a simple two bolt flange. Obviously the two sealing faces are not coming to bear on one another with enough force, or squarely enough...

Adding sealer to the outside of a leaking joint is not the answer. You can use sealer during assembly, but it is absolutely not required.

Disassemble, inspect, repair problem and reassemble.
Hodgdon Extreme is offline  
post #6 of 8 (permalink) Old 04-21-2019, 04:13 PM Thread Starter
Newbie
 
Join Date: Jul 2017
Location: Atlanta
Posts: 35
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 14 Post(s)
 
I tried like the dickens to get that pipe off with everything assembled. I’m guessing I have to tear it all down again to be able to unhook it. Is that right or can you think of a way to get access to those surfaces?
trowe2 is offline  
post #7 of 8 (permalink) Old 04-22-2019, 02:21 PM
Frequenter
 
Join Date: Jun 2008
Location: Phoenix, AZ
Posts: 229
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 79 Post(s)
 
Doesn't this connection have an o-ring? If this is the same one I'm thinking of, some people forget to make sure the old o-ring is taken out before replacing it and re-installing the part. I could be wrong on the part though.
allturbo98 is offline  
post #8 of 8 (permalink) Old 04-22-2019, 03:01 PM Thread Starter
Newbie
 
Join Date: Jul 2017
Location: Atlanta
Posts: 35
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 14 Post(s)
 
No o-ring. It has the metal shim gasket like someone mentioned above. It is the pipe that runs under the header to the back of the engine bay where a rubber hose runs coolant through the fire wall. I'm thinking I can maybe get that hose off and slide the pipe backwards on the studs. I'll make an attempt tonight.
trowe2 is offline  
Sponsored Links
Advertisement
 
Reply

  Lexus IS Forum > 1st-Gen IS300 > General Discussion

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Lexus IS Forum forums, you must first register.
Please enter your desired user 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. If your address is invalid, you will likely lose access to the site.

Email Address:
OR

Log-in











Current users viewing this Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Bypass coolant running through throttle body? Dsthez General Discussion 1 04-14-2019 06:26 PM
Coolant Leak Adam_AntiAir General Discussion 2 02-18-2019 07:59 PM
2002 IS300 manual leaking coolant sombo1 General Discussion 1 07-31-2016 12:48 PM
Help please, Leaking Coolant Be.Parker Basic Help & Repair 2 03-17-2016 03:09 PM
Coolant Leaking? Better check your Rad Cap pjmorozov General Discussion 3 01-20-2016 09:18 AM

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

 
For the best viewing experience please update your browser to Google Chrome