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DIY : Flex Pipe Replacement

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Old 06-27-14, 10:28 AM   #1
hypervish
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Default DIY : Flex Pipe Replacement

Hey all, my flex pipe has been leaking for quite sometime but Tuesday it decided to fail completely. Using a discount code at Advanced Auto Parts I was able to pick up the flex pipe and seals all for only $64.69. It beat RockAuto's price by close to $10 and I didn't have to wait for shipping.

I soaked all 4 bolts in WD-40 for 3 nights in a row. Each night I'd come out and spray the bolts down before going to bed. This worked out well as I didn't break a single bolt, which was my main concern.

You will need:
  1. WD-40 or PB Blaster
  2. Walker Flex Pipe - Part 53421
  3. Walker Exhaust Gasket - Part 31374
  4. Walker Exhaust Gasket - Part 31332
  5. 14MM or 9/16 Socket & Wrench
  6. 14MM or 9/16 Box End Wrench
  7. Optional But Recommended : Toyota # 90080-17187 (NUT for Rear Flex Pipe Connection)
  8. Optional But Recommended : Toyota # 91512-81035 (BOLT for Rear Flex Pipe Connection)
NOTE: The front nut looks to be welded to the flange, so I did not replace it or the bolt as they were in good enough condition.

Here's the old Flex Pipe, you can see where it broke:
Click the image to open in full size.

First attack the rear bolts (14mm or 9/16), they are the most difficult to access. I had the most difficulty with the driver side rear bolt (the one with the socket on it):
Click the image to open in full size.

Then go the front bolts (14mm or 9/16):
Click the image to open in full size.

Here's the old nut on the rear flex pipe connection, there was just no way I was going to re-use this:
Click the image to open in full size.

Comparing the old Flex Pipe to new Flex Pipe, ensuring proper fitment. As you can see they are exactly alike:
Click the image to open in full size.

Gasket 31374 goes on the rear side, it's easiest to put the gasket onto this pipe first and then install it into place. I installed the rear side first, and then moved to the front:
Click the image to open in full size.

Gasket 31332 goes on the front side, easiest to place it on the exhaust flange and then place the flex pipe onto it during installation:
Click the image to open in full size.

Start the car up and check for leaks!
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Old 06-27-14, 12:07 PM   #2
lexina
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Thanks for sharing. I am glad you got the rusted bolts out of the old pipe.
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Old 06-27-14, 02:41 PM   #3
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Originally Posted by lexina View Post
Thanks for sharing. I am glad you got the rusted bolts out of the old pipe.
You're welcome!

Yep, i was extremely pleased that I didn't break any bolts. With my luck I was expecting at least two bolts to break. lol
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Old 06-27-14, 04:01 PM   #4
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Good post. Generally the nut or the bolt is welded on Lexus exhausts. With that much rust it is hard to figure out which is welded.

Do add to the DIY please.

Salim
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Old 06-27-14, 05:15 PM   #5
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Quote:
Originally Posted by salimshah View Post
Good post. Generally the nut or the bolt is welded on Lexus exhausts. With that much rust it is hard to figure out which is welded.

Do add to the DIY please.

Salim
Using a wire cup brush attachment on my cordless drill helps me often to clean up any rust on exhaust parts and help identify those hidden surprise welded nuts.

Also another tip that works well on those frozen exhaust nuts/bolts is to spray them while the exhaust is warm. The micro-expanded bolts allow the penetrants to seep in the threads a little better.
PBblaster, Liquid wrench and used transmission fluid work well. I find WD40 the least effective as a penetrant.


@Hypervish..how many miles did you have on your RX before the flex joint blew out?
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Old 06-27-14, 07:56 PM   #6
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Quote:
Originally Posted by salimshah View Post
Good post. Generally the nut or the bolt is welded on Lexus exhausts. With that much rust it is hard to figure out which is welded.

Do add to the DIY please.

Salim
Thanks for the reminder, will add now!
Quote:
Originally Posted by fastnoypi View Post
Using a wire cup brush attachment on my cordless drill helps me often to clean up any rust on exhaust parts and help identify those hidden surprise welded nuts.

Also another tip that works well on those frozen exhaust nuts/bolts is to spray them while the exhaust is warm. The micro-expanded bolts allow the penetrants to seep in the threads a little better.
PBblaster, Liquid wrench and used transmission fluid work well. I find WD40 the least effective as a penetrant.


@Hypervish..how many miles did you have on your RX before the flex joint blew out?
The flex pipe completely blew this Tuesday at 208,674 miles. It's been leaking for awhile, but very slightly. Hardly noticeable for maybe 10k miles.
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Old 06-27-14, 09:12 PM   #7
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Nice information. Mine still looks pretty good, so I wonder if it was replaced at some time???
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Old 06-28-14, 07:22 AM   #8
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Nice job Hyper.
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Old 06-29-14, 07:27 PM   #9
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That looks great and seems a lot of work. I paid $40 to my local muffler shop and he cut the old one out and welded a new on in. I definitely see NO performance difference. Just sayin. I guess I just took the path of least resistance.

Last edited by BertNelson; 06-29-14 at 07:34 PM..
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Old 09-11-14, 03:18 PM   #10
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Do I need to lube the gasket ?
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Old 09-11-14, 06:41 PM   #11
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very impressed with your photos, extremely clear and detailed....what did you use a camera or phone.?
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Old 09-11-14, 07:36 PM   #12
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Quote:
Originally Posted by mroxas View Post
Do I need to lube the gasket ?
No need to lube the gasket, just install it dry.

Quote:
Originally Posted by thomas1 View Post
very impressed with your photos, extremely clear and detailed....what did you use a camera or phone.?
Thank you! I used my iPhone 5s to take all the shots.
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Old 09-11-14, 07:36 PM
 
 
 
 
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