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post #1 of 12 (permalink) Old 03-19-2017, 08:32 PM Thread Starter
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Water leaking from exhaust pipe

2015 Tundra SR5 TRD with the 5.7L engine. 28K miles.

This morning I noticed a puddle under the middle of my truck. It had been sitting in that position idling as I was hitching the trailer. Another puddle showed up when I got home and the truck was idling. The water is dripping from a joint in the exhaust system just behind what is either the cat converter or the muffler (I"m not sure which). The joint appears to be covered with a clamp of some sort. This joint is under the front end of the truck bed.

I know this water is condensate from the fuel burned in the engine. I'm accustomed to seeing a little drip from the end of the tail pipe, but water dripping from the middle of the exhaust system is not normal in my experience.

This water drip was before and after a 30 mile round trip to the home improvement store. I live in a rural area, so there are no short trips which can cause excessive water to build up in the exhaust system.

It wasn't cold outside; temperature was about 55 degrees when I got home.

If that water is coming out of the exhaust pipe in that position, so is exhaust gas, by my reckoning. However, I've never heard any sound that might be interpreted as an exhaust leak.

Anybody else see this behavior in their truck? Thoughts?
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post #2 of 12 (permalink) Old 03-19-2017, 08:34 PM
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Condensation I'd guess, probably just need to tighten the flange bolts


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post #3 of 12 (permalink) Old 03-19-2017, 08:50 PM
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I have an aftermarket BA muffler and mine leaks there.
Since you're still under warranty, let them fix it.

OR, this is the gasket that goes there.
Fel-Pro 60461 Exhaust Flange Gasket

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

OEM gasket is like $14......

Take it easy tightening that bolt.
I broke 1 tightening it too much..

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post #4 of 12 (permalink) Old 03-19-2017, 11:32 PM
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I have a BA muffler as well and have put in a couple new gaskets at that junction and they just burn up and leak again.

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post #5 of 12 (permalink) Old 03-19-2017, 11:40 PM
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I have the dreaded Flowmaster American Thunder Cat Back system that leaves puddles under the exhaust tips as well. The remainder of the system is pretty much 'water tight' at the joints in the pipe/muffler.
Just a thought here ~ I hope you don't have a coolant leak in the engine somewhere that's causing this. Have a good look at your radiator overflow receptacle to make sure the coolant level is constant. Otherwise, it's merely water ~ a byproduct of combustion in the engine.

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post #6 of 12 (permalink) Old 03-20-2017, 05:33 AM Thread Starter
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I hope you don't have a coolant leak in the engine somewhere that's causing this. Have a good look at your radiator overflow receptacle to make sure the coolant level is constant.
Yeah, that's my real concern.

The coolant level this morning was about 3/8 inch below the "Full" line on the reservoir. I used a sharpie to put a red dot at the coolant level on the coolant reservoir this morning before I headed out for my daily commute. I'll check it at lunch when the engine is cold again. At only 28K miles with this truck and most of that highway miles, any coolant loss is unacceptable.

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post #7 of 12 (permalink) Old 03-21-2017, 01:32 PM
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Originally Posted by IamRay View Post
Yeah, that's my real concern.

The coolant level this morning was about 3/8 inch below the "Full" line on the reservoir. I used a sharpie to put a red dot at the coolant level on the coolant reservoir this morning before I headed out for my daily commute. I'll check it at lunch when the engine is cold again. At only 28K miles with this truck and most of that highway miles, any coolant loss is unacceptable.
Mine is under the full line also. I just assumed it came that way. 2016 now has 4400 or so on it.


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post #8 of 12 (permalink) Old 03-21-2017, 09:41 PM
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if coolant was going down the exhaust pipe.wouldn't you think some smoke would emanate from said pipe when running?

op,are you sure it's not just water coming from the bed?
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post #9 of 12 (permalink) Old 03-21-2017, 10:43 PM
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By any chance was your truck pointed downhill?

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post #10 of 12 (permalink) Old 03-22-2017, 08:12 AM Thread Starter
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if coolant was going down the exhaust pipe.wouldn't you think some smoke would emanate from said pipe when running?

op,are you sure it's not just water coming from the bed?
Not coming from the bed. We have not had any rain/snow in a couple weeks, rest of truck was bone dry. As for visible steam coming from the pipe; I saw a little steam while driving on Saturday morning, but that seemed normal for a 40-degree morning. I've also had head gasket failures on previous vehicles that were only detected through watching the coolant level as no steam was visible coming from the pipe.

The vehicle was on level ground both times when I noticed the drip.

I've looked at the mark I put on the coolant reservoir before I left the house on Monday morning. No detectable drop in the coolant level to this point, and I've put about 150 miles on it since marking the reservoir. I also idled the truck yesterday during lunch time for about 20 minutes and detected no leak under the truck.

Guess I'll put it into "watch" status.
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post #11 of 12 (permalink) Old 05-13-2017, 05:03 PM
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I have a 2016 Crewmax with 20K miles on it and I noticed this drip as well from the same place. My truck was parked downhill on my driveway. I will check again tomorrow and park it on a level surface.

Current: 2016 Tundra Crewmax SR5 TRD Off Road 5.7L
Past: 2014 Tundra DoubleCab SR5 4.6L
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post #12 of 12 (permalink) Old 05-15-2017, 01:20 PM
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Tried it on a level surface, same result.

Is this something of concern, or should just go in watch status for now?

Current: 2016 Tundra Crewmax SR5 TRD Off Road 5.7L
Past: 2014 Tundra DoubleCab SR5 4.6L
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