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  #1  
Old 04-12-2019, 08:36 PM
Jvon811's Avatar
Jvon811 Jvon811 is offline
 
Join Date: Mar 2014
Location: Fenton, MI
Posts: 67
Default Exhuast leaks at the slip joint?!

RV-4, O-320-E3D with mid 90's design Sky Dynamics Crossover exhaust...

The exhaust system has short stub pipes that bolt to the cylinder that's maybe 5-6" long and then slips into the next piece which starts the curve and crossover. I've started to get some blowback or leakage on the slip joint on the #2 Cylinder (Front Left). I can see discoloration on the #2 intake tube and plug wires along with the obvious staining on the pipe itself.


All bolts are tight holding the slip joints in compression but there is still a bit of wiggle where I can sometimes, but not always, rock the joint back and forth (maybe 2-3 degrees of movement) which I'm suspecting is the leak.


Anyone dealt with this before? Thanks in advance. I'll try and grab some pictures tomorrow if it will help.
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RV-4 N249P O-320, Warnke Prop, GRT Sport EX
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  #2  
Old 04-13-2019, 05:23 AM
n816kc n816kc is offline
 
Join Date: Jan 2005
Location: Winter Haven, FL
Posts: 223
Default Easy fix

Had a similar issue with my -6. I pulled the exhaust and made sure the slip over tubes were completely round (one was a little ovalled out).Then we used a tubing expander to lightly, very lightly, expand the stub tube from the cylinder. Tightened up the fit nicely. No issues in the 550 hours since.
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2019 =VAF= donor
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  #3  
Old 04-13-2019, 07:48 AM
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Jvon811 Jvon811 is offline
 
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Awesome! Thank you very much. I'll look into doing that
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-Justin

RV-4 N249P O-320, Warnke Prop, GRT Sport EX
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  #4  
Old 04-13-2019, 08:26 PM
Scott Hersha Scott Hersha is online now
 
Join Date: Jan 2005
Location: Cincinnati, OH
Posts: 1,018
Default

I use mouse milk on these joints every time I have the cowl off - which is relatively frequent. It helps these joints to remain healthy.
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RV6/2001 built/sold 2005
RV8 Fastback/2008 built/sold 2015
RV4/bought 2016/sold/2017
RV8/2018 built/Flying
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JAN2019
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  #5  
Old 04-14-2019, 04:53 PM
Boyd Birchler Boyd Birchler is offline
 
Join Date: Sep 2014
Location: IN
Posts: 177
Default

I'll 2nd the exhaust tube expander. Used it on turbo exhaust systems that leaked excessively. Be careful you can over do it easily;so do a little then check.
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  #6  
Old 04-14-2019, 07:57 PM
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Jvon811 Jvon811 is offline
 
Join Date: Mar 2014
Location: Fenton, MI
Posts: 67
Default

I did some gentle expanding yesterday and upon reassembly, it went together snugly. A lot better feeling than before. Thanks for the idea! I do use mouse milk on the ball joint in the exhaust but never thought to milk the slip joints.

Best of all, I got to purchase a new tool out of the deal!!

I'll know for sure if the leak is gone after the Conditional this week and I run it again.
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RV-4 N249P O-320, Warnke Prop, GRT Sport EX
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