Exhaust leak at nut

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Topic author
jonathan
Posts: 38
Joined: Mon Jan 14, 2019 2:51 pm
First Name: jonathan
Last Name: Delancey
* REQUIRED* Type and Year of Model Ts owned: 1919 Roadster
Location: Easton PA

Exhaust leak at nut

Post by jonathan » Sun Aug 23, 2020 4:12 pm

Noticed today that exhaust is coming out from under the nut ( between the pipe and nut ) that connects the manifold to the pipe. The nut is tight. What can I do?


Adam
Posts: 1411
Joined: Sun Jan 06, 2019 11:57 am
First Name: Adam
Last Name: Doleshal
* REQUIRED* Type and Year of Model Ts owned: ‘13 Touring, ‘24 Touring, ‘25 TT dump truck, ‘26 Tudor, ‘20 Theiman harvester T powerplant, ‘20 T Staude tractor
Location: Wisconsin
MTFCA Number: 23809
MTFCI Number: 1
Board Member Since: 2000

Re: Exhaust leak at nut

Post by Adam » Sun Aug 23, 2020 4:37 pm

There are some repro brass nuts that have been available off and on over the years that aren’t quite machined just right. The threads and/or clearance inside isn’t quite deep enough and the pipe flange doesn’t get tight against the manifold.

If this is the case, you need a better quality exhaust nut.


Topic author
jonathan
Posts: 38
Joined: Mon Jan 14, 2019 2:51 pm
First Name: jonathan
Last Name: Delancey
* REQUIRED* Type and Year of Model Ts owned: 1919 Roadster
Location: Easton PA

Re: Exhaust leak at nut

Post by jonathan » Sun Aug 23, 2020 5:15 pm

It turns out the flare at the end of the pipe was broken off! Ordered a new pipe from Lang’s.


Allan
Posts: 5201
Joined: Sun Jan 06, 2019 7:21 pm
First Name: Allan
Last Name: Bennett
* REQUIRED* Type and Year of Model Ts owned: 1912 van, 1917 shooting brake, 1929 roadster buckboard, 1924 tourer, 1925 barn find buckboard, 1925 D &F wide body roadster, 1927LHD Tudor sedan.
Location: Gawler, Australia

Re: Exhaust leak at nut

Post by Allan » Sun Aug 23, 2020 9:08 pm

Jonathan, that sometimes happens when the flange does not contact the manifold correctly, and the nut is done up tightly to close the gap. This puts stress on both the pipe flange and the manifold. The flange needs to sit neatly on the manifold before the nut is done up.

Allan from down under


Robert Kiefaber
Posts: 56
Joined: Tue Mar 05, 2019 3:38 pm
First Name: Bob
Last Name: Kiefaber
* REQUIRED* Type and Year of Model Ts owned: 1906 model F, 1907 model R, 1915 centerdoor sedan, 1921 centerdoor sedan
Location: Indiana

Re: Exhaust leak at nut

Post by Robert Kiefaber » Mon Aug 24, 2020 2:07 am

I use 0000 steel wool as packing inside nut. Seals very well.

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