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Topic author
varmint
- Posts: 940
- Joined: Mon Jan 07, 2019 2:02 pm
- First Name: Vernon
- Last Name: Worley
- * REQUIRED* Type and Year of Model Ts owned: October 26, 1926 Coupe
- Location: New Orleans, LA
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Post
by varmint » Tue Oct 28, 2025 6:34 am
In the process of dealing with the freeze plug, I noticed that the hold down was contacting the side of the new exhaust manifold. I considered grinding away part of the cast iron to fix the problem and then realized that the witness mark was only a symptom of the real problem. When I screwed the hold down and contacted the intake manifold, there was still a dime space before it even contacted the boss area of the exhaust. When I flip the manifold clamp around 180º, same problem. The boss area is lacking in boss. I did not have this problem with the original exhaust manifold.
Instead of torching, preheating, and adding weld material to the replacement part's boss, I elected to add it to the manifold clamp.
Vern (Vieux Carre)
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Allan
- Posts: 6946
- 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
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by Allan » Tue Oct 28, 2025 7:14 am
Vern, check that the stud over which the clamp fits is not bent. That will miss align the clamp ends on the bosses and leave one end of the boss at a different level. The fact that it was registering on the side of the exhaust manifold makes me think the stud is displaced to one side. If you have any spare clamps, I would replace the one you photographed.
Allan from down under.
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Topic author
varmint
- Posts: 940
- Joined: Mon Jan 07, 2019 2:02 pm
- First Name: Vernon
- Last Name: Worley
- * REQUIRED* Type and Year of Model Ts owned: October 26, 1926 Coupe
- Location: New Orleans, LA
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Contact:
Post
by varmint » Tue Oct 28, 2025 7:36 am
I do not have any spare clamps but i do see that they are available.
I tried a different clamp but same gap issue.
The stud is new and straight. The new stud did not have a problem with the old manifold.
Good statements though.
Vern
Vern (Vieux Carre)
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Adam
- Posts: 1591
- 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
- Board Member Since: 2000
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by Adam » Tue Oct 28, 2025 8:58 am
Vern is correct in the fact that the manifold isn’t cast exactly right. The new manifolds have been that way for at least fifteen years. I’ve installed several of them and they require some grinding to the front outside of the rear manifold port to get the clamp to fit properly AND some fitting to get the hot air pipe to fit well.
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Mark Nunn
- Posts: 1270
- Joined: Mon Jan 07, 2019 8:01 am
- First Name: Mark
- Last Name: Nunn
- * REQUIRED* Type and Year of Model Ts owned: 1926 Runabout
- Location: Bennington, NE
- Board Member Since: 2017
Post
by Mark Nunn » Tue Oct 28, 2025 9:09 am
The new manifold that I bought 2 years ago has the boss and fit perfectly with no modifications.
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John kuehn
- Posts: 4538
- Joined: Sun Jan 06, 2019 8:00 pm
- First Name: John
- Last Name: Kuehn
- * REQUIRED* Type and Year of Model Ts owned: 19 Roadster, 21 Touring, 24 Coupe
- Location: Texas
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by John kuehn » Tue Oct 28, 2025 9:21 am
I bought a new exhaust manifold a few years ago for my 21 Touring and it worked OK.
Here’s an earlier post about manifold clamps.
http://www.mtfca.com/discus/messages/59 ... 1473037627
