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MG TD TF 1500 - Hole in Exhaust Manifold

I sent my TD exhaust manifold to Jet Hot to be coated. They reported this hole and asked about it. I didn't know what to tell them. I don't believe it goes all the way through to the inside, Any thoughts or ideas would be appreciated.
Thanks, Tom

T Scileppi

That's normal for the later, larger Mark II/TF manifolds, and nothing about which to worry.

Tom Lange
MGT Repair
t lange

Thanks for that information Tom. My manifold is from a later TD, but not a Mark ll. TD XPAG 26248.
T Scileppi

Tom explain to me how the Mark II exhaust manifolds are larger? Is there a different on involved? I’ve never heard about the exhaust being different

Bill Chasser
TD/c-8151
W A Chasser

Tom explain to me how the Mark II exhaust manifolds are larger? I’ve never heard about the exhaust being different

Bill Chasser
TD/c-8151
W A Chasser

Here is a TF manifold...probably the same as a later MKII I'm guessing....notice how the center ports are not open in between

L E D LaVerne

Her's an early TD engine in a TF not a great picture but the manifold is not solid between the center ports

L E D LaVerne

I don't really have a good image that show it well

L E D LaVerne

Thanks Laverne! I learn something new everyday. I’ll have to look at all my manifolds now and see what I have. Tom can you expand on when the casting change occurred?

Bill Chasser
TD/c-8151
W A Chasser

I don't have a parts manual at hand so I can't tell you when the change was made, but all TFs and many Mark II cars had an exhaust manifold with larger ports. The difference can be told by ther part number cast into the back of the manifold: no number means it is an early manifold (TC period), a 5-digit number means it is a small manifold as used on most TDs, and a 6-digit number means it is a late, larger manifold.

It's not a lot different, but when racing or doing performance work every mm means an advantage!

Tom Lange
MGT Repair
t lange

In my original post I switched things up. That manifold shown is a smaller manifold. Sorry for the confusion!

My parts manual shows that the change was made at engine XPAG 17029 for the Mark II or TD/C, when the manifold was changed from p/n SA2409 to SA2439/1. All later Mark II cars and TFs had the exhaust manifold with larger ports.

The difference can be told by the part number cast into the back of the manifold: no number means it is an early manifold (TC period), a 5-digit number means it is a small manifold as used on most TDs (as above), and a 6-digit number starting with "1" means it is a late, larger manifold.

It's not a lot different, but when racing or doing performance work every mm means an advantage!

Tom Lange
MGT Repair
t lange

Once again Tom, thanks for the information. I always enjoy learning something new... at least new to me.

Bill Chasser
TD/c-8151
W A Chasser

Tom so where does PN 24060 come into play?? See OP

Bill Chasser
TD/c-8151
W A Chasser

That's not a part number - it's the casting number on the inside of the regular (smaller) manifold; the larger manifold has the casting number 168432.

Tom Lange
MGT Repair
t lange

Tom. Okay again thanks.

Bill Chasser
TD/c-8151
W A Chasser

This thread was discussed between 07/03/2018 and 08/03/2018

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