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TR6 Casting plugs aka freeze plug size TR6

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TR6oldtimer

TR6oldtimer

Darth Vader
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My eyes are not as good as the once were, so does anyone know the size of the casting plug size on the exhaust side of the engine? I measured 1.5 inches. Also the size of the plug for the rear cam journal, which I have at 2"?

Also, a list of plugs and sizes would also be helpful.

Thanks
 
Brosky

Brosky

Great Pumpkin
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Ray, I've got those numbers/sizes somewhere. Just let me find it.
 
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TR6oldtimer

TR6oldtimer

Darth Vader
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Thanks Paul.

My original post referenced a TR6, when in actuality it is a TR250 engine, not that it matters. Anyway, I once again checked what I have, and the five plugs on the side and back, are actually 1.5", not the 1.375" as indicated in the reference. All the others are as specified.
 
Brosky

Brosky

Great Pumpkin
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That's odd. I bought the 1.5" for mine, per the Dorman catalog and had to return them and get the 1.375" to fit. And I didn't fit them, the machine shop did. Maybe the earlier castings were bigger?
 
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TR6oldtimer

TR6oldtimer

Darth Vader
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Strange indeed, 1.5 is what they were.

P7190006.jpg
 
Brosky

Brosky

Great Pumpkin
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Very strange indeed, but after your piston story, maybe not so strange after all.

Dorman 565-025 Cup Type Expansion Plugs

Dorman 565-025 Cup Type Expansion Plugs Features:
• Nominal Dia.: 1-3/8"
• Metric Dia.: 35.24mm
• Type: Brass
• Height: 0.310"
• Closed End Dia.: 1.382"
• Open End Dia.: 1.392"
• Brand: Dorman - AutoGrade - Boxed
Details and Features
* Oversize: No

Here's a picture of what I took to the shop after the exchange:
 

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