JDMopar
Well-Known Member
I bought Cometic's for my 273 a few years ago. I'd have to dig out receipts to look, but I am 99% sure they were 4.040 x .028. The gasket set in the picture above looks like McCord gaskets I used to use back in the day.
/// Another Bunch Of 273 Commando Rebuild Questions? ///
- Thread starter Bossanova5
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i'd probably use those head gaskets if they weren't all aged/out or dry rotted. throw out the manifold gaskets tho, that stuff is probably trash.
if i weren't gonna go with those, i'd just bite the bullet and order up cometics.
if i weren't gonna go with those, i'd just bite the bullet and order up cometics.
Bossanova5
Well-Known Member
What about Mr Gasket's 1121G's?
i know that some folks have had issues with them leaking and the coating that them come with is often damaged when taken out of the packaging (think frosting on a cupcake).
whether that was a surface issue or a prep issue or what, i don't know. but i wouldn't run them if they were compromised in any way out of the package and if the heads and deck weren't machined perfect.
I used them on my 273 build and they worked great. That was 14 years ago. Hard to believe.
Bossanova5
Well-Known Member
The tear down continues....
One of the cam bearings worn through to the block. Fortunately, it doesn't look like in wore away at the block.
Cam bearing surface looks okay with no visible damage.
What would cause one cam bearing to wear through like this?
I measured the old head gasket; it came out to be .0327" at the compressed fire ring area and .0391" at the non-compressed area.
The original timing chain had almost an inch of deflection
Thanks for the continued comments
One of the cam bearings worn through to the block. Fortunately, it doesn't look like in wore away at the block.
Cam bearing surface looks okay with no visible damage.
What would cause one cam bearing to wear through like this?
I measured the old head gasket; it came out to be .0327" at the compressed fire ring area and .0391" at the non-compressed area.
The original timing chain had almost an inch of deflection
Thanks for the continued comments
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That's not the Block but rather the Inside of the Bearing Shell... They have a Protective Coating on them.
Bossanova5
Well-Known Member
What causes this king of wear?
Infrequent Oil Change Practices, Normal Wear, High-Speed Harmonics?
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Could the bore alignment cause a cam bearing to wear on one side more than the other?
Also lack of oil changes that allow recirculasion of nasty combustion byproducts. Also possible is a slightly bent camshaft.
furrystump
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The Babbitt has delaminated from the bearing shell. Common issue with older engine with some miles on it. Take a picture of the cam journal for that bearing.
Bossanova5
Well-Known Member
Need some help identifying rod and crank bearing sizes.
The first picture is the rod bearing.
I believe it was manufactured in 1977, obviously been replaced sometime in the past.
ID on the bearing - T 11 6 Clevite 77
What is the bearing size?
The second picture is the crank bearing.
Still in pretty good shape.
ID on the bearing - TC 10 6
What is the bearing size?
Where is the best place to buy new bearings?
I'm going to order a 220-grit ball hone to deglaze the cylinders for new OEM rings.
Will a 220-grit work or should I get a 180-grit hone?
I have been cleaning up the crank journals with 400/600/1000 grit sandpaper.
They are cleaning up pretty good.
Thanks for the help
The first picture is the rod bearing.
I believe it was manufactured in 1977, obviously been replaced sometime in the past.
ID on the bearing - T 11 6 Clevite 77
What is the bearing size?
The second picture is the crank bearing.
Still in pretty good shape.
ID on the bearing - TC 10 6
What is the bearing size?
Where is the best place to buy new bearings?
I'm going to order a 220-grit ball hone to deglaze the cylinders for new OEM rings.
Will a 220-grit work or should I get a 180-grit hone?
I have been cleaning up the crank journals with 400/600/1000 grit sandpaper.
They are cleaning up pretty good.
Thanks for the help
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