RTH. Bore size on 2f (1 Viewer)

[ceylonfj40nut]

Folks,

Knee deep in getting a piston swapped. Caliper reading of all bores were 3.670” which seems stock.

Pistons in block have a 0.05 stamped on it. Pulling piston out now and will mic it and share. Anyone know if stamp on piston means 0.05 oversize?

@FJ40Jim?
@landcrusher909?
@3_puppies?

 

[1911]

Anyone know if stamp on piston means 0.05 oversize?

CD, that’s what it would mean on any (other) piston I’ve ever seen, but I have no 2F-specific piston experience.

 

[ceylonfj40nut]

Found the culprit

 

[1911]

That’ll do it - looks like a compression ring broke, and a little piece of it wouldn’t stay in the land, and tore up the piston.

 

[ceylonfj40nut]

pistons are repco 2648 on piston casting

 

[ceylonfj40nut]

Piston diameter is 3.665”…seems like it is standard bore

 

[Grayscale]

2F bore = 3.701 to 3.703

The motor was rebuilt.

 

[ceylonfj40nut]

Looking at repco piston designations…STD is standard bore. The 0.04 designation is accounting for head decking

 

[ceylonfj40nut]

All my pistons have STD designation

 

[ceylonfj40nut]

.

 

[Grayscale]

also