230 Engine tag

[amanco]

Any one have any input on the tag on a 230. Just curious what it all means. Depot rebuild? Thanks!

 

[Warthog]

Looks like a depot rebuild.

Cylinders are .020 oversized
Rods are .010 undersized
mains are .010 undersized

And it was rebuilt in May 1957

You milage may vary.

WartHog

(fixed wording on the rods from oversized to undersized)

 

[amanco]

That may explain the extra .020 in the cylinders. Looks like it was bored out but the original pistons were used, not oversize. My TM9-1840A says min piston to cylinder clearance is .0002", max is .0012". With out using a micrometer, the flat feeler gauge between the two shows every bit of .0021" And no top ridge to ream out so it was bored to this size.

 

[maxim]

Another variation.

 

[Warthog]

This shows that the engine was overhauled at LAD in Dec 1963,

The Bore is standard size
The rod and main bearings are .010" undersized