Thread: Guessing Game Mk III : What Engineering Marvel is this.?

Originally Posted by Chops

I'm thinking that looks like a honing stone in the middle there, so I'm guessing it's to do with refurbishing journals.

Sorry Chops I didn't see your post until now.
yes its a in vehicle big end journal machining tool.
Much sort after by people who know about them.
Saves you from pulling out the motor to grind the crank to the next under size.
You fit the adjustable and temporary big end cap with the fine cutter to a conrod and adjust it up.
Turn over the engine starter with the sparkplugs out and the file takes off the high spots and if you adjust and turn over the motor enough down to the next undersize.

DSCN0352 by john smith, on Flickr
DSCN0353 by john smith, on Flickr
DSCN0355 by john smith, on Flickr
DSCN0357 by john smith, on Flickr

What normally happens with the above tool is its usually employed only to do one journal after a big end bearing failure so you buy Two big end bearing sets and on a four cylinder motor, fit 3 standard size and one 10 thou under size on the crook journal......now finished in good condition to under size.
So if you ever pull a part big end bearings and find them different sizes, this tool has been used.
Big versions are used on ships engines as the engine is usually fitted for the life of the ship and you just cannot pull out a crankshaft to machine it.

Ron when you get sick of that bulky old drill cluttering up your shed I would be prepared to get rid of it for you at minimal cost to yourself....

Originally Posted by POD

Ron when you get sick of that bulky old drill cluttering up your shed I would be prepared to get rid of it for you at minimal cost to yourself....

It is still earning its keep and will be staying here

Carry on someone,, I'm a bit tied up today with roadworthy stuff

Originally Posted by 101 Ron

What normally happens with the above tool is its usually employed only to do one journal after a big end bearing failure so you buy Two big end bearing sets and on a four cylinder motor, fit 3 standard size and one 10 thou under size on the crook journal......now finished in good condition to under size.
So if you ever pull a part big end bearings and find them different sizes, this tool has been used.
Big versions are used on ships engines as the engine is usually fitted for the life of the ship and you just cannot pull out a crankshaft to machine it.

Couldn't you do the main crank journals on some engines with this marvel too?

DL

Ron's posts have been very informative, well done to your granddad, Ron he was an impressive tool maker.

Now where is the next engineering marvel?

Mrs hh