Canadian 218

[Pursy]

I have a Canadian 218 in my recently purchased Fargo. Have done a few jobs on it and did a 50 mile round trip in it last weekend. Noticed a bit of blow by so did a leak down test which revealed poor ring seal

Got the pistons out and the bores looked good but it seems I have 3.375" pistons and rings on 3.795" bores. New plus 0.020"pistons are quite expensive and wondered if it would be cheaper to sleeve down to 3.25" or go bigger. It would mean a lot of work but i am open to your comments. Thanks

 

Pursy

 

[JBNeal]

What does your local machine shop think of your approach?

[9 foot box]

   Pursy, you have typed some wrong numbers on your measurements. You have a 3.375” piston in a 3.795” bore? 

[Pursy]

Oops 3.395"

[9 foot box]

    I believe that a 3.375” bore with a 4.250” stroke, would make your engine a 228 c.i. I would do what keithb7 did, and use new 3.4375” pistons, and make your engine a 237 c.i. What is the engine number stamped on the block, above the generator? Can you measure the stroke of the piston travel?  Google t137 other engines. That has some information on Canadian and U.S. versions of engines. Rick D.

[John-T-53]

Either way you will have to hone the cylinders to get the pistons to fit just right (about 0.002" clearance). If the bores are already .020" over you might have to home to .040" as cylinder wear is not usually uniform. You don't sleeve a motor unless it's a last resort.

You need new pistons and probably a full rebuild if you're in that deep. Bearings, bushings, valves, crank grind, etc. 

The size you hone the cylinders up to is usually determined after the block is pulled and each cylinder carefully measured. Then you will know what size they will be after machining.

Edited November 7, 2022 by John-T-53