I'm building my engine at the moment and since I have to replace my crankshaft due to it being cracked and I can't find an 86mm one over here I decided to go for an 88mm XUD9 crank and custom 86,5mm pistons.

This morning I went to the machine shop and dummy built the engine in order to determine what the piston speck should be. With the std crank the pistons came 1mm below deck at TDC.

Then when putting the diesel crank in the pistons came up to deck so I was thinking of making the compression height 1mm lower to compensate.

Is this correct for the std XU10J4RS? Do pistons sit below deck with the std crank?

Thanks for your responses

Pistons are RFS, they have very small valve cutouts but still they sit something like 0,7mm below deck.

I fear the engine might have been repaired before and been assembled with other rods than standard. Are there any rods that might be slightly smaller in lenght thus making te pistons sit lower?

Cranks unfortunately are very hard to source here in Argentina and I would like to retain an eith counterweight one, also it makes for a nice upgrade!

152 and 158, RFS comes flush to deck with a dish, RFY are flat top and come below deck by about 0.7mm.

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