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I can't help you with your specific question as I've never had the pistons out of any of my trucks. But I think maybe we have some differences in how we refer to the engines in our trucks. I wouldn't refer to my 2000 + 2 powerstroke as a mechanical diesel. I would however refer to my 89' IDI as being mechanical.
So to satisfy my own curiosity, and maybe help you, help others, better help you. Could you post a picture of the engine? Or maybe even just tell us if the upper radiator hose connects to the radiator on the passenger or drivers side? Is the fuel filter a spin on style located on the passenger side of the truck, or is it cartridge style dead center of the valley? This all assumes it was stock before you took it apart.
When you say 2000 with mechanical motor I'm envisioning a superduty with an engine swap to an older idi. Obviously, you would know your truck better than I would. But stranger things have happened on TV.
I never heard of a second ring gap that large? Some of the suppliers have charts with the correct ring gaps. If I was doing one and didn't look, I'd set them at .018 . There is a formula but it slips my mine right now.
OK...I've read enough...I gots to know...how does one set ring gap? I know how to spin them so they don't have all the gaps lined up if there's not a pin in there to set their alignment but I thought that they came specific sizes for specific cylinder diameters.
In a nutshell, you place the ring squarely in the cylinder bore and measure it with feeler gauges. If the gap is too small, a piston ring filer is used to adjust the it.
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