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IDI Engine / Re: Disassembling veggie block w/ piston slap- rod length?
« Last post by fatmobile on March 22, 2023, 11:57:01 pm »Those marks on the pistons are due to a broken timing belt, it wasn't running with the pistons slapping the valves.
And this one was going down the road pretty fast when it broke.
Nice find, a hydraulic TD block.
That means you can use a metal head gasket from a 1.9 AAZ block.
Or it's pretty easy to put a mechanical head on it, with a regular head gasket.
Kinda hard to read the numbers but it looks like original pistons so a second over bore to 78mm might get rid of all the rust pits.
Or since it's a hydro block you could put 1.7 pistons into it which are 79.5mm.
I've seen an I-shaft thrust surface break off like that before.
I think it's from a bad injection pump mainshaft bearing, that made the belt ride to the outside.
Then it had to skip across the I-shaft pully to get back in line with the crank sprocket.
That pulls the shaft out, then the oil pump pulls it back to ride against the thrust surface in like normal.
Bang,bang,bang break.
What's in the head bolt holes?
I would think the rod measurement would be from hole to hole.
And this one was going down the road pretty fast when it broke.
Nice find, a hydraulic TD block.
That means you can use a metal head gasket from a 1.9 AAZ block.
Or it's pretty easy to put a mechanical head on it, with a regular head gasket.
Kinda hard to read the numbers but it looks like original pistons so a second over bore to 78mm might get rid of all the rust pits.
Or since it's a hydro block you could put 1.7 pistons into it which are 79.5mm.
I've seen an I-shaft thrust surface break off like that before.
I think it's from a bad injection pump mainshaft bearing, that made the belt ride to the outside.
Then it had to skip across the I-shaft pully to get back in line with the crank sprocket.
That pulls the shaft out, then the oil pump pulls it back to ride against the thrust surface in like normal.
Bang,bang,bang break.
What's in the head bolt holes?
I would think the rod measurement would be from hole to hole.