Did they say why a 1HZ block cant be machined?
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Akella has a used block in good shape
crack in the block? that would be a first for me to see.
why can't the block be milled?
the head should have been milled if out of square, cheaper and easier while off the first time.
thicker head gasker will reduce compression
explain to me again why a crack 'way down low' resulted in poor compression or over heating?
now, machining the block can reduce the compression travel area causing interferrence between valves and pistons.
we experienced this on Todd's second engine rebuild.
the machine shop shaved the block to make it true, put in the new liners to factory specs and never bothered to inform both the machine shop and myself.
reassembled the engine and something just didn't sound right. days of trying this and that before pulling the brand new head to find all 4 exhaust valved had been kissing the pistons.
so, that is why you can't machine the top of the block.
does this help?
well, till this happened to Todds second engine i did not know the caution. the clearence is very minor so machining can be only really, really minimal.
we all learn. i had gassers milled in the past, hence the question when i asked it.
the coolant passage isn't that far down and you mention deep down crack, hence that question.
i can see my participation is an irritation to you, i will no longer comment on your thread.
bye
I was told it is by design, and has do with with the fact that the pistons travel higher than the block surface. Which makes no sense to me, why would that matter? Two machinists and I think ENS told us that.
Ok ,maybe this is common on interference engines in general.
Im surprised a block could actually warp that much.The 1HZ block is a hefty lumpy of iron
The crack (note the weird pitting in the piston):
The crack (note the weird pitting in the piston):
How the heck did that happen?
Here's an idea. Maybe there was enough electrolysis from the coolant to eat the water jacket in that area, causing the metal to be thinner, which allowed the bore to crack to the jacket? Or is that portion of the cylinder bore open to the crankcase?
Only other time I've seen a diesel engine split like that is when this guy, ambulancechaser, built his 4BT as far as you can, no budget type of thing. At 80psi, the block split in half, looking like that inside the bore.
EDIT:
That new 1HZ block sure is pretty
The phenomenon you mention is actually from cavitation rather than electrolysis. Many diesels requires SCAs (supplemental coolant additives) be added to the coolant to avoid local "pinpoint" boiling or cavitation erosion--especially in designs that have wet liners rather than a regular design. The Ford Powerstroke comes to mind. Anyway, SCAs can vastly reduce the cavitation erosion which leads to premature failure.How the heck did that happen?
Here's an idea. Maybe there was enough electrolysis from the coolant to eat the water jacket in that area, causing the metal to be thinner, which allowed the bore to crack to the jacket? Or is that portion of the cylinder bore open to the crankcase?
Only other time I've seen a diesel engine split like that is when this guy, ambulancechaser, built his 4BT as far as you can, no budget type of thing. At 80psi, the block split in half, looking like that inside the bore.
EDIT:
That new 1HZ block sure is pretty
This truck will be for sale soon. I'm done.