Can my block be saved? :(
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What Ryan means is that there isn't alot of room in the head-bolt holes and any expansion of the block could cause cracking as the oil can't be compressed.
It's important to clean the head-bolt threads and blow it all out with an airline, but it's a bit late for that now!!
It's important to clean the head-bolt threads and blow it all out with an airline, but it's a bit late for that now!!
My rs500 block cracked from the bolt hole to the water jacket either side. The engine shop had a 200 block in that had cracked from the top water jacket all the wat through every bolt hole and every water jacket. crack was the full lenght of the block.
I hope mine doesnt turn out to be like this. I have just bought it, and its recently had the head off for oil steals. Now its using water and there is an oily film in the expansion bottle.
The lad I got it off is adamant the bolt holes were clean and dry when re fitting.
We'll see this weekend no doubt when I whip the head off.
The lad I got it off is adamant the bolt holes were clean and dry when re fitting.
We'll see this weekend no doubt when I whip the head off.
our saturday boy brought his first 4x4 cozzie cheap as the engine was out and had cracks worse than this around the second from center holes..
he did not have lots of cash to purchase a new block so i had his block long studded and welded and re faced..
its going strong at around 400 bhp with no problems ..as the long studs fasten from around the oil gally level and put no force on the cracked areas .....
its your choice but all is not lost......
he did not have lots of cash to purchase a new block so i had his block long studded and welded and re faced..
its going strong at around 400 bhp with no problems ..as the long studs fasten from around the oil gally level and put no force on the cracked areas .....
its your choice but all is not lost......
Too many posts.. I need a life!!
Joined: May 2004
Posts: 925
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From: in the garage fixing yet another oil leak
cant see why long studding wont fix it.
the cracks look like they run to the water jackets each side of the bolt hole and NOT to the bores. when the block is long studded some of the studs can be seen when looking down through those water jacket holes that the crack goes to. this means that the drill goes through the block face then through 'thin air' (where water circulates) until it reaches the bottom of the block where the threaded part is created for the stud to locate into.
the balance of the long stud holes actually need to be drilled right through the block as its solid in those parts. when the long studs that go through thin air are torqued into the bottom of the block (50lb ft from memory) this has the effect of pulling the deck down towards the stud thread and actually distorts the block face in the process (mountune says this is normal and when you torque the head up it sorts it out) but when you torque up those studs that go through solid material this is not apparent. the torquing of the studs into the block according to Mountune is to return some rigidity to the block which was removed when the stud holes were drilled.
clearly, if the hole that has the crack is one which has thin air below it, torquing it up when installing the studs will likeley stress that area even more but if its a solid one then there is less likleyhood. In any event when i put my engine together long studded i didnt like the distortion of the head face and so fitted the long studs with loctite and didnt torque them up (no chance of them coming loose anyway as they appear to be interference fit in the holes in the block) and the engine is in bits now with no problems due to studs.
the cracks look like they run to the water jackets each side of the bolt hole and NOT to the bores. when the block is long studded some of the studs can be seen when looking down through those water jacket holes that the crack goes to. this means that the drill goes through the block face then through 'thin air' (where water circulates) until it reaches the bottom of the block where the threaded part is created for the stud to locate into.
the balance of the long stud holes actually need to be drilled right through the block as its solid in those parts. when the long studs that go through thin air are torqued into the bottom of the block (50lb ft from memory) this has the effect of pulling the deck down towards the stud thread and actually distorts the block face in the process (mountune says this is normal and when you torque the head up it sorts it out) but when you torque up those studs that go through solid material this is not apparent. the torquing of the studs into the block according to Mountune is to return some rigidity to the block which was removed when the stud holes were drilled.
clearly, if the hole that has the crack is one which has thin air below it, torquing it up when installing the studs will likeley stress that area even more but if its a solid one then there is less likleyhood. In any event when i put my engine together long studded i didnt like the distortion of the head face and so fitted the long studs with loctite and didnt torque them up (no chance of them coming loose anyway as they appear to be interference fit in the holes in the block) and the engine is in bits now with no problems due to studs.
How did you know it was cracked????
I hope mine is ok, as i think it's maybe using some water (although the radiator is leaking) I couldn't help notice a more than usual quantity of water coming out the exhaust, hope it's just my imagination..
So how long would it have to be run to expand that much and crack?????
I hope mine is ok, as i think it's maybe using some water (although the radiator is leaking) I couldn't help notice a more than usual quantity of water coming out the exhaust, hope it's just my imagination..
So how long would it have to be run to expand that much and crack?????
if that my old 200 wire-rung block if so it wasn't sold in that condition i even have some pictures of the block face to prove it was mint when i built it and sold it on! after only covering 1500 miles!
Am i right in thinking that the guy ya bought it off said he never even used the bottom-end?
Am i right in thinking that the guy ya bought it off said he never even used the bottom-end?
the 1 saving grace is that the crank, rods and brand new pistons in that block where mint, i even purchased a mint used standard size crank for that engine
But i'm sure you told me you had some issues with the engine knocking?
like i said all the guy told me was that the block was going in a escos that he used on the track and that it was gonna be over 400bhp
But i'm sure you told me you had some issues with the engine knocking?
like i said all the guy told me was that the block was going in a escos that he used on the track and that it was gonna be over 400bhp
How did you know it was cracked????
I hope mine is ok, as i think it's maybe using some water (although the radiator is leaking) I couldn't help notice a more than usual quantity of water coming out the exhaust, hope it's just my imagination..
So how long would it have to be run to expand that much and crack?????
I hope mine is ok, as i think it's maybe using some water (although the radiator is leaking) I couldn't help notice a more than usual quantity of water coming out the exhaust, hope it's just my imagination..
So how long would it have to be run to expand that much and crack?????
if the rad drops its guts an spits it all out..when your driving the car ..
you know what happens
cant see why long studding wont fix it.
the cracks look like they run to the water jackets each side of the bolt hole and NOT to the bores. when the block is long studded some of the studs can be seen when looking down through those water jacket holes that the crack goes to. this means that the drill goes through the block face then through 'thin air' (where water circulates) until it reaches the bottom of the block where the threaded part is created for the stud to locate into.
the balance of the long stud holes actually need to be drilled right through the block as its solid in those parts. when the long studs that go through thin air are torqued into the bottom of the block (50lb ft from memory) this has the effect of pulling the deck down towards the stud thread and actually distorts the block face in the process (mountune says this is normal and when you torque the head up it sorts it out) but when you torque up those studs that go through solid material this is not apparent. the torquing of the studs into the block according to Mountune is to return some rigidity to the block which was removed when the stud holes were drilled.
clearly, if the hole that has the crack is one which has thin air below it, torquing it up when installing the studs will likeley stress that area even more but if its a solid one then there is less likleyhood. In any event when i put my engine together long studded i didnt like the distortion of the head face and so fitted the long studs with loctite and didnt torque them up (no chance of them coming loose anyway as they appear to be interference fit in the holes in the block) and the engine is in bits now with no problems due to studs.
the cracks look like they run to the water jackets each side of the bolt hole and NOT to the bores. when the block is long studded some of the studs can be seen when looking down through those water jacket holes that the crack goes to. this means that the drill goes through the block face then through 'thin air' (where water circulates) until it reaches the bottom of the block where the threaded part is created for the stud to locate into.
the balance of the long stud holes actually need to be drilled right through the block as its solid in those parts. when the long studs that go through thin air are torqued into the bottom of the block (50lb ft from memory) this has the effect of pulling the deck down towards the stud thread and actually distorts the block face in the process (mountune says this is normal and when you torque the head up it sorts it out) but when you torque up those studs that go through solid material this is not apparent. the torquing of the studs into the block according to Mountune is to return some rigidity to the block which was removed when the stud holes were drilled.
clearly, if the hole that has the crack is one which has thin air below it, torquing it up when installing the studs will likeley stress that area even more but if its a solid one then there is less likleyhood. In any event when i put my engine together long studded i didnt like the distortion of the head face and so fitted the long studs with loctite and didnt torque them up (no chance of them coming loose anyway as they appear to be interference fit in the holes in the block) and the engine is in bits now with no problems due to studs.
Steve
firstly yes the guy i bought from said he never used it at all.
unfortunately there is no "saving grace" with the crank. it needed re-ground. centre bearing was scored and the shell. its currently with harvey getting gorund to match new shells and taking even more of my money!!!!
oh well it'll make a good door stop
firstly yes the guy i bought from said he never used it at all.
unfortunately there is no "saving grace" with the crank. it needed re-ground. centre bearing was scored and the shell. its currently with harvey getting gorund to match new shells and taking even more of my money!!!!
oh well it'll make a good door stop
unfortunately there is no "saving grace" with the crank. it needed re-ground. centre bearing was scored and the shell. its currently with harvey getting gorund to match new shells and taking even more of my money!!!!
oh well it'll make a good door stop

fuk me can't believe that well like i said before i reckon the guy must have fitted that bottom-end in his track car, ragged it around for a yr or so then sold it to you saying he'd never even used it

I was lucky at the time cause i bought the crank off Tim Finch then my machine shop checked it and said it was like new, not 1 mark on it he simply gave it a quick polish and made sure the new bearing where the correct fitment
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