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Old 10-22-2010, 02:04 PM   #1
Turbovan
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Default Sleeving a cracked cylinder?

I haven't been able to find much info on this subject, but what are the necisary precautions when sleeving a block with a cylinder that cracked? Should\can the block be welded? Is there a possibility of the block still being trash after being welded, and are there any tests the machine shop can do to check as to how severe/extensive the crack actually is?
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Old 10-22-2010, 02:55 PM   #2
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As far as I know once the cylinder is cracked(compromised)it is not sleevable because the block has to have all its strength because the sleeves go in with a .003-.004 press fit.
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Old 10-22-2010, 04:27 PM   #3
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Agreed^^^^ Plus its cheaper to just buy a different case.
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Old 10-22-2010, 05:40 PM   #4
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Quote:
Originally Posted by Sinister redlines View Post
Agreed^^^^ Plus its cheaper to just buy a different case.
Not if my plan is to sleeve anyways.

Now I can understand the crack being an issue if it extends too far towards the crank, but what if it appears to be isolated near the top of the bore? Since most of the stock sleeve is removed entirely anyways, how can one know for sure if the remainder has been compromised? Can a sonic test provide the necessary information? I have seen a few posts(three maybe) that state the block should simply be welded first, but no further information or apparent validation of this method.
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Old 10-22-2010, 07:34 PM   #5
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I would recommend calling darton and asking them. If they tell you it's no good, then I have a good bare case I'll sell you. I'll even ship it directly to darton for you if they're doing your sleeves.
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Old 10-22-2010, 10:35 PM   #6
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When they machine the block for the sleeves they do not remove all the aluminum around the factory sleeve and the darton sleeve has to have a strong shelf to sit on at the top in the middle and at the bottom and if the cases are compromised in any of these areas the sleeve will not have the support to stay in place and will move around and drop.Like posted above you are better off buying a used block for 3 to 4 hundred and have it sleeved instead of using a block thats questionable.If you are trying to do a sleeved block by trying to save money by reusing your cracked block---FORGET IT.
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Old 10-23-2010, 03:31 PM   #7
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Definately, why short yourself in a big build where the integraty could be compromised vs buy wrx_driver_2002's block and have a strong base platform with no questions. Trust me I just went through a major loss on a build because I substandard a builder vs paying a bit extra and having no problems. BTW I know it was mentioned before but make sure to have the main line checked after sleeves as it was found as a contributer to my builds failure. My mainlines where supposed to be checked but the builder failed to do so and missed my mains all being way out after sleeves where installed.
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Old 10-23-2010, 03:45 PM   #8
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^^^yes The Mains Have To Be Checked After Sleeving And Most Of The Time Have To Be Lined Honed To Make True Again.
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Old 10-25-2010, 10:20 PM   #9
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Call element tuning. They will tell you why you shouldn't sleeve your engine.
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Old 10-26-2010, 09:47 PM   #10
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Originally Posted by sackytar View Post
Call element tuning. They will tell you why you shouldn't sleeve your engine.
And yet many others say its fine as long as its done correctly.
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Old 10-26-2010, 11:08 PM   #11
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I have a customers engine being sleeved as we speak. This isn't something to have your local shmo machine shop do. I send my stuff right to Darton. Pay the money and get it done right
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Old 10-26-2010, 11:35 PM   #12
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Exactly, Darton direct the only way for sure...
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Old 10-27-2010, 12:11 AM   #13
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I will give you the exact measurement tomorrow, but if the crack is at the very top you can sleeve it. The top 1/2-3/4" section of the Darton sleeve requires cutting out the complete original sleeve. If the crack is at the top and only goes down a little bit it will be cut out anyway. You just have to make sure the crack doesn't keep going the way down. Also if the crack is only in the inner liner and doesnt reach the outside of the OEM sleeve you can also still sleeve it since it will be machined away.

Jr
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Old 10-27-2010, 03:15 AM   #14
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I will try to get pictures and or measurements here in a couple days. Darton has asked for pictures as well before they can answer so I guess they will be able to tell me what I need. After much more research I have seen how critical the stock liner is(at least for darton/dry sleeves), and how it could crack fairly easily from a sleeve being pressed in.
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Old 10-27-2010, 02:34 PM   #15
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1/2" is number. Just measured them on a block we are installing sleeves on


Jr
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Old 10-30-2010, 05:39 AM   #16
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I cracked my block back in 2005, had it welded up, sleeved, pressure tested and after a few rebuilds for various different reasons and about 70,000km later its still as strong as ever. All the welding and sleeving was done by PMS in Qld Australia.

If its done right you wont have any future problems with it, i speak with first hand experience!
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Old 04-30-2012, 06:43 PM   #17
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Quote:
Originally Posted by Junior2JZ View Post
I will give you the exact measurement tomorrow, but if the crack is at the very top you can sleeve it. The top 1/2-3/4" section of the Darton sleeve requires cutting out the complete original sleeve. If the crack is at the top and only goes down a little bit it will be cut out anyway. You just have to make sure the crack doesn't keep going the way down. Also if the crack is only in the inner liner and doesnt reach the outside of the OEM sleeve you can also still sleeve it since it will be machined away.

Jr
Hrm. Need pics of how mine cracked.
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Old 04-30-2012, 10:21 PM   #18
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Quote:
Originally Posted by sackytar View Post
Call element tuning. They will tell you why you shouldn't sleeve your engine.
They also say to only do oversized valves...Headgames says you get more from porting instead of valving if doing one or the other as you'll get better gains.



Quote:
Originally Posted by sidewayz View Post
I have a customers engine being sleeved as we speak. This isn't something to have your local shmo machine shop do. I send my stuff right to Darton. Pay the money and get it done right
Which Darton, East or West?
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