Drilling a cylinder block for a helicoil...
03-10-2011, 01:47 PM
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Drilling a cylinder block for a helicoil...
The old man has stripped the threads from his perkins P3 diesel engine's block while doing the head gasket on his old MF40 digger, and wants to fit a helicoil.
He owns a magnetic drill (type used to drill RSJ's and such like), has bought the exact helicoil kit but cannot find an 11.5mm drill bit for this type of drill and he is (rightly so) loathed to try a hand drill, or fix the pillar drill to the block in some way.
I promised to look, but cannot find anyone who sells the bits in 11.5mm.
He bought an adaptor to use normal bits, but there isn't room under the chuck.
Any/all advise welcome!?
Tom
He owns a magnetic drill (type used to drill RSJ's and such like), has bought the exact helicoil kit but cannot find an 11.5mm drill bit for this type of drill and he is (rightly so) loathed to try a hand drill, or fix the pillar drill to the block in some way.
I promised to look, but cannot find anyone who sells the bits in 11.5mm.
He bought an adaptor to use normal bits, but there isn't room under the chuck.
Any/all advise welcome!?
Tom
03-10-2011, 03:10 PM
#2
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What type of drills it the drill originally holds is it shank drills Or collets
Maybe he could drill out as close to 11.5 as he has then finish it off by with a normal drill using the 11.5
Maybe he could drill out as close to 11.5 as he has then finish it off by with a normal drill using the 11.5
03-10-2011, 03:29 PM
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You should be able to buy an 11mm drill bit , that will be close enough as you need to tap it anyways , just take your time when tapping and it will be fine .
I had the same problem with a helicoil for a sump
I had the same problem with a helicoil for a sump
03-10-2011, 03:33 PM
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This type http://www.toolstation.com/shop/Clea...ies/d50/sd2675
He is very worried about damaging the block, but i dont see any other option to be honest as i have searched and search, and i cannot find much of a variety of sizes any where, let alone a 11.5mm bit.
Perhaps if he just went for it with the tap it might cut it - i haven't measured the threads...
Tom
Last edited by the mk1 kid; 03-10-2011 at 03:34 PM.
03-10-2011, 03:35 PM
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Did you drill yours by hand?
The block is very much still in the tractor...
Tom
03-10-2011, 03:43 PM
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I did it with the engine still in place , there was enough space to get the hand drill in place , I worked out what angle I needed to be drilling at and just took my time checking that I was drilling at the right angle . The sump was alloy so it was easier going , Ive helicoiled into a steel head on a V8 but the engine was out so access wasnt the problem.
As long as you got enough space to get the drill and bit into the correct line to drill then hand drilling should not be a problem
03-10-2011, 03:48 PM
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I did it with the engine still in place , there was enough space to get the hand drill in place , I worked out what angle I needed to be drilling at and just took my time checking that I was drilling at the right angle . The sump was alloy so it was easier going , Ive helicoiled into a steel head on a V8 but the engine was out so access wasnt the problem.
As long as you got enough space to get the drill and bit into the correct line to drill then hand drilling should not be a problem
As long as you got enough space to get the drill and bit into the correct line to drill then hand drilling should not be a problem
There is plenty of room, and if he were keen on bolting down his small pillar drill to the deck i think it would be a piece of cake, but he isn't.
I will pass this one, but i can see him paying £100 for the local engineering company to pop down and drill it by hand! So daft when you consider the work he does on them...
Cheers
Tom
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03-10-2011, 03:49 PM
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03-10-2011, 03:56 PM
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03-10-2011, 03:57 PM
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03-10-2011, 08:19 PM
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TBH if the block is easily accessible then there isnt any reason why you couldnt do it by hand.
just be careful and have someone keep an eye on the drill to ensure it stays straight.
Even something as dodgy as this would be helpful
http://www.axminster.co.uk/axminster...ide-prod22269/
I drilled and tapped a Rover V8 block once for 1/2" studs using one of them. it was working perfectly until a total lack of patience got the better of me
For the ones I didnt get straight, a big hammer and block of wood forced the head over the studs lol
They torqued up fine and worked superbly. When it came time to strip the engine, the heads lifted off fine.
But if you are sensible and patient, hand drilling will be fine.
And any Helicoil kit will come complete with drill/tap etc. The long inserts might be best for head bolts too, as there are short/normal and long inserts available.
just be careful and have someone keep an eye on the drill to ensure it stays straight.
Even something as dodgy as this would be helpful
http://www.axminster.co.uk/axminster...ide-prod22269/
I drilled and tapped a Rover V8 block once for 1/2" studs using one of them. it was working perfectly until a total lack of patience got the better of me
For the ones I didnt get straight, a big hammer and block of wood forced the head over the studs lol
They torqued up fine and worked superbly. When it came time to strip the engine, the heads lifted off fine.
But if you are sensible and patient, hand drilling will be fine.
And any Helicoil kit will come complete with drill/tap etc. The long inserts might be best for head bolts too, as there are short/normal and long inserts available.
03-10-2011, 08:36 PM
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Helicoil sets we have don't even tell you what size hole to drill we have to consult a chart lol
11.5mm drills we get from Cromwell tools in Manchester or possibly as till and whitehead to source. Type in 11.5mm HSS drill bit into google and take your pick. Not a rare size by any means
11.5mm drills we get from Cromwell tools in Manchester or possibly as till and whitehead to source. Type in 11.5mm HSS drill bit into google and take your pick. Not a rare size by any means
03-10-2011, 09:49 PM
#15
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From what your saying i think your talking about a rotabroach cutter these are whats normaly used in a Mag drill, you can buy them from welding supplyers or any place that sell industrial fabraction equipment if not plenty of places on the net http://www.tool-net.co.uk/p-349287/r...p110-11mm.html, no half size's though
How ever using this type of cutter could do more harm than good as there is no pilot getting it centerd over an orginal hole could be dificult, also need to make sure there is enugh meat around the hole to drill out bigger for the helicoil might end up into a water way.
How ever using this type of cutter could do more harm than good as there is no pilot getting it centerd over an orginal hole could be dificult, also need to make sure there is enugh meat around the hole to drill out bigger for the helicoil might end up into a water way.
06-10-2011, 10:07 AM
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TBH if the block is easily accessible then there isnt any reason why you couldnt do it by hand.
just be careful and have someone keep an eye on the drill to ensure it stays straight.
Even something as dodgy as this would be helpful
http://www.axminster.co.uk/axminster...ide-prod22269/
I drilled and tapped a Rover V8 block once for 1/2" studs using one of them. it was working perfectly until a total lack of patience got the better of me
For the ones I didnt get straight, a big hammer and block of wood forced the head over the studs lol
They torqued up fine and worked superbly. When it came time to strip the engine, the heads lifted off fine.
But if you are sensible and patient, hand drilling will be fine.
And any Helicoil kit will come complete with drill/tap etc. The long inserts might be best for head bolts too, as there are short/normal and long inserts available.
just be careful and have someone keep an eye on the drill to ensure it stays straight.
Even something as dodgy as this would be helpful
http://www.axminster.co.uk/axminster...ide-prod22269/
I drilled and tapped a Rover V8 block once for 1/2" studs using one of them. it was working perfectly until a total lack of patience got the better of me
For the ones I didnt get straight, a big hammer and block of wood forced the head over the studs lol
They torqued up fine and worked superbly. When it came time to strip the engine, the heads lifted off fine.
But if you are sensible and patient, hand drilling will be fine.
And any Helicoil kit will come complete with drill/tap etc. The long inserts might be best for head bolts too, as there are short/normal and long inserts available.
Helicoil sets we have don't even tell you what size hole to drill we have to consult a chart lol
11.5mm drills we get from Cromwell tools in Manchester or possibly as till and whitehead to source. Type in 11.5mm HSS drill bit into google and take your pick. Not a rare size by any means
11.5mm drills we get from Cromwell tools in Manchester or possibly as till and whitehead to source. Type in 11.5mm HSS drill bit into google and take your pick. Not a rare size by any means
From what your saying i think your talking about a rotabroach cutter these are whats normaly used in a Mag drill, you can buy them from welding supplyers or any place that sell industrial fabraction equipment if not plenty of places on the net http://www.tool-net.co.uk/p-349287/r...p110-11mm.html, no half size's though
How ever using this type of cutter could do more harm than good as there is no pilot getting it centerd over an orginal hole could be dificult, also need to make sure there is enugh meat around the hole to drill out bigger for the helicoil might end up into a water way.
How ever using this type of cutter could do more harm than good as there is no pilot getting it centerd over an orginal hole could be dificult, also need to make sure there is enugh meat around the hole to drill out bigger for the helicoil might end up into a water way.
Thanks guys, hand drill it is then!
Tom
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