Broken head bolt issues
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On The Tree
Joined: Apr 2004
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Broken head bolt issues Was trying to remove a broken head bolt and drilled through the block straight down. Do I need a knew block or will the head bolt seal that area, or are there any other options?
I have worked on some older engines where the head bolt hole was not closed off and extended into a coolant passage, as long as there was sealant applied to the threads everything was fine
Most likely it will be ok, I dont know what is under there so I cant say 100% but there are other engines designed that way, if I remember correctly the ol small block chevy motors are that way.
Most likely it will be ok, I dont know what is under there so I cant say 100% but there are other engines designed that way, if I remember correctly the ol small block chevy motors are that way.
head bolt problem Which hole and how straight did you drill?
__________________
Steve Demirjian
Race Engine Development
Oceanside, Ca.
760-630-0450
web: www.raceenginedevelopment.com/
e-mail: race-engine-development@***.net
Steve Demirjian
Race Engine Development
Oceanside, Ca.
760-630-0450
web: www.raceenginedevelopment.com/
e-mail: race-engine-development@***.net
If the hole is only a quarter inch and straight, you should be fine. Here is a photo of where you drilled through. That little dome section to seal the head bolt is often times broken anyway.
__________________
Steve Demirjian
Race Engine Development
Oceanside, Ca.
760-630-0450
web: www.raceenginedevelopment.com/
e-mail: race-engine-development@***.net
Steve Demirjian
Race Engine Development
Oceanside, Ca.
760-630-0450
web: www.raceenginedevelopment.com/
e-mail: race-engine-development@***.net
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Thread Starter
On The Tree
Joined: Apr 2004
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can you heli coil the threads, also the threads are M11x1.75pitch which i cannot find anywhere the only thing I can find is m11x1.50. Also if I am to this point should I pull the block and let a machine shop do this or can I make a guide to square the drill and heli coil tap? and will the heli coil be able to hold to proper torque for the cylinder bolt? Can I use a m11x1.50 bolt if I cannot find the m11x1.75pitch
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Verdad Gallardo Threading The thread diameter and pitch is 11 mm x 2.0. You can get a Time Sert in there but the kit is expensive to purchase to install one insert.
I would go with a 7/16" x 14 stud with a long heli coil in that hole. That would be the least expensive fix if ARP or A1 has a long enough stud in that size.
Steve
I would go with a 7/16" x 14 stud with a long heli coil in that hole. That would be the least expensive fix if ARP or A1 has a long enough stud in that size.
Steve
can you heli coil the threads, also the threads are M11x1.75pitch which i cannot find anywhere the only thing I can find is m11x1.50. Also if I am to this point should I pull the block and let a machine shop do this or can I make a guide to square the drill and heli coil tap? and will the heli coil be able to hold to proper torque for the cylinder bolt? Can I use a m11x1.50 bolt if I cannot find the m11x1.75pitch
__________________
Steve Demirjian
Race Engine Development
Oceanside, Ca.
760-630-0450
web: www.raceenginedevelopment.com/
e-mail: race-engine-development@***.net
Steve Demirjian
Race Engine Development
Oceanside, Ca.
760-630-0450
web: www.raceenginedevelopment.com/
e-mail: race-engine-development@***.net
I would put plenty of sealer on the end of the bolt, and I'm sure you would be fine. I've done that with a header bolt that someone had drilled into the coolant jacket, and the customer didn't want to buy a new head. It's been a couple years, still no leak. The problem with a helicoil is that it won't seal the bottom.
