|
|
|
|
#1
|
||||
|
||||
I've not bought them yet but there are reverse drill bits available. Basically it drills in reverse helping in a situation like this.
Start spraying with a real good penetrating oil. The best one I've found is made by Mopar. Drill the hole best as you can in the center, if you get lucky and stay centered and drill to the end of the bolt you can scoot more penetrating oil to the rear. Then use an extractor and hope for the best. If all else fails, you will have to Heli-coil it.
__________________
 '75 Cuddy with '00 Johnson Ocean Pro 150 horse Benny 
|
|
#3
06-13-2012, 09:45 PM
|
||||
|
||||
|
left hand rill bit, take your time and center punch the bolt, try as best as you can to get it dead in the center. Start with a smaller bit adn work your way up, as you get loser to the actual size, it may spin whats left of the bolt out.
|
|
#4
06-14-2012, 12:26 AM
|
||||
|
||||
A nice litte trick to use. Since, by the pics, it looks like you have several threads down into the hole before you come to the broken bolt. Take a short, same size bolt (looks like a 3/8 from the pics) and put it into a vise in your drill press. Center punch the bolt in the center, then drill a small (1/8th) hole all the way thru the bolt. Thread the bolt into your engine and using the same drill, drill your first hole into the broken off bolt. The pilot hole will keep your drill bit from walking and you'll get a nice hole down the center of the broken off bolt. Then just unbolt the pilot hole bolt, and start working on the broken off one, either with a left hand drill or using ez-outs or whatever. The real trick to getting the bolt out without messing up the threads in your block is to make that first hole as nearly centered in the broken off bolt as possible.
__________________
1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer 1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer 1996 V21 w/1993 200HP Mercury on a Shoreline Trailer All towed by a 5.7L Hemi Durango. If God didn't have a purpose for us we wouldn't be here, so Live simply, Love generously, Care deeply, Speak kindly. (Leave the rest to God)  Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
|
|
#5
06-14-2012, 07:29 AM
|
||||
|
||||
|
I don't envy you on that broken bolt. Nothing much to add other than some support. Been there myself recently. Good advise from all here. Left hand drill bits work very nice, torque in the right direction and builds a little heat while drilling. Before I drill I try to peck on the broken bolt with a hammer and drift.
__________________
 1996 -19' NV Flats 115 Mercury 4-stroke 1983 -20' Wellcraft Center Console 250 XS
|
|
#6
06-14-2012, 08:37 AM
|
||||
|
||||
|
broken bolt
Ok I'm going to try the left hand dril first then I'll try drilling it all the way out and use helicoil.
When I get that done can some one give me the torx spec to bolt back that exh manifold?
__________________
1985 Wellcraft v20 Step up Cuddy 3.7 L4 Merc 165 Hp
|
 |
| Thread Tools | |
| Display Modes | |
|
|
Hybrid Mode
