I'm pretty new to this list, been lurking for awhile.
Nobody has mentioned heating the studs yet. I always use an oxy/mapp gas
torch to heat frozen bolts/studs until they are as cherry as I can get them.
If they are really bad, I use Kroil to help cool them, but usually I can
just turn them out. Soaking with penetrant may not work due to gravity, but
if they are hot first, they may draw the penetrant in.
I'd heat them prior to using the left hand drill bits.
HTH
Safety Fast!
Gordie Bird
62 MGA
80 MGB
>
>
> Excuse me for posting on the shop talk list about pre-war cars
> but it is
> related to shop work.
>
> I need a good way to remove 6 broken bolts/studs in a 34 Singer
> motor. I removed the oil pan on my car and found that it was
> only held in
> by 2 wood screws and 4 bolts as the other 6 bolts were broken in the
> block. I assume they were studs. 4 of them are broken almost flush with
> the block, one is going to easier since it is broken slightly inside the
> hole and the other is sticking out about 1/4" but I am not able
> to move it
> with vice-grips.
>
> I bought the car 2 years ago and finally am trying to get it
> on the road
> but I am unwilling to reassemble the oil pan with only 4 bolts.
> The motor
> is still in place and I can't flip it upside down on a drill
> press, I don't
> want to remove the motor and need to be careful of shavings although
> gravity should take of that for me. I need to drill these out
> but I never
> seem to be able to get the drills centered when drilling by hand
> and end up
> doing damage to the surrounding area, that will force me to put in
> helicoils but I am not sure I have the space since this is on the oil pan
> lip of the motor and only about 1/2 wide, it also looks like a
> pretty weak
> area. So drilling out is the only answer I can think of, I have
> purchased
> some left-hand drills since I have had good luck with those in
> the past at
> working out broken studs as they grab/drill into them but there are small
> 3/16" bolts, how do I center them ?
>
> The 2 holes where the wood screws were are another issue but I will
> tackle that one later as bolts still grab some threads and while I can't
> tighten them will hold a little.
>
> I am open to any ideas, short of removing the motor and doing it on a
> press, if I go that far I will take the motor apart and rebuild it, that
> will means months maybe a year before I get the car on the road.
>
> mike
>
> ~~~~~ I'd rather be sailing and ~~~ .oooO Oooo. ~~~~~~~~~~~
> Mike Rambour ( ) ( )
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