Transmission linkage broken bolt suggestions
#1
Rennlist Member
Thread Starter
Transmission linkage broken bolt suggestions
Found this problem courtesy of a previous mechanic. The bolt head to the transmission selector is broken off. Anyone have any suggestions on removing it? I was thinking of drilling the center with a right angle attachment on a dremel but even this will be tough given how cramped it is. Other choice was transmission removal so that I have more room to drill it out but seems silly to drop the tranny for this bolt.
#2
Rennlist Member
Heat the bolt and lever arm with a propane or MAP gas torch (plumber's torch), to break down the thread locker and gain a little less interference. Walk the bolt out by tapping with a hammer and chisel to turn it. This should work well assuming the bolt was not cross-threaded or otherwise abused. If this doesn't work, I would probably put a horizontal cut through the bolt shaft and lever arm with a composite disk on a die grinder or dremel type tool, replace the linkage with a good used one (I have plenty).
Kevin
Catellus Engineering
Kevin
Catellus Engineering
#4
Rennlist Member
Thread Starter
I have no welding equipment. Torch and cold chisel did not work. The remnant is in so tight that it is just deforming with each hit with the chisel. Going to try to drill it out next.
Anyone have a selector arm cheap if I end up cutting it off?
Anyone have a selector arm cheap if I end up cutting it off?
#5
I still have the one removed for my SSK.
#7
Drifting
Join Date: Jul 2002
Location: goodlettsville,tn
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You will save yourself a lot of time and effort by dropping the tranny. Not that hard to drop the tranny out. I'm north of Nashville, and have several extra arms if you need one.
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#8
Remove the selector rod from the trans. Drill out the screw remenants. Tap to next available size. Stick the size bolt needed for the new treads. I would try a #7 bit and a 1/4-20 bolt. Start with a smaller bit of course then work your way up.
#9
You could try drilling and using an easy out. I agree with torching the arm, not the bolt just before using the easy out in the drilled hole.
Alternatively, you could use a left hand drill. I think one of the typical places where we purchase Porsche tools has them. Or you might be able to find them locally.
And, finally you may be able to lower the tranny, leaving the axles, etc. connected. I don't know how much you can drop it this way, but I'd guess you could get a few inches. Just disconnect the upper tranny mount, and dropping it a bit. This will put a torque load on the engine mounts. So I think I'd loosen (but don't remove) the two bolts where the mounts bolt to the brackets off the engine, allowing the engine to rock back a bit. You'll still have to watch interference with the firewall, but a half an inch at the engine to firewall should give you inches of drop at the tranny. May just give you the space you need to work it out.
Alternatively, you could use a left hand drill. I think one of the typical places where we purchase Porsche tools has them. Or you might be able to find them locally.
And, finally you may be able to lower the tranny, leaving the axles, etc. connected. I don't know how much you can drop it this way, but I'd guess you could get a few inches. Just disconnect the upper tranny mount, and dropping it a bit. This will put a torque load on the engine mounts. So I think I'd loosen (but don't remove) the two bolts where the mounts bolt to the brackets off the engine, allowing the engine to rock back a bit. You'll still have to watch interference with the firewall, but a half an inch at the engine to firewall should give you inches of drop at the tranny. May just give you the space you need to work it out.
#10
Three Wheelin'
That transmission mount looks new, has the tranny been out recently?
I'd cut the arm and get one from Todd I hate dropping trannies. Are you installing a short shift? The linkage looks fine.
I'd cut the arm and get one from Todd I hate dropping trannies. Are you installing a short shift? The linkage looks fine.
#11
Intermediate
Join Date: Apr 2012
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I had a similar issue on the transmission, and had a small bolt welded on at my local muffler shop. It took 20 seconds and they did if for free while I was having some exhaust work done.
#12
Rennlist Member
Thread Starter
I am waiting for some hansen extractors and left hand drill bits to arrive so have not made any more progress yet.
#13
Rennlist Member
Thread Starter
I have a time consuming habit of zinc plating everything. Trans mount is old but "refurbished" with urethane as seen in my write up here:
https://rennlist.com/forums/924-931-...-tutorial.html
BTW, I'm in Brentwood. Not too many 944's around it seems.
#14
Drifting
How much did you heat the thing when you tried the torch and chisel method?
I find that with propane, it's always hard to get enough heat into the part. I'd try to get it red hot, that should break it loose.
I was trying to get a bottom bracket out of a bicycle, I tried and tried to heat it with propane but it would not budge a bit. I ended up welding something to it, just the heat from welding broke it loose.
I find that with propane, it's always hard to get enough heat into the part. I'd try to get it red hot, that should break it loose.
I was trying to get a bottom bracket out of a bicycle, I tried and tried to heat it with propane but it would not budge a bit. I ended up welding something to it, just the heat from welding broke it loose.
#15
Rennlist Member
Thread Starter
How much did you heat the thing when you tried the torch and chisel method?
I find that with propane, it's always hard to get enough heat into the part. I'd try to get it red hot, that should break it loose.
I was trying to get a bottom bracket out of a bicycle, I tried and tried to heat it with propane but it would not budge a bit. I ended up welding something to it, just the heat from welding broke it loose.
I find that with propane, it's always hard to get enough heat into the part. I'd try to get it red hot, that should break it loose.
I was trying to get a bottom bracket out of a bicycle, I tried and tried to heat it with propane but it would not budge a bit. I ended up welding something to it, just the heat from welding broke it loose.
I was also a little chicken since there is a plastic fuel tank full of gas just 4 inches above the bolt that I was heating. I can just see the news headlines now.... "Porsche and garage up in flames"