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post #1 of 8 (permalink) Old 10-07-2009, 12:00 PM Thread Starter
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them bolts

Today my genius brain figured out that it wanted to take out the thermostat from my 1984 380 sel and test if it worked properly, since my car never get properly warm when driving. Only up to 70-60 degrees.

When im loosening the bolts (3 of em) on the thermostathouse all of them breakes .

Well, looks like these bolts havent been out for a long time, maybe never??
Anyhow, reading about bolt extractors and stuff I was wondering if any here have any experience with that?

Another way to get the bolts out would be to drill them out, but im not sure what ppl mean when they say "drill them out"...
Drill many holes in the bolt until there is not much left of the bolt?? Basically destroying the bolt with a drill...

I cant pull them out cos the bolts broke to far down.
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post #2 of 8 (permalink) Old 10-07-2009, 02:13 PM
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I did the same thing on a w126 a few years ago. Those bolts do not need a lot of torque. You need an easy out. You can pick one up at just about any hardware store.
As for your heat not working, do a search for "monovalve" on the w126 forum.

Mike
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post #3 of 8 (permalink) Old 10-07-2009, 04:24 PM
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I noticed you are from Norway, so what we call things here may not be familiar to you. Go to a store that sells tools for machinists (a hardware store) and ask them for a "screw extractor" or a "bolt extractor." It is a tapered device that has reverse threads. You drill a hole in the bolt you want to remove, and screw that device into the bolt. As you "tighten" the extractor, it loosens the bolt and backs it out of the hole.

Now that I have described it, you may be familiar with it.

Good luck.

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post #4 of 8 (permalink) Old 10-07-2009, 09:02 PM
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What may be easier is to get some Allen or hex head type screws and a drill-tap combination (or separate) with left hand thread to drive the broken screws out. Meanwhile you get this, start softening those broken screw threads with WD40 or other rust removing oil.
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post #5 of 8 (permalink) Old 10-07-2009, 09:55 PM
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WD40 is lousy penetrant.
in US we do have PB Blaster, I heard about Knoll in Europe.
Now examine why the bolts broke? If they are frozen on the thread because on the corrosion - no extractor will remove them unless the penetrant does the wonder.
there is nothing worse than removing broken, hardened steel extractor from the hole. TRUST ME ON THIS ONE.
So bottom line -start with drilling small hole to keep it on the center of broken bolt, Follow with bigger one in the size recommended by extractor. After letting the penetrant to work overnight try to put some torque on the extractor. Ideally would be find the safe torque for the extractor and not to exceed it.
If the extractor doesn't work -just drill the darn thing out ant retap.
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post #6 of 8 (permalink) Old 10-08-2009, 08:46 AM
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Quote:
Originally Posted by Kajtek1 View Post
WD40 is lousy penetrant.
in US we do have PB Blaster, I heard about Knoll in Europe.
Now examine why the bolts broke? If they are frozen on the thread because on the corrosion - no extractor will remove them unless the penetrant does the wonder.
there is nothing worse than removing broken, hardened steel extractor from the hole. TRUST ME ON THIS ONE.
So bottom line -start with drilling small hole to keep it on the center of broken bolt, Follow with bigger one in the size recommended by extractor. After letting the penetrant to work overnight try to put some torque on the extractor. Ideally would be find the safe torque for the extractor and not to exceed it.
If the extractor doesn't work -just drill the darn thing out ant retap.
x2 on this advice. WD 40 is worthless (IMHO) as a penetrant, use PB blaster or even better Areo Kroil if you can find it. Spray it on, then give the top of the bolt a few good taps with a punch and hammer, let set overnight, a few more taps then on to the extractor. Be very careful with an extractor, you break it and about the only way to remove it is going to be to find someone who can use an EDM machine to burn it out, not a good thing. If the bolt doesn't turn reasonably easy with an extractor, repeat the overnight soak, if that doesn't work I go with the drill it out and retap or helicoil route.


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post #7 of 8 (permalink) Old 10-08-2009, 11:26 AM
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+1 on the PB blaster.

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post #8 of 8 (permalink) Old 10-09-2009, 07:39 AM
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Not at all unusual for those bolts to break. A good PM would be to anti-seize them every couple of years so that when the time comes, you will have a fighting chance. I did mine this spring.

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