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Old 02-25-2021, 11:11 PM
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%[email protected]$&!!! I broke two bolts off putting the water pump pulley back on.

The thermostat housing was leaking in my "new" car so I decided to change the water pump while I was at it. But it seems I'm stronger than I think. Putting it back together I was alternating diagonally across the bolts trying to get them evenly tight and I snapped two heads off! Now what?

How do I get them out? Can I drive the car short distances in the meantime? My other car is apart and I wouldn't have been working on this one except for a big hole in the thermostat housing.
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Old 02-25-2021, 11:37 PM
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You may be better off just replacing the water pump. You could try pulling your existing water pump out and drilling out the broken bolts, but you will need to retap the threads and use larger bolts in the pulley

I think I would replace the water pump
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Old 02-25-2021, 11:49 PM
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Those are pretty small screws so it doesn't take a lot of torque to snap them. Get yourself a cheap torque wrench at Harbor Freight. Something is better than nothing.
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Old 02-25-2021, 11:50 PM
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Quote:
Originally Posted by Effduration View Post
You may be better off just replacing the water pump. You could try pulling your existing water pump out and drilling out the broken bolts, but you will need to retap the threads and use larger bolts in the pulley

I think I would replace the water pump
I guess that makes sense. Sort of sad, but probably right. I could even temporarily put the old pump back in. It seems fine, original BMW part from when the car was built in 2005, but it would keep me going. I would need new screws. REALOEM lists them as M6X16-U1-8.8, does anyone know what that means if I try to source them locally?
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Old 02-25-2021, 11:53 PM
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Quote:
Originally Posted by upallnight View Post
Those are pretty small screws so it doesn't take a lot of torque to snap them. Get yourself a cheap torque wrench at Harbor Freight. Something is better than nothing.
Yea. I didn't find any torque specs for them but that is a good idea if I can find the specs. I really had no notion of how far to take them.

I actually have a Schwaben torque wrench on order from Pelican Parts for several weeks now but it hasn't gotten here.
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Old 02-26-2021, 12:22 AM
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Those might come out fairly easy. Those are not any special kind of bolt and I wouldn't worry about using what ever you can find just be careful about the length. Maybe put the originals across from each other.
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Old 02-26-2021, 01:10 AM
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The bolt is m6-1.0x16 8.8

Spec is 7.5 ft·lb or about one strong pinky pull. Spec is usually 80% of yield Soo 7.5/.8=9.375 ft·lb to plastic deformation where it just stretches until destruction basically 10 ft·lb is enough to destroy the bolt.

Unfortunately you broke both on one side of the square I wouldn't drive that. Fortunately the hub of the water pump is open on the back and would not be difficult to drill out the broken bolts you can probably use left hand drill bits and get them out you only need 10 ft·lb torque.

Also: if the hub is tight like the wheels to center the pulley, turn the whole thing 45°and drill four new holes.

I have right angle drill adapter I could do it in place.
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Old 02-26-2021, 01:32 AM
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Originally Posted by andrewwynn View Post
The bolt is m6-1.0x16 8.8

Spec is 7.5 ft·lb or about one strong pinky pull. Spec is usually 80% of yield Soo 7.5/.8=9.375 ft·lb to plastic deformation where it just stretches until destruction basically 10 ft·lb is enough to destroy the bolt.

Unfortunately you broke both on one side of the square I wouldn't drive that. Fortunately the hub of the water pump is open on the back and would not be difficult to drill out the broken bolts you can probably use left hand drill bits and get them out you only need 10 ft·lb torque.

Also: if the hub is tight like the wheels to center the pulley, turn the whole thing 45°and drill four new holes.

I have right angle drill adapter I could do it in place.

Thanks. 10 lbs is not a lot, even I know that! I def went too far.

The short term choice seems to be get some bolts locally and put the old pump back in for the time being or get the other car roadworthy and sort this out with some time. Parts I need for the '01 are arriving tomorrow by 8 pm. But what will I F up there?
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Old 02-26-2021, 01:35 AM
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If you remove the two good bolts, good chance you can extract the other two with the few possibilities, then get four new bolts before you likely stretched the two remaining bolts. The hub is open in back I'm sure there is extra room for four mm so a 20mm bolt would work or a 15mm also would likely work.
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Old 02-26-2021, 01:50 AM
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Pull the 2 good bolts and take the pulley off and then get ready to use good condition or new vice grips...

Unless they ended up cockeyed from getting snapped off you should be able to turn them even from the back if they protrude enough.

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