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  #16  
Old 04-22-2005, 11:40 AM
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cinder blocks are not safe

Period. Don't put anything heavy on them. They are ok, maybe if they are new, but if they've been in the weather or through cold winter, there are cracks in them that form, which can lead to sudden failure. Wood blocks are much better.

I made some wood ramps out of 2x6's that are heavy, but really solid. I have four of them. Two are smaller so that I can raise the car more in the front or back depending on the job. But I use all four at the same time. I use them on a cement pad so they are level and plumb.

DS
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  #17  
Old 04-22-2005, 11:45 AM
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The term "cinder block" implies a much weaker construction material when compared to what is termed a "concrete block". I have successfully used concrete blocks for this type of auto raising duty for years. Have always used the block with the holes pointed up and cover with a 1" x 8" piece of lumber to effectively spread the load out over the available top section of the block. Remember that industrial buildings are constructed of this material and it holds up very large loads, just need to keep it in compression and not have sharp load points.

Even large wood blocks should be topped by a sacrificial 1" x 8" to prevent the main block from being split by sharp load points.
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  #18  
Old 04-22-2005, 12:21 PM
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The concrete/stone mix blocks I have are solid as a natural rock. They weigh about 45lbs (small one) and 75+ lbs (bigger one) They're extremely sturdy.
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  #19  
Old 04-22-2005, 04:29 PM
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The concrete blocks I am using are setting "holes up" and the holes are filled with earth, so even in the unlikely event that the blocks crumble to dust, the tires are still supported by 8 inches of earth.

I understand what you are saying though. If used incorrectly, for example if a lot of weight was concentrated on one point, blocks could certainly fracture.
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  #20  
Old 04-22-2005, 10:51 PM
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I took a 14mm hex key, put it into a 14mm box end wrench, and put the other end of the wrench inside a 4' length of pipe.

Wasn't too hard with that length of pipe as a lever, but I was wondering at the time what I was going to do if I twisted the plug out of it's threads

Of course I had it sitting on jack stands plus a floor jack, and the wheels chocked.

But it worked out just fine. So fine that I did my other car shortly afterwards.

- Patrick
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  #21  
Old 04-23-2005, 01:51 PM
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Thumbs up

Jeez... they're that tight? Looks like I'll hose them down with some penetrant first and perhaps add some heat to the mix to help.

The quart of Syn diff oil I have has been staring menacingly at me for about six weeks now.

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