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Are both metric/sae size bolts on 90 Dynasty?
04-21-2010, 11:51 AM
Post: #1
Are both metric/sae size bolts on 90 Dynasty?
HI,

I have had to use SAE size wrenches from time to time on the Dyna because metrics don't fit.

I just replaced a wheel cylinder and the attaching bolts were 8mm exactly, but the fluid line nut was between a 9 and 10mm so I had to use a 3/8inch SAE which fit perfectly.

Is Dodge making their cars using both metric and SAE size nuts/bolts?

Thanks,

chilln
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04-21-2010, 10:02 PM (This post was last modified: 04-21-2010 10:04 PM by Rupe.)
Post: #2
RE: Are both metric/sae size bolts on 90 Dynasty?
Yes, it's common to have a mix of fasteners on cars today but with a 20 year old car someone may have already replaced a brake line or wheel cylinder. OTOH, I'm guessing the bolts are 5/16" which is a pretty close fit for 8 mm.

BTW, the reason for this is where the parts originate. Many of the Chrysler drive lines are "borrowed" from Mitsubishi so that part is all metric. In the case of body parts it will depend on a car being "world market" versus a north American market and even then you may still find a mix although it may be slanted more in one direction or the other depending on where the part is manufactured.
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04-22-2010, 03:22 PM (This post was last modified: 04-22-2010 03:35 PM by chilln.)
Post: #3
RE: Are both metric/sae size bolts on 90 Dynasty?
Thanks for the response,

8mm fit the wheel cylinder bolt nice and snug for a perfect fit. I may try a 5/16th on it sometime just to see how it fits.

From my experience it is mostly metric nuts and bolts and the closest SAE will usually round them out (and I use quality tools). e.g.: 8mm valve cover bolts, 15mm belt pulley bolt, 8mm pan bolts, etc.

chilln
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04-22-2010, 09:57 PM
Post: #4
RE: Are both metric/sae size bolts on 90 Dynasty?
Correct but there are a few sizes that are so close you can't tell unless you compare the thread pitch.

The following are so close you will never have a problem.

8mm = 5/16
11mm = 7/16
17mm = 11/16
19mm = 3/4
21mm = 13/16
22mm = 7/8
24mm = 15/16
25mm = 1

Always handy to know when you need a second or third wrench on a job, or one that is just shaped different!

Do not mix the following.... 3/8 and 10 mm, 1/2 and 13mm, 9/16 or 5/8 for a 14 or 15 or 16mm and there's nothing to cross for 18 or 20mm either.

The only exceptions would be a head that is so rusty that it falls between sizes. What have you got to loose there?
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