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Old 02-19-2006, 03:54 PM   #1
flyhop
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Default Need to remove crankshaft pulley bolt. What size?

I am replacing the front crankshaft oil seal. I will need to get a deep socket and breaker bar. Anybody know the right size?

Once I get this far into the repair, I won't have wheels to get me to store to buy the correct sized socket.

Thanks.

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Old 02-19-2006, 04:25 PM   #2
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Default Re: Need to remove crankshaft pulley bolt. What size?

22mm, check the How-To Library on how to do it. It can be a bear sometime.

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Old 02-19-2006, 04:28 PM   #3
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Default Re: Need to remove crankshaft pulley bolt. What size?

Romzek...thanks for that. I read and re-read the How-To posts. I think a small bottle jack under end of breaker bar should get it for me. Thanks again.

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Old 02-19-2006, 05:21 PM   #4
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Default Re: Need to remove crankshaft pulley bolt. What size?

I tried for 20 minutes to get that bolt off... Finally threw some penetrating oil on it and whammy, came right off with the impact wrench (life saver). I didnt even try the oil at first because i knew the threads go so far into the crank it wouldnt matter. But i think what happens is the washer around the bolt rusts right to the crank pully. Penetrating oil took care of that

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Old 02-19-2006, 06:55 PM   #5
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Default Re: Need to remove crankshaft pulley bolt. What size?

Quote:
Originally Posted by romzek
22mm, check the How-To Library on how to do it. It can be a bear sometime.
There may be some variety. 22mm is too big. 9/16" is just right. FYI...

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Old 02-19-2006, 09:19 PM   #6
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Default Re: Need to remove crankshaft pulley bolt. What size?

Quote:
Originally Posted by flyhop
There may be some variety. 22mm is too big. 9/16" is just right. FYI...

9/16 is no where close to being right. 7/8 is the closest to 22mm.

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Old 02-19-2006, 09:41 PM   #7
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Default Re: Need to remove crankshaft pulley bolt. What size?

Quote:
Originally Posted by flyhop
There may be some variety. 22mm is too big. 9/16" is just right. FYI...
FYI--there isn't an SAE fastener ANYWHERE on ANY Saturn...EVERYTHING is metric. If you're using a standard socket on any fastener on a Saturn and just about every other car manufactured after 1986 or so...you're using the WRONG tool. Everything is metric. I've been wrenching for a little over 15 years and I don't even own any sockets or wrenches in standard sizes.

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Old 02-19-2006, 10:04 PM   #8
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Default Re: Need to remove crankshaft pulley bolt. What size?

On my 1994 SW2 I used a 12 point 13/16 - 1/2 inch size socket. It was a perfect fit.
Also, I recommend getting a 2 foot pry bar, and a 1/2 inch breaker bar. At the end of the breaker bar you might need more leverage. So you might want to get yourself a 2 foot steel pipe to stick on the end of your breaker bar.
Take the pry bar and wedge it in between the pulley and the engine. Be careful not to move the crank from TDC (Top dead center). You will be going counter clockwise to get the bolt off (which is torqued at 159lbs.) So with your breaker bar and the steel pipe, it shouldn't take that much strength to get it off.

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Old 02-19-2006, 10:25 PM   #9
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Default Re: Need to remove crankshaft pulley bolt. What size?

Quote:
Originally Posted by SaturnTech
FYI--there isn't an SAE fastener ANYWHERE on ANY Saturn...EVERYTHING is metric.
I've found two weird exceptions to this so far in my car. The bolts that attach the battery cables to the side post battery terminals are 5/16'' SAE - obviously aftermarket cables. And I found a 5/16'' hex bolt that the previous owner used to replace one of the stock 7mm male Torx bolts under the passenger seat.

A quick trip to the junkyard and Autozone would take care of both of these issues, but they're way down on my priority list right now.

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Old 02-19-2006, 10:51 PM   #10
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Default Re: Need to remove crankshaft pulley bolt. What size?

As SaturnTech said the fasteners on the car are all metric. The reason that you can use some standard tools is that some of the sizes are close enough to match each other.
5/16 is about 8mm
7/16 is about 11mm
Plus others.

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Old 02-19-2006, 10:58 PM   #11
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Default Re: Need to remove crankshaft pulley bolt. What size?

Quote:
Originally Posted by asgardshill
I've found two weird exceptions to this so far in my car. The bolts that attach the battery cables to the side post battery terminals are 5/16'' SAE - obviously aftermarket cables. And I found a 5/16'' hex bolt that the previous owner used to replace one of the stock 7mm male Torx bolts under the passenger seat.

The battery cables are held on with 8mm bolts on my car. That may be just my car, though, hehe.

My crankshaft pulley bolts on all 4 engines that i have are 21mm. Granted all my engines are from 1991-1996 SC2's. 21mm still has a VERY small bit of play on the bolt, so 22mm would be obviously too big. Every time i have pulled out an engine (which taking the crankshaft pulley off helps tremendously) i have used a 21mm. i have replaced 3 engines in my 1993 and 4 in my 1995. Yeah, so i run the schiza out of my cars. You will have a 21mm socket in any standard bought tool set, if it comes with 3/4, 1/2, and 1/4 inch socket wrenches. Hope this helps.

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Old 02-19-2006, 10:59 PM   #12
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Default Re: Need to remove crankshaft pulley bolt. What size?

Quote:
Originally Posted by ssicarman
As SaturnTech said the fasteners on the car are all metric. The reason that you can use some standard tools is that some of the sizes are close enough to match each other.
5/16 is about 8mm
7/16 is about 11mm
Plus others.

a VERY common mismatch is 1/2" and 13mm. SaturnTech and ssicarman are exactly right.

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Old 02-20-2006, 12:18 AM   #13
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Default Re: Need to remove crankshaft pulley bolt. What size?

Wow. Lot of flak over a typo.

It wasn't 9/16; it was 13/16. 22mm was too loose; I moved to 13/16 as I didn't want to round over the bolt.

Anyway, it worked, the new front seal is in, the car's been run for a while, and cardboard's under engine tonight to spot any tell-tale leaks.

thanks.

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Old 02-20-2006, 06:38 AM   #14
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Default Re: Need to remove crankshaft pulley bolt. What size?

I glad you got it fixed....but I will also chime in to say that I would NEVER use an inappropriate and 12 POINT! sized socket on a critical and high torque fastner such as the crankshaft pulley bolt. Had you managed to round that puppy off, you'd be so far up the creek that you couldn't catch a bus back to just plain up the creek...

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Old 02-20-2006, 10:59 AM   #15
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Default Re: Need to remove crankshaft pulley bolt. What size?

Quote:
Originally Posted by wolfman
I glad you got it fixed....but I will also chime in to say that I would NEVER use an inappropriate and 12 POINT! sized socket on a critical and high torque fastner such as the crankshaft pulley bolt. Had you managed to round that puppy off, you'd be so far up the creek that you couldn't catch a bus back to just plain up the creek...
Your exactly right, I got lucky in getting off the crank bolt with a 12 point socket. Six point is the safer way to approach this bolt.

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Old 02-20-2006, 12:00 PM   #16
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Default Re: Need to remove crankshaft pulley bolt. What size?

Before putting the wrench to it, I placed the 22mm socket over the bolt only to find a fair amount of play. It was just NOT a snug fit.

I found a 13/16" (6 pointer...I paid attention to a long-ago post from Wolfman) to be the right fit. Lots of tugging, grunting and groaning, and the bolt came off. Getting it back on was a little easier; I lay on my back, held onto the car's underside and used my foot on the end of the torque wrench. The wife was kind enough to tell me when it hit 159.

So far, no leaks! Took a good number of pics, and I'll post those soon.

Thanks again to all.

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Old 02-20-2006, 01:51 PM   #17
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Default Re: Need to remove crankshaft pulley bolt. What size?

I wonder if somebody in the past replaced that bolt with an odd one???

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Old 02-20-2006, 02:05 PM   #18
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Default Re: Need to remove crankshaft pulley bolt. What size?

Quote:
Originally Posted by Old_Coot
I wonder if somebody in the past replaced that bolt with an odd one???
You know, that is a possibility that crossed my mind earlier today. This is the second engine in this SL2. My old one threw a rod (hard lesson in "check your oil regularly"). This new engine had 97,000 miles on it, and came out of an SL2 automatic.

Maybe someone did change it...I don't know. Anyway, it's fixed and not leaking. Thanks for the continued responses. I'm learning a lot.

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Old 02-25-2006, 08:18 PM   #19
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Default Re: Need to remove crankshaft pulley bolt. What size?

Hi, I just wanted to chime in about the odd sized crank pulley bolt. I just this week started an engine rebuild on an engine from a 96 SC2, and the bolt size was 21 mm. I firmly second Wolfman's comment (as if he needs anyone's second opinion for it to be gospel ) about using the proper size and making sure it's a six point socket. I'd also made sure it was at least a 1/2" drive socket, the torque on that was HIGH.

This engine was also a rebuild that I foolishly let a local shop do. It wouldn't surprise me at all if it weren't the original bolt after everything else I found wrong with that "fixed" engine. That's why I'm getting ready to do another rebuild. But that is another thread!

By the way, first time poster! I love this forum!

Ken

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Old 03-27-2006, 01:21 PM   #20
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Default Re: Need to remove crankshaft pulley bolt. What size?

I haven't posted much here but it doesnt take a genius to do some simple fractions. If we're going to argue standard and metric lets keep in mind that these are just simple methods of measuring distance. Metric does it neatly in units of 10, standard is just a mess based on ancient mathematic principles. If you think about it an inch has 25.4 millimeters in it. A 13/16" ratchet bit will provide for 20.6 mm of clearance. If you can get this standard bit to fit (even though God himself might **** on you for using a standard bit on a metric bolt) you will actually guarantee a tighter fit than the 21 mm bit. Most tools are manufactured to an exacting degree of precision so that 21mm bit is at least 20.9 - 21.1 mm and the 13/16" is going to be damn close to 13/16". Pretty much what I'm getting at is if you have a standard and a metric that seem to fit , do the simple math and find which is smaller. The smaller the bit the tighter the fit and the less likely you are to shred your grip. This is a 159 ft-lb torqued bolt, do not strip it.

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