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  #1 (permalink)  
Old 11-12-2012, 05:01 AM
51 Chevy 3600
 

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Socket for crankshaft bolt?

I need some help. I didn't think I was that incompetent, but I prove myself wrong every day. Today's challenge. I want to manually turn over my chevy 350 but I can't get a socket over the crankshaft bolt. I tried every socket I had. The other bolts are 9/16 and look to be the same size as crankshaft bolt. I went to Napa and bought thinner walled socket, but It won't fit either. Do I need a special tool???

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Old 11-12-2012, 05:08 AM
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Best bet is to remove the pulley. Otherwise it'll take grinding down the OD of a chinese socket (one that you don't care about).

Be VERY careful turning the engine over using the crankshaft bolt! It's not made for that and if it snaps off your in for a lot of work. If you are bound to use it at least remove all the plugs and if the engine hasn't been started for some time turn it over using the starter to free things up.

There are tools that bolt in place of, or in some cases will mounts over the pulley (see image below). Much safer and easier to use, too. You can make this tool fairly easily. Click on images for info:


Last edited by cobalt327; 11-12-2012 at 05:34 AM.
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Old 11-12-2012, 07:25 AM
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If the H/B is off this works of the crankshaft key and is a good tool to have in your tool box.Don't try to turn over the engine off the crank bolt.




Proform Crankshaft-Turning Sockets 66901 - SummitRacing.com
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Old 11-12-2012, 07:53 AM
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I forgot to add...

Quote:
Originally Posted by cobalt327 View Post
Be VERY careful turning the engine over using the crankshaft bolt! It's not made for that and if it snaps off your in for a lot of work. If you are bound to use it at least remove all the plugs and if the engine hasn't been started for some time turn it over using the starter to free things up.
If for whatever reason you have to use the bolt, your safest bet is to turn it using a clicker torque wrench set to 65 ft/lbs. If the crank will turn at that setting, fine. But if you exceed that torque you are taking a chance on stripping the threads or breaking the bolt outright. Usually the threads will let go first, but there's no guarantee.

Still the best thing to do is a tool made for the purpose.

Good luck.

Last edited by cobalt327; 11-12-2012 at 07:56 AM. Reason: I forgot to add...
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Old 11-12-2012, 03:26 PM
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I bought the second turning tool (the flat one) that Cobalt posted thinking it was better because it had a large variety of mounting holes for different engines and the offset ratchet point offered greater leverage for turning hard engines, plus worked on 3/8" and 1/2" drive ratchets. These are all true and good advantages, but I soon realized after I had this mounted on my balancer that it would not clear the water pump, and even if it did the breaker bar would not clear it. Not only that, but since the ratchet holes are offset you cannot use the ratcheting action (you have to turn the bar a full 360 manually). Basically it is fine for building a shortblock on an engine stand, but that is about it.

The first one Cobalt posted fixes all these problems, and works on short and long blocks and an engine that is installed in the vehicle. You just lose a little leverage. I wished I had got this tool instead because it is much more flexible.
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Old 11-12-2012, 04:24 PM
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Thanks for the replys

Thanks for the link to the wrenches and the sound advice. I should have mentioned that the engine runs (Just really rough.) Since I wasn't sure what the guy before me had done, I planned on tuning it. I tried tuning by ear, but I must be deaf.. So I thought I would start fresh. Planned on pulling the spark plugs and locating TDC. Since it is just me ,myself and I, bumping it with the starter wasn't going to be easy. (that is why I was going to turn it by hand.) Can't tell you how much I appreciate this site. I have been stalking it for awhile trying to soak up some knowledge. I finaly have something to wrench on now and I know just enough to do some real damage!
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Old 11-12-2012, 04:34 PM
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Some info on finding TDC: Click here.
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Old 11-14-2012, 05:18 AM
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I use the balancer bolt regularly on my Ford engines, but they are 5/8-18 not a Chebbies 7/16-20 plus I use an ARP 200,000 psi replacement. But with that said, I'll always pull the spark plugs too instead of trying to force the turnover past compression.

Of course, the best is still a special socket
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Old 11-14-2012, 06:08 AM
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Your Ford is the same size thread as the Pontiac uses. 160 ft/lb torque on the Pontiac, though.
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Old 11-14-2012, 06:35 AM
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Quote:
Originally Posted by cobalt327 View Post
Your Ford is the same size thread as the Pontiac uses. 160 ft/lb torque on the Pontiac, though.
OUCH!!

Ford torque is 90 lb ft (actually 70-90) which is not much for a 5/8" bolt. I generally split it to 80, but after using it for turning over the engine - who knows, but it is still probably no more then the 'official' torque range with plugs pulled.

Dave W
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Old 11-14-2012, 07:52 AM
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Should take no more than 30 to 50 ft lbs to turn your engine over fully assembled. Takes 40 on mine. Sure you could apply more but be carefule.
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