Cranking a motor on the stand? - Team Camaro Tech
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post #1 of 10 (permalink) Old Jan 11th, 09, 03:30 PM Thread Starter
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Travis
 
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Cranking a motor on the stand?

My friend has a 427 sitting on a stand and wants to crank it over to do a compresssion test. Doesnt want to fire it, just crank it over. He has the main positive batery terminal ran to the starter solenoid and the negative side of the battery ground to the block. What else does he need to do? Do you need a coil hooked up some how?

Thanks!

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post #2 of 10 (permalink) Old Jan 11th, 09, 04:01 PM
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Re: Cranking a motor on the stand?

Is this a brand new rebuild or a used engine? Either way I gotta wonder why he needs to do a compression test on a stand?

He definitely doesn't need a coil...or any spark plugs in to do it right, just some power to the solenoid to engage the starter.

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post #3 of 10 (permalink) Old Jan 11th, 09, 04:05 PM
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Re: Cranking a motor on the stand?

jump to the "S" terminal on the solenoid to crank it. That's about it. Or feed power to the coil, hook up a fuel line to the carb and annoy the neighbors... As Dave said no sparkplugs. To get an accurate compression reading you need a fully charged battery, all plugs removed & hold the carb wide open to let the air flow through.
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post #4 of 10 (permalink) Old Jan 11th, 09, 04:13 PM
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Re: Cranking a motor on the stand?

I've cranked a few motors on hoists and stands it's easy. Since the battery is already hooked up (positive to starter solinoid terminal and Neg. to block), get a long screw driver and jump the positive terminal on the starter solinoid to the smaller 's' terminal about an inch away from it. Just be a little carfull when you do it, watch those fingers too!

*EDIT* NHbandit beat me to it.

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post #5 of 10 (permalink) Old Jan 11th, 09, 04:34 PM Thread Starter
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Re: Cranking a motor on the stand?

OK, I guess I need to be a little more specific. After reading some of the replys, maybe he cant do this.
He bought the motor froma guy and never heard it run. He just wants to check the compression to see if its in specs. Also it has no intake cam or lifters, can he still do a compression test without these?

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post #6 of 10 (permalink) Old Jan 11th, 09, 04:37 PM
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Re: Cranking a motor on the stand?

no
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post #7 of 10 (permalink) Old Jan 11th, 09, 05:07 PM
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Re: Cranking a motor on the stand?

If the motor is new, never been run, you probably don't have the full benefits of rings being sealed, so I would suggest running a leak down. Be safer. I have seen a few guys crank the motor and run it on a typical stand, but I would make sure I have some way to lock the motor down to keep from spinning or torquing over. Can you imagine a running motor spinning on an engine stand?

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post #8 of 10 (permalink) Old Jan 11th, 09, 05:14 PM Thread Starter
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Re: Cranking a motor on the stand?

Quote:
Originally Posted by zdld17 View Post
If the motor is new, never been run, you probably don't have the full benefits of rings being sealed, so I would suggest running a leak down. Be safer. I have seen a few guys crank the motor and run it on a typical stand, but I would make sure I have some way to lock the motor down to keep from spinning or torquing over. Can you imagine a running motor spinning on an engine stand?
It is a used engine and it wont run, has no intake, cam or lifters /pushrods

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post #9 of 10 (permalink) Old Jan 11th, 09, 05:21 PM
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Re: Cranking a motor on the stand?

Quote:
Originally Posted by blackl78 View Post
It is a used engine and it wont run, has no intake, cam or lifters /pushrods

Thanks!
Can't do a compression test with no cam, lifters, pushrods.. No way to get air in or out. I would bet it turns over pretty damn hard by hand even with all the valves closed unless the plugs are out of it.
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post #10 of 10 (permalink) Old Jan 11th, 09, 06:44 PM Thread Starter
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Re: Cranking a motor on the stand?

Thanks guys, this has helped a bunch! And I just hit 500 posts WOOOHOOO!!

Travis

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