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Crank endplay? #3080172
09/24/22 04:52 AM
09/24/22 04:52 AM
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aotearoa
rebel Offline OP
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How much crank end play would you want with an alloy block at room temp 20*C. I have a new crank & using King Main bearings I have 0.003 clearance. Crank spins nice with mains torqued up but is this enough end play for aluminium?

Re: Crank endplay? [Re: rebel] #3080197
09/24/22 09:37 AM
09/24/22 09:37 AM
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440Jim Offline
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The manual I have says the factory spec was 0.002" - 0.007", with 0.010" maximum.
My aluminum block has 0.005" with no issues.
Good question on yours, but I don't have experience that tight with an aluminum block. But my feeling is you are OK, let's see if anyone posts experience.


1993 Daytona, 5.50 at 130mph (1/8) 1.19 sixty ft (PG). Link to 572 B1 - Part 1
Re: Crank endplay? [Re: 440Jim] #3080208
09/24/22 10:14 AM
09/24/22 10:14 AM
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On the parachute mount
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n20mstr Offline
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I have always ran .007 - .0010 . What block is it ? My Indy block the crank was hitting one of the caps and it needed a little touch up on the mill to allow the crank to float as it should . Check all the caps for clearance also


....BAD A$$ STREET CAR.....
Re: Crank endplay? [Re: n20mstr] #3080217
09/24/22 10:37 AM
09/24/22 10:37 AM
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I agree with checking to make sure the crank isn't touching. Also I take a rubber mallet and seat everything both front and rear of crankshaft. Aluminum block is going to grow so you should be good. Birdtracker

Re: Crank endplay? [Re: rebel] #3080287
09/24/22 03:17 PM
09/24/22 03:17 PM
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Bend,OR USA
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try loosening up the center main cap bolts, all of them, and then try whacking both ends of the crank with a big soft mallet and see if that will help centers that cap and give you a tiny bit more clearance wrench hammer scope up
I've had to do that more than once on many different motors shruggy
I shoot for .0040 to .010 end play using a dial indicator on the snout end of the cranks using a large handle screwdriver to pry the counterweights back and forth wrenchscope
Get it correct and go forward with having fun without worries on it up twocents

Last edited by Cab_Burge; 09/24/22 03:20 PM.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Crank endplay? [Re: Cab_Burge] #3080315
09/24/22 05:37 PM
09/24/22 05:37 PM
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aotearoa
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It is an Indy Maxx block, with a Molnar crank. I did seat everything with a rubber mallet as we torqued up the main caps as was suggested & it does spin really nice, but I just wasn't sure whether 0.003 was enough, but someone suggested that being aluminum, it might grow when hot. I was just hoping someone could confirm I was good to go.

Re: Crank endplay? [Re: rebel] #3080391
09/24/22 11:02 PM
09/24/22 11:02 PM
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You might want to try adding a little more clearances, .0015 to .0020 on both the front and back sides of the thrust bearing by sanding it on some medium grit sandpaper on a really flat surface, measure carefully while doing that scope
Drag race motor live a lot longer with looser rotating clearances than they do with them a tiny bit to tight work twocents

Last edited by Cab_Burge; 09/24/22 11:04 PM.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Crank endplay? [Re: Cab_Burge] #3080576
09/25/22 04:53 PM
09/25/22 04:53 PM
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New York, USA
Chargerfan68 Offline
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Originally Posted by Cab_Burge
You might want to try adding a little more clearances, .0015 to .0020 on both the front and back sides of the thrust bearing by sanding it on some medium grit sandpaper on a really flat surface, measure carefully while doing that scope
Drag race motor live a lot longer with looser rotating clearances than they do with them a tiny bit to tight work twocents


I agree with Cab…..and if you do this, place the bearings together (same orientation as when installed) when clearancing them on flat surface , to keep them square. As opposed to sanding each half separately.


1.50 60Ft. , 10.75@ 127MPH Hauling 3900 LBS.
Re: Crank endplay? [Re: Chargerfan68] #3080594
09/25/22 05:55 PM
09/25/22 05:55 PM
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Stuttgart, Arkansas
rickseeman Offline
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Forgive me if I'm mistaken, but aren't you supposed to take it off the front side? I agree with an alloy block needing another thou or 2 because of the aluminum growth.


2011 Drag Pak Challenger
Re: Crank endplay? [Re: rickseeman] #3081932
09/30/22 10:15 AM
09/30/22 10:15 AM
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HardcoreB Offline
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.003" seems tight to me but I've not done an aluminium block yet.

Re: Crank endplay? [Re: HardcoreB] #3081957
09/30/22 11:25 AM
09/30/22 11:25 AM
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S.E. Michigan
cl440 Offline
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We have ran them as tight as .006 and as loose as .010 with no issues. Aluminum block 540







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