Previous Thread
Next Thread
Print Thread
Crank endplay? #3080172
09/24/22 03:52 AM
09/24/22 03:52 AM
Joined: Dec 2006
Posts: 4,593
aotearoa
rebel Online content OP
master
rebel  Online Content OP
master

Joined: Dec 2006
Posts: 4,593
aotearoa
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 08:37 AM
09/24/22 08:37 AM
Joined: Jan 2003
Posts: 16,790
Western NC
440Jim Offline
I Live Here
440Jim  Offline
I Live Here

Joined: Jan 2003
Posts: 16,790
Western NC
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, 1973 Cuda 440, 2009 Challenger 5.7 Hemi, 2015 RAM 1500 5.7 Hemi 8-speed auto, Link to 572 B1 - Part 1
Re: Crank endplay? [Re: 440Jim] #3080208
09/24/22 09:14 AM
09/24/22 09:14 AM
Joined: Aug 2003
Posts: 4,465
On the parachute mount
N
n20mstr Offline
master
n20mstr  Offline
master
N

Joined: Aug 2003
Posts: 4,465
On the parachute mount
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 09:37 AM
09/24/22 09:37 AM
Joined: Jun 2004
Posts: 849
B
birdtracker Offline
super stock
birdtracker  Offline
super stock
B

Joined: Jun 2004
Posts: 849
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 02:17 PM
09/24/22 02:17 PM
Joined: Aug 2003
Posts: 40,855
Bend,OR USA
C
Cab_Burge Offline
I Win
Cab_Burge  Offline
I Win
C

Joined: Aug 2003
Posts: 40,855
Bend,OR USA
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 02:20 PM.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Crank endplay? [Re: Cab_Burge] #3080315
09/24/22 04:37 PM
09/24/22 04:37 PM
Joined: Dec 2006
Posts: 4,593
aotearoa
rebel Online content OP
master
rebel  Online Content OP
master

Joined: Dec 2006
Posts: 4,593
aotearoa
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 10:02 PM
09/24/22 10:02 PM
Joined: Aug 2003
Posts: 40,855
Bend,OR USA
C
Cab_Burge Offline
I Win
Cab_Burge  Offline
I Win
C

Joined: Aug 2003
Posts: 40,855
Bend,OR USA
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 10:04 PM.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Crank endplay? [Re: Cab_Burge] #3080576
09/25/22 03:53 PM
09/25/22 03:53 PM
Joined: Oct 2006
Posts: 1,192
New York, USA
Chargerfan68 Offline
super stock
Chargerfan68  Offline
super stock

Joined: Oct 2006
Posts: 1,192
New York, USA
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 04:55 PM
09/25/22 04:55 PM
Joined: Jan 2012
Posts: 2,285
Stuttgart, Arkansas
rickseeman Offline
top fuel
rickseeman  Offline
top fuel

Joined: Jan 2012
Posts: 2,285
Stuttgart, Arkansas
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 09:15 AM
09/30/22 09:15 AM
Joined: Jan 2003
Posts: 3,584
Shelby Twp. Mi
HardcoreB Offline
master
HardcoreB  Offline
master

Joined: Jan 2003
Posts: 3,584
Shelby Twp. Mi
.003" seems tight to me but I've not done an aluminium block yet.

Re: Crank endplay? [Re: HardcoreB] #3081957
09/30/22 10:25 AM
09/30/22 10:25 AM
Joined: Feb 2003
Posts: 2,539
S.E. Michigan
cl440 Offline
master
cl440  Offline
master

Joined: Feb 2003
Posts: 2,539
S.E. Michigan
We have ran them as tight as .006 and as loose as .010 with no issues. Aluminum block 540







Powered by UBB.threads™ PHP Forum Software 7.7.1