R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Nitro Off-Road

Reply
 
Thread Tools Search this Thread
Old 09-08-2010, 12:22 PM   #1
Tech Regular
 
Join Date: Oct 2009
Posts: 316
Trader Rating: 3 (100%+)
Default Crankshaft "play"

When swapping clutch parts on my engine the other day I noticed there is about 1mm of in-and-out play on my JPX. Is this normal? I don't remember it doing this the last time but to be honest I'm not sure I would anyways. It is not side to side play, as I know that would mean the bearing is gone, in this case the crank actually moves in and out of the front bearing approx. 1mm. What does this mean? Motor still has great compression and runs like a champ otherwise so maybe I'm just being paranoid.
C.Harper is offline   Reply With Quote
Old 09-08-2010, 12:30 PM   #2
Tech Elite
 
JFuel11's Avatar
 
Join Date: Oct 2009
Location: Central IL
Posts: 3,583
Trader Rating: 152 (100%+)
Default

Hello,

Was this with the flywheel removed? It is very common for most engines to have about 1mm or so play when the flywheel has been removed.

When you tighten down the flywheel nut it pulls the crank tight up against the bearings as well.

Hope this helps...
__________________
Alan Bachman (AKA - Johnny Rocket Fuel)
Help your fellow racers go faster... You will have more competition!!!
Sponsors:
RC America - XRay - Hudy - Maclan Racing - Xpert Servos - Schelle Racing Innovations - AKA Racing Products - DE Racing - Sticky Kicks - Sanwa
JFuel11 is offline   Reply With Quote
Old 09-08-2010, 12:33 PM   #3
Tech Regular
 
smracer31's Avatar
 
Join Date: Nov 2004
Location: Wisconsin
Posts: 425
Trader Rating: 6 (100%+)
Send a message via AIM to smracer31
Default

Quote:
Originally Posted by JFuel11 View Post

When you tighten down the flywheel nut it pulls the crank tight up against the bearings as well.

Hope this helps...
sometimes it doesn't pull it forward, you should make it a habit of pulling the crank forward, then sliding the collar on, and make sure theres no play, then tighten the nut.
smracer31 is offline   Reply With Quote
Old 09-08-2010, 12:45 PM   #4
Tech Champion
 
JAMMINKRAZY's Avatar
 
Join Date: Jun 2007
Location: Pittsburgh PA
Posts: 6,575
Trader Rating: 17 (100%+)
Default

Quote:
Originally Posted by smracer31 View Post
sometimes it doesn't pull it forward, you should make it a habit of pulling the crank forward, then sliding the collar on, and make sure theres no play, then tighten the nut.
X2
__________________
-Koby Kubrin-
Thanks to my Sponsors:
Serpent America | Team Novarossi | Desoto Racing | Race AKA | Ridgeway Bodies
JAMMINKRAZY is offline   Reply With Quote
Old 09-08-2010, 01:31 PM   #5
Tech Regular
 
Join Date: Oct 2009
Posts: 316
Trader Rating: 3 (100%+)
Default

Ok excellent because that is exactly what I did, pull the crank forward and then tighten everything down. I just honestly did not remember that play before and had no idea what it meant. Glad to hear it is not uncommon! Thanks fellas!
C.Harper is offline   Reply With Quote
Reply



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 08:52 AM.


Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net