cracked crankshaft? - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 02-23-2009, 09:57 PM
gto_ron's Avatar
Registered User
 
Last photo:
Join Date: Jul 2005
Location: SW Ohio
Posts: 141
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
cracked crankshaft?

My local machine shop called today and said my crankshaft(389 Pontiac) was cracked. I realize a crack is undesirable but is the crankshaft junk? Are cracks that common in cranks?

thanks for any and all responses

Ron

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 02-23-2009, 10:16 PM
ericnova72's Avatar
More for Less Racer
 
Join Date: Jan 2007
Location: S.W. Lower Michigan
Age: 47
Posts: 9,644
Wiki Edits: 0

Thanks: 42
Thanked 543 Times in 492 Posts
Yep, it is junk, it's just about the worst piece to have a crack in it. Connecting rod crack would be about the worst. Yes, it is a common piece to find cracks in, and be glad you found it now and not at 5500 rpm.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 02-23-2009, 10:23 PM
kleen56's Avatar
Registered User
 
Last photo:
Join Date: Oct 2006
Location: Santa Clarita CA
Posts: 802
Wiki Edits: 0

Thanks: 4
Thanked 6 Times in 6 Posts
Its not that common but it does occur. Mostly, what is called heat cracks. Either the engine was lacking lubrication to the crank and bearing or it ran hard and overheated the metal causing cracks to the surface. Unfortunately you need to replace the crank with a good one.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 02-23-2009, 11:22 PM
WDCreech's Avatar
Grumpy Old Goat Herder
 
Last photo:
Join Date: Apr 2006
Location: Anchorage, Alaska
Age: 71
Posts: 1,331
Wiki Edits: 0

Thanks: 3
Thanked 35 Times in 33 Posts
With the price of good cranks, for Pontiacs, out there, You should be able to get a good casting for under $300, or a forged one for about $500. I recently bought a 4.25" stroke, 3" main Scat forged unit, for $500, new.

Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




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

Posting Rules
You may post new threads
You may 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 On


Similar Threads
Thread Thread Starter Forum Replies Last Post
The Crankshaft Sensor! 1988ChevyBeretta2.8 Engine 7 03-15-2007 07:05 PM
302 ford crankshaft oil slinger dave4943 Engine 2 11-20-2006 08:52 PM
Announcing the Crankshaft Coalition Jon Hotrodders' Lounge 8 08-14-2005 06:56 PM
Cracked Head or Blown Gasket? '71 rag top Engine 1 12-15-2004 11:08 PM


All times are GMT -6. The time now is 03:56 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.