Excessive main journal wear? - 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 07-22-2010, 11:09 PM
Member
 
Last photo:
Join Date: Aug 2002
Location: Alabama
Posts: 632
Wiki Edits: 0

Thanks: 0
Thanked 8 Times in 7 Posts
Excessive main journal wear?

I just recently rebuilt a 232 6 cylinder engine out of a 73 Javelin. I changed the oil and filter every 4000 miles and never ran the engine hard. The engine had about 125,000 miles on it when I took it out of the car. I used standard 10w40 oil.

When I took the engine apart everything looked good except the crankshaft. The front and rear journals and bearings looked real good but the main journals and bearings toward the center of the crankshaft were worn so bad the crankshaft had to be replaced. The rod bearings and cam bearings looked good.

Does anyone have an explanation as to why the main journals and bearings toward the center of the crankshaft were the only area of major wear in the whole engine?

Do you think switching to synthetic oil and a higher quality filter would prevent this from happening in the future?

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 07-23-2010, 01:18 AM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 60
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 598 Times in 547 Posts
The 232 you had is a seven main bearing engine, and has a good reputation as far as durability goes. If the crank was ground off center on the journals that were damaged, that could account for it. Possibly an imbalance of some sort could have set up harmonics that might have caused some kind of wear problems- but that is admittedly a long shot. Otherwise, given the use and maintenance it was given, I cannot come up w/any other reasonable explanation.

There are some real sharp Rambler/AMC guys here, hopefully one or more will have a comment that will be of some use to you.

Was the crank salvageable or did you just replace it outright?
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 07-23-2010, 09:17 PM
Member
 
Last photo:
Join Date: Aug 2002
Location: Alabama
Posts: 632
Wiki Edits: 0

Thanks: 0
Thanked 8 Times in 7 Posts
Cranckshaft was replaced with another unit

The machine shop replaced the crankshaft with another unit, and ground it .010. I think they made the correct decision because it looked really bad.
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
Synthetic oil?? Mightymouse Engine 40 02-23-2012 05:05 PM
Journal Indexes PSST Hotrodders Site Suggestions and Help 8 01-27-2009 10:27 PM
327 Small journal 4 bolt main sampanjohn Engine 2 08-11-2007 10:28 AM
crank journal wear specs on 305 engine fast68 Engine 4 02-25-2007 08:34 PM
Building A 302 Chevy Scorpio Shaping Flow Hotrodding Basics 6 01-16-2007 06:55 AM


All times are GMT -6. The time now is 08:35 PM.


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.