no play connecting rod 1 side only - Page 3 - 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
  #31 (permalink)  
Old 07-25-2013, 09:43 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: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 595 Times in 545 Posts
Quote:
Originally Posted by Woodsman View Post
I had meant the possibility of an outside step. One that would wear against the adjacent outside of rod & cap.
As for the purchase of a new rod, I'd have ordered direct from eagle with it weighted to match, but you are winning me over with the resizing deal, because I somewhat expect the shop would check the outside too.
By the way, cobalt, you are a great help...... thank you very much for chatting on this thread!
My pleasure. We all do what we can...

My thoughts are, as long as the rod side clearance is within spec when measured at both the rod and the cap, even if there's a slight mismatch to the side surfaces you'd still be fine. The thrust surfaces are not contacting each other or the crank w/much pressure and there's a lot of lubrication available. But seeing as how you're all OCD about clearances (which is a good thing IMO), the RIGHT way to do this (short of buying a new rod) would be to resize the ID then machine the sides to be flat and parallel to one another. But the resulting side clearance needs to be taken into account; if the mismatch is too great, machining could put the side clearance out of spec considering both the rod and cap would have material removed from one side making the width of the big end narrower by the combined amounts that needed to be removed.

The following is my opinion:
Within reason, rod side clearance is not as critical as one might first think. While you don't want it to be excessive, the idea that you'll suddenly have low oil pressure or oil windage problems because the side clearance is 0.005" too wide just doesn't hold water in the real world. It's the bearing oil clearance that controls pressure/windage, not side clearance per se.

Basically as long as the oil hole in the crank is covered by the bearings and the small end of the rod isn't contacting the piston rod bosses, you're OK.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #32 (permalink)  
Old 07-25-2013, 05:17 PM
Woodsman's Avatar
Registered User
 
Join Date: Jul 2013
Posts: 16
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
I conferr with you on this. This solution is definatly logical and otherly well considered.
I measured this oil clearance just now.
It goes something like this: >
Towards the front of the cap, it is tighter. .001 or so. Toward the rear, its .0015 to .002
There is slight wear from turning by hand on the cap where it hits the .001 mark.
It MAY go tighter by about .0001 or .0002 or the vicinity of those ten hundred thousandths.
Does this mean no go?
Not 100% myself, but I may just order a new rod.
It would cost around 55 from eagle balanced and shipped, then maybe something like 20 or so to press out old, install new.
I'm not certain the peace of mind outweighs that cost.
The side clearance and perceived to be possible "step" is completely gone now, by the way.
Both halves measured exactly the same width/thickness.
The moniker "woodsman" comes from the depth of woods I am living in.
Machinists equipment is old and tired here.
There is one who has equipment young and able enough to do a good resize, but for your aforementioned concerns on that process.
I'm tired and stumped. Need more awake than I got right now.
Get back at you all later.
Reply With Quote Quick reply to this message
  #33 (permalink)  
Old 07-25-2013, 05:33 PM
Woodsman's Avatar
Registered User
 
Join Date: Jul 2013
Posts: 16
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
There are pictures of this in my profile in my only album. I cannot for the life of me figure out how to post the image directly here.
Reply With Quote Quick reply to this message
  #34 (permalink)  
Old 07-25-2013, 06:56 PM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 595 Times in 545 Posts


0.001" is not enough clearance and that's also too much taper IMO. I'm sure you've checked for debris under the bearing, right? If not for the taper, using a -0.001-inch oversize rod bearing would put the clearance at 0.002" if it was nominally 0.001". (There are other sizes that can be used and you can also fine tune clearances by using only one bearing shell that is either plus or minus a half or one thousandths, w/a standard shell.) You need to determine if the taper lies with the rod journal or the rod itself. Likely/hopefully it's the rod.

Again, resizing the rod will rectify this.

Oh, and there's info on posting photos and videos at the top of each forum.
Reply With Quote Quick reply to this message
  #35 (permalink)  
Old 08-05-2013, 06:59 PM
Woodsman's Avatar
Registered User
 
Join Date: Jul 2013
Posts: 16
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
I was away for a time. Sorry for the delay.
The issue was with the rod and cap, not the journal.
I called Eagle and they shipped a new rod "toot sweet". Very good customer service there.
Had the old rod pressed out and new rod pressed in.
Installed it, and viola!
The bottom end is done!
Side clearances from front to rear: (measured with feeler gauge on both sides of rod end assembly.
.0195 both sides (frontmost position.)
.019 both sides
.021 both sides
.020 both sides (rearmost position.)
Oil clearance all throughout is .0015 to .002 (This goes for both main journals and rod journals.

Thank you all again for everything.
I'd have been in a FAR worse spot without your help and advice.
- WOODSMAN -
Reply With Quote Quick reply to this message
  #36 (permalink)  
Old 08-05-2013, 07:45 PM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 595 Times in 545 Posts
Glad you finally have it figgered out. And thanks for letting us know the outcome! All too often that gets left out.
Reply With Quote Quick reply to this message

Tags
connecting rod, no side play, side play, stuck connecting rod

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:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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
Tailshaft side play for a TH 350 sstock Transmission - Rearend 2 06-03-2012 01:13 PM
Connecting Rod Help Chevyjeepster Engine 17 12-08-2011 05:07 PM
connecting rod side clearance bill plise Engine 2 06-04-2011 07:20 AM
connecting rod question BBCMudbogger Engine 2 02-26-2006 10:56 AM
Connecting rod side clearence ???? ktorr22 Engine 8 08-16-2004 07:20 PM


All times are GMT -6. The time now is 08:24 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.