Crankshaft worry , now unsure of what to do with rod caps ?? - 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 06-11-2012, 10:11 PM
Registered User
 
Join Date: Jun 2012
Posts: 50
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Crankshaft worry , now unsure of what to do with rod caps ??

Bought a used engine , guy said 383 bla bla bla so I took a gamble and when I got home tore it apart , everything was looking 100% until I dropped the pan and saw some color on the crank , so i pulled the rod cap to make sure it was fine and bearings and crank grind look perfect no wear or color , looks like at one time it spun a bearing so they ground the crank and re used it , crank is an eagle , pistons are probe flat top's and rods are unknown , I don't know what to do now ? Loosen all rods are re torque ? seen 45lbs with oil and 50lbs with lock tight ? bolts are 3/8 24 fine I believe
Attached Thumbnails
Click image for larger version

Name:	crank color.JPG
Views:	106
Size:	124.5 KB
ID:	65998   Click image for larger version

Name:	bearing cap.JPG
Views:	91
Size:	133.7 KB
ID:	65999   Click image for larger version

Name:	crank bearing shot.JPG
Views:	104
Size:	108.3 KB
ID:	66000  

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 06-11-2012, 10:33 PM
S10 Racer's Avatar
http://www.warsprints.com
 

Last journal entry: W.A.R. (Wingless Auto Racing) Sprint Car Racing
Last photo:
Join Date: Nov 2007
Location: At The Dirt Tracks
Age: 55
Posts: 1,860
Wiki Edits: 0

Thanks: 3
Thanked 57 Times in 52 Posts
Quote:
Originally Posted by jumbo2
Bought a used engine , guy said 383 bla bla bla so I took a gamble and when I got home tore it apart , everything was looking 100% until I dropped the pan and saw some color on the crank , so i pulled the rod cap to make sure it was fine and bearings and crank grind look perfect no wear or color , looks like at one time it spun a bearing so they ground the crank and re used it , crank is an eagle , pistons are probe flat top's and rods are unknown , I don't know what to do now ? Loosen all rods are re torque ? seen 45lbs with oil and 50lbs with lock tight ? bolts are 3/8 24 fine I believe
If the crank has been reground, it should be designated on a counterweight. The main & rod bearings will also be designated on the back side. Because you don't know the history of the motor, if you are going to keep it, I would take the crank to a machine shop and have them mic the journals unless you can do it yourself. If the journals spec out ok, just have the machine shop polish it, then install new bearings. The discoloration is really no concern as long as everything checks out. The rods should be removed, checked and manicured as well. It makes no sense to have a perfectly round crank if the rods aren't.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 06-11-2012, 10:54 PM
Registered User
 
Join Date: Jun 2012
Posts: 50
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Because everything looks so good I was going to re torque the rods and run it , there is no way the crank would be colored and the bearings and rods be fine , im just unsure of what to do ? back all caps off and re torque all of them to ? ft lbs
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 06-12-2012, 05:10 AM
engineczar's Avatar
Hotrodders.com Moderator
 
Last photo:
Join Date: Sep 2002
Location: In Flowbench nirvana
Age: 52
Posts: 1,629
Wiki Edits: 0

Thanks: 5
Thanked 42 Times in 39 Posts
Can you tell if the rod bolts are aftermarket? You might need a mirror to see the head side of the bolt. If we can determine what the bolts are then we can figure out a torque spec.
__________________
BSE Racing Engines
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 06-12-2012, 08:09 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 597 Times in 546 Posts
Quote:
Originally Posted by jumbo2
I don't know what to do now ? Loosen all rods are re torque ? seen 45lbs with oil and 50lbs with lock tight ?
Rods look like OEM powdered metal and the bolts look stock, judging by the details that can be seen, including no balancing pad on the cap, and similarities to the photos below.

IF you choose to reuse the rods as-is, I would retorque to stock specs. The reason is the bolts are knurled (not Waveloc), and the visible end does not have a dimple used to locate a stretch gauge. There are still knurled aftermarket rod bolts, and there may be knurled aftermarket rod bolts w/o a dimple for a stretch gauge, but my guess is those are stock.

But if it was me, I would have to give some hard thought to pulling the rods and having ARP bolts installed, unless the cam/redline/ how the engine will be used is such that the stock rods and bolts are deemed to be enough.




Note dimple


PM rod on right.
Note how the profile around the bolt on the rod and cap is smooth. You can compare this to yours.


Side view, PM on right.


Other side.

Last edited by cobalt327; 06-12-2012 at 08:38 AM.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 06-12-2012, 01:31 PM
Registered User
 
Join Date: Jun 2012
Posts: 50
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Rod bolts have what looks like a capital I on the head , it's the out line of the I
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 06-12-2012, 10:26 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 597 Times in 546 Posts
Quote:
Originally Posted by jumbo2
Rod bolts have what looks like a capital I on the head , it's the out line of the I
'96- up Vortec type OEM rods and bolts. I have an identical set out of a '97 5.7L Vortec L31 engine out in my shop.

Are you sure the pistons are forged? Are they stamped w/a part number and/or an oversize ID on the tops?
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 06-13-2012, 10:59 PM
Registered User
 
Join Date: Jun 2012
Posts: 50
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
so Yes they are 98 vortec rods , motor was a vortec and has had probe flat tops and eagle crank installed , only thing I could find was 15ft lbs then 70 deg on the rod bolts ?

Talked to eagle crank is fine to run
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 06-13-2012, 11:01 PM
Registered User
 
Join Date: Jun 2012
Posts: 50
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by cobalt327
Rods look like OEM powdered metal and the bolts look stock, judging by the details that can be seen, including no balancing pad on the cap, and similarities to the photos below.

IF you choose to reuse the rods as-is, I would retorque to stock specs. The reason is the bolts are knurled (not Waveloc), and the visible end does not have a dimple used to locate a stretch gauge. There are still knurled aftermarket rod bolts, and there may be knurled aftermarket rod bolts w/o a dimple for a stretch gauge, but my guess is those are stock.

But if it was me, I would have to give some hard thought to pulling the rods and having ARP bolts installed, unless the cam/redline/ how the engine will be used is such that the stock rods and bolts are deemed to be enough.




Note dimple


PM rod on right.
Note how the profile around the bolt on the rod and cap is smooth. You can compare this to yours.


Side view, PM on right.


Other side.
those are the rods on the right midle picture , block was a 98 cortec so it makes sense , cant find details on the torque specs
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 06-14-2012, 06:25 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 597 Times in 546 Posts
Engines I've done w/those same rods and bolts got 45 ft/lbs. Just like any other SBC w/stock 3/8" rod bolts.

You can use the 15 ft/lbs plus 70 degrees if you have access to the tool that shows degrees, I got mine at NAPA. It is kind of bulky so you may need an extension so it clears everything. The final choice is yours as to which method you use.
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 06-14-2012, 09:13 PM
GRIdLOCK's Avatar
project pegasus{(([cloaked]))}
 
Last photo:
Join Date: Nov 2010
Location: BronX
Posts: 27
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
+1 on the ARP Bolts
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 06-18-2012, 11:55 PM
Registered User
 
Join Date: Jun 2012
Posts: 50
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by cobalt327
Engines I've done w/those same rods and bolts got 45 ft/lbs. Just like any other SBC w/stock 3/8" rod bolts.

You can use the 15 ft/lbs plus 70 degrees if you have access to the tool that shows degrees, I got mine at NAPA. It is kind of bulky so you may need an extension so it clears everything. The final choice is yours as to which method you use.
so I just loosen all rod bolts , then retorque all 8 to 45 ft lbs in any order and make sure there is lots of oil or just wet ? I need to do this and get motor back togther asap
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 06-19-2012, 12:17 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 597 Times in 546 Posts
Quote:
Originally Posted by jumbo2
so I just loosen all rod bolts , then retorque all 8 to 45 ft lbs in any order and make sure there is lots of oil or just wet ? I need to do this and get motor back togther asap
Motor oil on the rod bolt threads and bearing assembly lube on the bearings and journals (or motor oil).Tighten the rods in at least two steps and rotate the crank after each cap is torqued to assure there is nothing binding.

I don't know how much you wanted to inspect and measure, but you can plastigage the rod and mains for oil clearance as well as check the crank end float and rod side play before the pan goes on.
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 06-19-2012, 10:12 AM
Registered User
 
Join Date: Jun 2012
Posts: 50
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
It was a running motor so I don't think I need to worry too much , thanks for all your help :-)
Reply With Quote Quick reply to this message
  #15 (permalink)  
Old 06-19-2012, 02:38 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 597 Times in 546 Posts
Quote:
Originally Posted by jumbo2
It was a running motor so I don't think I need to worry too much , thanks for all your help :-)
Any time, jumbo2. Keeping us posted is thanks enough.
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:
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
Rod main caps on backwards... what now? ForceFed86 Engine 12 06-19-2010 12:01 PM
got an 84 riviera i am unsure what to do with. fast68 Hotrodders' Lounge 10 04-01-2009 11:01 PM
Eagle rod caps denno5644 Engine 8 04-29-2004 08:11 PM
Rod Caps GearHead69 Engine 3 08-04-2003 09:38 PM
SBChevy Rod Caps appear mixed up 360Camaro Engine 1 08-04-2003 07:46 PM


All times are GMT -6. The time now is 07:33 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.