6066 (1960-1966) GMC Truck Club Bitcoin now accepted here! 
Pay Dues
Pay Dues or become a Site Supporter
 



Go Back   6066 (1960-1966) GMC Truck Club > 6066 GMC Truck Club Forum > GMC V6 and V12 Engines


GMC V6 and V12 Engines Engine repair and rebuilding

Reply
 
Thread Tools
  #1  
Old June 9th, 2015, 05:21 PM
abus319 abus319 is offline
-= Site Supporter =-
 
Join Date: Sep 2013
Location: Austin Texas
Truck: 1960 3500, 305D heads
Posts: 116
Rep Power: 95
abus319 is on a distinguished road
Default flywheel part number

My parts book is a 1960 and doesn't include many of the later engines. I need an application for a flywheel # 2423465. Its an 8 bolt, and fits the 478 crank.
Thanks
Howard
Reply With Quote
  #2  
Old June 9th, 2015, 07:22 PM
bigblockv6 bigblockv6 is offline
Senior Member
 
Join Date: Jan 2013
Location: Rohnert Park, ca.
Truck: 1968 KM2500
Posts: 1,325
Rep Power: 415
bigblockv6 will become famous soon enoughbigblockv6 will become famous soon enough
Default Re: flywheel part number

What year is your 478? I do have a 62 parts book as well as a couple from the 70's so I may be able to see what that part number matches up to but it won't be till Thursday mid afternoon, I'm out of town till then.
Reply With Quote
  #3  
Old June 10th, 2015, 02:44 PM
abus319 abus319 is offline
-= Site Supporter =-
 
Join Date: Sep 2013
Location: Austin Texas
Truck: 1960 3500, 305D heads
Posts: 116
Rep Power: 95
abus319 is on a distinguished road
Default Re: flywheel part number

Hi Pete
The serial is 478M0004.
I don't know the year but it has the M designator which makes it a 66 or later. The 004 is a pretty low sequence number, so Im guessing it is a 66.
The flywheel was a loose "find" in a treasure pile.
Howard
Reply With Quote
  #4  
Old June 14th, 2015, 07:27 PM
abus319 abus319 is offline
-= Site Supporter =-
 
Join Date: Sep 2013
Location: Austin Texas
Truck: 1960 3500, 305D heads
Posts: 116
Rep Power: 95
abus319 is on a distinguished road
Default Re: flywheel part number

I guess the real question is how to tell if a flywheel is internally or externally balanced. This one doesn't have any bulges or added mass, but has extensive drilling on one side.
Reply With Quote
  #5  
Old June 14th, 2015, 08:02 PM
bigblockv6 bigblockv6 is offline
Senior Member
 
Join Date: Jan 2013
Location: Rohnert Park, ca.
Truck: 1968 KM2500
Posts: 1,325
Rep Power: 415
bigblockv6 will become famous soon enoughbigblockv6 will become famous soon enough
Default Re: flywheel part number

On the side facing the crankshaft there will usually be a slight bulge and the rest of the surface is cast or machined lower and there can be some partial holes drilled. Majority of the 8 bolt flywheels from a V6 will be like this other than the 401 since it's internally balanced.
Reply With Quote
  #6  
Old June 14th, 2015, 10:09 PM
abus319 abus319 is offline
-= Site Supporter =-
 
Join Date: Sep 2013
Location: Austin Texas
Truck: 1960 3500, 305D heads
Posts: 116
Rep Power: 95
abus319 is on a distinguished road
Default Re: flywheel part number

Thanks Pete
Thats mostly what I needed to know. This one must be a 401.
Reply With Quote
  #7  
Old June 17th, 2015, 04:13 PM
abus319 abus319 is offline
-= Site Supporter =-
 
Join Date: Sep 2013
Location: Austin Texas
Truck: 1960 3500, 305D heads
Posts: 116
Rep Power: 95
abus319 is on a distinguished road
Default Re: flywheel part number

Ok maybe not... Sometimes, its amazing the things that I miss.
It did have small bumpouts in the casting. It was a bit hard to see until I marked the edges with soapstone. So it appears that it is externally balanced.
Unfortunately the starter ring gear teeth are far too closely spaced and doesn't match my starter teeth. I guess I need to go to starter school as well...
Attached Images
File Type: jpg IMG_0416.jpg (1.77 MB, Multiple views, 5 clicks)
Reply With Quote
Reply

Bookmarks

Thread Tools

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Part Number Help, please? lhtex120 Transmissions and Rear Ends 4 July 16th, 2014 07:13 PM
Missing Part ID request (with pic): Flywheel cover? Archiver Previous Forum Posts 3 September 26th, 2011 01:40 AM
some part number help Archiver Previous Forum Posts 0 June 27th, 2011 12:01 PM
error in part number Archiver Previous Forum Posts 0 February 4th, 2005 12:44 AM
Need Part Number Archiver Previous Forum Posts 0 February 4th, 2005 12:12 AM


All times are GMT +1. The time now is 10:09 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2013, Jelsoft Enterprises Ltd 681711554703|1710450577|0