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 December 19th, 2014, 01:15 AM
blakeman350 blakeman350 is offline
Junior Member
 
Join Date: Dec 2014
Location: gillette, wy
Truck: 1967 gmc
Posts: 3
Rep Power: 0
blakeman350 is on a distinguished road
Default new to the page, need some 305 v6 help

I have a 67 gmc with a 305 that had some bent push rods. I have new rods and have already removed the rocker assembly but I need some info on putting everything back in. What do I adjust the valves to cold before I start it up and what to torque the rocker assembly bolts to. Any help would be greatly appreciated.
Reply With Quote
  #2  
Old December 21st, 2014, 01:11 AM
blakeman350 blakeman350 is offline
Junior Member
 
Join Date: Dec 2014
Location: gillette, wy
Truck: 1967 gmc
Posts: 3
Rep Power: 0
blakeman350 is on a distinguished road
Default Re: new to the page, need some 305 v6 help

Anybody?
Reply With Quote
  #3  
Old December 21st, 2014, 01:55 AM
odin8183 odin8183 is offline
Junior Member
 
Join Date: Jan 2013
Location: Meridian, Idaho
Truck: 1966 1500 351E
Posts: 15
Rep Power: 73
odin8183 is on a distinguished road
Default Re: new to the page, need some 305 v6 help

blakeman350:
First exam the push rods, roll across a flat surface to ensure straightness then verifying with measurements and visually that they all are the same. Lube and install the push rods. Examine the rocker arms for damage. Install the rocker arms torquing the shafts to 20-25 foot lbs.
I’ll try to simplify cold valve adjustment. You might want to just sketch the cylinders and valves on a simple diagram.

Standing in front of the engine the left 3 cylinders are #2, #4 and #6 from front to rear and #1, #3 and #5 cylinders on the right. Valves on the left from front to rear will be
Exhaust then Intake for #2, Exhaust then Intake for #4 and Intake then Exhaust for #6. Valves on the right are Exhaust then Intake on #1, Intake then Exhaust on #3 and Intake then Exhaust on #5.
For the cold setting turn the crankshaft manually and set each Intake valve gap to .014 inches and each exhaust valve gap at .020 inches. Set the Intake’s valve gap when that cylinder’s exhaust valve starts to open- this would be when the push rod starts up. Set the exhaust valves when the Intake valve starts to close- this would be when the push rod starts to go down.

I’ve used this procedure several times in the 30 years I've owned my '66 and have found it’s not worth the effort nor is it needed to go back and set the valves hot per the manual (with a 160 degree warm and running engine) setting the Intake at .012 and exhaust at .018. Usually the cold setting when the engine is warm are the same as the required warm settings.

If you have bent push rods you may have other damage that'll get much more complex and costly than replacing push rods. Good luck.

CO'T
Reply With Quote
  #4  
Old December 21st, 2014, 02:06 AM
blakeman350 blakeman350 is offline
Junior Member
 
Join Date: Dec 2014
Location: gillette, wy
Truck: 1967 gmc
Posts: 3
Rep Power: 0
blakeman350 is on a distinguished road
Default Re: new to the page, need some 305 v6 help

Hey Odin I really appreciate the info. This is the first gmc v6 I've ever had and it's been a learning experience for sure. I've looked over everything in the engine and it looks like the damage was mainly push rods luckily. I'm going to install the new rods this week when I get on days off so I'll let you know how it goes. Thanks again for the reply.
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
V6 305 Archiver Previous Forum Posts 0 August 20th, 2010 01:04 AM
305 V6 Archiver Previous Forum Posts 0 December 20th, 2004 12:38 AM
305 v6 Archiver Previous Forum Posts 0 July 22nd, 2004 04:54 AM
305 v6 Archiver Previous Forum Posts 0 March 29th, 2004 12:34 AM


All times are GMT +1. The time now is 02:28 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2013, Jelsoft Enterprises Ltd 681711554703|1710509306|0