Camshaft endplay, bad thrustplate? - Pontiac GTO Forum
User Tag List

 
LinkBack Thread Tools Display Modes
post #1 of 8 (permalink) Old 12-16-2014, 02:43 PM Thread Starter
 
Join Date: Feb 2014
Location: Columbus
Posts: 97
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Camshaft endplay, bad thrustplate?

Finished the short block for my '69, and moving into building up the long block, I have run into a problem.

Put in the cam and timing gear, I find the end play is out of spec. Pontiac calls for 4-7 thous., I keep getting 12-13. So I pulled everything apart and the aftermarket thrustplate I recently bought from Ames is ~0.008 thinner than the plate that came off of the engine. Has anybody else had this problem? Is there any other reason that cam could be shifting around in the block?

Always possible I have done something stupid, too. Doesn't seem like there is much to go wrong in this situation, though.
ibarbuckle is offline  
Sponsored Links
Advertisement
 
post #2 of 8 (permalink) Old 12-16-2014, 06:15 PM
 
Join Date: Dec 2012
Location: Gastonia, NC - Born & raised in Connecticut - 31 years
Posts: 3,311
Mentioned: 0 Post(s)
Tagged: 1 Thread(s)
Quoted: 321 Post(s)
Garage
I found this on another forum which might help?

"Cam endplay should be .003" to .007".

"The endplay is determined by the thrust plate thickness, as that gets sandwiched between the cam and the upper timing gear.

If your looking at the endplay w/o the upper timing gear on there, then your not seeing things they way they should be.

Also, the cam "snout" needs to be pulled past the face of the upper cam gear to properly set the actual endplay. This is acheived via the "step" that is on the fuel pump eccentric, it allows the snout of the cam to be pulled past the face of the cam gear."
PontiacJim is offline  
post #3 of 8 (permalink) Old 12-16-2014, 06:27 PM
 
Join Date: Mar 2014
Location: Bellevue Wa
Posts: 18
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Defiantly check the eccentric. I once seen it installed "catty wampums" over the nose causing so much end play that it made the base timing erratic by 15 degrees.

To much cam thrust will change ignition timing (not mechanical) cause of the 45 degree distributor gear.
Cory is offline  
 
post #4 of 8 (permalink) Old 12-17-2014, 05:09 AM Thread Starter
 
Join Date: Feb 2014
Location: Columbus
Posts: 97
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thank you gentlemen.
ibarbuckle is offline  
post #5 of 8 (permalink) Old 12-18-2014, 08:46 AM Thread Starter
 
Join Date: Feb 2014
Location: Columbus
Posts: 97
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Update:

The repo I bought was definitely too thin. Got one from a different supplier and everything is good.

For posterity, this is what I ended up with:



Nitemare thrustplate
ibarbuckle is offline  
post #6 of 8 (permalink) Old 12-18-2014, 05:36 PM
 
Join Date: Dec 2012
Location: Gastonia, NC - Born & raised in Connecticut - 31 years
Posts: 3,311
Mentioned: 0 Post(s)
Tagged: 1 Thread(s)
Quoted: 321 Post(s)
Garage
Quote:
Originally Posted by ibarbuckle View Post
Update:

The repo I bought was definitely too thin. Got one from a different supplier and everything is good.

For posterity, this is what I ended up with:



Nitemare thrustplate
Thanks for the update. Checking the cam endplay is something I never have checked, let alone knew it was to be checked. I also have always installed the factory thrustplate.

I guess it seems with most all aftermarket, non-factory manufactured parts, the part may look like original until you take some measurements or try and fit/install the part. I have run into the same thing, but if you can't get it "factory new" or don't want to pay NOS prices, then you buy what you can and hope for the best -even if it takes some fitting to make it work. And that's why we are hot-rodders!
PontiacJim is offline  
post #7 of 8 (permalink) Old 04-12-2019, 09:15 PM
 
Join Date: Apr 2019
Posts: 1
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
There is a guy that makes a Pontiac Cam trust plate with roller Torrington bearings. These are great for all cams but are a must for roller cams. His name is Scott Sims he does the work for $285 his contact info: 812-350-8637 or [email protected]. Or you could pick up a cheap stock one for $50.

Raleigh251
Raleigh251 is offline  
post #8 of 8 (permalink) Old 04-13-2019, 11:12 AM
 
Join Date: Dec 2012
Location: Gastonia, NC - Born & raised in Connecticut - 31 years
Posts: 3,311
Mentioned: 0 Post(s)
Tagged: 1 Thread(s)
Quoted: 321 Post(s)
Garage
Quote:
Originally Posted by Raleigh251 View Post
There is a guy that makes a Pontiac Cam trust plate with roller Torrington bearings. These are great for all cams but are a must for roller cams. His name is Scott Sims he does the work for $285 his contact info: 812-350-8637 or [email protected]. Or you could pick up a cheap stock one for $50.

Raleigh251
Thanks for the reference. However, I am curious why you said this is a must for a roller cam. I have never used a roller cam, but others here do/have. So why is this a must and what will happen to a roller cam if you do not use one and go with a stock type thrust plate?
PontiacJim is offline  
Sponsored Links
Advertisement
 
Reply

  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO Complete Engine Compartment Discussion

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Pontiac GTO Forum forums, you must first register.
Please enter your desired user 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:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Bad Ground? Bad Link? Bad NSW? rock36 1964-1974 Tempest, LeMans & GTO Technical and Electrical Wiring 4 05-27-2014 04:57 AM
Camshaft Chitown goat Engine Discussions 3 09-12-2012 02:56 PM
66 camshaft johnnylightning03 1964-1974 Tempest, Lemans & GTO Complete Engine Compartment Discussion 9 04-12-2009 10:51 AM
Finding bad bad vibrations [email protected] 1964-1974 Tempest, Lemans & GTO General Discussion 11 11-25-2008 10:38 AM

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

 
For the best viewing experience please update your browser to Google Chrome