Big block guide plate question? - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

 
LinkBack Thread Tools Display Modes
post #1 of 4 (permalink) Old Jan 25th, 10, 04:49 PM Thread Starter
 
Join Date: Sep 2007
Posts: 56
Big block guide plate question?

I have been trying to track down an annoying ticking noise on the left side of my 396 big block. I am fairly certain its a valve train noise. I've adjusted the valves several times and checked just about everything I can think of. I did notice one of the pushrods had some deep wear marks on the side where one of the guide plates was rubbing on it. I bent the guide plate over a little so it wasn't binding with the pushrod. This quieted down some of the noise, but not all of it. My 396 has the stock GM guide plates which I believe were made to fit 7/16" diameter pushrods. The pushrods I have now are Comp Cams 3/8" diameter. I am running a Comp cams roller cam and rockers and these are the required shorter pushrods. Being the pushrods are smaller in diameter the rockers can move side to side more. Is it possible that this could be causing the ticking noise?
refspd is offline  
Sponsored Links
Advertisement
 
post #2 of 4 (permalink) Old Jan 25th, 10, 05:05 PM
Gold Lifetime Member
Fred
 
Join Date: Nov 2006
Location: Seabeck WA
Posts: 8,375
Re: Big block guide plate question?

What's the cadence? Every rotation? Half engine speed? Do you have a stethoscope?
This reminds me of a story.
Us kids used to hang out at the local gas station. The older guys who had a drivers license and a car would drop by. Us kids hung on every word spoken. Then Fonzie was having a problem with his 32 coupe. It was ticking and no one could figure it out. We were all hanging over the engine. I said "broken fuel pump return spring". Hey, it must have one, right? The looks from the older guys were memorable. Fonzie pulled the pump on the spot. Sure enough. That's when I knew for sure that I was a gearhead.

One owner 69 Camaro,(yep, bought it new
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
)
RS SS Hugger Orange, L88, 4:10's tru-tack posi, ducted hood, Endura, spoilers.
TH400 (CX) with Coan 8" converter, GV-OD, 8 track still on console and best et 10.495,
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
128.79mph 1.428 60'
All with 1960's stuff. (except tires and converter)
+ MT Super Scavenger headers & 3" full exhaust with X pipe. 3700 lbs. with me in it.
1000cfm AED and HD Harold-Lunati SR, 725 lift with shaft rockers too.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Fred Ficarra is offline  
post #3 of 4 (permalink) Old Jan 25th, 10, 05:20 PM Thread Starter
 
Join Date: Sep 2007
Posts: 56
Re: Big block guide plate question?

Yea I have a stethoscope and i narrowed it down to the drivers side valve cover. Trying to rule out the guide plates. Next I'm gonna pull the intake and look at the lifters. They feel good though "not spongey" . Thanks for the fuel pump suggestion though. Already checked it. Checked valve cover clearance, ran the valves eoic and with it running, checked for exhaust leaks to. Anybody not about the guide plates?
refspd is offline  
 
post #4 of 4 (permalink) Old Feb 13th, 10, 09:31 AM
Senior Tech
Ron
 
Join Date: Nov 2006
Location: North Channel Lake Huron
Posts: 3,934
Re: Big block guide plate question?

Providing you're running a FT cam, with the valve covers off and engine idling ensure all push rods are spinning. Any not spinning is a sign of something wrong - possible wiped lobe or bad lifter. A worn Rocker Fulcrum or Rocker Nut can back off fast and cause that clack or tick. Sometimes the threads on the Rocker Stud are shot or the Rocker is galling the stud. Also inspect for broken Springs and Dampers. By the way, if you're running 3/8" push rods you should be using 3/8" guide plates. It's not uncommon the cut the Guide Plates in two and massage the forks to align the Rocker Tips squarely on the Valve Stems with minimal sweep. The Guide Plate Forks should fit snug but allow the Push Rods to spin. If you see galling on the Push Rods the Guide Plates are either too wide or misaligned. This may not account for your TIC but can cause wear to the Lobes, Rockers and Valve Stems.

After adjusting tappets and a tic is there, with the engine idling, I will use a hardwood stick and push down onto the Rocker Ends to determine where the sound is coming from. When you find the trouble spot you will notice a difference in sound.

I cut the top of an old valve cover to prevent Oil Splash when inspecting the valve train or adjusting Tappets with Hydraulic Lifters:



X2 on that Exhaust Manifold or Header leak ;o)

Z15CAM - There was a Viper in my Rear View
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

This was my 70 1/2 Z28

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Last edited by Z15CAM; Feb 13th, 10 at 11:17 AM.
Z15CAM is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Team Camaro Tech 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.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.



Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



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