389 Rattles - Pontiac GTO Forum
User Tag List

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 24 (permalink) Old 09-19-2011, 09:34 AM Thread Starter
 
Join Date: Sep 2011
Location: LOWELL, MI.
Posts: 9
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
389 Rattles

Recently had 1964 GTO 389 professionaly rebuilt. Have appx. 1500 miles on it and have changed oil 3 times using Lucas zinc additive. After sitting and cold in the morning, it rattles like rod noise until pressure is up (2-3 seconds). It is getting progressively worse and I was told there is an oil check valve/spring where the oil filter mount bolts to the block that may be bad. I wonder if it is just a loose motor? Carries 50-60 psi once running. Any ideas?
roush05 is offline  
Sponsored Links
Advertisement
 
post #2 of 24 (permalink) Old 09-19-2011, 12:20 PM
 
Join Date: Oct 2007
Location: Long Island NY
Posts: 4,702
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Garage
Sounds like lifters to me....maybe as a result of low oil pressure at start up. Eric



Eric Animal is offline  
post #3 of 24 (permalink) Old 09-19-2011, 04:27 PM
Super Moderator
 
BearGFR's Avatar
 
Join Date: Aug 2008
Location: Springtown, TX
Posts: 5,737
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 122 Post(s)
Garage
Definitely a prime suspect. Do you have a way to record a video of it with sound?


Bear

BearGFR
Springtown, TEXAS
BearGFR is online now  
 
post #4 of 24 (permalink) Old 09-19-2011, 06:05 PM
64-67 Expert
 
geeteeohguy's Avatar
 
Join Date: Feb 2008
Location: Fresno, California
Posts: 8,478
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 99 Post(s)
x3. A video will help the rest of us in trying to determine if it's lifters or loose clearances.
geeteeohguy is online now  
post #5 of 24 (permalink) Old 09-20-2011, 08:12 AM Thread Starter
 
Join Date: Sep 2011
Location: LOWELL, MI.
Posts: 9
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
389 rattles

Not sure video would detect rod noise on initial cold start. Have been told that advanced timing (about 36 deg) and 91-93 octane produces "Ping" and along with decked heads and block may be running 11 to 1 compression. Had a mechanic tell me the motor will self destruct with cold starts and dry bearings as a result of loose clearance / worn bearings after 1500 miles??
Suggests: dished pistons to reduce compression, new bearings,rings, and polish crank. Hopefully has not been hurt. Is already .010 under.
roush05 is offline  
post #6 of 24 (permalink) Old 09-20-2011, 08:20 AM
Former Super Moderator
 
Rukee's Avatar
 
Join Date: Feb 2007
Location: South Central Wisconsin
Posts: 9,919
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 21 Post(s)
If that is in fact what's going on, it could have been caused by not priming the oil pump durring assembly. Now that the pump is working, replacing the rod bearings might be all that's needed. I would be sure to use some plasticgauge on them to check clearances when installing the new bearings.
Rukee is offline  
post #7 of 24 (permalink) Old 09-20-2011, 08:59 AM Thread Starter
 
Join Date: Sep 2011
Location: LOWELL, MI.
Posts: 9
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
389 rattles

Thanks for responses. Maybe at this point new bearings will work if crank is not hurt. Is the advanced timing, higher compression, and pinging a factor in the bearing failure?
roush05 is offline  
post #8 of 24 (permalink) Old 09-20-2011, 09:03 AM
Former Super Moderator
 
Rukee's Avatar
 
Join Date: Feb 2007
Location: South Central Wisconsin
Posts: 9,919
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 21 Post(s)
I've been running 11.1 compression with the factory distributer and Tri-Power for 16+ years and have not had any bearing failures. I have seen cast pistions fail with pinging though. Be sure your running forged pistions.
Rukee is offline  
post #9 of 24 (permalink) Old 09-20-2011, 09:07 AM Thread Starter
 
Join Date: Sep 2011
Location: LOWELL, MI.
Posts: 9
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Do you run pump gas / octane boost? Maybe I can save this motor without major rebuild by just replacing rod bearings. Just want a dependable car.
roush05 is offline  
post #10 of 24 (permalink) Old 09-20-2011, 09:11 AM
Former Super Moderator
 
Rukee's Avatar
 
Join Date: Feb 2007
Location: South Central Wisconsin
Posts: 9,919
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 21 Post(s)
Yes I run on pump non ethanol premium gas, with the timing reduced. I do like to run race fuel about every other tank though, and man does it make a difference!!
Rukee is offline  
Sponsored Links
Advertisement
 
Reply

  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO General 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
Shift knob rattles CrazyGerman Drive train, suspension, alignment and brakes. 19 06-30-2009 02:26 PM
Interior Rattles Questor Interior Discussions 8 07-02-2007 10:55 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