Grinding noise on startup - Nissan 350Z Forum, Nissan 370Z Tech Forums
User Tag List

 
LinkBack Thread Tools Search this Thread
post #1 of 8 (permalink) Old 08-22-2017, 02:22 PM Thread Starter
Base Member
 
Join Date: Jun 2017
Posts: 13
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
Grinding noise on startup

Goodmorning, so I replaced the valve seals in my 2003 touring 350z. At the same time I replaced all timing chain tensioners just for the hell of it. I drove it for around 850km and now after the car sits for a while, cools down, there is a terrible metal on metal grinding sound on startup coming from the engine bay. It only happens for about 2 seconds then disappears. After that the car runs just fine. Wondering if anyone has had this problem and fixed it? could it be that I put in a faulty chain tensioner? Or would it be more from mal-lubrication of the chain? I read a G35 thread describing the same symptoms my cars having. The result of that was a new engine due to metal shaving being circulated throughout the engine. He said the best way to diagnose his particular issue was to drop the oil pan and check for shavings. I'm going to do that tonight but what are your opinions on the grinding sound?
Thanks
Quinn Gifford is offline  
Sponsored Links
Advertisement
 
post #2 of 8 (permalink) Old 08-25-2017, 09:18 AM
Grand Touring Member
 
dkmura's Avatar
 
Join Date: Feb 2004
Posts: 1,050
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 100 Post(s)
Wow- the timing chain is designed to last the life of the VQ engine. I wouldn't replace it unless absolutely necessary. Let us know what you found when you dropped the pan.
dkmura is offline  
post #3 of 8 (permalink) Old 08-31-2017, 12:12 PM Thread Starter
Base Member
 
Join Date: Jun 2017
Posts: 13
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
So I took the oil pan off and found no shavings which is good. I would like to say that the "grinding" noise I described is inaccurate for what I'm experiencing. I would say it's more resembles slack in a chain, not grinding. Sorry about that
Quinn Gifford is offline  
 
post #4 of 8 (permalink) Old 08-31-2017, 11:03 PM
Grand Touring Member
 
dkmura's Avatar
 
Join Date: Feb 2004
Posts: 1,050
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 100 Post(s)
Did you replace the chain tensioner when you swapped out the timing chain? Is there a chance an error is reassembly is causing the noise?
dkmura is offline  
post #5 of 8 (permalink) Old 09-01-2017, 07:00 PM Thread Starter
Base Member
 
Join Date: Jun 2017
Posts: 13
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
Well I never replaced the timing chain, I replaced the valve seals and then the mechanic who I was working with noticed that one of the tensioners wasn't working properly. So we decided to buy new tensioners and replace the old ones. I would say that it's always a possibility that the tensioners or one of them is faulty. As for putting the engine back together properly I'm sure we did. The car runs fine, and it hasn't blown up yet. Haha
Quinn Gifford is offline  
post #6 of 8 (permalink) Old 09-02-2017, 01:03 PM
Grand Touring Member
 
dkmura's Avatar
 
Join Date: Feb 2004
Posts: 1,050
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 100 Post(s)
VQ engines are precision machines. If there's a grinding noise upon startup, there's something wrong with either the part, or the way it was installed.
dkmura is offline  
post #7 of 8 (permalink) Old 09-05-2017, 04:07 PM Thread Starter
Base Member
 
Join Date: Jun 2017
Posts: 13
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
Hmmm okay thank you for your input!
Quinn Gifford is offline  
post #8 of 8 (permalink) Old 09-05-2017, 10:59 PM
Grand Touring Member
 
dkmura's Avatar
 
Join Date: Feb 2004
Posts: 1,050
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 100 Post(s)
Let us know what you find what was the problem.
dkmura is offline  
Sponsored Links
Advertisement
 
Reply

Thread Tools Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search



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
Trackbacks are On
Pingbacks are On
Refbacks are On

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