Grinding Noise Inside Valve Cover - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


General Miata Chat A place to talk about anything Miata

Reply
 
 
 
LinkBack Thread Tools
Old 03-24-2007, 02:40 PM   #1
Junior Member
Thread Starter
 
Join Date: Jun 2006
Posts: 166
Total Cats: 0
Default Grinding Noise Inside Valve Cover

It started yesterday when I started the car in the morning b4 I went to work...I though it was a belt maybe hitting my intercooler piping so I shut down the car and looked but saw nothing. I started it again and the car did it for a second then stopped doing it, no other problems until today when I started it and it did the same thing...again it stopped after I shut it down and restarted it and let it run for a bit. Now it does it anytime I stop at a stop light and most of the time in lower RPM range. It has gotten much worse now. It sounds terrible like deep grinding noise. I just pulled the valve cover off...what could it be?
92mazdarati is offline   Reply With Quote
Old 03-24-2007, 03:22 PM   #2
AFM Crusader
iTrader: (18)
 
olderguy's Avatar
 
Join Date: Oct 2004
Location: Wayne, NJ
Posts: 4,438
Total Cats: 84
Default

Could be a bearing on one of the cams.
olderguy is offline   Reply With Quote
Old 03-24-2007, 03:28 PM   #3
Junior Member
Thread Starter
 
Join Date: Jun 2006
Posts: 166
Total Cats: 0
Default

is there a bearing in the CAS...it is really loud and sounded a bit like it was coming from about that area. Can someone tell me what I need to do to replace the cam bearings. Is it a part I can get at my local auto parts store or special order. What is the procedure for replacing the bearings. Do I have to redo the timing? How many bearings are there? Anyone with experience doing this help would be appreciated.

Last edited by 92mazdarati; 03-24-2007 at 04:00 PM.
92mazdarati is offline   Reply With Quote
Old 03-24-2007, 03:33 PM   #4
Senior Member
 
boostinsteve's Avatar
 
Join Date: Oct 2006
Location: Honolulu, HI
Posts: 563
Total Cats: 0
Default

It does sound like extra clearance in the cam bearings. Once the oil is pressurized, the oil crates a cushion.
boostinsteve is offline   Reply With Quote
Old 03-24-2007, 05:25 PM   #5
Junior Member
Thread Starter
 
Join Date: Jun 2006
Posts: 166
Total Cats: 0
Default

UPDATE-
well guys...upon further investigation the noise seemed to be coming fromt he front of the motor and is now a constant loud whirring rubbiing noise...We believe it to be the water pump. what do you guys think
92mazdarati is offline   Reply With Quote
Old 03-24-2007, 05:48 PM   #6
AFM Crusader
iTrader: (18)
 
olderguy's Avatar
 
Join Date: Oct 2004
Location: Wayne, NJ
Posts: 4,438
Total Cats: 84
Default

Water pump would probably leak. More than likely in that location it is one of the timing belt tensioners(bearing wheels)
olderguy is offline   Reply With Quote
Old 03-24-2007, 05:49 PM   #7
Elite Member
iTrader: (5)
 
Atlanta93LE's Avatar
 
Join Date: Sep 2006
Location: Marietta, GA
Posts: 2,198
Total Cats: 1
Default

Could be the tensioner/idler pulleys. They make quite a racket when giving up the ghost.
Atlanta93LE is offline   Reply With Quote
Old 03-24-2007, 06:16 PM   #8
Ben
Supporting Vendor
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

Sounds like it's time for a timing belt, water pump, and related items.

Wouldn't recommend driving it until repaired; water pump failure could be terminal. Timing belt failure wouldn't be catastrophic, but will leave you stranded.
Ben is offline   Reply With Quote
Old 03-24-2007, 06:24 PM   #9
Junior Member
Thread Starter
 
Join Date: Jun 2006
Posts: 166
Total Cats: 0
Default

not sure if this has anything to do w/ it, but my timing belt did seem really lose...????
92mazdarati is offline   Reply With Quote
Old 03-24-2007, 06:47 PM   #10
Senior Member
 
LOLA - 92's Avatar
 
Join Date: Oct 2004
Location: SWAMPS OF FLORIDA !!!
Posts: 1,161
Total Cats: 0
Default

My bet is on WATER PUMP
LOLA - 92 is offline   Reply With Quote
Old 03-24-2007, 06:51 PM   #11
Tour de Franzia
iTrader: (6)
 
hustler's Avatar
 
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,114
Total Cats: 351
Default

Quote:
Originally Posted by LOLA - 92 View Post
My bet is on WATER PUMP
every time I see you av, I want to stab myself in the heart.


I'm putting my money on a tensioner.
hustler is offline   Reply With Quote
Old 03-25-2007, 02:17 AM   #12
Junior Member
Thread Starter
 
Join Date: Jun 2006
Posts: 166
Total Cats: 0
Default

well guys...here is what all I ordered...let me know if there is anything I am forgetting

Timing belt Kit
Water Pump
Cam Seal Set
Crankshaft front Seal set
Valve Cover Gasket
Camshaft Belt Tensioner
Camshaft Valve Idler

Looks like I got some work ahead of me...any tips would be great
92mazdarati is offline   Reply With Quote
Old 03-25-2007, 02:24 AM   #13
Elite Member
iTrader: (13)
 
cjernigan's Avatar
 
Join Date: Oct 2006
Location: Atlanta, GA
Posts: 8,147
Total Cats: 6
Default

Where did you order from and what was the cost?
I might end up doing all that and we talked about it earlier, just curious what route you took. I've been convinced to buy my parts from Mazda which was going to total out to like $170-180 or so.
cjernigan is offline   Reply With Quote
Old 03-25-2007, 02:44 AM   #14
Junior Member
 
Join Date: Mar 2007
Location: SoCal
Posts: 284
Total Cats: 1
Default

Since you have the front end off, you mind as well pull the timing belt gear and replace the front main seal. Mine had a small leak that drenched the bottom of my motor and steering rack (as you can see, filthy!) I just completed the project last week at a tech day and let me tell you.......it's like they tell us in the military, "Use the right tools for the right job". When removing the timing belt gear, we couldn't find a puller that had claws small enough to go behind the gear so we went to Sears, still nothing. We ended up (well, Bill Wilner, of miataroadster.com) fabricating a a puller from a brake press.....

Name:  Custompulley.jpg
Views: 13
Size:  86.8 KB

After a few tweaks, it worked like a charm. But it wasn't until afterwards that we looked at a helms and the book recommended using a steering-wheel puller.DOH!! That would've saved us about 3-4 hours of trying to get that dayam thing off.

Tips:
Don't forget the CAS seal (easier to do with the valve cover off), and don't forget to mark the CAS so you don't have to change timing.

Have the right tools

Have a big-*** breaker-bar for the gear bolt

Don't forget a new Woodruff key and bolt (and use Loctite if you have a short-nose)

Torque ALL bolts to spec

Have some kind of cam-lock device to keep your timing the way you left it, we used the Brainstorm cam-stopper thigmagiggy and it worked wonderful.

When re-installing the timing belt gear, be sure the notches line up.

When installing the timing belt, its WAY easier to line up the cams first then work the belt over the tensioner (loosened).

After we installed everything, the nervous part is always the first start. Mine started up without a hitch and purrrrrd like a *****. The timing was just the way I left it!

Good luck and don't forget to post any problems you might have. I think everything that could go wrong with my install, did, so i learned a lot.
Exhondaman is offline   Reply With Quote
Old 03-25-2007, 02:56 PM   #15
Junior Member
Thread Starter
 
Join Date: Jun 2006
Posts: 166
Total Cats: 0
Default

Good tips...the main thing I am worried about is keeping the timing how it is. This willl be my first timing belt replacement and hopefully all goes well. What is a "woodruff key"...is it something I should for sure replace?
thanks

I bought my parts from www.autohausaz.com I have purchased many VW parts from them and they are a company I trust. Everything cost me like $180 shipped. They were the cheapest I could find
92mazdarati is offline   Reply With Quote
Old 03-25-2007, 03:33 PM   #16
:(
iTrader: (7)
 
Join Date: Jul 2006
Location: nowhere
Posts: 8,281
Total Cats: 2
Default

woodruff key is the metal deal that goes into the slot of your crank pulley if it looks worn replace it. if the crank looks worn you might look into the locktite fix. once you have it close to being apart this will all be aparent to you hopefully.
magnamx-5 is offline   Reply With Quote
Old 03-25-2007, 09:34 PM   #17
Junior Member
 
Join Date: Mar 2007
Location: SoCal
Posts: 284
Total Cats: 1
Default

Quote:
Originally Posted by 92mazdarati View Post
Good tips...the main thing I am worried about is keeping the timing how it is. This willl be my first timing belt replacement and hopefully all goes well. What is a "woodruff key"...is it something I should for sure replace?
thanks

I bought my parts from www.autohausaz.com I have purchased many VW parts from them and they are a company I trust. Everything cost me like $180 shipped. They were the cheapest I could find
Here;s a good read: http://www.miata.net/garage/hsue/LoctiteCrank1.html

Good tips on the timing belt replacement: http://www.miata.net/garage/timingbelt.html
Exhondaman is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Raleigh: Fiberglass headlight scope, 1.6L ECU, AFM, Hardtop latches, more bigmackloud Miata parts for sale/trade 13 09-22-2017 01:34 PM
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 57 07-19-2017 05:11 PM
1994 Spec Miata Race Car SM/SM2/SSM For Sale Quinn Cars for sale/trade 6 10-23-2016 08:58 AM
OTS Bilstein to motorsports ASN conversion stoves Suspension, Brakes, Drivetrain 5 04-21-2016 04:00 PM
Another Alternator thread ihiryu General Miata Chat 9 09-28-2015 11:22 AM


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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 12:43 AM.