Strange Noises - 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 06-05-2008, 10:54 PM   #1
Elite Member
Thread Starter
iTrader: (33)
 
RotorNutFD3S's Avatar
 
Join Date: Jan 2007
Location: Newnan, GA
Posts: 2,539
Total Cats: 29
Default Strange Noises (Need Input Quick!)

I've noticed in the past few days that my engine has gotten louder, I couldn't get a video or sound clip that didn't just sound like a normal engine running, but I can hear the difference. I can only explain it as it sounds like the crank pulley, or something in that area, is whirring much louder than normal. But it is in the mid to lower section of the front of the engine block. And there is no power steering pump or a/c compressor either, just in case someone wants to guess that.

Also on occasion recently, there's been a popping (kinda grinding) sound at start-up, does it a handful of times, no rhythm to it, and then stops, but not at every start-up. It sounds like the teeth on the timing belt are slipping over the gears, however, the car still runs and idles perfectly and timing is still dead on.

So, I'm thinking it's time for a timing belt, water pump, etc. change since the car is at 95k and knowing that it should be done around 60-70k and I don't honestly remember if the previous owner had told me if it had been done or not. I just know that the noises are coming from that area, and I really have no desire to kill my car. So that's my logical guess. Any ideas?

Last edited by RotorNutFD3S; 06-05-2008 at 11:44 PM.
RotorNutFD3S is offline   Reply With Quote
Old 06-06-2008, 09:30 AM   #2
Ben
Supporting Vendor
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

Uhm, ehh, uhh, hmm. Sounds like a noise and junk n stuff or something, eh? Really, while your diagnostics are poor, at least you can write in english well.

"Sounds" like you might have a noisy timing belt tensioner or idler, or a noisy water pump. You can confirm with a stethoscope at the front of the engine, or if you don't have one, any of the various ghetto vac hose and bolt methods will work.

So you'll need:
timing belt
water pump
water pump gasket
front crank seal
cam seals (2)
timing belt idler
timing belt tensioner
timing belt tension spring

I've got the same job coming up on my car too, though I'm also going to install new cams, pull the head off, replace the HG, and go back together with ARP studs.
Ben is offline   Reply With Quote
Old 06-06-2008, 11:25 AM   #3
Elite Member
iTrader: (5)
 
m2cupcar's Avatar
 
Join Date: Jan 2005
Location: Atlanta
Posts: 7,236
Total Cats: 288
Default

I'm with Ben. I've used a small pvc pipe for a make-shift stethoscope.
m2cupcar is offline   Reply With Quote
Old 06-06-2008, 11:35 AM   #4
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,833
Total Cats: 1,786
Default

Quote:
Originally Posted by m2cupcar View Post
I'm with Ben. I've used a small pvc pipe for a make-shift stethoscope.
I use 1.5" heater hose, fits on my large ears better.
Braineack is offline   Reply With Quote
Old 06-06-2008, 11:58 AM   #5
Elite Member
iTrader: (5)
 
m2cupcar's Avatar
 
Join Date: Jan 2005
Location: Atlanta
Posts: 7,236
Total Cats: 288
Default

Quote:
Originally Posted by Braineack View Post
I use 1.5" heater hose, fits IN my large ears better.
there now I believe you have big ears... hey, that gives me an idea for a "detcan"
m2cupcar is offline   Reply With Quote
Old 06-06-2008, 02:21 PM   #6
Elite Member
Thread Starter
iTrader: (33)
 
RotorNutFD3S's Avatar
 
Join Date: Jan 2007
Location: Newnan, GA
Posts: 2,539
Total Cats: 29
Default

I don't know how the diagnostics are poor, other than I can't pinpoint exactly what it's doing. I said I can hear the difference, where it's coming from, however not affecting the car in any way. If you heard the car, you'd probably describe it in the same manner I have.

Anyway, I'll try that out and see what I can hear. I know one of the techs in the back has a stethoscope.

I'm pretty much set on replacing the timing belt and nearby stuff anyway. And thanks for the list Ben, actually made one last night that included all that stuff. On another note, are the Gates belts that MiataRoadster.com sells really any better, or would I be just as well off getting OEM?
RotorNutFD3S is offline   Reply With Quote
Old 06-25-2008, 01:27 AM   #7
Elite Member
Thread Starter
iTrader: (33)
 
RotorNutFD3S's Avatar
 
Join Date: Jan 2007
Location: Newnan, GA
Posts: 2,539
Total Cats: 29
Default

Water pump is indeed the culprit and I can only assume the timing belt is missing a few teeth.

As of right now, my list for the timing belt project is:
Timing Belt
Water Pump w/ mounting and inlet gaskets
Front Crank/Main Seal
2 Cam Seals
Timing Idler Pulley
Timing Tensioner Pulley
Timing Tensioner Spring
Woodruff Key
Main Accessory Belt (since I'm without a/c and p/s)

However, I still wonder about the question in my previous post, are the Gates belts any better, or am I fine with the OEM?

Also, I figured it wouldn't hurt to replace the thermostat and gasket since I'm working in that area anyway, typical OEM ok here as well, even with turbo and all?

Going to replace the CAS, has anyone used the Viton one that miataroadster sells? Reviews?

When doing this project, has anyone found it necessary to replace the water pump top rubber seal (http://www.finishlineperformance.com...cat=319&page=2) or the main crankshaft bolt (was on a price quote I got, but no one ever mentioned it before)?
RotorNutFD3S is offline   Reply With Quote
Old 06-25-2008, 02:07 AM   #8
Antisaint
iTrader: (17)
 
Vashthestampede's Avatar
 
Join Date: Feb 2007
Location: Danbury, CT
Posts: 4,659
Total Cats: 54
Default

Quote:
Originally Posted by RotorNutFD3S View Post
When doing this project, has anyone found it necessary to replace the water pump top rubber seal (http://www.finishlineperformance.com...cat=319&page=2) or the main crankshaft bolt (was on a price quote I got, but no one ever mentioned it before)?
I'm not sure what that seal is for on the waterpump, I don't remember seeing that. When I did my timing belt job I replaced the water pump itself, and the 2 gaskets for it. And the main crankshaft bolt should be replaced as I've read they will contort and re-using the old one is a no no.

Vash-
Vashthestampede is offline   Reply With Quote
Old 06-25-2008, 09:35 AM   #9
AFM Crusader
iTrader: (18)
 
olderguy's Avatar
 
Join Date: Oct 2004
Location: Wayne, NJ
Posts: 4,438
Total Cats: 84
Default

Should always change the main crank bolt when doing the waterpump/timing belt. Clean out the threads in the crankshaft and apply threadlocker when assembling and torque to spec.

It is only a few dollars and I have seen used the used bolts stress cracked enough to break when dropped on a cement floor.


EDIT: Vash beat me to it.
olderguy is offline   Reply With Quote
Old 06-25-2008, 09:37 AM   #10
AFM Crusader
iTrader: (18)
 
olderguy's Avatar
 
Join Date: Oct 2004
Location: Wayne, NJ
Posts: 4,438
Total Cats: 84
Default

Some places list the seals/gaskets separately.
olderguy is offline   Reply With Quote
Old 06-25-2008, 09:41 AM   #11
AFM Crusader
iTrader: (18)
 
olderguy's Avatar
 
Join Date: Oct 2004
Location: Wayne, NJ
Posts: 4,438
Total Cats: 84
Default

Quote:
Originally Posted by RotorNutFD3S View Post
When doing this project, has anyone found it necessary to replace the water pump top rubber seal (http://www.finishlineperformance.com...cat=319&page=2) or the main crankshaft bolt (was on a price quote I got, but no one ever mentioned it before)?
Water pumps I have purchased included this seal, but your old one will probably work. This is part of the TB cover system to keep out dust.
olderguy is offline   Reply With Quote
Old 06-25-2008, 11:32 AM   #12
Elite Member
Thread Starter
iTrader: (33)
 
RotorNutFD3S's Avatar
 
Join Date: Jan 2007
Location: Newnan, GA
Posts: 2,539
Total Cats: 29
Default

Great. Thanks for the input! Any answers on the other questions folks?
RotorNutFD3S is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Need help - Stock Balancer and Fastforward overlay pulleys Frank_and_Beans Supercharger Discussion 13 09-12-2016 09:17 PM
Bad head gasket or ? shooterschmidty Engine Performance 8 09-30-2015 11:28 PM
Another Alternator thread ihiryu General Miata Chat 9 09-28-2015 11:22 AM
Headphones PaperMate Insert BS here 32 09-25-2015 09:22 AM
VE values too low? compuw22c MEGAsquirt 4 09-12-2015 08:42 PM


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 01:01 AM.