what is this "CLANK-CLANK-CLANK-CLANK" noise? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 01-17-2010, 10:35 AM   #1
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Default what is this "CLANK-CLANK-CLANK-CLANK" noise?

I have a horrible clanking noise coming from the front of the motor that I thought was a lifter, then pulled the valve cover and everything looks good with no metal and no strange wear. When tuning the crank by hand I hear/feel a tick on the crank rpm, not the valve train.

I'm going to go ahead and buy expensive feelers and check the valves, but I fear bottom end disaster like a spun bearing. Are there any other ideas on what this could be?

So much for TXMC Houston.
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Old 01-17-2010, 10:47 AM   #2
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Old 01-17-2010, 10:55 AM   #3
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Old 01-17-2010, 10:59 AM   #4
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Suspension boo boo?
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Old 01-17-2010, 11:06 AM   #5
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Suspension boo boo?
great post, would read again.
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Old 01-17-2010, 11:15 AM   #6
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Check driven accessories (alt, etc) and idler/tensioner?
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Old 01-17-2010, 11:15 AM   #7
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audio/video would help.
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Old 01-17-2010, 11:16 AM   #8
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Quote:
Originally Posted by hustler View Post
I have a horrible clanking noise coming from the front of the motor that I thought was a lifter, then pulled the valve cover and everything looks good with no metal and no strange wear. When tuning the crank by hand I hear/feel a tick on the crank rpm, not the valve train.

I'm going to go ahead and buy expensive feelers and check the valves, but I fear bottom end disaster like a spun bearing. Are there any other ideas on what this could be?

So much for TXMC Houston.
Someone steal your oil? I'm going to go with bottom end disaster(no pun intended)
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Old 01-17-2010, 11:23 AM   #9
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Check driven accessories (alt, etc) and idler/tensioner?
I can feel and hear the tick (long extension on my cranium) through the base of the head.
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Old 01-17-2010, 11:23 AM   #10
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I had a similar hard to find noise. One of the small bolts on the crank pulley had sheared off and others were loose.

Your problem sounds more serious since you feel it when manually rotating the crank. :(
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Old 01-17-2010, 11:25 AM   #11
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audio/video would help.
I tried but the audio on my shitty cam is abject failure.
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Old 01-17-2010, 11:25 AM   #12
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brb, going to check a few things. Pray to Satan for me.
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Old 01-17-2010, 11:52 AM   #13
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brb, going to check a few things. Pray to Satan for me.
blood orgy!
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Old 01-17-2010, 11:57 AM   #14
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Pull the timing belt cover just to make sure something hasn't fallen down in there and is binding up with the crank timing gear.
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Old 01-17-2010, 12:20 PM   #15
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I had a similar problem. I could hear it sorta make a wierd noise when manually rotating by wrench. Mine ended up being a spun bearing. It was a super terrible noise even at idle. I thought for sure it was comming from the valve cover so i took that off... Found nothing. So i pulled the motor for the second time and sure enough as soon as i pulled the oil pan and all the caps... one of my rod bearings were toast. Easy way to tell... drain your oil and look for a golden metallic shimmer. At least that was the color i saw when mine spun.
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Old 01-17-2010, 12:30 PM   #16
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Quote:
Originally Posted by Ben View Post
I had a similar hard to find noise. One of the small bolts on the crank pulley had sheared off and others were loose.

Your problem sounds more serious since you feel it when manually rotating the crank. :(
+1 on the crank pully. The little dowel pin on mine snapped and the 4 little bolts ovaled out their holes. And since my trigger wheel was on the front pully my timing was rocking +- 10 degrees!

Take off your accessory belts and see if you can rock the damper back and fourth on the boss.
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Old 01-17-2010, 12:51 PM   #17
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Bring it to the guy who put it together and get a professional opinion.
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Old 01-17-2010, 01:02 PM   #18
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rod's about to take a dump. Your motor is doomed.

/thread
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Old 01-17-2010, 01:24 PM   #19
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didn't seen any busted valve springs?
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Old 01-17-2010, 02:41 PM   #20
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Valve springs are fine but get this, and its confirmed by Kotomile...it looks like the intake cam is jumping on the back side of the lobe when I rotate by hand and pops. We put a little torque on the cap and could no recreate the symptom, but it was crazy looking.

I'm going to buy feelers, check record each measurement, retorque, and crank the car to see what happens tomorrow.
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