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Old 08-29-2010, 09:36 PM   #21
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Originally Posted by SlideRuler View Post
9 times out of 10 my car doesn't do it. Only after I drive it hard, park, and start it 5-10 minutes later. It'll tick from anywhere from 20 seconds to 5 minutes.
There you go making stupid posts again.
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Old 08-29-2010, 09:45 PM   #22
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Anything hydrollic acts on fluid pressure. If the is no fluid there is no pressure. This causes lifters and actuators to bottom or top out. The metal on metal contact makes the hash clicking noise until fluid pressure is built up to pervent said contact.

I would treat it exactly the same as HLA noise.

Do you have heavier valve springs? This would magnify the effect because the cams would have just a bit more resistance to rolling because of the increase pressure on the lobes.

"hydrollic".... lol.

Just stop posting in here, you have no idea what you're talking about. The VVT system uses oil pressure and is activated by an electronic solenoid...nothing like HLAs on 90-97 engines that just use oil pres. to push on the lifters. Also, VVT isn't a on/off kinda system, it's constantly variable based on rpm and engine load and makes seemless adjustments.


Fae- I know the sound...it sounds like a friggin' diesel engine at start up, sometimes it starts immediately, sometimes there is a small delay between start up and the noise (~1 second) and it's LOUD. Amirite? When I heard it, I was too terrified to let it keep going enough for me to get out of the car and look for the sound. As I said before, I'd always turn the car off and crank it back up and it would be gone. Thinking back, it only did it on cold start up and when outside temps were cool to cold.
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Old 09-01-2010, 03:21 AM   #23
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...on the intake cam sits the Variable Timing Actuator. It is a simple vane style unit. The housing of the unit is fixed to the pulley and the vane is fixed to the cam. The unit is sealed to protect it and maintains its precision. Right behind the actuator is the OCV, Oil Control Valve. This is nothing more than an electrically controlled spool valve. As the OCV (spool valve) rotates, oil pressure in the actuator changes and the actuator advances or retards the intake valve timing. THE ACTUATOR HAS TWO HYDRAULIC CHAMBERS, AN ADVANCE AND RETARD CHAMBER. THE OIL PUMP SUPPLIES ENGINE OIL TO EACH CHAMBER; and as just mentioned the oil control valve controls the pressure in the actuator.
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The hydraulic lifter consists of a hollow expanding piston situated between the camshaft and valve. The lifter is filled with engine oil intermittently from an oil gallery via a small drilling. When the engine valve is closed, the lifter is free to fill with oil.
Fea, both systems could have empty hydraulic chambers at start up. If those chambers are fully collapsing without engine oil the you would hear the effect. Just my two cents.

Dopple, nice catch on the "hydrollic"
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Old 09-01-2010, 09:54 AM   #24
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Originally Posted by Underway View Post
Fea, both systems could have empty hydraulic chambers at start up. If those chambers are fully collapsing without engine oil the you would hear the effect. Just my two cents.

Dopple, nice catch on the "hydrollic"
This isn't a $0.02 issue.

That being said, I have no idea about non HLA noises. I know my HLA's sing to me a nice drum solo when my oil gets about 2500 miles, lets me know it's about that time.
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Old 09-01-2010, 02:03 PM   #25
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It's not a typical HLA noise if it's what I think it is..and I'm pretty sure I know what Fae is hearing. The frequency is much greater/faster than a HLA noise, it's much louder and the tone is deeper.

Also...99+ engines do not have hydraulic lifters...again.
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Old 09-01-2010, 02:34 PM   #26
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I have been told that there is a locking pin in the VVT mechanism that can shear. When that happens upon start up this noise can happen.

Dope- it is like a diesel running but only for a few seconds.

Have a great day,
Jared
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Old 09-01-2010, 06:44 PM   #27
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Also...99+ engines do not have hydraulic lifters...again.
I'm aware, if that was directed at me. Was just using this as an opportunity to bitch about my displeasure with HLA noise. All the more reason to go with a newer head.
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Old 09-01-2010, 08:01 PM   #28
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[off_topic]For people with HLAs, if you are displeased with the clatter, do this and you will never have a problem again.
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[on_topic] GL man, hope you find the problem
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Old 09-01-2010, 08:38 PM   #29
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If you find out that it is the VVT adjuster/cam sprocket (or what ever you call it), here is the mazda part number for it. BP6D-12-4X0. Depending on the vin there will be an a,b,c, or d at the end of the number. You will have to find that out when you order it.

Have a great day,
Jared
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Old 09-01-2010, 10:26 PM   #30
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Originally Posted by Jfornachon View Post
I have been told that there is a locking pin in the VVT mechanism that can shear. When that happens upon start up this noise can happen.

Dope- it is like a diesel running but only for a few seconds.

Have a great day,
Jared
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Originally Posted by Jfornachon View Post
If you find out that it is the VVT adjuster/cam sprocket (or what ever you call it), here is the mazda part number for it. BP6D-12-4X0. Depending on the vin there will be an a,b,c, or d at the end of the number. You will have to find that out when you order it.

Have a great day,
Jared
OK, this is great information. I think that this is exactly what is going on. The VVT adjuster/cam gear whatever the big shiny round thing is that is on the end of the camshaft was moved between my two engines. Everything else is different. That is the only thing in common. Also, since my original engine only started to make this noise about 60k miles in, I think that this locking pin must have fucked up. And it sound just like a diesel.

Have you replaced one of these before? If anyone has an exploded diagram of the gear that would be great so I can see what is involved.
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Old 09-01-2010, 10:38 PM   #31
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I was told this by guy at the track who works for tripoint motors. He said that it was more common in the mazda3. But I would not doubt that the parts are very similar.

Have a great day,
Jared

Last edited by Jfornachon; 09-01-2010 at 11:20 PM. Reason: removed price
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Old 09-01-2010, 10:50 PM   #32
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Yah I saw the new parts cost. Owchie ****. I can buy a whole frikken vvt head for that much :(
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Old 09-01-2010, 11:19 PM   #33
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Yah, but if that is the issue then you will be having to deal with the noise again down the line. Just checked the mazda site and they have them in stock.

Have a great day,
Jared
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Old 09-02-2010, 12:47 AM   #34
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Very intersting. I still have my VVT head and I may just look into it to see if I can find this. Mine didn't do it all of the time though....just a handful of times.
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Old 09-02-2010, 09:10 PM   #35
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Mine just did it last night when I parked it on the street (usually in a garage) while waiting for an engine to be delivered. The car had sat out side fora good 3 hrs after sitting in the garage for a few hours as well. So the engine was cold. Last night was cold and foggy.

Just posting to keep a record of when it happened so that others may be able to recreate the problem if it is common.

Have a great day,
Jared
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