Loud Clattering from the Head at Startup??
08-29-2010, 08:45 PM
#22
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.
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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09-01-2010, 02:21 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.
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.
Dopple, nice catch on the "hydrollic"
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09-01-2010, 08:54 AM
#24
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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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09-01-2010, 01:34 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
Dope- it is like a diesel running but only for a few seconds.
Have a great day,
Jared
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09-01-2010, 07:38 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
Have a great day,
Jared
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09-01-2010, 09:26 PM
#30
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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
Have a great day,
Jared
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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09-01-2010, 09:38 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
Have a great day,
Jared
Last edited by Jfornachon; 09-01-2010 at 10:20 PM. Reason: removed price
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09-01-2010, 10:19 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
Have a great day,
Jared
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09-02-2010, 08:10 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
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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11-22-2019, 08:38 AM
#36
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Hello,
Mine is also VVT engine and make the same noise as described, only sometimes. Till now I don't think its temperature related, its only on cold startup loud and for a second, then goes away.
So till now I was able to "fix" this with a different oil that I started to use but after 2 oil changes it's happening again?
Any ideas?
Best regards,
T.G
Mine is also VVT engine and make the same noise as described, only sometimes. Till now I don't think its temperature related, its only on cold startup loud and for a second, then goes away.
So till now I was able to "fix" this with a different oil that I started to use but after 2 oil changes it's happening again?
Any ideas?
Best regards,
T.G
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