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I supported Toymods
Location:
NY
Registered:
May 2002
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Why is my head knocking?
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Wed, 26 January 2005 02:22
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Well it sounds like it is comong from the head...... I have a 20v silver top, there is this remote knocking noise in the head (or so it seems) around the 2-3000 rpm mark.
Has anyone had this prob, if so what was it, could it be the VVt pully or a loose/bent/sticking valve?
PLEASE help me here i am pulling my hair out trying to sus this one out.
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Location:
Brisbane
Registered:
October 2002
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Re: Why is my head knocking?
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Wed, 26 January 2005 02:37
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does it run rough or differently to normal
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I supported Toymods
Location:
NY
Registered:
May 2002
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Re: Why is my head knocking?
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Wed, 26 January 2005 03:09
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feels like it is losing compression, i can drive it but the output is alot less
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Location:
Melbourne
Registered:
January 2005
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Re: Why is my head knocking?
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Wed, 26 January 2005 07:31
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Maybe oil problem???? u got good oil pressure?
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I supported Toymods
Location:
NY
Registered:
May 2002
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Re: Why is my head knocking?
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Wed, 26 January 2005 10:34
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not sure at this point, i am assuming a valve at the moment
is there any way that i can check valve probs??
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: Why is my head knocking?
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Wed, 26 January 2005 11:30
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lemme see....
remove rocker cover and turn over the motor and see what happens..
i also vaguely remember a number of threads froma few years ago saying that the VVT actuator caused similar noises and lack of power.. might be worth a google..
Cya, Stewart
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I supported Toymods
Location:
NY
Registered:
May 2002
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Re: Why is my head knocking?
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Wed, 26 January 2005 14:55
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turn the motor over with the rocker cover off???? the motor wont crank, or am i just out to see what happens? do i do this with the spark plug leds connected??
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: Why is my head knocking?
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Wed, 26 January 2005 22:19
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take off rocker cover, turn motor over with.. a spanner, ie BY HAND... so you can turn it little by little and verify that the valves and cams are ok..
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Location:
Melbourne
Registered:
May 2002
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Re: Why is my head knocking?
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Wed, 26 January 2005 23:18
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How frequent is the knocking? Does it do it when you start the car for a moment?
I have heard similar things, it sounds like its comming from the head, but its turned out the be the bottom end bearings.
When i have heard this at idle car sounds normal, and about 3000rpm you can start to hear the knocking and when the motor is trying to start.
Cheers Adam
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I supported Toymods
Location:
NY
Registered:
May 2002
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Re: Why is my head knocking?
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Thu, 27 January 2005 00:39
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ok well i will try what you suggested 'oldrolla', thanks for that one.
Fattony: the noise starts when i hit the gas and at about 2500- 3300 (or so) then it is not so bad. how do i tell if it is bottom end bearings? If it is how do i replace them ones, isn't it a case of matching pairs to the block?? that will be a fun one right?
thanks for all the help peoples.
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I supported Toymods
Location:
NY
Registered:
May 2002
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Re: Why is my head knocking?
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Thu, 27 January 2005 00:42
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ok well i will try what you suggested 'oldrolla', thanks for that one.
Fattony: the noise starts when i hit the gas and at about 2500- 3300 (or so) then it is not so bad. how do i tell if it is bottom end bearings? If it is how do i replace them ones, isn't it a case of matching pairs to the block?? that will be a fun one right?
thanks for all the help peoples.
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I supported Toymods
Location:
NY
Registered:
May 2002
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Location:
On your mum!
Registered:
May 2002
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Re: Why is my head knocking?
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Thu, 27 January 2005 02:22
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Like Fattony has said - It may well be that a big end bearing has carked it. If this has happened the piston can hit the cylinder head.
How do you find it? Drain the oil and pour it through a sieve. If there is any coppery white metal things then it is stuf-fed.
Solution = motor rebuild or another import.
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I supported Toymods
Location:
NY
Registered:
May 2002
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Re: Why is my head knocking?
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Thu, 27 January 2005 02:43
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we replaced the bottom end bearings with ones out of another 20v block, they were all good so that may be it, but i still doubt it.
i know about draining the sump part, the last 2 motors were bottom enders and they were totally f*$%ed
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Location:
Melbourne
Registered:
May 2002
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Re: Why is my head knocking?
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Thu, 27 January 2005 23:11
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U can take of the sump and pull the lower part of the bearing and inspect it from there.
PS have fun, if it is your better of just getting another motor cause it would prob cost just about as much.
Cheers Adam
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I supported Toymods
Location:
NY
Registered:
May 2002
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Re: Why is my head knocking?
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Sun, 30 January 2005 14:33
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that is what i am thinking eh mate, but yeah, looks like a slow rebuider eh
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Location:
QLD, Gold Coast
Registered:
February 2004
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Re: Why is my head knocking?
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Mon, 31 January 2005 00:12
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Thats exactly what happened to mine as well, bearings come off and my cylinders startered to knock and yep, engine rebuild, and yeah slow rebuild, about 4 months to date.
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Location:
Arthurs Creek, Victoria
Registered:
May 2002
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Re: Why is my head knocking?
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Mon, 31 January 2005 04:52
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If your heads knocking, why don't you just answer it?? 
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Location:
Castle Hill, Sydney
Registered:
February 2004
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Re: Why is my head knocking?
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Mon, 31 January 2005 07:28
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who's there?
i've seen the same thing on a few cars, a tick tick at idle that gets faster with the revs. never thought it would be something as serious as a bearing!
better do the oil drain test!
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Location:
Castle Hill, Sydney
Registered:
February 2004
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Re: Why is my head knocking?
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Mon, 31 January 2005 07:29
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who's there?
i've seen the same thing on a friends car, i couldnt figure out what it was, a tick tick at idle that gets faster with the revs. never thought it would be something as serious as a bearing!
his car would only do it sometimes though, fine one day, ticky the next, better tell him to drain his oil and puit it through a sieve
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Location:
Arthurs Creek, Victoria
Registered:
May 2002
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Re: Why is my head knocking?
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Mon, 31 January 2005 08:34
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AH, no the tick tick that comes from a head that increases with idle, but doesn't sound that bad is the valves. Either not getting enough oil, or having a big of slap in them.
Common in e* falcons
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Re: Why is my head knocking?