7MGTE knocking noise

[fatboy13]

I thought that rod knock would have come from the bottom end not up in the actual head somewhere?

Do 7Ms have rockers or not? as the noise is definately coming from the top of the motor and when i used a stethoscope it sounded like it was coming from cylinder 3.... as soon as i listened to the block i heard nothing...

not trying to argue with what this may be just hoping that more info will hopefully get the idea of rod knock out of my head....

[ed]

no they dont have rockers

and yes, rod knock definitely sounds like it comes from the head on the 7m (no idea why)

[ed]

is it worse when at a 'neutral' load point, ie not powering, not accelerating?

^^^ ???....

[fatboy13]

when not under power or acceleration the noise goes away completely... and if your just light on the throttle to stay at a speed it dissappears too....

[love ke70]

are 7m a shim over bucket type design? or...?
my 1g with stupid shim over bucket has one noisy tappet, that seems to go away at high revs. im doubting its rod knock as its a fresh motor...although maybe the blown oil pump...but no, it was always noisy
i hope

anyways, are we sure its not a shim out?

[fatboy13]

i hope so?

[mrshin]

It doesn't take that long to slip the cam covers off and have a look/measure of everything there. Also have a look and see how dirty/gummy everything is, see whether it's likely the old girl has missed a few oil changes. Otherwise, you can probably assume it to be the percussion section of the 7M's lower symphony orchestra.

If you can get someone who's had a dead 7M (or Falcon) or two before to listen to it, they should be able to tell you straight away.

[fatboy13]

yeah thats the plan for tonight... im gonna spend a couple of hours trying to hunt down the noise and narrow things down...

anyone out there killed a 7M before and wanna listen?

[WeekendWarrior]

if the noise goes away i dont think its rod knock buddy coz it will just get worse if its the bottem end . and sound does travel very easily through the motor so sometimes it hard to locate just do process of elimination from the simplest thing first

[Jin~Jah]

I wouldn't mind a listen, depending whereabouts you are...

my cressida (gte) has caught pretty bad bottom end noises from somehwere. When it wasn't as bad, it sounded like it was coming from the head, and would seem louder, or at least less muffled, when the oil cap was off.

so naturally the first thing i did was put another head on it, which of course didn't fix the main 'tapping'. It did get rid of some general noise though, becuase as it turns out the original cam journals/bearings weren't in great condition. Looks like what i presume is evidence of oil starvation.

from what i can work out, the reason it was louder with the oil cap off is becuase there's that pipe (oil return? pcv?) that runs up to just under the cap. it goes down into the block, and i reckon the sound was basically coming up the pipe

it's all good learning! (apart from the frustration and sometimes cash)

[fatboy13]

I wouldn't mind a listen, depending whereabouts you are...

Im near hornsby in Sydney if thats any help...

so im gonna pull the cam covers off tonight and hope that i find something loose or out of alignment in there.... if not then im gonna be worried.......

[Jin~Jah]

Im near hornsby in Sydney if thats any help...

so im gonna pull the cam covers off tonight and hope that i find something loose or out of alignment in there.... if not then im gonna be worried.......

i'm in north ryde, so probably 20-30mins away... not too far. can't come tonight though as it turns out, so maybe another time