Weird Knock?not Sure?

[ru3-29T]

on a start up there is a weird knock in my motor when its warm it goes away.its kinda a yuk and scary noise..i will start my car in the morning and get this weird knock rattle noise at idle which is scary..anyone have the same noise and what it is..my car has only 80klms on the clock..any ideas cheers fellas

[insu]

Most likely you are describing lifter noise.

Read this: http://en.wikipedia.org/wiki/Hydraulic_lifters

"Frequently, the valvetrain rattles loudly on startup due to oil draining from the lifters when the vehicle is parked. This is not considered significant provided the noise disappears within a couple of minutes, although typically it usually only lasts a second or two"

Normally I would be wary of what is on wikipedia, but this information looks to be fairly correct.

Try using a thinner oil, that should help the noise to go away faster.

[(B1) MR_fanny]

i doubt it will be lifters if the noise sounds so bad that it concerns you. as for lifters my mate wacked some additives made for sticky lifters which has reduced the ticking noise dramatically.

oh yeah my other mate and his wrx had something similar. loud as ffff rattle turned out to be one of his timing belt pulleys shearing/wobbling itself off. luckily we picked it up in time before it completely fell off. have a look =)

Edited November 9, 2006 by (B1) MR_fanny

[mid life crisis]

can the rockers be adjusted on a rb25 at all as my sons car has some lifter noise if not any idea on how much a set of lifters is worth ?

cheers

[sh@un]

Lifters (or hydraulic lash-adjusters as they are more correctly known on, non-RB26, DOHC powered 'Lines) don't 'knock', the sound they make is more of a sharp 'ticking' noise if they are low on oil pressure (thats your valves hitting the seats more harshly).

A dull knocking is likely to be more serious. Just get a mechanic to have a listen with a diagnostic stethescope.

[sh@un]

can the rockers be adjusted on a rb25 at all as my sons car has some lifter noise if not any idea on how much a set of lifters is worth ?

cheers

RB20/25/26's don't have rockers (unlike SR20/RB30/L-series engines), the cam lobe acts directly on the lash-adjuster, which controls the valve opening/closing.

Engine oil flush may clean up the supply galleries and make them run quieter, but if your son is prone to thrashing the car, they will often sound tappety as they "pump up" with high oil pressure and increase the valve clearances.

Become a member of the club and give Lincorp spares a call if you want to purchase new ones.

Cheers

[ru3-29T]

yeah its a bit weird.it deffanatly has some thing to do with oil i hink..when i rev it off idle the noise goes straight away which im guessing cause if the oil pressure build up.its deffenatly a knock not a tick if you no the diffrence between the noises..its deffanatly not normal and never use to happen..ill try a good flush and maybe get a good mechanics view on it..any one recomnd any places around the parramatta area..cheers guys

[Dazzler22]

yeah its a bit weird.it deffanatly has some thing to do with oil i hink..when i rev it off idle the noise goes straight away which im guessing cause if the oil pressure build up.its deffenatly a knock not a tick if you no the diffrence between the noises..its deffanatly not normal and never use to happen..ill try a good flush and maybe get a good mechanics view on it..any one recomnd any places around the parramatta area..cheers guys

What was the result of this?

Cheers

Dazzzler