Help Please

[RPR33]

Hey guys my sr is making a tapping noise around 2-3k it started last night when I was like 25k's from home I drove home keeping it under 3000rpms.

If it is the bearing how good are the odds that I'm gonna need a rebuild? it was still driving fine when I got home? do you think It'll be right to just change bearings?

Cheers,

Russ

[RPR33]

gay so I'm looking at a few thousand to fix? If I can talk the guys into it we'll do it at home

Edited October 4, 2008 by RPR33

[Strik3r]

are you doing the work yourself or not ? If your paying someone to do it, once you have the engine out and open, it might be worth throwing forgies and a set of rods in there.. ($2k) since you're probably going to be paying that much in labour. Put a decent head gasket in there too.

in any case, if your not gonna replace parts, get them checked out thoroughly.. i'd say your crank will need machining at the least

[R31Nismoid]

Well your looking @ 1k for motor in/out before you start.

Then, if fitting new bearings your gonna have to machine everything to suit the 4 new ones you'll have to put in etc.

So 3k would be in the ball park as you cant really just swap one bearing, you do them all and freshen it all up.

You sure its a bearing?

[RPR33]

pretty sure.. Its not something I have done before myself but a friend of mine done his in his silvia and said it sounds the same.. he's pretty in the know with these cars as he drifts and built his monstar, It seems to idle fine however if I give it a little rev it starts a knocking sound at 2-3rpms then clears up.. its a pretty loud knock very easy to here. and just sounds like it's coming from the head or front of the motor!

cheers

Russ

[R31Nismoid]

could be something in the head?

Im not up with whats inside SR heads, maybe a valve or something?

I thought a bearing knock didnt go away with RPM (as i did here a XR6t here and the knock only got louder with RPM), could well be wrong there

[shaunzo101]

If you were giving it a good thrash just before it happened, its extremely highly likely its the bearings. Perhaps just look around on forums on here and boostcruising for someone who just wants to get rid of their sr, then all you have to do is take out the old one and put in the one you buy, then you have a whole motor sitting there for spares. I know my mate could have picked up a working ca for 150 im not sure on prices for the sr. But first thing you should do before you make any moves is get advice from a qualified mechanic and go from there.

[RPR33]

yeh true I might have to toe it somewhere and have it checked... if it was a bearing would any of it come out with the oil? I'll drop the oil and see if there's any bits in there that should not be I guess..

[joeleo87]

The bearing noise would be there all the time man, there is no way that you feck a bearing and only hear it at a certain RPM.

i work with them all day lol.

[RPR33]

so maybe something in the head?

[dmr]

I thought a bearing knock didnt go away with RPM (as i did here a XR6t here and the knock only got louder with RPM), could well be wrong there

spot on.

i would get a professional to check it out before you start spending big cash.

Edited October 5, 2008 by dmr

[RPR33]

yeh I have no plans on spending cash at the moment LOL

It sounds like this.

this is not from my car but one on youtube doing the same thing.

Watta you think it is?

[super_s13]

Possibly a rocker arm. My ca was doing a similiar thing but it was the big end bearings gone. Soon after that i threw a rod. Go and get it checked from a mechanic. ust to be sure. I am not sure if the guys on here are right about the bearing noise would not go away as mine always did. As soon as i got over a certain rpm it wnt away. DR drift tunes a mates car and heard the same noise on a smaller scale up in darwin and then stopped tuning but he said it was a bearing knock and that goes away.

[Adriano]

Bearing noises can certainly come and go with different revs/load.

[RPR33]

where would that sound come from? mine seems to be coming from the top of the engine on the exhuast side!!! dam car only had it a week

[BezerkR32]

its alot more difficult to diagnose a engine noise in a full alloy block as the knock resinates through it.

best way to do it is to take load of cylinder by unplugging coil pack plug or injector harness one at a time. if noise lessens on a particular cylinder when you do this you can be pretty sure it is down stairs.

SRs are renound for this, usually because the sump has been pushed up and seals the oil pick-up. Look under the car and see if the sump is dinted.

I did a big end set in a GTIR last week, cost the guy $800. this included genuine bearings, synthetic oil & filter. Done it in the car. No probs. Only thing to check is that the crank isnt damaged. otherwise its engine out and full build.

where would that sound come from? mine seems to be coming from the top of the engine on the exhuast side!!! dam car only had it a week

[shaunzo101]

The bearing noise would be there all the time man, there is no way that you feck a bearing and only hear it at a certain RPM.

i work with them all day lol.

Well actually, i KNOW from personal experience, that in my commodore (yes its not an sr) the big end bearings went on that, and before the motor died it made a knocking sound as you increased the revs and especially under load with the sound getting greater at heavier throttle. So yes, you do hear it at a certain rpm before the motor dies of course. The big end bearings can set your motors life short instantly, over very short time or could extend over a longer period of time depending on the severity of the damage to the bearings.

[joeleo87]

yeh I have no plans on spending cash at the moment LOL

It sounds like this.

this is not from my car but one on youtube doing the same thing.

Watta you think it is?

hmm that noise is weird as hell.....

any luck with the mechanic???

[Dr_Drift]

I'd put money on big end bearing failure... don't drive the car you may do more damage to the crank or worse...

[STATUS]

do you think It'll be right to just change bearings?

Cheers,

Russ

0% chance of that, SR and RB cranks mark up even with the slightest oil film shear.