Noise Problem

S13- S14 Conversion · Thu Jul 12, 2007 12:12 pm

Hi Guys
I've got a serious noise comming from my engine when it reaches 2500rpm and gets worse as it revs higher. It sounds as if it's comming from the head. Am not driving enymore with it though, till I fix it up.
Do any of you know what it might be? It's on a SR20DET. I am clueless...
I had a look at the cams, but don't see anything strange there.

Vlade · Post by **Vlade** » Thu Jul 12, 2007 12:21 pm

does it sound faster than the rpm?

is a tap... (tik tik tik)... or a crrr...?

veecee · Post by **veecee** » Thu Jul 12, 2007 12:23 pm

strangely enough we had this same problem last night at the drift track.

it was an s14 with a s13 SR20det blacktop (the flat one without VVT).

it was making the strangest noise, sometimes even on idle, sounded like a tapping or knocking of some kind. it was erratic, and at times could be heard all through the rev range.

the driver thought it might be detonation, but it wasnt.

we listened to everything with a trusty long screwdriver, and found the problem on spark plug 4. when we open the plug cover, you could actually feel the tapping on top of coil 4.

we removed the coil, but the plug looked fine, that is... until we removed it. the ceramic part of the plug had loosened off of the metal part of the plug, and it was bouncing up and down on compression/decompression strokes!!!

replaced it and it was fine.

my point is - sometimes these noises can be very decieving. you need to pinpoint the noise, and tell us more about it, before we can help with diagnosing the problem!

Ero_sennin · Post by **Ero_sennin** » Thu Jul 12, 2007 12:28 pm

It could be the lifters as well.

veecee · Post by **veecee** » Thu Jul 12, 2007 12:35 pm

there are many things that it could be.

chemcool's crrrr was most decieving. it might have been lifters, it might have been the PCV (?) valve, it might have been the idler pulley, or the tensioner pulley, and in the end he had to rebuild his engine...

oh wait, that might scare the crap out of "S13- S14 Conversion".

sorry dude - but we need to narrow it down!

S13- S14 Conversion · Post by **S13- S14 Conversion** » Thu Jul 12, 2007 1:48 pm

veecee wrote:there are many things that it could be.

chemcool's crrrr was most decieving. it might have been lifters, it might have been the PCV (?) valve, it might have been the idler pulley, or the tensioner pulley, and in the end he had to rebuild his engine...

oh wait, that might scare the crap out of "S13- S14 Conversion".

sorry dude - but we need to narrow it down!

Didn't really scare me. I'm gonna do the engine anyway, from pistons, bearings etc. It sounds as if the plug problem could be it, it's also at plug no. 4. It's completely still until it reaches 2500rpm. Will have a look tonight and let you guys know. Really hope it's nothing serious, it just sound very bad. Thanks for all the advice.

S13- S14 Conversion · Post by **S13- S14 Conversion** » Thu Jul 12, 2007 1:51 pm

Vlade wrote:does it sound faster than the rpm?

is a tap... (tik tik tik)... or a crrr...?

Yes, it sounds faster than the rpm and it sounds as if it could be a crrr sound.

widowmaker · Post by **widowmaker** » Thu Jul 12, 2007 1:56 pm

its the clothes pin that you put in the spokes of your wheel

Vlade · Post by **Vlade** » Thu Jul 12, 2007 3:19 pm

bearings maybe...

If I was you... I'll check the timing belt gear check for any loose pulleys, check that you have enough oil... maybe an oil change and when doing so check for gold/copper shavings might be an indication of running bearings...

veecee · Post by **veecee** » Thu Jul 12, 2007 3:24 pm

Vlade wrote:bearings maybe...

If I was you... I'll check the timing belt gear check for any loose pulleys, check that you have enough oil... maybe an oil change and when doing so check for gold shavings might be an indication of running bearings...

at the risk of being told off for spamming...

perhaps thats the reason nissan charges so much for spares????

S13- S14 Conversion · Post by **S13- S14 Conversion** » Thu Jul 12, 2007 4:13 pm

veecee wrote:
Vlade wrote:bearings maybe...

If I was you... I'll check the timing belt gear check for any loose pulleys, check that you have enough oil... maybe an oil change and when doing so check for gold shavings might be an indication of running bearings...
at the risk of being told off for spamming...

perhaps thats the reason nissan charges so much for spares????

Ya, I think it could be made out of gold. They are crazy with their prices. If the prices would be lower they will sell more parts and then maybe make some money.

ChemCool · Post by **ChemCool** » Thu Jul 12, 2007 4:35 pm

and in the end he had to rebuild his engine...

Yes,spot on, like I am doing--- because it is krrrrr... like wasgoed pennetjie yes.Bearings!!!Dont tell me about krrssss....

Ero_sennin · Post by **Ero_sennin** » Thu Jul 12, 2007 6:15 pm

Toby · Post by **Toby** » Thu Jul 12, 2007 7:45 pm

Although, truth be told, ChemCool and Vlade and I were CONVINCED that my engine had bearing knock when we heard it, but it turns out it was a loose pulley.

Do some elimination first before assuming the worst. Take off belts to remove accessories from the equation. Rev while in neutral and car not moving to isolate drive-train noises. Open cover and remove coils and inspect plugs, etc. Even unplug one cylinder at a time to see if the noise is restricted to a specific cylinder. Remove tappet covers and inspect for damage. All of this is way easier than hauling out the engine and finding out it wasn't bearings afterall...

S13- S14 Conversion · Post by **S13- S14 Conversion** » Fri Jul 13, 2007 7:41 am

Looked at the plugs

No problem there. I listenned with screw driver and it sounds as if it may be comming from the pistons or bearings. I'm gonna take the engine out anyway to replace the pistons with Arias, so then I'll have to replace the bearings as well. If the noise is still there after that

then I give up. I'll go through eveything when I overhaul the engine.