New Engine Installed - Whats This New Noise ?

[Guilt-Toy]

I just got my new fully forged bottom end running yesterday and the car sounds like it has a supercharger on it and you can hear this really high pitched whine comming from the engine.

The engine runs fine appart from running around 10 - 15deg higher then normal.

Anyone got anyideas why it would make the sound and why would it run hotter? the gauge in the dash reads normal readings its just the PFC that is saying it sitting on 101deg/c

[R31 POWER]

Maybe idler bearing? I gave my mate my ones off a spare RB20det and it whined back. Sounds like a fuxed power steering pump but different.

[mad082]

the running temp of the engine may be due to the thermostat that is in there.

[rev210]

the whine would most likely be a bearing noise.

[Bobjones]

I would also say idler bearing which should have been changed with all the other bearings for the timing set when the engine was done anyway....

[Eug]

could be something as simple as the timing belt

[gtst4d]

If you have done a new timming belt it could be that, mine did the same and it turns out it was to tight and we just backed it of a little and the noise went away, and some belts are noiser than others.

[Beer Baron]

are you using a gates timing belt by any chance?

[Guilt-Toy]

Yep. Gates NEO

  Beer Baron said:

are you using a gates timing belt by any chance?

[mad082]

gates belts are noisey.

[Al]

If the engine has been rebuilt, wouldn't everything be tight, thus have more friction, thus runs hotter?

But 101degC sounds way too high

[Beer Baron]

  Guilt-Toy said:

Yep. Gates NEO

I haven't personally used a gates belt, but they have a bit of a rep for being quite noisy. I have heard a few cars with them, and yes they were noisy. It's quite possible though that it is just not being tensioned properly. were the tensioner and idler bearings replaced or checked?

[gun32gtr]

i have a gates belt on my gtr and yes it is little noiser than the stock one that was on it

[Guilt-Toy]

yeah its a new belt and it is on pretty tight. I noticed today that its not as loud as it was yesterday.

might slacken it off a bit and see.

[Devils_Advocate21]

running a tad high there my freshly rebuilt engine doesnt see over 81 deg on pfc id get that checked

[DVS JEZ]

get a long screw driver and carefully put it on the water pump housing, or the alternator or the powersteer pump, with your ear on the other end, if they all sound normal then your belt or tensioners may be noisy

cheers

Jeremy

[Eug]

eug the e-mechanic wins again!

[dangerman4]

gates timing belts are crap. Do not use them...

I installed one with the new idler/tensioner bearing's.

after about a week i had this really weird noise at idle coming from the front end.

after 6 months it was getting really annoying so i

did the screw driver trick, and the most noise was coming from the cas.

chucked a spare cas on and no change, so i removed the timing cover and instead of the blue gates belt i found a black gates belt. i was puzzled by this so i stripped the balancer, lower cover, etc off and found all the blue crap from the belt was now coating my new idler and tensioner pulley.

the coating that they put on the outside of there belts is useless.

removed both pulleys and hit them with the wire wheel on the cordless, and came up good as new.

replaced with a genuine nissan belt and havent heard a single noise since.

So the moral of the story is,

stick with genuine.

Cheers

[Guilt-Toy]

Genuine ey ?? I dont think Nissan know what a RB30DET is my last belt was gates and had no issues with it.. I think the belt is a bit tight

[dead32]

i use a gates belt on my car, never once has been noisey. prob overtensioned as the others have said. p.s the blue does flake off my i doubt that was the noice, id say you overtensioned your belt also causing the belt to overstretch and strip the blue *gates* off.