whining help please....

[richy79]

hi there

i have recently bought a 1999 mitsubishi evo6 gsr and when i picked up the car i noticed a whining/squealing noise over 5krpm under full load in every gear.

i sprayed some wd40 on the aux belt and it goes away for a few minutes but comes back again it dont do it in neutral.

ive changed the belt, tensioner and idler and still there.

the water pump was changed just before i bought the car (prob cus of this noise) it has the a/c pump, p.a.s pump, dampened crank pulley and alternator left to change, theres no play or roughnes in any of the bearings and ok at low revs.

hepl please anyone

[curtis73]

The ghetto answer (and the one that I'd employ) is to just let it go. The worst that will happen is that accessory will eventually lock up and die and make itself obvious

My guess is that something is interfering with the belt or a pulley. Just revving it in neutral doesn't torque the engine in its mounts. My guess is that when you're putting it under load, the engine is rocking over allowing the pulley or belt to contact a shroud, accessory, A/C box, something.

[zagrot]

that sounds like a pulley alignment problem or belt tension. by the way, never spray a belt or tire with WD40 since it weakens rubber. insted get a spray bottle and spray the belt with water while it is running, if the squeel gets loud and then quiets after a while the belt tension is low, if the squeel gets quite and then loud later the pulleys are misaligned -- one is offset from the others; lateraly misaligned i believe. it could also be a bad bearing, but the water test will not cause a change in the noise if that is the case. and as always if the belt is cracked, frayed, oil saturated, or badly glazed it should be replaced.