Evo 4 - Whining Sound

Hi Guys,

Just got my 4 back yesterday with a recon 6 engine and gearbox in and it is running sweet as a nut.

One thing that it was doing before i sent it in for the work and now still is, was that there is a whining sound coming from somwhere in the transmission. So i'm assuming that it could be from one of the driveshafts, a wheel brearing, front or rear dif or something to do with the AYC, prop shaft or the transfer box. Coz it can't be the gear box, because its just been changed.

The noise starts to come on at about 30 mph to 40 mph, thats when it does it the most quietly and thats with no gears engaged, so in neatural or with my foot on the clutch. Or if i'm going about 70 mph and then brake quickly again with no transmisson engaged, its make the same noise but loader.

Just a bit worried if this could be fatel or if I take it easy, which I am because I'm running my new engine in, will it be ok till I get what ever it is sorted.

I've just gone through all my service history from when I bought the car and for a start it doesn't look like any of the other transmission fluids have been changed apart from the brand new oil in the gear box and engine.

Any idea's - Thanks for looking.

Ollie

hey ollie thats good you got your car back on the road?

as for the noise does it get worse if you go to a turn to the left or right
ie if it does get worse turning to the right it could be the o/s/f wheel bearing if the noise is generly there all the time once above say 30 mph it could be the rear as the noise stays with rear wheel bearings.

let us know how u get on bud.

ross

Thanks Ross,

But it doesn't make any diference when turning. I took that car for a spin and wet uo 100mph on the moter way. Now its hardly noticable aaceleration, it just when you slow dowm, thats when it gets worse. Almost sounds likes a polices surron when its load!!

Help, any more help with be thanked bit time.

Cheers Again,
Ollie

oh right ollie cool if i can think of anything i will let you know asap bud does the noise change when braking?

ross

1982ollie said:

Help, any more help with be thanked bit time.
Cheers Again,
Ollie

Click to expand...

From what you have described in your original post Ollie, I would have draw the conclusion that there is an issue with your read dif buddy.

The best way to eliminate all the other components is to get your car to KwikFit and have them check the bearings, which might well be the issue, they will put it on a ramp and check it for free.

Once those are eliminated then you are left with the dif which I think is the culprit.

Have it checked out as advised and get back to us right here buddy.

El

Thanks El,

Otherwise it is running lovely, with no overboosting that good. My old engine could of been over boosting for god knows how long and that could of coursed the issue with my old engine in the first place.

I'll see what I can find out - Even if the dif is on its way out, will it be ok to drive gently for now.

Do you think relacing the oils in the dif's may make a difference.

Cheers,
Ollie

as explained, it seems more like the rear diff whining.
change the oil it should be ok. if not then run it & change it again after a few miles.

not much to worry about. worst case change the rear diff as you got a stronger engine & box now'

Any ideas on how you change the dif oil - It sounds like it is coming from the centre of the car underneath, also another thing, the whine isn;t as bad when throttleing slowly or just holding it there. But then if you break hard, it almost sounds like one of those old Police sirrens, (whether you are in gear or not, thats when breaking of course) if you catch my drift.

Anymore idea's would be much thanked!!!

Ollie K

there is a drain plug under the rear diff.
think 24mm size.
a re-fill plug 17mm on top facing the gearbox.

drain & re-fill.

worth checking the transfer box oil aswell'

I'm going to change all the oils in the transfer box and both dif's - That way I know the right oil is in them and its new good proper oil. Is the transfer box fairly easy to get to, to change the oil.

As it is coming from the centre of the car, surly it must be the front dif or the transfer box?

Is oilman the best guy to get oil from for these sorts of things?

Cheers Guys.

Ollie

Oil man is kind of cheap or should I say competitive. When you factor in the delivery charges, it does make sense to buy of them but their good deals are mostly based around events etc.

Give them a try, you might score!!!

You need to create a log in on their site to get the member discounts. Let me know what they are asking for their oils and I will see what I can do for you too.

Take the car to KwikFit like I said and get the car checked out, you will at least narrow it down to the root cause. At the same time I will stress that I always change all oils and fluids whenever I get a car regardless of what the service book is telling me unless I have worked on the car myself in the past.

Stamps are easy to come by and a mate of a mate will always be happy to oblige

El

Cheers El - I can't thank you enough for your help and advise - Shall I ask oil man what oils I need because when it comes to tranmission oils, I don't have a clue.

Thanks again buddy.

Also mate - Don't forget those Gauges I was asking you about becuase I have been paid now and I want to get some of those asap. I'm going to give the turbo timer a miss for now becuase In going to get a clifford G5 with remote start and a timer relay. So that will act as my turbo timer if I ever need it. As it happens I always drive very slow for the last 2-4 miles of my trip and then I leave the car ticking over with my in it for about 30 secs.

Cheers again Buddy.

75w90 will see you right.

Just remember that the turbo will need a slightly longer time down when you have been on a long journey or when the car is being booted around under heavy boost.

I will email you some pics on Wednesday as I will be tied down tomorrow. You never know, their might be some awesome goodies arriving in tomorrows shipment

El

Thanks El!!!

Guys,

When changing this oil in the difs, the gear oil that is, this has nothing to do with touching anything on the AYC system does it???

Cheers
Ollie

Guys,

I'm having this done this evening peps, just wanted to check that just changing the gear oil in both dif's doesn't have anything to do with the AYC system.

Also is changing the front dif/transfer box oil very similar to changed the rear dif oil. Just one bolt on the bottom to drain and one on top to re fill.

Cheers,
Ollie

the AYC system is seperate & a different fluid is used.
i wouldnt mess around with that unless its playing up.

the gearbox/diff/transfer oils are easy to change. one drain plug & filler plug.
messy & smelly tho'
have fun -

Thank you Mr Lancer!!

Mr Lancer forgot to tell ya that the AYC drainer is also on the rear dif so make sure you ain't draining that pal! You will end up with loads of agro if that happens.

The dif oil side is the one facing the rear of the car and that is the one you wonna change. The AYC fluid side is the one facing the gearbox, if you get what i mean???

Good luck pal

Guys,

Sent my car to Mitsubishi to change my Dif oils and its a lot quieter - They said the oil that came out the front Dif was thick and silver, and it was basically the wrong oil in there.

While I was there a got them to change the AYC fluid because that was looking pretty old and mankey. Also had my oil and filter changed.

Running sweet now.

Cheers