Recent Topics
1st Brake Job...Not so great?
by 2civics
07/31/15 05:07 PM
Jet Pack and Router
by hatt
07/31/15 04:44 PM
'13 Subaru WRX - Rotella T6 5w40 - 3,500mi
by JettyLife
07/31/15 04:26 PM
2003 Accord K24 Castrol SynBlend 5W-20 UOA
by AccordK24
07/31/15 04:21 PM
Mazda 0w20 moly version VOA
by Voltmaster
07/31/15 04:14 PM
'10 Elantra Extended Size Oil Filter ?
by ChrisD46
07/31/15 03:25 PM
OLM on Acura??
by thorromig
07/31/15 03:14 PM
Rotella T6 Packaging, no Quart bottles??
by MI_Roger
07/31/15 03:02 PM
Car and truck differences
by mjoekingz28
07/31/15 02:33 PM
Rob Kauffman buys CGR stake
by wildcatswo
07/31/15 02:08 PM
Castrol Magantec best synthetic for the money?
by stchman
07/31/15 01:33 PM
Mirage Men
by Drew99GT
07/31/15 01:02 PM
Newest Members
calthomp, pefer, ATrain, FishyZ28, FiretoFlames
54898 Registered Users
Who's Online
88 registered (AirgunSavant, 209paulc, 901Memphis, AZjeff, 2civics, anonobomber, 11 invisible), 1616 Guests and 76 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
54898 Members
66 Forums
235181 Topics
3783720 Posts

Max Online: 2862 @ 07/07/14 03:10 PM
Donate to BITOG
Topic Options
#3444380 - 08/03/14 01:09 AM Dodge Nitro 4x4 big problem with 4WD lock!!
19jacobob93 Offline


Registered: 02/12/14
Posts: 635
Loc: Gold Coast, QL, Australia
Just went for a ride with my old man in his 2008 Nitro (same vehicle as the last Jeep Cherokee)
He stuck it in 4WD mode because he hasn't done so before and wanted to blow out the cobwebs as some 4wd systems are prone to siezing if unused
It wouldn't engage properly and made a loud whurring sound when driving coupled with a serious knocking/thudding sound when we went round a corner and the car wouldnt steer more than quarter lock! Also the car vibrated like crazy when in park or neutral.
We put it back in 2wd and it still wouldnt steer at first but after 5-10 seconds of driving it started working fine again.
This problem is only with the 4wd mode so what could it be? Is it a common problem because i cant find much doing searches online
_________________________
Car: 2000 Ford Falcon 4.0 SOHC I6 @220,000km
Oil: Valvoline Maxlife 20w50 (10k OCI)
Fuel: 95 unleaded + TCW3

Top
#3444382 - 08/03/14 01:19 AM Re: Dodge Nitro 4x4 big problem with 4WD lock!! [Re: 19jacobob93]
bvance554 Offline


Registered: 09/24/12
Posts: 1308
Loc: VA
What type of surface were you on? Pavement?

Top
#3444388 - 08/03/14 01:50 AM Re: Dodge Nitro 4x4 big problem with 4WD lock!! [Re: bvance554]
Chris142 Offline


Registered: 06/05/03
Posts: 12742
Loc: apple valley, ca
Originally Posted By: bvance554
What type of surface were you on? Pavement?
x2. not ment to be engaged on hard surfaces ....ever!
_________________________
02 Wrangler durablend 10w40
87 F250 Diesel Mystic 15w50
04 Tahoe super-s 5w30
Z400 Lucas 10w30
KLR250 Maxima 10w40
Polaris Trailblazer delo 5w40

Top
#3444393 - 08/03/14 02:47 AM Re: Dodge Nitro 4x4 big problem with 4WD lock!! [Re: bvance554]
19jacobob93 Offline


Registered: 02/12/14
Posts: 635
Loc: Gold Coast, QL, Australia
1st time we tried it was on grass, tried it again on the tarmac after and same both times. Seems like the surface wouldnt be the problem, more the 4wd system is screwed. Had other 4x4s for years doing the same thing at the same place without a problem
_________________________
Car: 2000 Ford Falcon 4.0 SOHC I6 @220,000km
Oil: Valvoline Maxlife 20w50 (10k OCI)
Fuel: 95 unleaded + TCW3

Top
#3444408 - 08/03/14 05:01 AM Re: Dodge Nitro 4x4 big problem with 4WD lock!! [Re: Chris142]
Oil Changer Offline


Registered: 08/28/06
Posts: 2297
Loc: Michigan
Really? So I have to stop using four wheel drive during my winter commuting?

Originally Posted By: Chris142
Originally Posted By: bvance554
What type of surface were you on? Pavement?
x2. not ment to be engaged on hard surfaces ....ever!

Top
#3444421 - 08/03/14 05:59 AM Re: Dodge Nitro 4x4 big problem with 4WD lock!! [Re: 19jacobob93]
Shannow Online   content


Registered: 12/12/02
Posts: 29477
Loc: a prisoner island
With the centre locked, the front and rear driveshafts are locked together. which means that the front and rear ring gears MUST turn at exactly the same time. Problem is that the tyres are all different diameters, and as you turn corners, they all turn at different speeds.

This "winds" up the drivetrain components to the limit of traction, which means that the torque on each axle, universal, clutch etc. is exactly the same as if each of the 4 wheels was doing a "burnout" (more actually, as the tyres are probably at low levels of slip, not spinning.

That's why everything feels tight...and why often, you have to back back a few metres to unwind it all before you can unlock.

The big problem is that if you do that at speed, the torque times the RPM mean that you have a thing called "circulating power"...the apparent power through the ground/tyres/diffs can be many many times that which the engine puts out (it can't pull a 4 wheel burnout, but that's the sort of power running through the drivetrain). The engine only has to provide enough power for the speed, and the frictional losses in the drivetrain...

it can and does burn out diffs, fatigue axles and CV/Universals.

If it's on gravel, snow, sand etc., then the limit of traction is very low, and the circulating power low, and that's when they are designed to be used.

Dry pavement and locked centre 4WD is a recipe for broken parts.

Top
#3444510 - 08/03/14 08:32 AM Re: Dodge Nitro 4x4 big problem with 4WD lock!! [Re: Oil Changer]
Chris142 Offline


Registered: 06/05/03
Posts: 12742
Loc: apple valley, ca
Originally Posted By: Oil Changer
Really? So I have to stop using four wheel drive during my winter commuting?

Originally Posted By: Chris142
Originally Posted By: bvance554
What type of surface were you on? Pavement?
x2. not ment to be engaged on hard surfaces ....ever!
if your winter commute consists of pavement or hard packed dirt...yes.
_________________________
02 Wrangler durablend 10w40
87 F250 Diesel Mystic 15w50
04 Tahoe super-s 5w30
Z400 Lucas 10w30
KLR250 Maxima 10w40
Polaris Trailblazer delo 5w40

Top