[EDD001]

Hi

Just after a bit of advice before I investigate.

I put my D40 into 4wd mode today and found that under acceleration there is a loud/rough grinding noise which appears to be coming from the O/S front wheel.

When in 2wd mode the car is fine. No noises or whines etc when driving along or under acceleration.

Are there any common problems or issues to make this happen and do you have any pointers of what to check first.

:salute: Many thanks

 

[chris vince]

Not using 4 wheel drive on a made up surface are you?

 

[freemansteve]

Well it sounds like a problem that you only get when torque is being shoved into the front wheels, so maybe driveshaft bearing, or CV joint is to blame? Just a guess....

 

[freemansteve]

Not using 4 wheel drive on a made up surface are you?

Good point - a quick way to stuff the drivetrain! (on NIssan's 1920's vintage 4WD!).

 

[EDD001]

Good point - a quick way to stuff the drivetrain! (on NIssan's 1920's vintage 4WD!).

No.

I had to tow a trailer up an off road track which was a bit muddy and the noise upon acceleration was terrible.
My thoughts are Cv joint but I'm not too familiar with 4WD systems so need as much help as poss!!

 

[chris vince]

I don't know for sure about the D40, BUT the front propshafts on D22's are notoriously weak and wear out prematurely, but you usually get a vibration on road, also have a good look at the sliding joint, it may be dry and needing grease.
The best cure is to replace the UJ's and then fit free wheel hubs, this completely stops the front prop from rotating (it will spin even in 2 wheel drive), in time though the increased MPG by reducing friction and drag, they will pay for themselves.
HOWEVER I am not sure they are made for the D40?
I have never known a Navara CV to fail, standing by ready to be corrected.
Was this noise going straight ahead or on steering lock?

 

[landmannnn]

You can't fit freewheel hubs to a D40.

In terms of the fault, there are no obvious issues which would cause a grinding in 4wd that don't appear in 2wd.

My first thought is that you may have caught a pebble in the brake caliper/shield which later fell out. Quite a common occurence when off roading.

 

[lookskyward1]

Two serious issues come to mind and will need to be investigated.

1 The transfer box has a chain drive. If the oil is low or the box has been abused by being in 4wd on a sealed surface the chain can slip causing an awful racket.

2 The front differential/axle is known to be a weak point on the D40/R51 (especially by our Antipodean cousins). A broken halfshaft or internals when used in 4wd could cause a horrible grinding noise.

Good luck and hope it is just a stone.

 

[EDD001]

Cheers guys.

Come to think of it the steering was near full lock at the time.

Hope to investigate this weekend and I'll report my findings.

 

[chris vince]

There may be your answer.
Dry steering lock stops, very well known to make horrible noises.
If so, no problem at all, the plastic nut covers are worn out, you can replace them for a couple of quid or just apply grease into the housing and onto the bolt, all will become clear when you get underneath and look at the lock stops.
I choose to grease mine.

 

[freemansteve]

If it were lock stocks, would selecting 4WD make a difference?
Or maybe he hasn't tried 2WD on full lock?

 

[chris vince]

If it were lock stocks, would selecting 4WD make a difference?
Or maybe he hasn't tried 2WD on full lock?

No but he has just said he was on full lock at the time.

 

[EDD001]

There may be your answer.
Dry steering lock stops, very well known to make horrible noises.
If so, no problem at all, the plastic nut covers are worn out, you can replace them for a couple of quid or just apply grease into the housing and onto the bolt, all will become clear when you get underneath and look at the lock stops.
I choose to grease mine.

Just took it out and fine when in a straight line and terrible when steering on lock.

Cheers mate I'll take a look.

 

[info_1885]

I have the same problem, only in 4wdrive mode, not 2wd it’s only when turning left or right. Did you find the issue? I changed the transfer case oil, no luck, think I’ll change front diff oil next. many ideas?

 

[chris vince]

Not running 4 wheel drive on hard surfaces are you?