Thread: Another TDV6 Crankshaft Bearing Failure

I suspect there are two culprits for cooling issues: blocked fins from driving through mud and blocked radiator internally from not changing the coolant.

While I had the winch out for maintenance, I hosed the radiator and intercooler. I reckon I was about 30 mins waiting for it to run clear!

Originally Posted by jonesy63

I suspect there are two culprits for cooling issues: blocked fins from driving through mud and blocked radiator internally from not changing the coolant.

While I had the winch out for maintenance, I hosed the radiator and intercooler. I reckon I was about 30 mins waiting for it to run clear!

That’s interesting. I’d never considered the external aspect of it. Given I’m sure the majority of Disco owners are not dipping their vehicles, i can’t believe this is a factor. I sure you can’t make any correlation of that, forgetting causation.

Originally Posted by PerthDisco

So I wonder if roo bars and spotlights etc have a role to play?

Not sure if a radiator would get blocked internally?

Doubt it, they provide no less air flow than the standard bumper. Besides, it doesn't seem more common on ones with bull bars.

When I put my discreet winch in, I did notice the bottom of the radiators were covered in mud. I do not regularly drive through muddy water, but I was amazed at the amount that was there even in my car which is a little over 15 months old!

Originally Posted by dirvine

When I put my discreet winch in, I did notice the bottom of the radiators were covered in mud. I do not regularly drive through muddy water, but I was amazed at the amount that was there even in my car which is a little over 15 months old!

Road grime just builds up...As does bugs

Originally Posted by PerthDisco

So I wonder if roo bars and spotlights etc have a role to play?

Not sure if a radiator would get blocked internally?

The example Ward told me was external, the radiator had a mat of grass seeds on it.

Originally Posted by Russrobe

Doubt it, they provide no less air flow than the standard bumper. Besides, it doesn't seem more common on ones with bull bars.

I will have to agree to disagree,look at two vehicles,from the front, side by side,one with an ARB bar,one without(D3/4).

You will notice the airflow is definitely restricted on the vehicle with the bar,particularly down low.Then if you add large spotlights?

But,as you said,failures are not more common on vehicles with bars,and also how much the restriction affects a vehicle with a clean rad,who knows?.It would also effect the intercooler,condenser and oil cooler.

It may also only affect the vehicle when it is on its limits,that is ambients over 40 degrees,and working hard,such as pulling a large van up a long hill,Ac on,when it needs all the airflow it can get.

Slow work, in low range,in soft sand,as an example, it may not have any affect at all,due to lower airflow,little ram air .

If these vehicles are running too hot,shouldn't they go into limp mode or whatever,as the Puma will?

Land Rovers generally have very good cooling systems,they were always designed for 50 degrees ambients.

Never seen a post on here about a D3/4 overheating,ever,so maybe just an excuse by LR or whoever,for these engine failures.

The only way i would have thought it may effect crankshaft bearings,would be if the heat caused the oil to get too thin,but then surely there would be other signs on internal engine parts that this would have happened?

Originally Posted by scarry

I will have to agree to disagree,look at two vehicles,from the front, side by side,one with an ARB bar,one without(D3/4).

You will notice the airflow is definitely restricted on the vehicle with the bar,particularly down low.Then if you add large spotlights?

But,as you said,failures are not more common on vehicles with bars,and also how much the restriction affects a vehicle with a clean rad,who knows?.It would also effect the intercooler,condenser and oil cooler.

It may also only affect the vehicle when it is on its limits,that is ambients over 40 degrees,and working hard,such as pulling a large van up a long hill,Ac on,when it needs all the airflow it can get.

Slow work, in low range,in soft sand,as an example, it may not have any affect at all,due to lower airflow,little ram air .

If these vehicles are running too hot,shouldn't they go into limp mode or whatever,as the Puma will?

Land Rovers generally have very good cooling systems,they were always designed for 50 degrees ambients.

Never seen a post on here about a D3/4 overheating,ever,so maybe just an excuse by LR or whoever,for these engine failures.

The only way i would have thought it may effect crankshaft bearings,would be if the heat caused the oil to get too thin,but then surely there would be other signs on internal engine parts that this would have happened?

I was under the impression the reason the bearings spin is because the designers in their wisdom never put the locating tabs ( I am sure that's not what they are called ) on the bearings.

I read that these engines were built without those tabs , so the question has to be asked WHY.. In the pic below you can see the tab I speak of, on the left corner of the shell , which would help the shell from spinning.