Can anyone identify this tapping noise?

Quote:

---

Originally Posted by josh.huber

I thought you said you already removed the injectors? They will come out again easy enough.
Compression testing through a glow plug hole is so much easier normally, most kits would have an adaptor to go through the hole.

You won't be able to visually inspect a failed injector, it'll need to be tested correctly. You could run the car and disconnect an injector one at a time. This will isolate the cylinder with the issue. Then swap the injector to a good cylinder and see if it's the cylinder or the injector that's failed.

These injectors squirt fuel multiple times for every power stroke. The first shot of fuel is the pilot shot. It's purpose is not to go bang but to raise cylinder temps and pressures for the main shot.. as injectors wear. They don't close correctly between the pilot and main and over fuel.. That fuel goes"bang" before top dead centre and causes diesel knock. In bad cases it'll crack a piston in half. It can sound metallic as it causes the engine to try and counter rotate.

---

And is exactly what I was experiencing which is why I changed all mine and it went away. For me it was only on super low load that it would knock. Thankfully no impact for the period it was knocking before I identified the issue

Quote:

---

Originally Posted by josh.huber

I thought you said you already removed the injectors? They will come out again easy enough.
Compression testing through a glow plug hole is so much easier normally, most kits would have an adaptor to go through the hole.

You won't be able to visually inspect a failed injector, it'll need to be tested correctly. You could run the car and disconnect an injector one at a time. This will isolate the cylinder with the issue. Then swap the injector to a good cylinder and see if it's the cylinder or the injector that's failed.

These injectors squirt fuel multiple times for every power stroke. The first shot of fuel is the pilot shot. It's purpose is not to go bang but to raise cylinder temps and pressures for the main shot.. as injectors wear. They don't close correctly between the pilot and main and over fuel.. That fuel goes"bang" before top dead centre and causes diesel knock. In bad cases it'll crack a piston in half. It can sound metallic as it causes the engine to try and counter rotate.

---

Thanks Josh,

Yes i have removed the injectors and have ordered another one. I'll just swap them over one at a time and see if that makes a difference .
Cheers

Quote:

---

Originally Posted by ted2910

Thanks Josh,

Yes i have removed the injectors and have ordered another one. I'll just swap them over one at a time and see if that makes a difference .
Cheers

---

Drop them with the harness first and Save yourself all the extra effort.

The problem child should get rid of the extra noise

Hi Guys,

Just an update, unfortunately it has turned out to be a spun bearing [bigsad]

My 18k car I've had for a year is now worth nothing! lots of thinking to do!

Cheers for all your input.

Ted2910

Sorry to hear this Ted. Terrible when the worst case scenario plays out.

Sad news. Are you watching Outback Discovery on YouTube? He’s going through same thing and will have a rebuilt spare 2.7 TDV6. You should get in touch. At least you have the Territory engine option especially if you’re ha day enough to do some of the toil.

Quote:

---

Originally Posted by ted2910

Hi Guys,

Just an update, unfortunately it has turned out to be a spun bearing [bigsad]

---

That is really bad news [bigsad].

How did you determine is was a spun bearing as the initial noise seemed to be more top end rather than bottom.

I hope it all works out in the end with a Territory engine.

Quote:

---

Originally Posted by ted2910

Hi Guys,

Just an update, unfortunately it has turned out to be a spun bearing [bigsad]

My 18k car I've had for a year is now worth nothing! lots of thinking to do!

Cheers for all your input.

Ted2910

---

Sorry to hear that. On the bright side, a prime candidate for a territory engine swap. If it was a 3.0l you'd be looking at a tdv8 swap....

Quote:

---

Originally Posted by Eric SDV6SE

Sorry to hear that. On the bright side, a prime candidate for a territory engine swap. If it was a 3.0l you'd be looking at a tdv8 swap....

---

If it was a 3L you’d scrap it given the cost to do the TDV8 conversion

Quote:

---

Originally Posted by ted2910

Hi Guys,

Just an update, unfortunately it has turned out to be a spun bearing [bigsad]

---

hi

sorry it is bad news

mind if ask a couple of questions?

what oil were you using and how long since the previous service ?

TIA