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loud noise coming from 300 tdi engine


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#1 defender-kris

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Posted 15 June 2011 - 03:50 PM

Hi lads - need some help!

Bought a 300 tdi defender with the engine making a loud noise. the owner said the bottom end had gone.

A friend of mine came over today and has now put doubt in my mind that the bottom end has not gone.

When the engine is running there is a lot of white smoke coming from the exhaust.

When I cracked the injectors off it made the engine run differently apart from when I cracked injector no.3 off.

It ran the same, so my mate said he thought it was the piston. Is this a common fault with 300 tdi's?

I dont know if this would have anything to do with it but it has run on red diesel its whole life.

How much work is involved in fitting a new piston?

Any help will be very much appreciated!!

Thanks, Kris.

#2 Retroanaconda

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Posted 15 June 2011 - 04:16 PM

Before you pull the engine apart, swap injector 3 with another one and see if the cylinder where cracking the nuts off doesn't affect the running moves with it.

If it does move with it, it points to that injector being at fault. If it doesn't, then it's likely a problem with cylinder 3.

If it's been run on red, I'd be looking at finding a way of proving as such if you intend to run it on white for road use in the future. In case you get dipped, they will be able to tell that there has been red in the system.

#3 Tanuki

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Posted 15 June 2011 - 05:27 PM

Sounds like #3 cylinder is not firing properly (the white smoke being unburned fuel).

Do a compression-test: if #3 is down on pressure you know to look at valves/pistons (or possibly a cracked head?)

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#4 defender-kris

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Posted 15 June 2011 - 07:15 PM

thanks lad i have tryed swapping injector and it dose the same thing

#5 Retroanaconda

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Posted 15 June 2011 - 07:22 PM

You say it does the same thing, did the 'problem cylinder' move with the injector?

Ie. if you swapped injector #3 with #2 then does the engine note now change on all cylinders except number 2, or is it still all except number 3?

#6 defender-kris

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Posted 15 June 2011 - 07:27 PM

all in 3 mate

#7 Retroanaconda

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Posted 15 June 2011 - 07:31 PM

So the problem most likely lies with cylinder 3. A compression test is next as Tanuki quite rightly says :)

#8 discomikey

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Posted 15 June 2011 - 09:48 PM

compression test then whip the head off for a quick gander, its not too complicated to whip the head off in TDI's

just hope that the bore is not damaged.
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#9 Les Henson

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Posted 16 June 2011 - 06:04 AM

You can change a piston with the engine still in the vehicle (no ladder frame in the way). Head off, sump off, undo the bearing cap, shove the piston/conrod out the top.


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#10 defender-kris

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Posted 16 June 2011 - 04:23 PM

bad new bottom end gone the shells are in a bad way i have got a spare
300 tdi with a head gone time to make one out of two more work :(

#11 saxosportsaxo

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Posted 16 June 2011 - 07:31 PM

Can you check the valve clearances?




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