Turbo Grind?

pos · Apr 13, 2010

Hello,

When I switch off my engine (Disco 200 TDi) I can hear a kind of grinding / metallic whirring sound for three or four seconds. I have traced this down to the turbo. Now I am aware that the turbo requires oil pressure through the turbo housing in order for the bearing to 'exist', and this oil pressure is going to drop instantly when I turn the engine off. I am half assuming that the compressor spindle is just rubbing slightly as it winds down to a halt. There is very little play in the spindle (less than 1.5mm) in any direction and the turbo boosts without halt. The compressor vanes have not touched the compressor housing and I can spin the compressor freely.

Does any one else's engine / turbo do this? Or have I got a problem?
Cheers
-Pos

The Mad Hat Man · Apr 13, 2010

yu do allow the turbo to spool down for a minute or two before turning off the engine - dont ya?

pos · Apr 13, 2010

The Mad Hat Man said:
yu do allow the turbo to spool down for a minute or two before turning off the engine - dont ya?

For about 10 seconds yeah. It doesn't make any difference

-Pos

juiceyv8 · Apr 13, 2010

pos said:
For about 10 seconds yeah. It doesn't make any difference

-Pos

yea it does. the bearings will be getting no lubrication.......

keep doing this and the bearings will give up.

Shifty1962 · Apr 13, 2010

Let the motor idle for at least a minute or preferably two before you switch it off. At idle the turbo will have little or no inertia so will stop spinning virtually instantly. If you've been giving it some welly let it idle for five minutes or so before you turn it off because the oil flow will be cooling the hot turbo vanes and bearings as well as killing the turbine speed. Some turbos are capable of spinning at more than 50,000 rpm and it takes longer than you think for the thing to slow down. Take off your inlet pipe and watch the compressor vanes turning to get an idea.

Just a thought - does the 200 tdi have a centifugal oil filter? On my TD5 you can hear the filter rotor spinning for about 30 seconds when the engine is turned off.

pos · Apr 13, 2010

juiceyv8 said:
yea it does. the bearings will be getting no lubrication.......

keep doing this and the bearings will give up.

By that I meant that it doesn't make the slightest difference whether or not I turn the engine off after 10 seconds or 2 minutes.

-Pos

pos · Apr 13, 2010

Shifty1962 said:
Let the motor idle for at least a minute or preferably two before you switch it off. At idle the turbo will have little or no inertia so will stop spinning virtually instantly. If you've been giving it some welly let it idle for five minutes or so before you turn it off because the oil flow will be cooling the hot turbo vanes and bearings as well as killing the turbine speed. Some turbos are capable of spinning at more than 50,000 rpm and it takes longer than you think for the thing to slow down. Take off your inlet pipe and watch the compressor vanes turning to get an idea.

Just a thought - does the 200 tdi have a centifugal oil filter? On my TD5 you can hear the filter rotor spinning for about 30 seconds when the engine is turned off.

I've never known anyone leave a 200TDi (or any other land rover engine) to idle for a minute or longer before they turn it off

I will try it tomorrow to see if it makes any difference, I can understand the logic behind it. The sound is definitely intake related, it becomes very obvious with the intake hose removed. It only seems to happen when the engine is warm.

-Pos

GRATCH · Apr 13, 2010

is it rubbing on the exhaust side of the turbo? this would resonate through to the intake side

Turbo Grind?

pos

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The Mad Hat Man

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pos

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juiceyv8

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Shifty1962

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pos

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pos

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GRATCH

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