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foggydave

Member Since: 29 Nov 2012
Location: Midlands
Posts: 263

2014 Defender 110 Puma 2.2 USW Bonatti Grey

Td5 Turbo bearing play

Hi
I was doing the perennial job of freeing off the turbo waste gate. and notice a slight bit of play on the turbo shaft. Should there be any play at all and if so how much. You can see the shaft moving side to side a bit. Its a 2001 Defender and the engine has done 70k miles. Which does not seem a lot. There is no mechanical sound from the turbo only a beautiful whistle

If I do need a new turbo have you any recomendations and also problems to be expected when fitting

Thanks

20th Apr 2015 3:26pm

Fatboy Slim

Member Since: 04 Feb 2008
Location: Bridgend
Posts: 1006

Side to side play is perfectly normal and is allowable so long as the blades of the compressor wheel don't touch the housing. It'll be straight when its spinning trust me

. Endfloat on the other hand is not allowable and worth checking for. To get an indication of carbon buildup spin the shaft with your fingers in the direction of rotation and feel how free it is, then spin it backwards. If you feel a lot of 'drag' on the backward spin start thinking about replacement in the future.

Post a video up of the play if you want and I'll take a look

20th Apr 2015 5:03pm

foggydave

Member Since: 29 Nov 2012
Location: Midlands
Posts: 263

Thanks a lot Fat Boy Slim. Thats taken a weight off my mind and wallet.
Sooooo post a video!!!! That will be a learning experience.
I have been reading up on turbos and it seems they run on a floating bearing so there is no friction at all. So there has to be a gap where the metal parts run on a film of oil I presume this why I can feel a radial movement? There is no axial movement. If I cannot get a video sorted I will check movement with dti or feeler guages and post the results.

21st Apr 2015 6:59am

foggydave

Member Since: 29 Nov 2012
Location: Midlands
Posts: 263

The side float measured on a DTI = .007" to .008" although the shaft will flex a few thou more if slight side pressure is applied. . This is probably because the bearing is located inboard of the impeller.
There is no axial movement on the DTI.
The impeller misses the casing sides by about .003" when side pressure is applied (Its difficult to measure because the inlet casing curves just after the start of the blades).
Hopefully you will be able to view a video soon
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Last edited by foggydave on 21st Apr 2015 3:20pm. Edited 1 time in total

21st Apr 2015 2:14pm

Fatboy Slim

Member Since: 04 Feb 2008
Location: Bridgend
Posts: 1006

Try it or upload to YouTube and post a link

21st Apr 2015 3:19pm

foggydave

Member Since: 29 Nov 2012
Location: Midlands
Posts: 263

YYYYYEEEESSSSSSS first utube thingy

Film is a bit fuzzy as using naf camera but bear with it and you should make out the movement

21st Apr 2015 3:47pm

Fatboy Slim

Member Since: 04 Feb 2008
Location: Bridgend
Posts: 1006

Drive her on

21st Apr 2015 6:20pm

foggydave

Member Since: 29 Nov 2012
Location: Midlands
Posts: 263

2 Big thankyou's Fatboy Slim

For putting my mind at ease with the turbo

For pointing me towards Utube and finding it so easy to upload video. Just got to get a better camera.

21st Apr 2015 7:31pm

Fatboy Slim

Member Since: 04 Feb 2008
Location: Bridgend
Posts: 1006

Excellent stuff !

21st Apr 2015 10:07pm

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