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  #1  
Old March 25th, 2015, 03:10 PM
Roverlab
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Turbo question

I have a customer's 109 in the shop with a 200TDi.
My knowledge base on TDi's is increasing, and I realise there is always something new to be learned.
My question: how much play should be considered excessive on the impeller? With the inlet hose off of the turbo, I can move the impeller up and down with my finger tip at least an 1/8" +. The leading edge of the vanes look worn, not "crisp". There is oily residue in the inlet hose, and on slight inclines, in 5th and even 4th, the engine feels flat.

The customer has also complained of a lack of power in general, but especially cold. The timing is spot on.

The Rover is a S3 109 with rack, boxes, tent, weight, ie: aerodynamically challenged, but I'm not sure that is the entire issue!

Thoughts?
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  #2  
Old March 25th, 2015, 03:23 PM
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I thought there was a limit in the Land Rover manual somewhere, but can't see it.

Google says 0.020" limit lateral play and 0.004" axial. 1/8" is huge. Measure with a dail gauge.
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Old March 25th, 2015, 03:33 PM
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You should be able to move it but not that much

Start the engine and let it heat up a bit. Shut it off and make sure its not spinning and then check it while there is still hot oil in the turbo housing. There should be little to no movement then.

I tested mine this way and found the turbo to be bad. if the blades are looking chewed up a bit then its going. Oil in the tube usually means the turbo is going. Its coming out of the bearing.
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  #4  
Old March 25th, 2015, 03:42 PM
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As to lack of power. You need to check the boost profile with a gauge. Boost can be low if the fueling is not high enough, or a leaking wastegate or a bad turbo. 90% of the time I see lack of fueling as the root cause.
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Old March 25th, 2015, 03:50 PM
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Thanks! Adding instruments as well.....
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Old March 25th, 2015, 03:53 PM
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As a shop, it is worth your time to put together a boost gauge and line setup that can tee into the boost sense line for road testing. That and a tinytach.
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Old March 25th, 2015, 04:47 PM
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Tee'd in a Blue Point Pressure/Vacuum hand pump.
Test run just now gave me about 11psi at wide open throttle under load, low vehicle speed such as when accelerating from a stop.
Approach an incline around 40mph and the boost will reach 10 psi even as the engine begins to feel flat.
Needle on test gauge fluctuates rapidly within about .5 psi whether at 5psi or 10 psi of boost. Stable at idle.
Pressure applied to wastegate causes movement around 10-11psi, full travel by 23psi.
Do not have EGT or tach info.
Going to make 1/4 turn adjustments to the smoke screw tomorrow.
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Old March 25th, 2015, 04:50 PM
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Then boost is perfectly fine. Any idea what RPM the boost is starting and peaking?

Check timing?

Check fuel supply? Fuel filter and lift pump.
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Old March 25th, 2015, 04:52 PM
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Quote:
Originally Posted by Roverlab View Post
Tee'd in a Blue Point Pressure/Vacuum hand pump.
Test run just now gave me about 11psi at wide open throttle under load, low vehicle speed such as when accelerating from a stop.
Approach an incline around 40mph and the boost will reach 10 psi even as the engine begins to feel flat.
Needle on test gauge fluctuates rapidly within about .5 psi whether at 5psi or 10 psi of boost. Stable at idle.
Pressure applied to wastegate causes movement around 10-11psi,
The book number is 12 psi, so you could add a bit on the wastegate, but that is doubtfully the problem.
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Old March 25th, 2015, 04:55 PM
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two different problems:

1. excessive turbo shaft play: rebuild or say goodbye to your turbo.
2. low on power: no idea.

----

My "car talk" back of the envelope guess is a boost leak somewhere. Theory: The compressor is able to hit the pressure required but is way out of its efficient range due to the leak.
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Old March 25th, 2015, 04:55 PM
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Timing checked out when we had the timing cover off last fall. Will recheck when I can get back into the building- non-running Rovers have taken over the shop space.
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  #12  
Old March 26th, 2015, 05:17 PM
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So the rains never materialized, allowing for some refreshing outside work at 64*.
Removed the cover over the diaphragm and turned it clockwise 90*. Made a huge difference in overall performance, and not horribly smoky at 10 psi boost. Going to install egt, tach and boost gauges anyway, so I'll have hard numbers to back up the "feel" of an improvement soon...
Thanks all!
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