Re: Turbo cool down

Posted by Burnie on March 23, 2006 at 02:30:32 from (58.164.180.142):

In Reply to: Re: Turbo cool down posted by NC Wayne on March 22, 2006 at 22:45:41:

I've never seen a melted turbo. What I have seen are hair-line cracks in turbines caused by uneven cooling. A turbine is thin walled, but of varying thicknesses that cool at different rates which may cause cracks to form if the turbo is frequently shut down a very high temperatures. However the bearings and seals usually fail due to poor lubrication, before the cracked turbine has a chance to fly apart. A turbo will take less time to reach idle speed from max RPM if the engine is idling, as the slower air flow has a braking action on the turbine. You will not get this effect if the engine is shut down. Tractors that have been worked in the field, should be idled for 2-3 minutes to ensure that the turbo is running as slow and as cool as possible before shut-down. This will prevent premature cracking of the turbine and bearing wear/failure.

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