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rparigor(at)suffolk.lib.n
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 Posted: Mon May 21, 2007 4:17 pm Post subject: 914 Turbine clearance |
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Temporarily hung 914 for the first time this past weekend.
Turned crank a few times to keep things lubed.
I took the cap off the cold air side of the turbo to feel a new turbo. In
and out motion on the turbine was only a few thousands, but up and down
motion was ~.016" at the turbine
Pushing hard I can get the turbine to hit the housing.
If 914 owners don't mind, please measure their up and down motion and if
you can get the turbine to hit the housing and post results.
Another request is for axial and radial limits for the Rotax 914 Turbo if
someone knows.
In all fairness up and down motion should be measured on the shaft between
the hot and cold bearing, pushing just on the cold side, I suspect the
cantilevered leverage is pushing the hot side of the shaft in the opposite
direction. That said if all others have half what I do and can't get
turbine to hit housing, I think I may have a problem and further
investigation required.
My 1983 Volvo Turbo had a Garrett turbo, oil cooled only, the turbine
looked very similar and after many miles had less play than my new 914.
Could not get turbine to hit housing. I have a 1992 745 Volvo turbo with
255K miles and a Mitsubishi water cooled turbo and play is way less than
1/2 of the 914. Can't get the turbine to hit the housing.
Thx.
Ron Parigoris
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acrojim(at)cfl.rr.com
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| Posted: Tue May 22, 2007 3:37 am Post subject: 914 Turbine clearance |
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Ron
The turbo bearings are lubricated by engine oil under pressure when engine
is running. I suspect that the bearings, since the engine is new, do not
have any oil in them. I think that the bearing clearances will tighten up
once the engine is run.
If you have the 914 maintenance manual, you will find the wear limits on the
turbo in the back of the manual.
Jim Brown
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