garrett t3 specs for lateral play limits?
05-16-2007, 04:03 PM
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1.0 BAR
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garrett t3 specs for lateral play limits?
Anyone know what the spec is for lateral play on journal bearing t3s? I know it's too much when the compressor turbine hits the housing, but trying to make sure it doesn't get to that point...
05-16-2007, 04:12 PM
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Re: garrett t3 specs for lateral play limits?
found it:
General tolerances - Sleeve bearings - (access the shaft from compressor air-in end) -> typical maximum shaft end play (thrust) (back and forth, not sideways) is 0.008"inch or 0.20 mm (play should NOT be noticeable using your fingertips). Shaft side play no more than 0.022" inch or 0.56 mm (very noticeable sideways movement using your fingertips). The oil pressure should self-centre the bearing within wear limits. Too much play would result in the blades rubbing the side of the housing. Look out for wear (small chips, rough edges ) on the very tips of the compressor blades that give an indication of your air filtration quality over the years, and for rub marks on the alloy turbo housing from scraping outer side blade edges. Rough tip edges should be carefully smoothed if possible.
It has been stated that approximately 40% of all turbocharger failures are oil-related. Contaminated or dirty oil leads to bearings being scratched and scored resulting in excessive wear and premature failure. Lack of lubrication due to low oil pressure to turbocharger bearings (even a momentary loss of pressure) can quickly cause overheating and damage to the bearing system.
General tolerances - Sleeve bearings - (access the shaft from compressor air-in end) -> typical maximum shaft end play (thrust) (back and forth, not sideways) is 0.008"inch or 0.20 mm (play should NOT be noticeable using your fingertips). Shaft side play no more than 0.022" inch or 0.56 mm (very noticeable sideways movement using your fingertips). The oil pressure should self-centre the bearing within wear limits. Too much play would result in the blades rubbing the side of the housing. Look out for wear (small chips, rough edges ) on the very tips of the compressor blades that give an indication of your air filtration quality over the years, and for rub marks on the alloy turbo housing from scraping outer side blade edges. Rough tip edges should be carefully smoothed if possible.
It has been stated that approximately 40% of all turbocharger failures are oil-related. Contaminated or dirty oil leads to bearings being scratched and scored resulting in excessive wear and premature failure. Lack of lubrication due to low oil pressure to turbocharger bearings (even a momentary loss of pressure) can quickly cause overheating and damage to the bearing system.
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