Turbocharger Diagnostic 101 Used and New, what to do and what NOT to do....
11-03-2003, 06:01 PM
#1
at the jetties fishin'
Thread Starter
Turbocharger Diagnostic 101 Used and New, what to do and what NOT to do....
hopefully, this will help a few people out....
Foreign Object Damage
Foreign object damage is caused by foreign materials entering the turbine/compressor housing and impacting the turbine or compressor wheel. This leads to a lost of efficiency and unbalance rotation, ultimately resulting in turbo failure.
Caused by:
Foreign objects such as screws, nuts, and bolts entering the compressor housing as a result of negligence. Debris from damaged air filters. Debris from exhaust manifold, cracked turbine housing, engine valve and piston impacting the turbine wheel. Traditional use by honda-tech members to use stuff like screen door screens and/or cheese cloth as "air filters" for their turbonetics filters
Lubrication-Related
(A) Dirt In Oil
Foreign materials in oil, metal shavings, abrasives from inadequate filtration and dilution can score the bearings and destroy the oil film that supports rotor. Dirty oil damages the turbocharger with heavy scoring of critical bearing surfaces. Improper type oil useage can also damage bearing surfaces due to breakdown of the oil at high operating temperatures.
Caused by:
Blocked, damaged or poor quality oil filter. Dirt introduced during servicing. Engine wear or manufacturing debris. Malfunctioning of oil filter bypass valve.
Poor quality oil carbonizing in service. Breakdown of oil at high shaft speeds during operation.
(B) Insufficient Lubrication
Turbocharger rotor operates at high speed on very thin film of oil. Loss of this oil film for a repetitive short duration of 4-5 sec can lead to metal-to-metal contact, wheel-to-housing rub and turbocharger failure (due mainly to compressor rate of 55,000 rpm at about 5,500rpm of nominal engine speed). Should be evident the damage this can do and how quickly.
Caused by:
Kinked/ restricted/ broken oil feed pipes.
Low/ no oil levels. Oil pump failures. Blocked oil filters. Long period of non use (storage for winter...priming should always be done after storage). Oil contamination. Coked bearing housing. Failure to crank the engine after oil filter change. Failure of MANY a turbo novice to properly rotate a center section so that the oil drain is facing DOWN instead of another direction so that oil can properly flow OUT of the turbocharger instead of sitting super-heated after engine shutdown and coking.
Results in:
Heat discolouration on shaft. Polishing and scoring on critical surfaces such as journal/thrust bearing. Excessive bearing play on turbine shaft which leads to turbine wheel/housing contact.
Extreme Temperature
Extreme turbo temperatures are caused by excessive exhaust temperatures and can damage turbo during operation or shutdown.
Caused by:
Excessive exhaust temperature due to injection pump modifications to over deliver fuel.
Excessive oil temperature. Non-approved turbine housing causing excessive rotation speed. Carbonizing due to poor oil quality. Repeated hot shutdown. Excessive Lean engine condition during high load applications.
Results in:
Erosion of the turbine wheel. Cracked turbine inlet flange/ wall. Blockage at oil drain cavity of bearing housing. Deformation of turbine housing. Total housing failure. Heat-lock of shaft bearings.
Foreign Object Damage
Foreign object damage is caused by foreign materials entering the turbine/compressor housing and impacting the turbine or compressor wheel. This leads to a lost of efficiency and unbalance rotation, ultimately resulting in turbo failure.
Caused by:
Foreign objects such as screws, nuts, and bolts entering the compressor housing as a result of negligence. Debris from damaged air filters. Debris from exhaust manifold, cracked turbine housing, engine valve and piston impacting the turbine wheel. Traditional use by honda-tech members to use stuff like screen door screens and/or cheese cloth as "air filters" for their turbonetics filters
Lubrication-Related
(A) Dirt In Oil
Foreign materials in oil, metal shavings, abrasives from inadequate filtration and dilution can score the bearings and destroy the oil film that supports rotor. Dirty oil damages the turbocharger with heavy scoring of critical bearing surfaces. Improper type oil useage can also damage bearing surfaces due to breakdown of the oil at high operating temperatures.
Caused by:
Blocked, damaged or poor quality oil filter. Dirt introduced during servicing. Engine wear or manufacturing debris. Malfunctioning of oil filter bypass valve.
Poor quality oil carbonizing in service. Breakdown of oil at high shaft speeds during operation.
(B) Insufficient Lubrication
Turbocharger rotor operates at high speed on very thin film of oil. Loss of this oil film for a repetitive short duration of 4-5 sec can lead to metal-to-metal contact, wheel-to-housing rub and turbocharger failure (due mainly to compressor rate of 55,000 rpm at about 5,500rpm of nominal engine speed). Should be evident the damage this can do and how quickly.
Caused by:
Kinked/ restricted/ broken oil feed pipes.
Low/ no oil levels. Oil pump failures. Blocked oil filters. Long period of non use (storage for winter...priming should always be done after storage). Oil contamination. Coked bearing housing. Failure to crank the engine after oil filter change. Failure of MANY a turbo novice to properly rotate a center section so that the oil drain is facing DOWN instead of another direction so that oil can properly flow OUT of the turbocharger instead of sitting super-heated after engine shutdown and coking.
Results in:
Heat discolouration on shaft. Polishing and scoring on critical surfaces such as journal/thrust bearing. Excessive bearing play on turbine shaft which leads to turbine wheel/housing contact.
Extreme Temperature
Extreme turbo temperatures are caused by excessive exhaust temperatures and can damage turbo during operation or shutdown.
Caused by:
Excessive exhaust temperature due to injection pump modifications to over deliver fuel.
Excessive oil temperature. Non-approved turbine housing causing excessive rotation speed. Carbonizing due to poor oil quality. Repeated hot shutdown. Excessive Lean engine condition during high load applications.
Results in:
Erosion of the turbine wheel. Cracked turbine inlet flange/ wall. Blockage at oil drain cavity of bearing housing. Deformation of turbine housing. Total housing failure. Heat-lock of shaft bearings.
11-03-2003, 07:31 PM
#4
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Re: Turbocharger Diagnostic 101 Used and New, what to do and what NOT to do.... (newgsrdriver)
dont forget not to stick your finger in your turbos compressor inlet.. that's a good tip.
heheh
heheh
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