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Comp Turbo Frequently Asked Questions


Comp Turbo Technology Inc Frequently asked questions page answers various common questions.

Table of Contents

Oil Feed, Drain, and Water Port sizes
Common Troubleshooting Issues
Nomenclature
CT3B
Size Comparison
Turbocharger Size Sheets

Oil Feed, Drain, and Water Port sizes

    CT2, CT3, CT4, and CT43
  • Oil feed inlet size - 1/8" NPT (Ball Bearing) 1/4" NPT (360 Series)
  • Oil drain inlet size - 1/2" NPT
  • Water Port size - 3/8" NPT
    CT5 and CT6
  • Oil feed inlet size- 1/8" NPT
  • Oil drain inlet size- 3/4" NPT

Recommended Feed Line

CT2, CT3, CT4, and CT43
    - 3 feed line
  • Ball bearing with high oil pressure
    - 4 feed line
  • Ball bearing with low oil pressure
  • Standard bearing
CT 5 & CT6
    - 4 feed line

Common Troubleshooting Checklist

Select from the list of common techincal problems and look at the list of possible causes and solutions to fix

  • Dirty air cleaner element

    Clean or replace filter element

    Collapsed or restricted air pipe before turbocharger

    Inspect pipe for damage or obstructions, replace or repair

    Restricted or damaged crossover pipe, turbo to inlet manifold

    Inspect pipe for damage or obstructions, replace or repair

    Foreign object between cleaner and turbocharger

    Inspect air intake piping, remove foreign object

    Foreign object in exhaust system (from engine, check engine)

    Inspect exhaust piping only when engine is not running and cold, remove foreign object

    Turbocharger flanges, clamp, or bolts loose

    Inspect all connecting hardware for damage ensure tight fits per installation instructions

    Inlet manifold cracked, gaskets loose or missing, connections loose

    Remove and inspect inlet manifold for damage

    Exhaust manifold cracked, burned, gasket loose, blown or missing

    Remove exhaust manifold only when engine is cold and not running and inspect for damage to castings and gaskets, replace if needed

    Turbine housing damaged or restricted

    Remove turbine housing, inspect for cracks or wear, replace if needed

    Worn journal bearing

    Rebuild required

    Excessive dirt build-up behind turbine wheel

    Inspect air cleaner element and intake piping for damage or leaks, replace if needed. Clean compressor wheel and housing

    Excessive carbon build-up on compressor housing

    Inspect crankcase ventilation system

    Fuel pump malfunction

    Refer to engine manufactures manual and replace if needed

    Worn or damaged injectors

    Inspect injectors for damage and replace if needed

    Valve timing

    Refer to engine manufactures manual and replace if needed

    Burned valves

    Refer to engine manufactures manual and replace if needed

    Worn piston rings

    Refer to engine manufactures manual and replace if needed

    Burned pistons

    Refer to engine manufactures manual and replace if needed

    Oil bath air cleaner: air inlet screen restricted / dirty air cleaner

    Replace air inlet screen

    Oil bath air cleaner: oil pull-over /oil viscosity too low or high

    Replace lubricating oil with correct grade

    Boost control malfunction: wastegate

    Inspect for damage leaks or obstructions; replace or repair if needed

    Boost control malfunction: engine management system

    Refer to engine manufactures manual and adjust as needed

  • Dirty air cleaner element

    Clean or replace filter element

    Collapsed or restricted air pipe before turbocharger

    Inspect pipe for damage or obstructions, replace or repair

    Restricted or damaged crossover pipe, turbo to inlet manifold

    Inspect pipe for damage or obstructions, replace or repair

    Foreign object between cleaner and turbocharger

    Inspect air intake piping, remove foreign object

    Foreign object in exhaust system (from engine, check engine)

    Inspect exhaust piping only when engine is not running and cold, remove foreign object

    Turbocharger flanges, clamp, or bolts loose

    Inspect all connecting hardware for damage ensure tight fits per installation instructions

    Inlet manifold cracked, gaskets loose or missing, connections loose

    Remove and inspect inlet manifold for damage

    Exhaust manifold cracked, burned, gasket loose, blown or missing

    Remove exhaust manifold only when engine is cold and not running and inspect for damage to castings and gaskets, replace if needed

    Turbine housing damaged or restricted

    Remove turbine housing, inspect for cracks or wear, replace if needed

    Worn journal bearing

    Rebuild required

    Excessive dirt build-up behind turbine wheel

    Inspect air cleaner element and intake piping for damage or leaks, replace if needed. Clean compressor wheel and housing

    Excessive carbon build-up on compressor housing

    Inspect crankcase ventilation system

    Fuel pump malfunction

    Refer to engine manufactures manual and replace if needed

    Worn or damaged injectors

    Inspect injectors for damage and replace if needed

    Valve timing

    Refer to engine manufactures manual and replace if needed

    Burned valves

    Refer to engine manufactures manual and replace if needed

    Worn piston rings

    Refer to engine manufactures manual and replace if needed

    Burned pistons

    Refer to engine manufactures manual and replace if needed

    Oil bath air cleaner: air inlet screen restricted / dirty air cleaner

    Replace air inlet screen

    Oil bath air cleaner: oil pull-over /oil viscosity too low or high

    Replace lubricating oil with correct grade

    Boost control malfunction: wastegate

    Inspect for damage leaks or obstructions; replace or repair if needed

    Boost control malfunction: engine management system

    Refer to engine manufactures manual and adjust as needed

  • Plugged crankcase breathers

    Clear obstruction per manufacturer's manual

    Turbocharger flanges, clamp, or bolts loose

    Inspect all connecting hardware for damage ensure tight fits per installation instructions

    Restricted oil drain line

    Remove and inspect oil line, remove obstruction

    Turbocharger seal leakage

    Inspect for proper oil feed / drain line installation. May require rebuild

    Worn journal bearing

    Rebuild required

    Excessive engine idle

    Refer to engine manufacturers manual and adjust as needed

    Coked or sludged center housing

    Replacement required

    Oil filter plugged

    Refer to engine manufacturers manual and replace if needed

    Oil bath air cleaner: air inlet screen restricted / dirty air cleaner

    Replace air inlet screen

    Oil bath air cleaner: oil pull-over /oil viscosity too low or high

    Replace lubricating oil with correct grade

    Boost control malfunction: wastegate

    Inspect for damage leaks or obstructions; replace or repair if needed

    Boost control malfunction: engine management system

    Refer to engine manufactures manual and adjust as needed

  • Dirty air cleaner element

    Clean or replace filter element

    Collapsed or restricted air pipe before turbocharger

    Inspect pipe for damage or obstructions, replace or repair

    Turbocharger flanges, clamp, or bolts loose

    Inspect all connecting hardware for damage ensure tight fits per installation instructions

    Inlet manifold cracked, gaskets loose or missing, connections loose

    Remove and inspect inlet manifold for damage

    Turbocharger seal leakage

    Inspect for proper oil feed / drain line installation. May require rebuild

    Excessive dirt build-up behind turbine wheel

    Inspect air cleaner element and intake piping for damage or leaks, replace if needed. Clean compressor wheel and housing

    Excessive carbon build-up on compressor housing

    Inspect crankcase ventilation system

    Excessive engine pre-oil

    Refer to engine manufacturers manual and adjust as needed

    Excessive engine idle

    Refer to engine manufacturers manual and adjust as needed

    Coked or sludged center housing

    Replacement required

    Oil filter plugged

    Refer to engine manufacturers manual and replace if needed

    Oil bath air cleaner: air inlet screen restricted / dirty air cleaner

    Replace air inlet screen

    Oil bath air cleaner: oil pull-over /oil viscosity too low or high

    Replace lubricating oil with correct grade

    Boost control malfunction: wastegate

    Inspect for damage leaks or obstructions; replace or repair if needed

    Boost control malfunction: engine management system

    Refer to engine manufactures manual and adjust as needed

  • Dirty air cleaner element

    Clean or replace filter element

    Air cleaner element missing, leaking or loose connections to turbo

    Replace, repair, or reconnect air cleaner element per manufacturer's manual

    Collapsed or restricted air pipe before turbocharger

    Inspect pipe for damage or obstructions, replace or repair

    Restricted or damaged crossover pipe, turbo to inlet manifold

    Inspect pipe for damage or obstructions, replace or repair

    Foreign object between cleaner and turbocharger

    Inspect air intake piping, remove foreign object

    Foreign object in exhaust system (from engine, check engine)

    Inspect exhaust piping only when engine is not running and cold, remove foreign object

    Turbocharger flanges, clamp, or bolts loose

    Inspect all connecting hardware for damage ensure tight fits per installation instructions

    Inlet manifold cracked, gaskets loose or missing, connections loose

    Remove and inspect inlet manifold for damage

    Exhaust manifold cracked, burned, gasket loose, blown or missing

    Remove exhaust manifold only when engine is cold and not running and inspect for damage to castings and gaskets, replace if needed

    Restricted exhaust system

    Inspect exhaust system only when engine is cold, not running, remove obstruction

    Turbine housing damaged or restricted

    Remove turbine housing, inspect for cracks or wear, replace if needed

    Worn journal bearing

    Rebuild required

    Excessive dirt build-up behind turbine wheel

    Inspect air cleaner element and intake piping for damage or leaks, replace if needed. Clean compressor wheel and housing

    Excessive carbon build-up on compressor housing

    Inspect crankcase ventilation system

    Oil bath air cleaner: air inlet screen restricted / dirty air cleaner

    Replace air inlet screen

    Oil bath air cleaner: oil pull-over /oil viscosity too low or high

    Replace lubricating oil with correct grade

    Boost control malfunction: wastegate

    Inspect for damage leaks or obstructions; replace or repair if needed

    Boost control malfunction: engine management system

    Refer to engine manufactures manual and adjust as needed

  • Dirty air cleaner element

    Clean or replace filter element

    Plugged crankcase breathers

    Clear obstruction per manufacturer's manual

    Collapsed or restricted air pipe before turbocharger

    Inspect pipe for damage or obstructions, replace or repair

    Restricted or damaged crossover pipe, turbo to inlet manifold

    Inspect pipe for damage or obstructions, replace or repair

    Foreign object between cleaner and turbocharger

    Inspect air intake piping, remove foreign object

    Turbocharger flanges, clamp, or bolts loose

    Inspect all connecting hardware for damage ensure tight fits per installation instructions

    Inlet manifold cracked, gaskets loose or missing, connections loose

    Remove and inspect inlet manifold for damage

    Restricted oil feed line

    Remove and inspect oil line, remove obstruction

    Turbocharger seal leakage

    Inspect for proper oil feed / drain line installation. May require rebuild

    Worn journal bearing

    Rebuild required

    Excessive dirt build-up behind turbine wheel

    Inspect air cleaner element and intake piping for damage or leaks, replace if needed. Clean compressor wheel and housing

    Excessive engine idle

    Refer to engine manufacturers manual and adjust as needed

    Oil filter plugged

    Refer to engine manufacturers manual and replace if needed

    Boost control malfunction: wastegate

    Inspect for damage leaks or obstructions; replace or repair if needed

    Boost control malfunction: engine management system

    Refer to engine manufactures manual and adjust as needed

  • Plugged crankcase breathers

    Clear obstruction per manufacturer's manual

    Foreign object in exhaust system (from engine, check engine)

    Inspect exhaust piping only when engine is not running and cold, remove foreign object

    Turbocharger flanges, clamp, or bolts loose

    Inspect all connecting hardware for damage ensure tight fits per installation instructions

    Restricted oil feed line

    Remove and inspect oil line, remove obstruction

    Restricted oil drain line

    Remove and inspect oil line, remove obstruction

    Turbocharger seal leakage

    Inspect for proper oil feed / drain line installation. May require rebuild

    Worn journal bearing

    Rebuild required

    Excessive carbon build-up on compressor housing

    Inspect crankcase ventilation system

    Excessive engine pre-oil

    Refer to engine manufacturers manual and adjust as needed

    Excessive engine idle

    Refer to engine manufacturers manual and adjust as needed

    Coked or sludged center housing

    Replacement required

    Oil filter plugged

    Refer to engine manufacturers manual and replace if needed

    Boost control malfunction: wastegate

    Inspect for damage leaks or obstructions; replace or repair if needed

    Boost control malfunction: engine management system

    Refer to engine manufactures manual and adjust as needed

  • Air cleaner element missing, leaking or loose connections to turbo

    Replace, repair, or reconnect air cleaner element per manufacturer's manual

    Foreign object between cleaner and turbocharger

    Inspect air intake piping, remove foreign object

    Foreign object in exhaust system (from engine, check engine)

    Inspect exhaust piping only when engine is not running and cold, remove foreign object

    Turbocharger flanges, clamp, or bolts loose

    Inspect all connecting hardware for damage ensure tight fits per installation instructions

    Oil lat at start-up

    Inspect lubrication system lines, filters, and oil for obstruction, remove obstruction

    Insufficient lubrication

    Inspect lubrication system lines, filters, and oil for obstruction, remove obstruction

    Lubricating oil contaminated with dirt or other material

    Replace all filters and lubricating oil with new per manufacturer's manual

    Improper lubricating oil type used

    Replace lubricating oil with correct grade

    Restricted oil feed line

    Remove and inspect oil line, remove obstruction

    Worn journal bearing

    Rebuild required

    Excessive dirt build-up behind turbine wheel

    Inspect air cleaner element and intake piping for damage or leaks, replace if needed. Clean compressor wheel and housing

    Excessive carbon build-up on compressor housing

    Inspect crankcase ventilation system

    Leaking oil feed line

    Remove and inspect oil line, remove obstruction

    Coked or sludged center housing

    Replacement required

    Oil filter plugged

    Refer to engine manufacturers manual and replace if needed

  • Foreign object between cleaner and turbocharger

    Inspect air intake piping, remove foreign object

    Foreign object in exhaust system (from engine, check engine)

    Inspect exhaust piping only when engine is not running and cold, remove foreign object

    Turbocharger flanges, clamp, or bolts loose

    Inspect all connecting hardware for damage ensure tight fits per installation instructions

    Oil lat at start-up

    Inspect lubrication system lines, filters, and oil for obstruction, remove obstruction

    Insufficient lubrication

    Inspect lubrication system lines, filters, and oil for obstruction, remove obstruction

    Lubricating oil contaminated with dirt or other material

    Replace all filters and lubricating oil with new per manufacturer's manual

    Improper lubricating oil type used

    Replace lubricating oil with correct grade

    Restricted oil feed line

    Remove and inspect oil line, remove obstruction

    Worn journal bearing

    Rebuild required

    Too fast acceleration at initial start

    Decrease acceleration at initial start

    Too little warm-up time

    Extend warm-up period

    Leaking oil feed line

    Remove and inspect oil line, remove obstruction

    Oil pump malfunction

    Refer to engine manufacturers manual and replace if needed

    Oil filter plugged

    Refer to engine manufacturers manual and replace if needed

    Boost control malfunction: wastegate

    Inspect for damage leaks or obstructions; replace or repair if needed

    Boost control malfunction: engine management system

    Refer to engine manufactures manual and adjust as needed

  • Air cleaner element missing, leaking or loose connections to turbo

    Replace, repair, or reconnect air cleaner element per manufacturer's manual

    Foreign object between cleaner and turbocharger

    Inspect air intake piping, remove foreign object

    Turbocharger flanges, clamp, or bolts loose

    Inspect all connecting hardware for damage ensure tight fits per installation instructions

    Worn journal bearing

    Rebuild required

    Excessive dirt build-up behind turbine wheel

    Inspect air cleaner element and intake piping for damage or leaks, replace if needed. Clean compressor wheel and housing

    Too fast acceleration at initial start

    Decrease acceleration at initial start

    Too little warm-up time

    Extend warm-up period

    Oil filter plugged

    Refer to engine manufacturers manual and replace if needed

    Boost control malfunction: wastegate

    Inspect for damage leaks or obstructions; replace or repair if needed

    Boost control malfunction: engine management system

    Refer to engine manufactures manual and adjust as needed

  • Foreign object in exhaust system (from engine, check engine)

    Inspect exhaust piping only when engine is not running and cold, remove foreign object

    Turbocharger flanges, clamp, or bolts loose

    Inspect all connecting hardware for damage ensure tight fits per installation instructions

    Turbine housing damaged or restricted

    Remove turbine housing, inspect for cracks or wear, replace if needed

    Worn journal bearing

    Rebuild required

    Excessive dirt build-up behind turbine wheel

    Inspect air cleaner element and intake piping for damage or leaks, replace if needed. Clean compressor wheel and housing

    Excessive carbon build-up on compressor housing

    Inspect crankcase ventilation system

    Coked or sludged center housing

    Replacement required

    Oil filter plugged

    Refer to engine manufacturers manual and replace if needed

    Boost control malfunction: wastegate

    Inspect for damage leaks or obstructions; replace or repair if needed

    Boost control malfunction: engine management system

    Refer to engine manufactures manual and adjust as needed

Nomenclature

Each of our turbocharger names' have been categorized by its respective housing size and wheel sizes.

Every turbo starts with the housing size then the compressor wheel size and the turbine wheel size.
CT#-####
CT# is the housing size we have CT2,3,4,43,5, and 6 sizes.
The next four numbers are the wheel sizes in millimeters.
The first two numbers are the compressor wheel size and the last two numbers are the turbine wheel size.
The compressor wheel is measured by the inducer diameter.
The turbine wheel is measured by the exducer diameter.

CT3B

CT3B stands for Comp Turbo Three Bearing, it is our Triplex Ceramic™ Ball Bearing system and it is on the seal plate on every ball bearing turbo.

Size Comparison

Our turbos are often compared with other manufactures like Garrett. Here is a chart on how each of our turbochargers matches in size with Garrett turbochargers

Comp Turbo and Garrett Equivalent Sizes

  • CT2    —  T04B, GT30, GT2860RS, GT2871R

  • CT3    —  T3/T4

  • CT4    —  GT2876R, GT3071R, GT3582R

  • CT43  —  GT3788, GT3782, GT4088, GT4094

  • CT5    —  GT4294, GT4294R, GT4202, GT4508R

  • CT6    —  GT4708, GT4708R, GT4718, GT55, GT55R

Turbocharger Size Sheets

Each picture below is a chart on the length and width of each housing and the inlet and outlet sizes

CT2 Specs  CT3 Specs  CT4 Specs

CT43 Specs  CT5 Specs  CT6 Specs

Vaccum line port for each compressor cover is 1/8" NPT