The secondary air system is designed to enable catalytic converter to heat up and reach its operating temperature more quickly after a cold start.
Principle of operation
Due to extra mixture enrichment during cold-start phase, an increased amount of unburnt hydrocarbons is carried in exhaust gas. The secondary air system improves the afterburning (oxidation) process in the catalytic converter, and in this way reduces toxic emissions. Heat generated by oxidation accelerates "light off" of catalytic converter and significantly improves exhaust gas quality during warm-up.
Showing posts with label cylinder head. Show all posts
Showing posts with label cylinder head. Show all posts
Monday, November 1, 2010
Audi A6 C5 4.2L V8 5V BAS Secondary Air Injection Maintenance
10:19 PM by onesecond
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Labels: 2l, air injection, Audi, audi a6, bas, catalytic converter, cold start, cylinder head, engine control module, exhaust gas, gas quality, inlet valve, mixture, oxidation process, ports, principle, toxic emissions, unburnt hydrocarbons, vacuum
Labels: 2l, air injection, Audi, audi a6, bas, catalytic converter, cold start, cylinder head, engine control module, exhaust gas, gas quality, inlet valve, mixture, oxidation process, ports, principle, toxic emissions, unburnt hydrocarbons, vacuum
Wednesday, June 9, 2010
1988-1995 Chevy V8 305 & 350 TBI Airaid Intake System Installation
5:29 AM by onesecond
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Labels: air cleaner, air intake, airaid intake system, bolt, bores, breather tube, Chevrolet, chevy v8, crankcase, crankcase breather, cylinder head, dipstick tube, hold down, mounting bracket, PDF Download, side fender, stud, studs, throttle body, valve cover
Labels: air cleaner, air intake, airaid intake system, bolt, bores, breather tube, Chevrolet, chevy v8, crankcase, crankcase breather, cylinder head, dipstick tube, hold down, mounting bracket, PDF Download, side fender, stud, studs, throttle body, valve cover
Remove Factory Intake Assembly
a) Loosen the wing on the top of the factory air intake assembly and remove assembly from vehicle.
b) Remove and discard the 1” crankcase breather ring. See Fig#1 (save valve cover breather tube for later use)
c) Use a 13mm socket and wrench to remove the strap that secures the silencer tube on the passenger side fender housing. See Fig#2
d) Remove entire factory air cleaner assembly from vehicle.
a) Loosen the wing on the top of the factory air intake assembly and remove assembly from vehicle.
b) Remove and discard the 1” crankcase breather ring. See Fig#1 (save valve cover breather tube for later use)
c) Use a 13mm socket and wrench to remove the strap that secures the silencer tube on the passenger side fender housing. See Fig#2
d) Remove entire factory air cleaner assembly from vehicle.
Thursday, June 3, 2010
2001-2008 Mazda Tribute 3.0L Chamshaft Ticking Noise Service Bulletin
2:44 AM by onesecond
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Labels: 0l, cam lobes, camshaft, caution, conventional diagnostics, customer concern, cylinder head, intake cam, left bank, mazda, mazda tribute, pulley, stethoscope, valve cover, vins, warranty, water pump
Labels: 0l, cam lobes, camshaft, caution, conventional diagnostics, customer concern, cylinder head, intake cam, left bank, mazda, mazda tribute, pulley, stethoscope, valve cover, vins, warranty, water pump
This bulletin supersedes the previous bulletin 01-032/06, issued on 10/12/2006. The APPLICABLE MODEL(S)/ VINS, DESCRIPTION, REPAIR PROCEDURE, and WARRANTY INFORMATION have been revised. Some vehicles equipped with a 3.0L engine may exhibit a ticking noise from the left bank cylinder head while the engine is running at normal operating temperature. Customers having this concern should have their vehicle repaired using the following repair procedure. Use the table below to select the correct repair for the applicable model.
Monday, May 24, 2010
1989-1996 Dodge Dakota Trucks Ignition Coil Tests
8:17 PM by onesecond
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Labels: air injection, carbonization, coil tester, coil wire, coolant, coolant temperature sensor, cylinder head, dakota trucks, Dodge, dodge dakota, engine cylinder, hdc, ldc, mounting bracket, ohmmeter, resistance, secondary coil, thermostat, v8, visibility
Labels: air injection, carbonization, coil tester, coil wire, coolant, coolant temperature sensor, cylinder head, dakota trucks, Dodge, dodge dakota, engine cylinder, hdc, ldc, mounting bracket, ohmmeter, resistance, secondary coil, thermostat, v8, visibility
The ignition coil for the vehicles covered by this guide is in the following locations:
• 1989-92 engines: mounted to the firewall
• 1993-96 2.5L engines: mounted on the thermostat housing in front of the coolant temperature sensor
• 1993-96 V6 and V8 LDC engines: mounted to a bracket bolted to the right engine cylinder head
• 1993-96 5.9L HDC engines: mounted to a bracket bolted to the air injection pump (AIR pump) mounting bracket.
• 1989-92 engines: mounted to the firewall
• 1993-96 2.5L engines: mounted on the thermostat housing in front of the coolant temperature sensor
• 1993-96 V6 and V8 LDC engines: mounted to a bracket bolted to the right engine cylinder head
• 1993-96 5.9L HDC engines: mounted to a bracket bolted to the air injection pump (AIR pump) mounting bracket.
Sunday, May 16, 2010
1999 Mercedes Benz Truck ML 430 Air Injection Pump Operation
11:59 PM by onesecond
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Labels: 163, air cleaner, air hose, air injection, clutch, cylinder head, electrical diagrams, electrical plug, electromagnetic clutch, fuel injection, fuel pump, fuel pump relay, fuse, ground cable, location model, Mercedes Benz, mercedes benz truck, ml 430, starter relay, voltage supply
Labels: 163, air cleaner, air hose, air injection, clutch, cylinder head, electrical diagrams, electrical plug, electromagnetic clutch, fuel injection, fuel pump, fuel pump relay, fuse, ground cable, location model, Mercedes Benz, mercedes benz truck, ml 430, starter relay, voltage supply
M33 AIR pump Engine 104, 111, 112, 113, 119, 137,166: When actuating, the voltage supply of the engine is performed via the air injection relay. Engine 104, 120: When actuating, the electromagnetic clutch air pump is actuated by force. Work instructions NOTE: Trim panel of cylinder head cover or air cleaner take off. Bolt (5) unscrew Refer to Air Pump NOTE: Pay attention to ground cable. 5/1 Air hose detach. M33
Thursday, February 25, 2010
Alfa 156 2.0 TSpark Timing Belt Replacement
9:07 PM by onesecond
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Labels: alfa 156, Alfa Romeo, anto, camshaft, crank shaft, crankshaft, cylinder head, dial gauge, ignition coils, locking tools, plug hole, prfiles, pulley, spark plug, special tools, sprocket, timing belt installation, timing belt replacement, timing belt tensioner, whell
Labels: alfa 156, Alfa Romeo, anto, camshaft, crank shaft, crankshaft, cylinder head, dial gauge, ignition coils, locking tools, plug hole, prfiles, pulley, spark plug, special tools, sprocket, timing belt installation, timing belt replacement, timing belt tensioner, whell
Special Tools
Camshaft locking tools – Alfa Romeo No.1.825.041.000
Inlet camshaft holding tool – Alfa Romeo No.1.822.155.000
Exhaust camshaft holding tool – Alfa Romeo No.1.822.146.000
Timing Belt tensioning tool – Alfa Romeo No.1.822.149.000
Balancer shaft belt tensioning tool – Alfa Romeo No.1.822.154.000
Special Precautions
Disconnect battery earth lead
DO NOT turn crackshaft or camshaft when timing belt removed
Remove spark plugs to ease turning engine
Turn engine in normal direction of rotation
DO NOT turn engine via camshaft or other sprockets
Observe all tightening torques.
Camshaft locking tools – Alfa Romeo No.1.825.041.000
Inlet camshaft holding tool – Alfa Romeo No.1.822.155.000
Exhaust camshaft holding tool – Alfa Romeo No.1.822.146.000
Timing Belt tensioning tool – Alfa Romeo No.1.822.149.000
Balancer shaft belt tensioning tool – Alfa Romeo No.1.822.154.000
Special Precautions
Disconnect battery earth lead
DO NOT turn crackshaft or camshaft when timing belt removed
Remove spark plugs to ease turning engine
Turn engine in normal direction of rotation
DO NOT turn engine via camshaft or other sprockets
Observe all tightening torques.
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