BENDIX TU-FLO 400-500-1000 AIR COMPRESSOR manual Leaks coolant Coolant line fittings, Noisy

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Symptom:	What it may indicate:	What you should do:

16.0 Compressor	(a)Compressor leaks air at
leaks air	connections or ports.

(b)Compressor unloader mechanism malfunction.

			(c) Damaged			compressor head
					gasket.

	Testing for leaks					Head
	with soap solution.					gasket
						location

ðCheck for leaking, damaged or defective compressor fittings, gaskets, etc. Repair or replace as necessary.

ðGo to Test 6 on page 30.

ðAn air leak at the head gasket may indicate a downstream restriction such as a freeze- up or carbon blockage and/or could indicate a defective or missing safety valve. Find blockage (go to 9.0(f) for details.) and then replace the compressor. Do not re-use the safety valve without testing. See Symptom 12.0(a).

17.0Compressor (a)Improperly installed plugs or

leaks coolant

coolant line fittings.

(b)Damaged compressor head gasket.

ðInspect for loose or over-torqued fittings. Reseal and tighten loose fittings and plugs as necessary. If overtorqued fittings and plugs have cracked ports in the head, replace the compressor.

ðAn air leak at the head gasket may indicate a downstream restriction such as a freeze- up or carbon blockage and/or could indicate a defective or missing safety valve. Find blockage (go to 9.0(f) for details.) and then replace the compressor. Do not re-use the safety valve without testing. See Symptom 12.0(a).

		(c) Porous compressor head casting.	ð If casting porosity is detected, replace the
			compressor.

	18.0 Noisy	(a)Damaged compressor.	ð Replace the compressor.
	compressor
	(Multi-cylinder
	compressors only)

Other Miscellaneous Areas to Consider

This guide attempts to cover most compressor system problems. Here are some rare sources of problems not covered in this guide:

•Turbocharger leakage. Lubricating oil from leaking turbocharger seals can enter the air compressor intake and give misleading symptoms.

•Where a compressor does not have a safety valve installed, if a partial or complete discharge line blockage has occurred, damage can occur to the connecting rod bearings. Damage of this kind may not be detected and could lead to compressor problems at a later date.

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Contents SD-01-326 General DescriptionOperation Intake and Compression LoadedCompressor & the AIR Brake System Cooling Preventive MaintenancePolyurethane Sponge Strainer Fig Removing and Installing Installation ENGINE-LUBRICATED TypesDRY Element Pleated Paper AIR Strainer FIG AIR Leakage TestsDisassembly Removing and DisassemblyConnecting ROD Assemblies Crankcase Base Plate or AdapterCrankcase Fig TU-FLO400 AIR Compressor Vertical Mount Engine LubricatedCleaning Inspection of PartsCrankcase and END Covers Inlet Valves and SeatsCylinder Bores PistonsRepairs Assembly Installing Cylinder BlockInstalling Crankshaft Pistons and Connecting RodsBaseplate Page Scheduled Maintenance InstallationTabulated Data Maintenance & Usage Guidelines Test ProceduresSymptom Number Introduction to the Air Brake Charging System Low Air Use High Air UseDiscontinue using this test Symptom What it may indicate What you should doOil Test Card Not a valid test Results Oil on the Outside of the Compressor Oil at air dryer purge/exhaust or surrounding areaOil in Supply or Service Reservoir air dryer installed MaintenanceOil in Supply Insufficient coolant flowOil in Supply or Service Reservoir Oil in ping tank Or compressor disCharge aftercooler Air brake Charging systemAir brake charging system seems slow to build pressure Releases air Compressor builds too much air Air dryer Safety valve releases air TimeLeaks coolant Coolant line fittings NoisyTest 1 Excessive Oil Leakage at Head Gasket Test 2 Air Brake System and Accessory LeakageAction Test 5 Governor Control Line Test 4 Governor MalfunctionTest 6 Compressor Unloader Leakage Page Bendix Air System Inspection Cup Basic Test Information Appendix a Information about the Basic Test Kit Bendix P/NChecklist for Technician Step B Measure the Charging System ContentsStep a Select one Is foundStep D Air Brake System Leakage Test Technical Bulletin Typical P&D, School Bus and Line HaulSystem Leakage Thawing Frozen Air Lines Page