Steering - Power Steering Leak Identification

Section Title: Steering

TSB No. TS 02 10278

Division: Automotive

Category: Technical

SUBJECT:
POWER STEERING OIL LEAK IDENTIFICATION

MODEL(S):
FORENZA SEDAN/WAGON, RENO (RQ420)

YEAR:
ALL

CONDITION:

Power steering racks are being replaced with no defects.

CAUSE:

Oil leakage appears on the steering rack unit indicating there may be a leak from the steering rack.

CONDITION:





When inspecting for an oil leak at the steering rack, first check if the reservoir level is below "MIN". If it is above the "MIN" line it may not be power steering leak. Keep in mind there are several locations oil can leak from. From any one of these locations oil will travel to the lowest point in the engine compartment from gravity and/or airflow inside the engine compartment. Oil or any kind of fluid can travel along pipes and hoses, cracks and crevices. This tends to give the false indication of a leaks location. Always clean and de-grease the engine compartment and the area of the suspected leak. Then run the engine, turn the steering wheel from stop to stop 5 times. Recheck for the leak starting from the highest point in the engine compartment. Please use the information below to help find the oil leak.





1. Check the power steering fluid level with the engine OFF. If the level is below the "MIN" further inspection of the steering system is required.





2. Check the reservoir for cracks. Check hoses for leaks.





3. Check the power steering pump hose connection, front seal, pump housing for leaks.





4. Check all pipe swaging for leaks.





5. Check O-ring and jam nut thread for damage which might cause a leak.





6. Check under dust seal of input shaft. There is grease applied under the dust cover, do not mistake it for a leak. The power steering fluid is much thinner and will drip from under the cover.

7. Check hose connections at the power steering rack and pinion input shaft. If a leak is found remove fitting and make sure the fittings and O-ring are not damaged, loose, or cross threaded.





8. Check steering rack boots for fluid. This would be indicated by the boot being swollen or unusually large. The bellows will actually be hanging down lower than normal. Release the spring clip on the tie rod side and slide the clip down the tie rod. Carefully slide the boot down the tie rod toward the steering rack assembly. If fluid escapes, there is an internal leak.





9. Any area which is coated with dust is not considered a leak. Dust accumulation is most likely caused from assembly lubricant, or oil spill from passed work performed on the vehicle. (See example 1) A leak will not accumulate dust due to the fluid leak washing away dust as it accumulate. (See example 2).