About CHARLES HALSTEAD Expertise I CAN ANSWER ALL QUESTIONS REGARDING SYSTEM OPERATION, REPAIR PROCEDURES AND TECHNICAL ASSISTANCE WITH DIAGNOSIS. ALL RESPONSES I RELAY BACK ARE PURELY OPINIONS OF MY OWN, BASED ON EXPERIENCE,TECHNICAL INFORMATION AND KNOWLEDGE OF THE LEXUS VEHICLE PLATFORM.I AM BY NO MEANS A LINK TO THE MANUFACTURE.
Experience 30 YEARS TOYOTA EXPERENCE, WITH THE LAST 8 YEARS BEING LEXUS
Education/Credentials A1-A8 AND L1 ASE MASTER CERTIFIED.
Question The serpentine belt keeps riding off the bottom pulley and after a period of time it slices off about an 1/8" of the belts width. I have replaced the belt tensioner, and the power steering pump complete. Still having the same problem. I haven't notice any of the pulleys being out of alignment. One thing that I have observed is that the engine seems to change tunes as if its converting from a V8 to a V6 firing order and that is when the belt starts to ride off pulley. Is this a possible cause and if so, how can I correct it?
Answer IT LOOKS LIKE I MAY NEED A LITTLE MORE INFO. WHICH SIDE OF THE BELT STARTS TEARING UP? THE INNER OR THE OUTER? IF ITS THE INNER, YOU MAY WANT TO LOOK IN THE DRIVERS SIDE CAM SENSOR AREA. IF THE T-BELT HAS RECENTLY BEEN DONE, SOMETIMES THE HARNESS AND OR RETAINER TOUCHES THE
INSIDE OF THE DRIVE BELT. I WOULD CLOSELY CHECK ALL PULLEYS ON THE OUTER EDGES TO SEE IF ANY DAMAGE IS EVIDENT. ALSO JUST A SIDE NOTE. YOU MAY HAVE ANOTHER CONCERN. LEXUS V-8 MOTORS DO NOT SWITCH FROM 8 CYLINDER TO 6 CYLINDER.AND LAST, THIS MAY BE A STRETCH BUT CHECK THE CRANKSHAFT END PLAY. .0015 IS MAX. ALSO YOU MAY WANT TO CHECK ALL DRIVEN COMPONENTS FOR EXCESSIVE END PLAY. THE POWERSTEERING PUMP WILL HAVE THE MOST, WHICH IS NORMAL. BESIDES YOU HAVE ALREADY REPLACED THE PUMP ASSY.GOODLUCK
