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NOISE, VIBRATION, AND HARSHNESS (NVH) TROUBLESHOOTING EM-79 [VG33E and VG33ER] C D E F G H I J K L M A EM NVH TROUBLESHOOTING CHART — ENGINE NOISE Use the chart below to help you find the cause of the symptom. 1. Locate the area where noise occurs. 2. Confirm the type of noise. 3. Specify the operating condition of engine. 4. Check specified noise source. If necessary, repair or replace these parts. A: Closely related B: Related C: Sometimes related —: Not related Location of noise Type of noise Operating condition of engine Source of noise Check item Reference page Be re wa rm -u p A fte r wa rm- u p W en st ar ting W e n id g W a ci ng W ile d riv in g Top of Ticking or C A — A B — Tappet Hydraulic valve lifter Rattle C A — A B C Camshaft Camshaft journal clearance Crank- Slap or — A — B B — Piston pin Piston and piston pin clearance Slap or rap A — — B B A Piston slap Piston-to-bore clearance Knock A B C B B B Connect- Connecting rod bushing clearance Knock A B — A B C Main bear- Main bearing oil clearance Timing belt Whine or C A — A A — Timing belt Loose timing belt Clatter A B — C A — Timing belt Front of Squeak- A B — B — C Other Drive belts deflection Creaking A B A B A B Other Idler pulley bearing operation Squall A B — B A B Water Water pump operation |