Engine - Thumping Noise

SOURCE: Suzuki Drive Master

TITLE: Thumping Noise From Engine Compartment

APPLIES TO: Grand Vitara
XL-7

SERVICE TIP:

Problem:
Customer complains of thumping noise coming from engine compartment after vehicle had just undergone a repair that involved reinstallation or retensioning of the alternator belt.

Repair:
When the alternator belt is either reinstalled or retensioned on the H25 or H27 engines found in the Grand Vitara and the XL-7, and the belt is too tight, a thumping noise may result. In fact, when over-tightened, the sound coming from the engine may be very similar to the sound of a lower-end engine knock (in the crank or the rod). Check and adjust the tension of the alternator belt.