Di­ag­nose chirps and squeals with a stetho­scope

The Family Handyman - - CAR + GARAGE -

Ifyou want to be a real car doc­tor, you’ve got to use the right tools. An au­to­mo­tive stetho­scope (sold at any auto parts store) can be the most ef­fec­tive di­ag­nos­tic tool in your tool­box. It works just like the ones doc­tors use, al­low­ing you to “hear in­side” a me­chan­i­cal com­po­nent. The stetho­scope we chose comes with two at­tach­ments—a metal probe and a sound am­pli­fier (shown at left).

Con­nect the am­pli­fier at­tach­ment to the hose and move it around the en­gine com­part­ment. That will nar­row your search to a smaller area. Then switch to the metal probe (right photo) to lo­cate the ex­act source of the prob­lem.

Sound am­pli­fier

Metal probe Touch the scope’s metal probe to the non­ro­tat­ing part of the sus­pect com­po­nent. If it’s worn, you’ll hear an un­mis­tak­able me­tal­lic sound.

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