Air pump seized internally
I assume you mean the idler pulley on the A/C belt. I have not replaced this particular item but it should be simple. Looking from the top of the engine compartment on the passenger side you will see the idler pulley with a mounting/locking bolt which attaches the pulley and the tension adjusting point immediately above it. Loosen the pulley locking bolt by turning counter clockwise. Relieve belt tension by turning the adjuster bolt counter clockwise. Remove the belt and pulley. Replace in the reverse order.
Because the bearing in it has worn out and it is locking up causing the belt to break.
Left hand threads clockwise to loosen
to the right of the camshaft pulley,on plastic surround is a arrow,turn cam till two small protruding edges on cam span arrow. a small arrow located on crankshaft pulley,lines up with arrow on locking tool. you need locking tool to get this right.
A bad pulley (sharp edge) A seized pulley A misaligned pulley
To remove the crank pulley on a 2002 Jaguar S-Type 4.0 V8, first, ensure the vehicle is securely raised and supported. Remove any accessories, such as the serpentine belt and any front covers obstructing access. Use a socket wrench to remove the crankshaft pulley bolt, which may require a long breaker bar for leverage. Once the bolt is removed, gently pull the crank pulley off the crankshaft using a pulley puller if needed.
To remove the crankshaft pulley from a 2000 V8 Jaguar, first disconnect the battery and remove any components obstructing access to the pulley, such as the serpentine belt. Use a suitable puller tool to grip the pulley securely, then apply force to extract it from the crankshaft. Ensure to remove any retaining bolts if applicable, and take care to mark the position of the pulley for reinstallation. Always consult the vehicle's service manual for specific torque specifications and procedures.
To remove a pulley from a shaft, you first need to loosen any set screws or locking mechanisms securing it in place. You can then use a pulley puller tool or a gear puller to apply force evenly and remove the pulley from the shaft without damaging either component. If the pulley is stuck, applying penetrating oil and gently tapping it with a mallet can help loosen it before attempting removal.
Loosen the tensioner pulley. Slide the tensioner pulley to the right. The serpentine belt will come loose. Remove the serpentine belt. Reverse the process to install the new serpentine belt.
If it keeps breaking and not just slipping off you've probably got a pulley that is locking up. You'll just have to find which one it is.....A/C, power steering, idler pulley, etc.
if you mean locking,as in the fitting of timing belt,it is a round hole,inside elongated hole,nearest the bulkhead