That depends on how, when and where it is squealing. For example, if the brakes squeal when applied, the brake pads are probably worn down. A squeal from the engine compartment whenever the engine is running could be a loose serpentine belt (especially if the squeal changes a little when you rev the engine).
The number 5851140 on your Volkswagen engine indicates it is likely from the 1960s, specifically between 1966 and 1970. This engine number suggests it could be a type 1 or type 2 engine, commonly found in Beetles or Transporters from that era. For a precise identification, you may want to consult a detailed Volkswagen engine number guide or a vintage Volkswagen expert.
It could squeal, squeak, moan, whine, groan, and leak oil.It could squeal, squeak, moan, whine, groan, and leak oil.
If the brake pads come with shims or other anti-rattle hardware and it is not used on the vehicle, the brake pads will vibrate against the rotor as they are being applied and that will cause them to squeal.
Check all engine drive belts. Sounds like one of them is slipping.
There could be a number of reasons, but most times that has happened to me, the tires were under-inflated. Check your tires.
It could be the bearing in your tension pulley.
A Volkswagen Jetta radiator fan is controlled by a fan relay. If the relay malfunctions the fan could either stay on or not work at all. An engine diagnostic would be recommended.
That's not a serial number but rather a part number--the part number for the whole engine. It could be any year.
The crank noise in your car could be caused by issues with the engine, such as worn bearings or a faulty crankshaft. To fix it, you should have a mechanic inspect and repair the engine components causing the noise.
The engine is overheating.
Mine has done this twice, both times it was the pulleys in the front of the engine. It could also be the belts.