The engine stops immediately and if you are driving you also loose your Power Steering and power brakes making it difficult to steer off the road and stopping requires very hard pushing on the brake pedal. But you just grip and brake safely off the road if possible. If you try to start the engine with your key, it will just have a fast whirring noise as the starter freewheels because it is no longer connected to the belt and thus to the engine. Depending on the make, you will have to replace just the belt (and they will recommend to replace the water pump as well because it is in close proximity to the TB repair work and you save some in duplicated labor. Your call on this). This is $300-1000. If you are unlucky and have damaged pistons, valves, cylinder head or pushrods as well, your expense will obviously be substantially more. Good luck. If it is not yet broken, have it replaced pretty close to the mfg recommendations. You are playing with fate if you elect not to do it until it breaks. Inconvenience, bad location, on the road, potential greater expense. You have to make the call. If you don't have the bread, drive easy and pray until you can have it done. Will it break at 97K or last to 190k? You might Google that question and play the odds.
No , the 5.0 liter V8 engine in a 1998 Mercury Mountaineer has ( 1 ) timing CHAIN
Timing chain.
In the 1998 Mercury Mountaineer : The 4.0 liter SOHC - V6 engine has ( 3 ) timing CHAINS The 5.0 liter V8 engine has ( 1 ) timing CHAIN
You can check on eBay.
On a 2002 Mercury Mountaineer : The 4.6 liter V8 engine uses ( 2 timing CHAINS / 1 CHAIN to each cylinder head )
only when it begins to fail.
chain
locate timing chain guides.
The 5.0 litre / 302 cubic inch V8 used in a 1999 Mercury Mountaineer has a timing CHAIN
The 4.0 liter SOHC , V6 , has ( 3 ) timing chains and the 5.0 liter V8 has ( 1 ) timing chain , if that's what you are asking ?
It will quit running if it breaks. That's the most common failure of a timing belt. It may run poorly and backfire if it slips or jumps a cog.
To set the timing on a 1997 Mercury Mountaineer with a 5.0 engine, you'll need a timing light tool. Connect the timing light to the battery and number one spark plug wire, then start the engine and point the timing light at the timing marks on the crankshaft pulley and timing cover. Adjust the timing by loosening the distributor hold-down bolt and rotating the distributor until the timing marks align with the correct specification, then tighten the bolt and recheck the timing.