Mercury LN7 Serpentine/Drive Belt Replacement at your home or office.

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Serpentine/Drive Belt Replacement Estimate for Mercury LN7

Mercury LN7 Serpentine/Drive Belt Replacement costs $149 on average.

CarServiceEstimateShop/Dealer Price
1983 Mercury LN7L4-1.6LService typeSerpentine/Drive Belt ReplacementEstimate$214.75Shop/Dealer Price$255.84 - $351.21
1982 Mercury LN7L4-1.6LService typeSerpentine/Drive Belt ReplacementEstimate$194.75Shop/Dealer Price$235.86 - $331.24
Show example Mercury LN7 Serpentine/Drive Belt Replacement prices

Serpentine/Drive Belt Replacement Service

What is a serpentine belt and how does it work?

A serpentine belt is a relatively long, flat, multi-ribbed belt that is driven by the engine’s crankshaft pulley. The belt drives many, and often all, of the engine accessories such as the alternator, air conditioning compressor, power steering pump, water pump, and air pump. The serpentine belt is tensioned by a hydraulic or spring-loaded automatic tensioner. Some older cars use a serpentine belt to drive most accessories but will also have a shorter v-style belt to drive, for example, the power steering pump.

Belts

When to consider replacing the serpentine belt:

  • Regularly scheduled maintenance. Typically, belt manufacturers recommend belt replacement at 90,000 miles. However, the belt must be inspected for wear or damage at regular intervals prior to this high mileage.
  • Squealing noise, belt slippage, visible belt damage. Should the belt fail or wear out prematurely, you may hear noise or you may see visible signs of deterioration such as missing chunks of rubber, excessive cracking, or a shredded appearance on the edge of the belt.
  • Battery Light. A loose belt, perhaps caused by a defective tensioner, may not drive the alternator at adequate speed and thus the battery may discharge, causing the warning light to illuminate.
  • Engine overheating. Often, the serpentine belt drives the water pump. In those applications, if the belt breaks the engine will overheat in seconds to minutes. If the belt is inadequately tensioned, you may notice higher-than-normal engine operating temperature.

How do mechanics replace the serpentine belt?

  • Prior to removing the belt, the mechanic must run the engine to determine if the idler pulley and the belt tensioner are noise-free. Those rotating components have grease filled bearings and are subject to wear. In addition, the mechanic will ensure that all pulleys and accessories are turning in the same plane. These steps help make sure your new belt will operate trouble-free for its full-service life.
  • The belt’s routing path through the various components is noted. The belt tensioner is released, usually with a wrench or lever, to release the tension from the belt. With the tension off, the belt slides off the pulleys.
  • All rotating components — that is the alternator, air conditioner compressor, etc. — are checked for smooth operation and no noise.
  • If everything checks out, the new belt is slipped over all of the pulleys while holding the tensioner away from the belt. Once the belt is centered on all pulleys, the tensioner is released and the installation is complete. The engine is run to ensure normal operation.

Is it safe to drive with a serpentine belt problem?

No. Should the belt have visible damage, you risk unexpected and sudden breakage that could potentially leave you stranded. Serpentine belt problems that result in the alternator not charging may cause the battery to discharge, which will result in loss of electrical power to the vehicle. Additionally, if a deteriorated belt breaks and that belt drives the water pump, the engine will overheat in a matter of seconds.

When replacing the serpentine belt keep in mind:

  • On many cars, the expected service life of a serpentine belt is around 90,000 miles. Should the belt fail well prior to that, a very careful inspection should be performed to check for out-of-alignment pulleys, a possibly out-of-position crankshaft harmonic balancer on which the drive pulley is mounted, binding pulleys, or a defective belt tensioner.
  • Attention should always be given to serpentine belt routing, since proper routing is critical to proper belt tension, and function of the driven components.
  • Sometimes it is difficult to distinguish serpentine belt related noise from other engine noises. In these cases, a mechanic will determine the origin of the noise by momentarily running the engine without the serpentine belt attached.

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Meet some of our expert Mercury mechanics

Real customer reviews from Mercury owners like you.

Excellent Rating

(50)

Rating Summary
43
4
2
0
1
43
4
2
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1

Richard

21 years of experience
461 reviews
Richard
21 years of experience
Mercury Milan L4-2.3L - Serpentine/Drive Belt - Fairburn, Georgia
Professional, on time and efficient

Eric

14 years of experience
73 reviews
Eric
14 years of experience
Mercury Mountaineer V8-5.0L - Serpentine/Drive Belt - Atlanta, Georgia
Was was very disappointed in Eric, Although he did a good job at replacing my Serpentine belt and the pulley, but he unexpectedly didn't replace the drive tensioner, which was the enitenial problem. Instead he keep the part. After he finished the work, he only left the old Serpentine drive Belt he replaced. And took all the other parts with him. I supplied my own parts, the the drive Tensioner came with the pulley already attached, so if he replaced all my parts like he said, then why did he find it necessary to take my old drive Tensioner and old pulley with him. I never laid eyes on it; to even see how badly it was damaged. You can clearly see on the engine that the tensioner was never replaced, only the pulley and the belt. I reported this with yourmechanic.com and I'm waiting for them to get back with me, once they finish looking into it.

Torrieanto

12 years of experience
632 reviews
Torrieanto
12 years of experience
Mercury Mountaineer V8-5.0L - Serpentine/Drive Belt Replacement - Tampa, Florida
Torrieanto always does great work!

Fred

17 years of experience
389 reviews
Fred
17 years of experience
Mercury Villager V6-3.3L - Serpentine/Drive Belt Replacement - Spring, Texas

Excellent Rating

(50)

Rating Summary
43
4
2
0
1
43
4
2
0
1
Number of Mercury Serpentine/Drive Belt Replacement services completed
550+
services done by our mechanics
TOTAL NUMBER OF EXPERT Mercury MECHANICS
600+
experts on our platform

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