Jeep Comanche Serpentine Belt: A Complete Guide for 1986-1992
Squealing noises from your engine bay could mean it's time for a new serpentine belt.
- Verify your engine (2.5L or 4.0L) and accessories (A/C, Power Steering) before ordering to ensure you get the correct belt.
- Squealing is the most common symptom of a failing belt, but recurring belt failure points to other issues like a bad harmonic balancer or misaligned pulleys.
- Top aftermarket brands like Gates, Continental, and Dayco are highly recommended for their quality and reliability.
- A broken serpentine belt will cause an immediate loss of power steering and charging, and will quickly lead to engine overheating.
Signs of a Failing Serpentine Belt
A worn or failing serpentine belt will almost always give you a warning. The most common sign is a loud squealing or chirping sound from the engine, especially when you first start it up on a cold or wet day. 🎬 Watch a Comanche owner diagnose and fix a noisy engine belt. As the belt wears out, you might also see cracks, fraying, or missing ribs on the belt itself. In some cases, a bad pulley bearing on one of the accessories can cause a squeal, which can be identified by checking for a pulley that is much warmer than the others after a short drive.
Don't Ignore a Bad Belt
If a serpentine belt breaks while you're driving, your Comanche will lose power steering, the alternator will stop charging the battery, and the water pump will stop circulating coolant. This can cause the engine to overheat quickly, leading to serious damage. It's a critical failure that will leave you stranded.
Choosing the Right Aftermarket Serpentine Belt
For a vehicle like the 1986-1992 Jeep Comanche, new OEM (Original Equipment Manufacturer) Mopar belts are very rare or discontinued. Fortunately, many aftermarket brands produce high-quality replacements that meet or exceed the original specifications. The most important factor is buying the correct length and rib-count for your specific engine and accessories (like A/C or power steering).
Aftermarket Brand Tiers
- Top Tier (High Quality & Reliability): Brands like Gates, Continental, and Dayco are consistently recommended by mechanics and Jeep owners for their durability and performance. They are considered OEM-quality suppliers and are a reliable choice for any Comanche. Continental was formerly known for its popular Goodyear Gatorback belts.
- Jeep Specialist (Good Quality): Crown Automotive is a well-known brand that specializes in replacement parts for Jeep vehicles. They offer a wide range of parts, including those for older models, and provide a solid, reliable option.
- Standard/Budget Tier: Brands like Skyward fall into the more budget-friendly category. While there is less specific feedback on these brands for the Comanche, they can be a suitable option for those on a tight budget. However, for a critical part like a serpentine belt, investing in a top-tier brand is often recommended for long-term peace of mind.
Pro Tip: Repeatedly breaking or shredding belts is often a sign of another problem, not a bad belt. Common causes on the Comanche include a misaligned pulley, a failing harmonic balancer, or a bad bearing in the alternator or power steering pump.
Common Ordering Mistakes
The biggest mistake is ordering a belt without confirming your Comanche's engine and accessories. The 2.5L 4-cylinder and 4.0L 6-cylinder engines use different belts. Furthermore, the belt length changes depending on whether your truck has air conditioning and/or power steering. Always verify your vehicle's specifications before ordering a new belt.
Estimated Costs
| Part/Service | Estimated Cost |
|---|---|
| New Aftermarket Serpentine Belt | $18.10 - $70.54 |
| Shop Labor | $75 - $150 |
| Total Estimated Cost | $93.10 - $220.54 |
Frequently Asked Questions (FAQ)
How often should I replace my Jeep Comanche's serpentine belt?
As a general rule, serpentine belts should be inspected regularly and replaced every 30,000 to 60,000 miles, or as soon as you notice signs of wear like cracking, glazing, or fraying. Given the age of these vehicles, proactive replacement is a smart maintenance practice.
Is replacing the serpentine belt a difficult DIY job?
For a mechanically inclined owner, replacing the serpentine belt is a feasible DIY job. It involves loosening the power steering pump to release tension, removing the old belt, routing the new one correctly, and then re-tensioning the pump. It typically takes less than an hour. 🎬 Watch this step-by-step guide to replacing your serpentine belt. However, if you are not comfortable working on your engine, a professional mechanic can do it quickly.
What is a harmonic balancer and how does it affect the belt?
The harmonic balancer is the large, heavy pulley at the bottom of the engine connected to the crankshaft. It has a rubber layer that absorbs engine vibrations. If this rubber fails, the outer ring of the pulley can wobble or slip, causing squealing noises and throwing the belt off. This is a known issue to check if you have recurring belt problems.
🎬 See how to replace a failing harmonic balancer on your Jeep.Are there any recalls for the 1986-1992 Jeep Comanche serpentine belt?
No specific recalls or Technical Service Bulletins (TSBs) were found from the National Highway Traffic Safety Administration (NHTSA) for serpentine belt issues on the 1986-1992 Jeep Comanche. Any issues are typically related to normal wear and tear or failure of related components.
Helpful Videos
Technical Specifications
OEM Part Numbers: 53002899
The key specifications are the effective length and the number of ribs (typically 6). These vary significantly based on the engine (2.5L I4 or 4.0L I6) and the presence of accessories like Air Conditioning and Power Steering.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Jeep Comanche: