Mitsubishi Eclipse Engine Water Pump Guide (2000-2012)
Understanding the critical role of your Eclipse's water pump and why it's a job you can't afford to ignore.
- Always replace the water pump at the same time as the timing belt to prevent catastrophic engine failure and save on labor costs.
- Do not ignore symptoms like leaks or overheating; a failed pump can destroy your Eclipse's engine.
- Choose a high-quality aftermarket brand like Gates, GMB, or Aisin for this labor-intensive job; it is not a part to save money on.
- The job is complex and not recommended for beginner DIY mechanics due to the risk of incorrect timing belt installation.
Is Your Eclipse's Water Pump Failing?
A bad water pump will give you clear warning signs. Ignoring them can lead to a much bigger repair bill. Look out for these symptoms:
- Coolant Leaks: This is the most common sign. You may see puddles of green or red fluid under the front-center of your car. Leaks often start at the pump's "weep hole," which is designed to show when the internal seal is failing.
- Engine Overheating: If the temperature gauge climbs into the red, the pump may not be circulating coolant properly. Pull over immediately if you see the temperature spike or steam from the engine to prevent permanent damage.
- Whining or Grinding Noises: A high-pitched whine or a grinding sound from the front of the engine often points to a worn-out bearing inside the water pump.
- Wobbly Pulley: If you can access the front of the pump (with the engine off), check the pulley for any looseness. A failing bearing will cause it to wobble.
A Note on Leaks from Mitsubishi
Mitsubishi issued a Technical Service Bulletin (TSB-19-14-001) explaining that minor staining or coolant residue around the water pump's weep hole can be normal due to steam escaping. However, if you see active drips or a significant trail of dried coolant, the pump needs to be replaced.
Choosing the Right Aftermarket Water Pump
Because replacing the water pump on an Eclipse is labor-intensive, choosing a quality part is essential. You don't want to do this job twice. Here’s a breakdown of available aftermarket brands.
The Golden Rule: Replace with the Timing Belt
The single most important piece of advice for any 2000-2012 Eclipse owner is to replace the water pump whenever you replace the timing belt. The timing belt replacement interval is between 60,000 and 100,000 miles. Since 90% of the labor is the same for both jobs, replacing them together saves you hundreds of dollars and prevents a future pump failure 🎬 Watch: Step-by-step timing belt and pump replacement for 4th-gen models. from destroying your engine.
Tier 1: OEM Quality or Better
These brands are known for their reliability and are often used by professional mechanics. Many are original equipment suppliers to automakers.
- Gates: A highly respected brand, often sold in complete timing belt kits that include the water pump. A very safe and reliable choice.
- GMB: A major manufacturer that produces water pumps for many car brands directly. They are known for quality that meets or exceeds OEM specs.
- Aisin: A top-tier Japanese manufacturer and an OEM supplier for Mitsubishi. An Aisin pump is often considered equivalent to buying the part from a Mitsubishi dealer.
Tier 2: Reliable Aftermarket Options
These brands offer a good balance of quality and price, making them solid choices for most owners.
- Dayco: Similar to Gates, Dayco is a well-known name in belts and cooling components, often bundled in kits.
- ACDelco: A trusted brand with a long history of producing reliable replacement parts.
- Beck Arnley: Focuses on sourcing parts that match the original form, fit, and function for import vehicles.
Tier 3: Budget-Friendly
These brands meet basic requirements and can be a solution if budget is the primary concern. However, for a labor-intensive job like this, investing in a higher-tier brand is strongly recommended.
- US Motor Works
- Graf
- Airtex
Cost to Replace a Mitsubishi Eclipse Water Pump
The cost is dominated by labor because the pump is difficult to access. The estimates below assume the water pump, timing belt, and tensioner are all replaced at the same time, which is the standard and recommended procedure.
| Part/Service | Estimated Cost |
|---|---|
| Shop Labor | $400 - $600 |
| New Aftermarket Water Pump & Timing Kit | $150 - $300 |
| New OEM Water Pump & Timing Kit | $450 - $700+ |
| Total Professional Job | $650 - $1,300+ |
Frequently Asked Questions
Is replacing the Eclipse water pump a DIY job?
For most people, no. This is an advanced repair rated 4 out of 5 for difficulty. It requires removing an engine mount, serpentine belts, the crankshaft pulley, and multiple timing covers. Mistakes during reassembly, especially with the timing belt, can destroy the engine. This job is best left to an experienced DIYer or a professional mechanic.
What happens if the water pump fails while driving?
If the pump fails, the engine will quickly overheat. If the pump's bearing seizes, it can snap the timing belt. This will cause the engine to shut off immediately and likely result in bent valves and damaged pistons, requiring a complete engine rebuild or replacement.
Should I get a pump with a cast iron or stamped steel impeller?
Both can work effectively. OEM pumps often use a composite or stamped steel impeller. High-quality aftermarket pumps may use cast iron, which some mechanics prefer for its durability and resistance to cavitation (the formation of damaging bubbles in the coolant). The quality of the bearing and seal is more important than the impeller material alone.
Do I need to replace the thermostat and hoses too?
It is highly recommended. While the cooling system is drained and accessible, it's smart and cost-effective to replace the thermostat and any old, soft, or bulging radiator hoses. This prevents another cooling system failure in the near future.
Helpful Videos
Technical Specifications
OEM Part Numbers: 1300A011 MD307487 MD319022
Driven by the timing belt on all 2000-2012 Mitsubishi Eclipse engines (2.4L 4G64/4G69 and 3.0L/3.8L 6G72/6G75). Replacement requires removal of timing belt, tensioners, and covers.
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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.
- Mitsubishi Eclipse:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Eclipse's Water Pump Failing?
- A Note on Leaks from Mitsubishi
- Choosing the Right Aftermarket Water Pump
- The Golden Rule: Replace with the Timing Belt
- Tier 1: OEM Quality or Better
- Tier 2: Reliable Aftermarket Options
- Tier 3: Budget-Friendly
- Cost to Replace a Mitsubishi Eclipse Water Pump
- Frequently Asked Questions
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