KOHLER Cimarron 1.28 GPF Toilet Tank K-4166 Instruction Manual

1. Product Overview

This manual provides detailed instructions for the installation, operation, and maintenance of the KOHLER Cimarron 1.28 Gallons Per Flush (GPF) Toilet Tank, model K-4166. This tank is designed for water efficiency and is part of the Cimarron collection, offering a versatile style. It is engineered to pair with specific KOHLER Cimarron toilet bowls (K-4829 or K-4347) to form a complete toilet unit.

Image 1.1: Front view of the KOHLER Cimarron 1.28 GPF Toilet Tank, model K-4166, in Biscuit color, featuring the standard left-hand trip lever.

2. Key Features

• WaterSense Certified: This tank is WaterSense-labeled, indicating it meets strict EPA flushing guidelines for water efficiency, using at least 20 percent less water than 1.6-gallon toilets.
• 1.28 GPF Flush: Delivers a powerful flush while conserving water, potentially saving up to 16,500 gallons per year compared to a 3.5-gallon toilet.
• AquaPiston Technology: Features an innovative, patented flush engine that allows water to flow into the bowl from all sides (360 degrees), enhancing flush power and effectiveness.
• Durable Canister Design: The canister design has 90% less exposed seal material than a traditional 3-inch flapper, contributing to leak-free performance and longevity.
• Standard Trip Lever: Includes a standard left-hand polished chrome trip lever for reliable flushing.
• Compatibility: Designed to combine with KOHLER K-4347 or K-4829 Cimarron toilet bowls to create a complete K-3887 or K-3851 Cimarron toilet.

3. Installation Guide

The KOHLER Cimarron K-4166 toilet tank is a component designed to be installed with a compatible Cimarron toilet bowl. Proper installation is crucial for optimal performance and water efficiency. It is recommended that installation be performed by a qualified professional.

3.1. Before You Begin

• Ensure you have the correct Cimarron toilet bowl (K-4347 or K-4829) for pairing.
• Turn off the water supply to the toilet area.
• Clear the work area and gather all necessary tools and materials.

3.2. Tank-to-Bowl Connection

1. Carefully place the tank gasket onto the flush valve tailpiece at the bottom of the tank. Ensure it is seated correctly.
2. Align the tank with the bolt holes on the back of the toilet bowl.
3. Insert the tank bolts through the tank and bowl holes. Secure with washers and nuts from underneath the bowl. Tighten nuts evenly until the tank is stable and does not rock, but avoid overtightening to prevent porcelain damage.

3.3. Water Supply Connection

1. Connect the flexible water supply line from the shut-off valve to the fill valve shank at the bottom of the tank. Hand-tighten first, then use a wrench for a final quarter-turn. Do not overtighten.
2. Slowly turn on the water supply valve and check for leaks at all connections.
3. Allow the tank to fill. Adjust the water level if necessary according to the fill valve instructions (typically a line marked inside the tank).

Image 3.1: A complete KOHLER Cimarron toilet, including the K-4166 tank, shown installed alongside a pedestal sink in a bathroom.

4. Operation

Operating the KOHLER Cimarron K-4166 toilet tank is straightforward. The tank utilizes an AquaPiston flushing mechanism for efficient waste removal.

4.1. Flushing the Toilet

To flush, simply press down on the polished chrome trip lever located on the left side of the tank. The AquaPiston canister will lift, allowing water to flow rapidly and evenly into the toilet bowl from all sides, ensuring a powerful and complete flush. Release the lever once the flush cycle begins.

4.2. Refill Cycle

After flushing, the fill valve will automatically refill the tank to the preset water level. The fill valve also directs a small amount of water to the bowl to restore the trap seal. The refill process is designed to be quiet and efficient.

5. Care and Maintenance

Regular cleaning and maintenance will ensure the longevity and optimal performance of your KOHLER Cimarron toilet tank.

5.1. Cleaning the Exterior

• Use a soft, damp cloth and mild soap or a non-abrasive bathroom cleaner.
• Avoid abrasive cleaners, scouring pads, or harsh chemicals, as these can damage the porcelain finish and the trip lever.
• Rinse thoroughly with clean water and dry with a soft cloth to prevent water spots.

5.2. Internal Components

• Periodically inspect the fill valve and AquaPiston canister for any mineral buildup or debris.
• If necessary, turn off the water supply and gently clean components with a soft brush and water. Avoid using harsh chemicals inside the tank.
• Check the tank-to-bowl bolts and water supply connection for any signs of leaks or corrosion. Tighten if necessary, but do not overtighten.

6. Troubleshooting

This section addresses common issues you might encounter with your KOHLER Cimarron K-4166 toilet tank.

6.1. Weak Flush

• Low Water Level: Ensure the water level in the tank reaches the marked waterline. Adjust the fill valve if needed.
• Obstructed Trapway: A weak flush can sometimes indicate a partial clog in the toilet bowl's trapway.
• Fill Valve Issue: Check if the fill valve is operating correctly and refilling the tank adequately.

6.2. Continuous Running Water

• AquaPiston Seal: Inspect the seal at the bottom of the AquaPiston canister for debris or wear. Clean or replace if necessary.
• Fill Valve Malfunction: The fill valve might not be shutting off completely. Check for obstructions or wear.
• Water Level Too High: If the water level is above the overflow tube, water will continuously drain. Adjust the fill valve to lower the water level.

6.3. Leaks

• Tank-to-Bowl Connection: Check the tank bolts and gasket for proper seating and tightness.
• Water Supply Line: Ensure the connection to the fill valve is tight and the supply line itself is not damaged.
• Fill Valve Shank: Inspect the nut securing the fill valve to the tank for tightness.

For persistent issues, consult a qualified plumber or contact KOHLER customer support.

7. Technical Specifications

8. Warranty and Customer Support

8.1. Warranty Information

The KOHLER Cimarron 1.28 GPF Toilet Tank, model K-4166, comes with a One Year Limited Warranty. This warranty covers manufacturing defects in materials and workmanship under normal use and service. For specific terms, conditions, and limitations of the warranty, please refer to the official KOHLER warranty documentation provided with your product or visit the KOHLER website.

8.2. Customer Support

For technical assistance, replacement parts, or warranty claims, please contact KOHLER customer service. You can find contact information, including phone numbers and online support resources, on the official KOHLER website (www.kohler.com).