NK120: TANK, Ford Lehman | $99.95

NK120 Comparison

NK120 in New other (see details) Condition
photo	price	summary	rating
Details	$99.95	Condition is New other (see details), Ford Lehman NK120 Expansion Tank Neck Kit Marine Diesel 120, shipping cost = $15.96	100.0%

NK120 in Nuovo Condition
photo	price	summary	rating
Details	$141.44	Condition is Nuovo, COMPLETE ROOF RACK BAR KIT - 120 - QUADRA L NORDRIVE FORD C-MAX (11/10 ), shipping cost = $73.40	95.8%
Details	$149.72	Top Pick! Condition is Nuovo, COMPLETE ROOF RACK BAR KIT - 120 - HELIO L NORDRIVE FORD C-MAX (11/10 ), shipping cost = $73.40	95.8%
Details	$171.27	Condition is Nuovo, COMPLETE ROOF RACK BAR KIT - 120 - ALUMIA L NORDRIVE FORD C-MAX (11/10 ), shipping cost = $73.40	95.8%

NK120 FORD LEHMAN Expansion Tank Neck Diesel Kit Marine

Introducing the Ford Lehman NK120 Expansion Tank Neck Kit, specifically designed for marine diesel engines. This essential component is an upgrade from the standard OEM expansion tank neck, offering enhanced durability and improved performance for your marine diesel engine.

The Ford Lehman NK120 Expansion Tank Neck Kit is precisely engineered to fit Ford Lehman marine diesel engines with a coolant capacity of 120 quarts. Crafted from high-quality materials, this neck kit is built to withstand the rigors of marine environments, ensuring reliable operation even in the harshest conditions.

This kit comes with a replacement expansion tank neck, a new O-ring, and a gasket to ensure a secure and leak-free installation. The O-ring is made from a premium, resilient material that provides an excellent seal, preventing coolant loss and potential damage to your engine. The gasket is designed to provide a perfect seal between the expansion tank and the engine, ensuring proper coolant flow and maintaining optimal engine temperature.

The Ford Lehman NK120 Expansion Tank Neck Kit is easy to install, making it a popular choice among marine diesel engine owners. Simply remove the old expansion tank neck, install the new one along with the provided O-ring and gasket, and securely fasten the components in place. No need for any complex modifications or special tools this kit is designed for a straightforward installation process.

Investing in the Ford Lehman NK120 Expansion Tank Neck Kit is an excellent decision for marine diesel engine owners seeking to enhance their engine's performance and durability. With its robust design, secure fit, and simple installation process, this expansion tank neck kit is an essential upgrade for any marine diesel engine. Upgrade your engine today with the Ford Lehman NK120 Expansion Tank Neck Kit.

The Ford Lehman NK120 expansion tank neck kit is designed for marine diesel engines, specifically those using the Ford 6.4L or 6.8L Power Stroke engines. This kit is intended to replace the original expansion tank neck, which may wear out or get damaged over time. Here are some pros and cons to consider before making a purchase:

Pros:

1. Improved Durability: The Ford Lehman NK120 kit is made of high-quality materials, which can withstand the harsh marine environment better than the original OEM part.

2. Easy Installation: The kit comes with all necessary hardware and instructions, making the installation process relatively straightforward for DIYers.

3. Enhanced Cooling System: This kit can help improve the overall cooling system's performance, as it allows for better air flow and cooling capacity.

4. Prevents Overheating: By upgrading the expansion tank neck, you can help prevent overheating issues, which can save you from costly engine repairs.

Cons:

1. Cost: Compared to the OEM part, the Ford Lehman NK120 kit can be more expensive. However, the long-term benefits and improved durability may outweigh the initial investment.

2. Availability: Depending on your location and supplier, you may have a harder time finding this specific kit compared to the OEM part.

3. Compatibility: Ensure that this kit is compatible with your marine diesel engine before making a purchase.

Conclusion:

If you own a marine diesel engine and have experienced issues with the original expansion tank neck, investing in the Ford Lehman NK120 kit can be a wise decision. The improved durability, easy installation, enhanced cooling system, and prevention of overheating issues make it a valuable investment for boat owners. However, consider the cost and availability before making a purchase, and always double-check compatibility with your specific engine.

Recommendation:

If you're in the market for an expansion tank neck kit for your marine diesel engine, the Ford Lehman NK120 kit is a solid choice. Its durability, ease of installation, and potential performance enhancements make it a worthwhile investment for boat owners looking to prolong the life of their engines. Just be sure to confirm compatibility and availability before purchasing.

Details:

Kit includes: new filler neck automotive standard size. Reliability: eliminates leaks common with the old, worn-out wide-style caps and necks. Installation typically involves removing the old neck and epoxy-sealing, braising or welding new into place. Overflow nipple/fitting.

This enables the use of a modern recovery-style radiator cap and addition coolant overflow bottle, keeping your engine room cleaner cooling system more efficient. Ford Lehman NK120 neck kit. By installing this kit, you move away from the obsolete wide-neck cap to a standard automotive-size neck. Key benefits: pressure testing: allows you to use standard automotive cooling system pressure testers find leaks easily.

Coolant recovery: supports the installation of a recovery tank so excess coolant is pulled back into engine rather than venting bilge. This kit is a direct fit for the steel expansion tanks found on Ford Lehman 80, 120, and 135 hp series.

specifications inboardfuel:

for models: Marine
brand: Ford Lehman
mpn: Nk120
part type: Tank
country of origin: United States
california prop 65 warning: Yes

seller inboardfuel:

city: seattle, washington
# reviews: 341
rating: 100.0%

offer inboardfuel:

availability: in stock
prices: $99.95–$171.27
item condition:
- New other (see details)
- Nuovo
sold #: 6
in stock #: 4
options: ship-to-home
started: march 30, 2026

payments inboardfuel:

credit card: discover
wallet: paypal
other

returns inboardfuel:

policy: returns accepted
time: 30 days
paid by: seller

general inboardfuel:

category: Boat Parts > Inboard Engines Components > Intake Fuel Systems

shipping inboardfuel:

carrier: usps, ups, fedex
transit: 3-7 days
service: usps ground advantage, ups next day air, ups ground, fedex 2day one rate extra large box
class: standard, one-day, expedited
type: calculated

rating: 100.0% out of 100 based on 341 user ratings.