Engine Machine Shop in Manitowoc, WI
At Manitowoc Motor Machining Company, our engine machine shop in Manitowoc, WI, handles everything from precision cylinder head machining and block work to crankshaft repair, balancing, dyno testing, and heavy-duty diesel machining. And for more than 40 years, our local team has served customers from our fully equipped facility along the Lake Michigan corridor between Green Bay and Milwaukee. From a small Honda generator to a Caterpillar V-16 diesel, we approach every job with the same focus on accurate measurements, OEM-guided procedures, skilled workmanship, and a finished product that reflects pride in the work.
Precision Engine Machining for Nearly Any Application
Engine machining is not one-size-fits-all. A racing engine, agricultural diesel, marine motor, vintage V-12, and industrial power unit all have different tolerances, materials, operating demands, and surface-finish requirements.
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Our ASE-certified master engine machinists use advanced general and specialty equipment to inspect, measure, machine, repair, and verify critical components. We support light-duty, heavy-duty, high-performance, agricultural, industrial, marine, motorcycle, ATV, snowmobile, and small-engine applications.
Complete Engine Block Machining
Accurate block preparation creates the foundation for a dependable rebuild. With this in mind, our engine block machining in Manitowoc can address cylinder condition, deck geometry, main alignment, bearing fit, damaged castings, and the dimensional relationships that affect compression, oil control, and component life.
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Our block services may include:
- Engine block blueprinting
- High-performance engine decking
- Heavy-duty diesel block repair
- Roller-cam bearing machining
- Cylinder boring and honing support
- Main-bore and alignment evaluation
- Casting and crack repair
- Metal stitching
- Surface-finish verification
- CNC machining for specialty requirements
We also follow applicable OEM standards and guidelines while adapting the process to the engine’s intended use. That may mean restoring factory dimensions, preparing a competition engine, or saving an uncommon block that cannot be replaced easily.
Cylinder Head Machining and Repair
Cylinder heads face intense heat, pressure, and repeated valve movement. Warped surfaces, worn guides, damaged seats, cracks, and incorrect finishes can lead to compression loss, coolant leaks, oil consumption, poor combustion, and premature gasket failure.
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Our cylinder head machining capabilities include resurfacing, custom valve seats, seat and guide installation, crack repair, dimensional inspection, and specialty machining. Our Rottler SF7M Resurfacer can produce required surface finishes, and we can verify those results using a profilometer reading.
Diesel Engine Machining From Light to Heavy Duty
Diesel engines depend on precise clearances and durable component preparation because they operate under high compression and demanding loads. Our heavy-duty diesel engine machining supports pickups, agricultural equipment, industrial machinery, marine applications, and heavy-duty power systems.
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We work on engines ranging from smaller diesel units to large commercial and industrial platforms. Our equipment includes a Rottler F67A three-axis CNC machining center and a computerized engine balancing center suited to both performance and diesel applications.
Racing and High-Performance Engine Work
High-performance engines require more than standard replacement tolerances. Deck height, rotating assembly balance, surface finish, bearing alignment, valvetrain geometry, and crankshaft condition all influence how reliably an engine performs at elevated speed and load.
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Our racing and performance services include engine balancing, block blueprinting, decking, roller-cam bearing machining, custom valve seats, crankshaft straightening, and 1,600-horsepower engine dyno testing. We help builders verify the results instead of relying only on assumptions.
Vintage, Exotic, and Difficult Engine Projects
Manitowoc Motor Machining specializes in doing the undoable. That philosophy has led us to challenging vintage and exotic work, including machining V-12 Ferrari engines and producing Duesenberg cylinder heads from raw castings.
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Older and uncommon engines often require creative problem-solving because replacement parts, original specifications, and usable castings may be limited. Our combination of CNC capability, welding, crack repair, metal stitching, machining, and rebuilding experience gives us more options for preserving rare components.
Engine Balancing and Dyno Testing
A properly balanced rotating assembly can reduce vibration, improve bearing life, and support smoother operation across the engine’s intended RPM range. Our computerized balancing center handles automotive, racing, diesel, industrial, and specialty engine applications.
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We also provide snowmobile clutch and secondary balancing, along with sub-harmonic vibratory stress relief for appropriate components. When performance verification is required, our 1,600-horsepower engine dyno allows us to evaluate engine behavior under controlled operating conditions.
More Than Engine Machining
Our shop is also a full resource for related mechanical, electrical, hydraulic, welding, and fabrication needs. Keeping these capabilities in-house can simplify complex repairs that would otherwise require coordinating several separate vendors.
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Additional services include:
- Alternator and starter repair
- Combination motor-generator repair
- Custom battery cable fabrication
- Hydraulic hose fabrication
- Hydraulic tube bending, cutting, and fabrication
- Custom welding
- Shaft buildup and repair
- Complete hydraulic lifting equipment service units
- Casting and crack repair
- Specialty component manufacturing
An ERA-certified electrical specialist is available for starter, alternator, and combination motor-generator work. Our Tubes ’n Hoses Center can also fabricate a wide range of hydraulic tubes and hoses for industrial, agricultural, mobile, and specialty equipment.
A Team Approach Built on Accuracy
Our technicians work together as a core team of engine professionals rather than treating each machining step as an isolated task. Measurements, machining operations, inspection findings, and intended engine use are considered together throughout the project.
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Owner Lyn Nudd and our crew use an extensive collection of modern and specialized machine tools to deliver consistent results. We strive to complete every job correctly, communicate findings clearly, and return components prepared for dependable assembly and operation.
On-Site Service at Our Manitowoc Facility
Customers are welcome to bring engines, components, hydraulic assemblies, starters, alternators, and specialty projects directly to our shop. We serve local vehicle owners, repair facilities, engine builders, racers, farms, marine operators, industrial customers, and collectors. Our location on Wisconsin’s Lake Michigan shoreline also makes us accessible to customers throughout the region, including those traveling between Green Bay and Milwaukee for specialized machine work that may not be available closer to home.
Manitowoc Motor Machining Company
2308 Franklin St
Manitowoc, WI 54220
920.684.8577
Frequently Asked Questions
A specialty shop can inspect, measure, resurface, bore, hone, balance, straighten, weld, repair, and machine engine components. Services may also include cylinder head work, block blueprinting, crankshaft repair, CNC machining, dyno testing, and restoration of rare or damaged parts.
Low compression, overheating, oil consumption, bearing damage, cracked castings, warped surfaces, vibration, or failed internal components may indicate machining is needed. Accurate disassembly, cleaning, and measurement are usually required before the full condition can be determined.
Yes. We work on racing, high-performance, vintage, exotic, marine, diesel, agricultural, industrial, motorcycle, snowmobile, ATV, and small-engine projects. Each job is evaluated according to the engine design, component condition, intended use, and available specifications.
Machining may preserve valuable original components, restore correct tolerances, support a custom build, or save an engine that is rare or difficult to replace. A professional evaluation can clarify whether rebuilding, repairing, or replacing offers the strongest value.
Bring Us the Engine Work Others Turn Away
When an engine, cylinder head, block, crankshaft, or specialty component requires more than routine repair, Manitowoc Motor Machining Company has the equipment and experience to take on the challenge. Our 40-year local history, ASE-certified machinists, CNC capability, dyno testing, balancing equipment, and broad rebuilding knowledge allow us to support projects ranging from everyday engines to rare classics.
So don’t wait: call (920)-684-8577 or visit us at 2308 Franklin St to discuss your project. We’ll evaluate the work, explain the available options, and apply the same careful standards whether the job is small, massive, common, or nearly impossible.