Manitowoc Motor Machining Company
Precision Engine Machining and Heavy-Duty Diesel Expertise Since 1985
When you need an experienced engine machine shop in Wisconsin, our team at Manitowoc Motor Machining Company is ready to tackle the work others may turn away. Since 1985, we have provided heavy-duty diesel machining, cylinder head machining in Wisconsin, engine block machining, diesel engine rebuilding, electrical rebuilding, welding, and hydraulic fabrication. Our ASE-certified master engine machinists combine advanced equipment with hands-on problem-solving, whether we are working on a compact generator, a fleet diesel engine, a marine powerplant, or a Caterpillar V-16.
Our core machining capabilities include cylinder head machining, precision engine block machining, and heavy-duty diesel engine machining for commercial, industrial, agricultural, marine, fleet, performance, and specialty applications.
More Than 40 Years of Engine Machining Experience
We have spent more than four decades building a reputation for detailed workmanship, technical knowledge, and the willingness to solve unusual engine problems. Our team follows original equipment manufacturer standards and proven machining practices while using modern equipment to verify measurements, finishes, tolerances, balance, and performance.
That experience matters when an engine failure affects a truck, boat, farm machine, industrial unit, or specialty vehicle. Our machinists understand that downtime costs money, disrupts schedules, and creates pressure for owners and operators. We focus on identifying the real problem and completing the work carefully the first time.
See What Clients Are Saying
A Fully Equipped Engine Machine Shop
Our facility is designed to handle light-duty, heavy-duty, industrial, agricultural, marine, racing, vintage, and specialty engine components. We combine conventional machining knowledge with CNC capabilities, computerized balancing, precision resurfacing, crack repair, welding, and testing to provide a broad range of services in one location.
Our equipment includes a Rottler F67A three-axis CNC machining center, a Rottler SF7M resurfacer, a computerized engine balancing center, and a 1,600-horsepower engine dynamometer. These tools help our machinists complete accurate work and verify the results rather than relying only on visual inspection or rough estimates.
Diesel Engine Rebuilding
Engine Block Machining
Cylinder Head Repair
Fleet Engine Machining
Marine Engine Machining
Agricultural Engine Machining
Racing & Performance
1,600-HP Engine Dyno
Crankshaft Repair
CNC & Specialty Machining
Casting & Crack Repair
Electrical Rebuilding
Hydraulic Hose & Tube Fabrication
Custom Welding
Small Engines & Power Sports
Heavy Duty Diesel Machining for Demanding Applications
Heavy-duty diesel engines operate under substantial heat, pressure, vibration, and load. Over time, worn cylinders, damaged decks, cracked castings, distorted heads, crankshaft problems, and bearing issues can reduce power or lead to complete engine failure. Our heavy-duty diesel machining services address those conditions with careful inspection and precision work.
We machine and repair diesel components for commercial trucks, equipment, industrial applications, fleets, agricultural machinery, and marine engines. From individual cylinder head repair to complete diesel engine rebuilding, our team coordinates each stage to help restore proper clearances, sealing, balance, compression, and dependable performance.
Diesel Engine Rebuilding From Inspection to Testing
A successful diesel engine rebuild begins with more than replacing worn parts. We inspect components, measure critical surfaces, evaluate damage, clean reusable parts, machine them as needed, and assemble the engine according to the correct specifications. Each decision is based on condition, application, and the expected workload.
Our rebuilding capabilities can include cylinder boring, honing, decking, crankshaft work, rod reconditioning, balancing, head machining, valve work, and final testing. When dyno testing is appropriate, we can evaluate output and operation under controlled conditions before the rebuilt engine returns to service.
Engine Block Machining and Boring
The engine block supports the rotating assembly, cylinders, bearings, oil passages, and many of the engine’s most important clearances. Wear, overheating, corrosion, cracks, or previous repairs can affect alignment and sealing. Our engine block machining process begins with inspection and measurement before any material is removed.
Our capabilities include engine block boring, honing, decking, blueprinting, heavy-duty diesel block repair, roller-cam bearing machining, and related specialty work. We use accurate machining methods to restore geometry and prepare the block for the correct pistons, bearings, gaskets, and internal components.
Cylinder Head Repair and Precision Machining
Cylinder heads face extreme heat and pressure, making them vulnerable to warping, cracks, worn guides, damaged seats, and sealing problems. Poor head condition can cause low compression, coolant loss, oil consumption, misfires, overheating, or reduced performance. Our team evaluates each head before recommending repair or replacement.
Our cylinder head services include resurfacing, crack inspection, casting repair, seat and guide installation, custom valve seats, and machining for specialty applications. Our Rottler resurfacing equipment can produce the required surface finish, and we can verify that finish with a profilometer reading when the application requires documented accuracy.
Fleet Engine Machining That Helps Control Downtime
Fleet vehicles need reliable engines because one disabled unit can affect deliveries, staffing, scheduling, and customer commitments. Our fleet engine machining services support operators who need consistent repair quality across multiple vehicles or engine platforms. We work with fleet managers, repair facilities, and equipment owners to coordinate component work efficiently.
We can machine blocks, heads, crankshafts, rods, and other engine components while also assisting with electrical, hydraulic, and welding needs. Keeping these capabilities under one roof helps reduce unnecessary hand-offs and gives fleet customers one knowledgeable team for a wider range of repair requirements.
Marine Engine Machining Near Lake Michigan
Marine engines operate in demanding conditions that combine sustained loads, moisture, corrosion, temperature changes, and limited tolerance for failure. When a marine engine develops internal damage, accurate machining is essential because improper clearances or sealing can quickly lead to another breakdown.
Our marine engine machining services support recreational, commercial, industrial, and specialty marine applications. We repair and machine cylinder heads, blocks, crankshafts, rotating assemblies, and related components while considering the engine’s operating environment. Our location near Lake Michigan gives us practical familiarity with the needs of marine customers.
Agricultural Engine Machining for Working Equipment
Farm and agricultural equipment often runs for long hours under heavy loads, especially during planting, harvesting, and other time-sensitive periods. Engine problems during those seasons can quickly become expensive. Our agricultural engine machining services are designed to help restore tractors, generators, pumps, loaders, and other essential equipment.
We work on gasoline and diesel engines used in agricultural and industrial applications, from smaller units to large displacement systems. Our team understands that these engines must deliver torque, durability, and dependable operation, so we approach each machining and rebuilding project with those working conditions in mind.
Racing, High-Performance, and Engine Balancing Services
Performance engines require precise measurements because small inconsistencies can affect power, durability, vibration, and component life. Our racing and high-performance services include engine balancing, block blueprinting, high-performance decking, custom machining, and dyno testing for qualifying engine builds.
Our computerized balancing center allows us to evaluate rotating assemblies for diesel, performance, and industrial applications. We also balance snowmobile clutches and secondary assemblies. Whether the goal is smoother operation, increased reliability, or improved output, we match the machining process to the engine’s intended use.
A 1,600-Horsepower Engine Dyno
Dyno testing allows us to evaluate an engine under controlled load rather than waiting until it is installed in a vehicle or piece of equipment. Our 1,600-horsepower engine dyno helps us assess power, operating behavior, and performance after rebuilding or modification when the engine and project are suitable for testing.
This capability can be especially valuable for diesel, performance, racing, marine, and specialty engines. Dyno data gives customers and machinists useful information about how the engine performs before it returns to real-world service, helping confirm the results of careful machining and assembly.
Crankshaft Straightening, Balancing, and Repair
A damaged or distorted crankshaft can create vibration, bearing wear, oil pressure problems, and serious internal damage. Our crankshaft services may include inspection, straightening, polishing, repair, and coordination with the rest of the rotating assembly, depending on the component’s condition and application.
We also perform shaft buildup and repair for qualifying components. Accurate crankshaft work requires experienced judgment because not every damaged part can or should be reused. Our team explains the condition, available repair path, and practical limitations before completing extensive work.
CNC Machining and Specialty Engine Work
Some engine projects cannot be completed with standard catalog parts or routine machining procedures. Our CNC machining capabilities allow us to produce accurate modifications, repair unique components, and work with unusual castings or engine designs that require a custom approach.
We have machined components for exotic and vintage engines, including V-12 Ferrari engines and Duesenberg heads created from raw castings. These projects reflect our willingness to solve difficult problems. When replacement parts are unavailable, custom machining, welding, or manufacturing may provide a workable path forward.
Casting, Crack Repair, and Metal Stitching
Cracked castings do not always mean a valuable component must be discarded. Depending on the material, location, extent of damage, and operating demands, repair may be possible. Our team evaluates the component before recommending welding, metal stitching, machining, or another repair method.
Metal stitching can be useful for certain cast iron repairs where heat-related distortion must be minimized. We also provide casting and crack repair for qualifying blocks, heads, housings, and specialty components. Every repair is considered individually because safe, dependable results depend on the specific damage.
Electrical Rebuilding by an ERA-Certified Specialist
Our services extend beyond engine machining. An ERA-certified electrical specialist is available for starter, alternator, and combination motor-generator repair. This in-house capability helps customers address starting, charging, and electrical component problems without sending the unit through another unrelated provider.
We also build custom battery cables for specialized applications. Electrical rebuilding can be a practical solution when a replacement is difficult to locate, unusually expensive, or not available for an older machine. Our specialist inspects the unit and explains the available repair options.
Hydraulic Hose & Tube Fabrication
Hydraulic Hose and Tube Fabrication
Hydraulic failures can stop construction equipment, agricultural machinery, industrial systems, and lifting equipment without warning. At our Tubes ’n Hoses Center, we fabricate many types of hydraulic hoses and tubes in-house. This service helps customers replace damaged lines and restore equipment operation without unnecessary delays.
Our capabilities include hydraulic hose fabrication, tube bending, cutting, and custom tube manufacturing. We also provide complete service units for hydraulic lifting equipment. By combining hydraulic work with machining, welding, and electrical rebuilding, we offer a convenient resource for equipment owners and repair professionals.
Custom Welding and Component Repair
Welding often plays an important role in repairing engine parts, equipment components, brackets, housings, and specialty assemblies. Our custom welding services support both routine repairs and unusual projects where an original component may no longer be available.
We evaluate the material, damage, stress, and expected use before recommending a welding solution. In some cases, welding is combined with machining so the repaired surface can be restored to the required dimensions. This coordinated approach helps produce a cleaner and more functional finished component.
Small Engines, Power Sports, and Specialty Applications
Our shop is equipped to work on more than large diesel engines. We also provide machining and rebuilding support for ATV, motorcycle, snowmobile, generator, and other small-engine applications. A compact engine still requires accurate machining, especially when parts are worn, damaged, or difficult to replace.
From a small Honda generator to a Caterpillar V-16 diesel, we do not judge a project by engine size alone. We look at the technical challenge, component condition, repair options, and customer needs. That flexible approach has helped us become a resource for many different engine owners and repair shops.
Professional Machinists Who Take Pride in the Work
Our knowledgeable technicians work together as a core team of engine professionals. Each machinist brings experience, technical training, and attention to detail, while our parts department stays current on specifications, repair information, and component availability for a broad range of engines.
We believe the finished product should reflect a job well done. That means clean components, accurate measurements, proper machining, clear communication, and honest expectations. Our ASE-certified master engine machinists use their equipment and experience to produce work they are comfortable standing behind.
Why Customers Choose Manitowoc Motor Machining Company
Engine machining is specialized work, and customers need confidence that their components are being handled by people who understand the consequences of every cut, measurement, and repair. Our team combines decades of experience with modern equipment and a willingness to take on challenging projects.
Customers rely on our shop for several important reasons:
- ASE-certified master engine machinists
- Heavy-duty diesel and industrial expertise
- Cylinder head machining
- Engine block machining
- Diesel engine rebuilding and dyno testing
- Marine, fleet, and agricultural engine machining
- CNC machining and computerized balancing
- Exotic, vintage, and custom engine experience
- ERA-certified electrical rebuilding
- Hydraulic hose and tube fabrication
- Custom welding and casting repair
- Service for engines of nearly every size
Serving Customers Across Wisconsin and Beyond
Our shop is located along the Lake Michigan shoreline between Green Bay and Milwaukee, making us accessible to customers throughout the surrounding region. We serve engine builders, repair facilities, fleets, farms, marine operators, equipment owners, performance enthusiasts, and individuals with difficult or unusual machining needs.
Visit our shop at 2308 Franklin St, Manitowoc, WI 54220. From our Manitowoc location, we provide precision engine machining services for customers throughout Wisconsin and beyond.
Wisconsin equipment must also perform through cold starts, seasonal temperature changes, heavy workloads, road salt, moisture, and demanding industrial conditions. Our local experience helps us understand how those factors affect diesel engines, marine systems, agricultural machinery, and working equipment over time.
Frequently Asked Questions
We work on light-duty, heavy-duty, industrial, marine, agricultural, racing, high-performance, power sports, vintage, and exotic engines. Projects range from small generators and motorcycle engines to large diesel, fleet, and Caterpillar V-16 applications.
Yes. Our diesel engine rebuilding services may include inspection, cleaning, block machining, cylinder head repair, crankshaft work, balancing, component replacement, assembly, and dyno testing. The exact process depends on the engine’s condition and intended application.
In many cases, yes. We offer casting repair, crack repair, welding, and metal stitching for qualifying components. We inspect the damage first because repair feasibility depends on the material, crack location, severity, previous repairs, and operating demands.
Yes. We provide cylinder head resurfacing, valve seat and guide work, custom valve seats, crack inspection, and related repairs. Our resurfacing equipment can produce application-specific finishes, and we can verify the surface with a profilometer reading when needed.
Yes. Our engine block machining services include boring, honing, decking, blueprinting, diesel block repair, and machining for roller-cam bearings. We measure the block carefully and machine it according to the correct component specifications and clearances.
Yes. We provide fleet engine machining and work with commercial repair facilities, equipment operators, farms, marine businesses, and industrial customers. We can coordinate recurring or multi-component work while helping customers manage equipment downtime.
Yes. Our ERA-certified electrical specialist repairs starters, alternators, and combination motor-generators. We also fabricate custom battery cables for specialty, industrial, agricultural, marine, vintage, and equipment applications.
Yes. Our Tubes ’n Hoses Center fabricates hydraulic hoses and provides tube bending, cutting, and custom tube fabrication. We also service hydraulic lifting equipment and support many agricultural, industrial, construction, and mobile equipment applications.
Yes. We have extensive experience with vintage, exotic, and difficult-to-source components. Our past work includes V-12 Ferrari engines and Duesenberg cylinder heads machined from raw castings, along with many other specialty projects.
Bring Us the Engine Work Others Call Impossible
When an engine, cylinder head, block, crankshaft, starter, hydraulic line, or specialty component needs expert attention, our team is ready to take a closer look. Manitowoc Motor Machining Company combines more than 40 years of experience, ASE-certified machinists, advanced equipment, and practical problem-solving under one roof. From diesel engine rebuilding and fleet machining to marine, agricultural, racing, vintage, and industrial projects, we approach every job with precision and pride. Contact our shop today to discuss your engine, component, or equipment repair needs.
Proudly providing motor machining services to the following areas: Manitowoc, WI | Sheboygan, WI | Milwaukee, WI | Butler, WI | Waukesha, WI | Cedarburg, WI | Francis Creek, WI