Removing the Engine from a 1985 Case 1155D Dozer

[MikePhua]

The History Behind the 1155D Series
The Case 1155D crawler loader was part of Case Corporation’s push in the 1980s to modernize mid-size tracked equipment for construction and land clearing. Case, founded in 1842 and later merged into CNH Industrial, had already built a reputation for durable agricultural and construction machinery. The 1155D was introduced as a successor to the earlier 1155B, featuring improved hydraulics, a more powerful engine, and better operator ergonomics. Powered by a Case 6-590 diesel engine rated at approximately 110 horsepower, the 1155D was widely used in grading, demolition, and forestry applications. Thousands of units were sold across North America and Europe, and many remain in service today due to their mechanical simplicity and rebuildable components.
Preparing for Engine Removal
Removing the engine from a 1155D is a significant task that requires planning, proper tools, and safety precautions. The engine is mounted within a steel frame under the operator’s cab, connected to the transmission via a torque converter. Before removal, technicians should:

• Disconnect the battery and secure all electrical leads
  
• Drain coolant and engine oil completely
  
• Remove the hood, side panels, and radiator assembly
  
• Label and disconnect fuel lines, throttle linkages, and hydraulic hoses
  
• Unbolt the exhaust manifold and remove the muffler stack
  

It’s recommended to use a gantry crane or heavy-duty engine hoist rated for at least 1,000 kg, as the engine block is cast iron and includes the flywheel housing and accessory mounts.
Challenges in Accessing the Engine
One of the main difficulties in removing the engine is the limited clearance between the engine and the frame rails. The loader arms and hydraulic cylinders can obstruct access, especially if the bucket is not fully lowered and secured. In some cases, operators have removed the loader arms entirely to gain better access. This involves:

• Supporting the arms with cribbing or stands
  
• Disconnecting hydraulic lines and pins at the pivot points
  
• Removing the crossbar and tilt cylinders
  

While this adds time, it can significantly reduce the risk of injury and damage during engine extraction.
Torque Converter and Bellhousing Separation
The Case 1155D uses a torque converter mounted directly to the engine flywheel. To separate the engine from the transmission:

• Remove the inspection cover on the bellhousing
  
• Rotate the engine to access and unbolt the torque converter bolts
  
• Support the transmission with a jack or stand to prevent sagging
  
• Carefully slide the engine forward to disengage the input shaft
  

Some technicians prefer to remove the engine and torque converter as a unit, especially if the converter needs inspection or replacement. However, this requires additional lifting capacity and careful alignment during reinstallation.
Field Story and Practical Insight
In rural Kentucky, a land-clearing contractor faced a seized engine on his 1985 1155D after a coolant leak went unnoticed during summer operations. With limited shop access, he built a timber A-frame hoist using 6x6 posts and a chain fall. After removing the loader arms and radiator, he extracted the engine over two days, working with a retired mechanic who had serviced similar machines in the 1990s. They discovered a cracked head and scored cylinders, ultimately opting for a remanufactured long block. The machine returned to service within a week, clearing brush for a new pasture.
Engine Reinstallation Tips
When reinstalling the engine:

• Replace all gaskets and seals, especially at the rear main and oil pan
  
• Inspect and clean the mating surfaces of the bellhousing
  
• Use alignment studs to guide the engine into position
  
• Torque all bolts to factory specifications using a calibrated wrench
  
• Prime the fuel system and check for leaks before startup
  

It’s also wise to flush the cooling system and replace the thermostat to prevent future overheating.
Recommended Upgrades During Removal
While the engine is out, consider:

• Replacing motor mounts and isolators
  
• Installing a new water pump and belts
  
• Upgrading to a spin-on oil filter adapter
  
• Inspecting the starter and alternator for wear
  
• Replacing worn hydraulic hoses near the firewall
  

These upgrades can extend the machine’s service life and reduce future downtime.
Conclusion
Removing the engine from a Case 1155D is a labor-intensive but manageable task with the right preparation and tools. Whether addressing a catastrophic failure or performing a rebuild, understanding the layout and challenges of this classic crawler loader is key to a successful repair. With careful planning and attention to detail, operators can restore these machines to full working order—preserving a piece of construction history that still earns its keep in the field.