Yanmar L90AE User Manual

General engine model specifications, performance, and dimensions.

Illustrative diagrams showing engine internal components and layout.

Detailed specs for valves, guides, springs, rocker arms, and clearance.

Critical dimensions and clearances for pistons and piston pins.

Measurement standards for piston ring width, clearance, and dimensions.

Specifications for connecting rod, crank pin, crankshaft, and bearings.

Specifications for crankcase, cylinder block, and their bearing parts.

Oil pump dimensions and cylinder compression pressure standards.

List of essential tools, jigs, and meters for engine servicing.

Required measuring instruments and service accessories for shops.

Standard bolt and nut tightening torques for various engine parts.

Periodic maintenance schedule based on operating hours.

Step-by-step instructions for disassembling engine components.

Step-by-step instructions for reassembling engine components.

Procedures for checking the cylinder head and its components.

Inspection of pistons, piston pins, and their clearances.

Inspection procedures for crankshaft, main bearing, and flywheel.

Procedures for checking camshaft and tappets.

Checking and reassembling timing gears.

Inspection and tightening of the crankcase cover.

Checking cylinder sleeve and block dimensions.

Inspection and maintenance of the lubrication system.

Procedures for checking and servicing the fuel system components.

Information on the governor and speed control device.

Wiring diagrams for charging generators.

Performance data and specifications for starter motors.

Overview of starter motor construction and types.

Step-by-step guide for disassembling starter motors.

Methods for inspecting starter motor components.

Adjusting starter motor components and performance testing.

Important points to consider during starter motor reassembly.

Specifications and checks for generator, regulator, and rectifier.

Guidelines for battery capacity and cable selection.

Procedures for inspecting battery electrolyte level and condition.

Instructions and precautions for charging the battery.

Diagnosing and resolving issues related to no fuel injection sound.

Troubleshooting low compression pressure in the engine.

Causes and remedies for a heavy recoil starter.

Diagnosing and fixing starter motor failures.

Troubleshooting issues with insufficient battery charging.

Addressing hard starting and low compression issues.

Causes and remedies for unexpected reverse rotation at startup.

Diagnosing and fixing engine racing issues.

Troubleshooting uneven engine rotation.

Identifying causes for engine output drops.

Troubleshooting sudden engine stops during operation.

Interpreting and resolving abnormal exhaust colors.

Pre-start checks and preparations for the test run.

Step-by-step guide for starting the engine.

Procedures for operating the engine during the test run.

Procedures for safely stopping the engine.

Explanation of the helical inserting part and its use.

Dimensions and specifications for helical inserting parts.

Steps for drilling, tapping, and inserting helical parts.

Differences in crankcase cover and camshaft assembly between S and D specs.

Differences in flywheel and piston between S and D specifications.

Differences in cooling fan case and starter motor between S and D specs.

Dimensions and part codes for oil seal fitting tools.

Dimensions and part codes for valve stem seal fitting tools.

Specifications and dimensions for the flywheel tightening handle.

Specifications and dimensions for the flywheel extractor.