This comprehensive workshop manual is specifically designed for the Porsche 944 engine, covering models from 1987 to 1991. It delves into the intricacies of the 16-valve engine, providing detailed information and instructions for a wide range of repair and maintenance procedures. The manual begins with general technical data, including maintenance schedules, self-diagnosis guides, and fault diagnosis techniques for the DEE control unit. It then dives into the specifics of connecting to the 944S model, troubleshooting starting issues, and conducting functional tests for actuators and input signals. The manual includes a comprehensive list of test codes, system adaptation instructions, and in-depth explanations of knock detection and troubleshooting. Additionally, it offers instructions for clearing fault memories and utilizing the System Tester 9288.

Moving on to the engine itself, the manual covers the intricacies of the crankcase, providing tightening torques for the 16-valve engine, along with tolerances and wear limits. It guides you through the process of removing and installing the engine, focusing on the crankshaft drive and pistons. Specific instructions are provided for piston assembly for models manufactured from 1987 onward, including checking pistons and cylinder bores, as well as detailed information regarding pistons for models manufactured from 1989 onward. The manual also includes instructions for installing the cover for the oil-centrifuge partition.

The manual extensively details the cylinder head and valve drive systems, covering procedures for checking and adjusting camshaft timing for both pre-1989 and post-1989 models. You'll find instructions on applying the TOC mark to the camshaft sprocket and detailed guidance for removing and installing the cylinder head and camshafts. It includes comprehensive information on camshaft specifications, the installation of camshaft seals, and procedures for removing and installing the chain tensioner. Further instructions cover disassembling and assembling the cylinder head, removing and installing valve springs, and machining the mating face of the cylinder head. Instructions are provided for removing and installing valve stem seals, checking valve guides, replacing them if necessary, and inspecting for valve seat wear. The manual also guides you on checking and machining valve seats, as well as checking and adjusting the installation length of valve springs.

The manual delves into the engine's lubrication system, explaining how to replace engine oil and oil filters, and detailing the removal and installation of the pressure-reducing valve. It also provides information on inspecting the cooling and heating system for leaks. The fuel supply system is covered in detail, including instructions for replacing the fuel filter, checking injection lines for leaks and tightness, and testing the delivery rate of the fuel pump. The manual provides a detailed diagram for fuel system line routing for the M44.40 model.

Focusing on fuel preparation with the L-Jetronic/regulation system, the manual instructs on replacing the air filter cartridge, checking intake-air guide hoses, and testing and adjusting a wide range of specifications. This includes checking fuel pressure, idle speed, and CO levels for both models with and without catalytic converters. The manual separately covers the replacement of the air filter cartridge for models manufactured from 1989 onward. The exhaust system is addressed, outlining instructions for checking the tightness of flanges.

The ignition system is covered comprehensively, with a dedicated equipment table and instructions for coding the DEE control unit for the 944S model from 1987 onwards. You'll find guidance on replacing spark plugs and a separate equipment table specifically for models manufactured from 1989 onward. This section also includes instructions for coding the DEE control unit for the 944S 2 model from 1989 onwards. The manual concludes with an extensive section on DME-Diagnosing and Troubleshooting, providing valuable insights for resolving various engine-related issues.

The Porsche 944, launched in 1982, was a significant departure from the iconic 911, offering a more affordable and accessible sports car experience. While sharing some of its heritage with the 911, boasting a rear-mounted engine, the 944 embraced a more practical and efficient design. The 944's heart was a 2.5-liter, four-cylinder engine, a departure from the 911's flat-six, but still capable of delivering impressive performance. This engine was renowned for its smooth and powerful delivery, making the 944 a joy to drive. While handling and roadholding were undeniably excellent, the 944 was praised for its build quality, reliability, and practicality. It offered more interior space than the 911, proving to be a capable daily driver.

The 1987 to 1991 period saw the 944 evolve considerably. Notable changes included the introduction of a larger 3.0-liter engine in the 944 S2 model, offering increased power and torque. Despite its more modest displacement compared to the 911, the 944's engine, coupled with the car's exceptional handling traits, allowed it to rival its higher-priced sibling in performance. During this period, the 944 also saw refinements in its suspension and braking systems, further enhancing its driving dynamics. The 944's success was further consolidated with the introduction of the 944 Turbo in 1985, offering a potent and exhilarating driving experience with its powerful turbocharged engine. The 944, with its unique blend of performance, practicality, and affordability, cemented its place as a highly sought-after and respected sports car, leaving an enduring legacy in the automotive world.