NEF Engine N67 MNS M22 N67 MNT M28 Technical and Repair Manual T E C H N O L O G I C A L E X C E L L E N C E NOVEMBER 2006 EDITION 1. N67 MNS M22 N67 MNT M28 NOVEMBER 2006 In particular l.c an ua irm pa ere ic rv se We strongly recommend that you carefully read the indications contained in this document: compliance with them protects the engine against irregular operation and assures its reliability, safeguarding sea-going and maintenance personnel against accident hazards. The indications contained in this document pertain to the N67 MNS M22.10 or N67 MNS M22.11, N67 MNT M28.10 or N67 MNT M28.11 marine engine and complement the IVECO MOTORS-FPT publication of “Marine Diesel Engines Installation Handbook” that the reader should refer to for anything that is not explained herein. Technical engineers and fitters are required to comply with safety regulations on work. They have to implement and adopt the device required for individual personal safeguard while carrying out maintenance or checks. Safety rules are reported in Section 9 of this publication. Regulations on handling engine are reported at the end of Section 6 of this publication. In order to start the engine, strictly follow the procedure stated at the end of Section 5 of this publication. To get the best possible performance out of the engine, it is mandatory to conform with its intended mission profile. The engine must not be used for purposes other than those stated by the manufacturer. IVECO MOTORS-FPT is available beforehand to examine requirements for special installations, if any. om FOREWORD o Use of unsuitable fuels and oils may compromise the engine’s regular operation, reducing its performance, reliability and working life; o Exclusive use of IVECO Original Parts is a necessary condition to maintain the engine in its original integrity; o Any tampering, modifications, or use of non-original parts may jeopardize the safety of service personnel and boat users. To obtain spare parts, you must indicate: - - Commercial code, serial number and indications shown on the engine tag; Part number of the spare as per spare part catalog. The information provided below refer to engine characteristics that are current as of the publication date. IVECO MOTORS-FPT reserves the right to make modifications at any time and without advance notice, to meet technical or commercial requirements or to comply with local legal and regulatory requirements. We refuse all liability for any errors and omissions. The reader is reminded that the IVECO MOTORS-FPT Technical Assistance Network is always at the Customer’s side with its competence and professionalism. Publication IVECO MOTORS-FPT edited by: IVECO PowerTrain Advertising & Promotion Pregnana Milanese (MI) www.ivecomotors.com Printed P3D32N002 E - November 2006 Edition an ua SECTION CONTENTS l.c om N67 MNS M22 N67 MNT M28 NOVEMBER 2006 pa irm Section 1. Page OVERVIEW 2. TECHNICAL DATA 3. ELECTRICAL EQUIPMENT 4. DIAGNOSTICS 87 5. MAINTENANCE 97 6. SERVICING OPERATIONS ON INSTALLED ENGINE 103 7. TOOLS 115 8. OVERHAUL 123 9. SAFETY REGULATIONS 181 se rv ic e- re 1. 5 37 43 Indications for consultation Sections 1-2-3 are intended for sales personnel, to provide them with exact knowledge of the product’s characteristics and enable them to meet the Customer’s demands with precision. The remaining sections are meant for personnel in charge of carrying out ordinary and extraordinary maintenance; with an attentive consultation of the chapter devoted to diagnosing, they will also be able to provide an effective technical assistance service. N67 MNS M22 N67 MNT M28 OVERHAUL NOVEMBER 2006 8.123 SECTION 8 OVERHAUL Page Graph and symbols 125 GENERAL SPECIFICATIONS 126 CLEARANCE DATA 127 ENGINE OVERHAUL - ENGINE REMOVAL AT THE BENCH 133 Preface 133 Engine setting operations for the assembly on turning stand 133 Components removal 134 se rv ic ere pa irm an ua l.c om CYLINDER UNIT 140 Checks and measurements 142 Checking head supporting surface on cylinder unit 142 TIMING SYSTEM 143 Checking cam lift and pin alignment 143 Bushes 143 Bush replacement 144 Tappets 144 Fitting tappets - camshaft 145 OUTPUT SHAFT 146 Measuring journals and crankpins 146 Replacing oil pump control gear 149 Fitting main bearings 149 Finding journal clearance 149 Checking crankshaft shoulder clearance 150 CONNECTING ROD - PISTON ASSEMBLY 151 Measuring piston diameter 152 Piston pins 152 Conditions for proper pin-piston coupling 152 Split rings 152 (continues on next page) 8.124 N67 MNS M22 N67 MNT M28 OVERHAUL 153 Bushes 154 Checking connecting rods 154 Checking torsion 154 Checking bending 155 Fitting connecting rod-piston assembly Connecting rod piston coupling 155 pa irm an Connecting rods 156 ere Fitting split rings Checking piston protrusion rv se Finding crankpin clearance ic Fitting connecting rod-piston assembly into cylinder barrels CYLINDER HEAD 156 157 158 159 Removing the valves 159 Checking cylinder head wet seal 160 Checking cylinder head supporting surface 160 VALVES 161 Removing carbon deposits, checking and grinding valves 161 Checking clearance between valve stem and valve guide and valve centering 161 Valve guide 162 Regrinding - Replacing the valve seats 162 Valve springs 163 FITTING CYLINDER HEAD 163 INSTALLATION OF COMPONENTS 164 Refitting the cylinder head 172 Adjusting valve clearance 174 Adjusting injection pump phase 177 Completion of the engine 177 TIGHTENING TORQUES l.c om Page ua NOVEMBER 2006 178 N67 MNS M22 N67 MNT M28 OVERHAUL NOVEMBER 2006 8.133 ENGINE OVERHAUL - ENGINE REMOVAL AT THE BENCH Preface Figure 2 Part of the operations illustrated within this section can be partially executed while the engine is assembled on the boat, depending on the room available for access to the engine and on the equipment application as well. CAUTION All operations of engine disassembly operations as well as overhaul operations must be executed by qualified engineers provided with the specific tooling and equipment required. Operations described below refer to the engine without the components for its marine adaptation (see Section 6). 1 76147 o Assemble the bracket bearing 99361037 using the four screw threaded ports (1). Engine setting operations for the assembly on turning stand On the left hand side: l.c om The following operations are relating to the 4 cylinder engine but are similar and applicable for the 6 cylinder. o Remove the oil dipstick together with guide pipe (2); (loosen the guide pipe disassembling from the block); properly pipe the screw-threaded port to avoid inlet of foreign matters. se rv ic ere pa irm an ua Figure 1 o Remove the hose between sea water pump and heat exchanger; 2 1 1 76146 76145 On the right hand side: o Disassemble the starter; properly hold the starter (1) and loosen the fixing screws (2); o Assemble the second bracket 99361037 throughout the screw-threaded ports (1); o Disassemble oil filter. o Lift the engine using the rocker arm 99360595 and put it on the turning stand 99322205; CAUTION The oil filter contains inside approx. 1 kg of engine oil. Provide tank with enough capacity to contain the liquid. Avoid contact of engine oil with the skin: in case of skin contamination rinse in running water. Engine oil is highly pollutant: provide for disposal in compliance with the law and regulations in force. o Drain the oil through the cap underneath the plug. CAUTION Avoid contact of engine oil with the skin: in case of skin contamination rinse in running water. Engine oil is highly pollutant: provide for disposal in compliance with the law and regulations in force.
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