TORSIONAL COUPLINGS LM COUPLING INSTALLATION INSTRUCTIONS 41 Installation Instructions The outer aluminium ring is bolted to the engine flywheel with tightening torque TA2 (see page 42) The driven hub is mounted on to the driven shaft. The rubber disc with the vulcanized ring is then assembled to the hub with screws, which must be tightened to the correct torque TA1 (SB. SC) or TA3 (SBE, SCE) as stated in the tables. Should Loctite or other anaerobic adhesives be used, apply a minimum only. The rubber - metal connection must not be wetted. For types SB with conical hub: The screws must be tightened alternately in several steps until they have all reached the correct tightening torque. The tightening torque of all screws must be checked all around. Secure axial fixing of the inner hub on the shaft has to be ensured. Allowable Misalignment The couplings can accommodate the following maximum misalignment: Axial: several millimetres (as stated in dimension table) Angular: 0.5° Parallel: 0.5 mm These values for angular and radial misalignment are based on 1500 rpm. For other speeds convert according to this graph. Since radial and angular misalignment cause relative movement, that means wear between the rubber elements and outer aluminium ring, it is advisable to keep the misalignment as low as possible - better than above values - in order to ensure long coupling life and smooth running. For non-flanged drives, we recommend the following effective range of maximum misalignment: Angular: 0.1° Parallel: 0.2 mm Above values are for continuous duty. For short periods (i.e. during starting and stopping the engine, at heavy sea, etc.) up to five times higher values for radial and angular misalignment are allowable. Alignment of Coupling The alignment of free mounted, non-flanged drives should be checked in the usual way by checking the radial and angular misalignment between driving and driven side with dial indicator. As a reference surface, the inner hub should be used on the driven side and on the other the flywheel or flywheel housing. If the engine is placed on flexible mounts then the alignment should be checked at the earliest, two days after the engine has been put on it’s flexible mounts, because only then will these mounts have taken most of their permanent set. In addition, the rigidly mount driven unit should be placed approximately 0.3 mm lower than the flexibly mounted engine. In this way, upon further setting of the engine a misalignment improvement can be achieved and the engine’s position, after some running time, will not be essentially lower than the driven unit. Further setting of the engine is thus anticipated and compensated if necessary. Ventilation The LM Torsional couplings are produced of special rubber which has a higher temperature resistance than normal rubber. However, it is a fact that all rubber becomes harder with time under the influence of high temperature and it’s mechanical properties are reduced. Therefore, it is always advantageous to ensure that the flange and flywheel housing have many large ventilation holes in order to provide adequate air flow. The temperature will then be reduced and the life of the coupling element considerably increased. #DriveLineHarmony www.jbj.co.uk/torsional-couplings.html
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