Simplified calculation methods of internal combustion engine screw joints are presented, with respect to screw fastenings of connecting rod bearing; crankshaft main bearing and fuel pump camshaft bearing. Design criteria for proper bolt dimensioning and tightening force estimate as conditions for screw joint safety are discussed.

Among all engine auxiliary units a cooling fan is the noisiest. There are two mechanisms that generate the overall noise of the fan: the rotational and non-rotational one. These mechanisms depend on the fans geometry and operation conditions. The rotational noise is characterized by a broadband noise and superimposed discrete frequency tones. The superimposed tones are linked with the blade passage frequency and its higher harmonics. In heavily loaded conditions (at the lower flow rate) non-rotational noise is found to be prevailing. The non-rotational noise spectrum has a peak at frequency that is not related to the rotational speed or blade passage frequency. Rotational noise is mainly the consequence of the fluctuating forces on the rotor blades and is provoked by the interaction of the rotor blades with the nearby stationary objects. Non-rotational noise is caused by: a) laminar boundary layer vortex shedding, b) blade interaction with the tip clearance vortex and c) blade stall. The goal of this paper is highlight all these noise generating mechanisms caused by axial fans in IC engines cooling applications.

The paper deals with a review of importance of motor cars in the transport and economic system of Croatia with reference to the progressive nations. The review then covers the course of studies fora degree provided by the Department of Engines and Vehicles of the Zagreb University Faculty of Mechanical Engineering and Naval Architecture since the institution of the Engineering School in 1919 to the present. The paper presents the courses of graduate and postgraduate studies. A statistical review is provided of the number of students that have been conferred a Bachelor's, Master's or Doctor's degree in the field of transportation means.

The paper presents an analytical method for determining optimal number of servicer in a big repair workshop. This method is based on the theory of mass servicing (TMS). A short description of basic concept, principles and limitations of this theory is given. The adequate mathematical model is created on the concrete examples of the mass servicing system (MSS). On the basis of this mathematical model, the quantitative characteristics for all variants of MSS are defined and analyzed. Finally, the most important quantitative characteristics, basic parameters of the optimization goals and an optimal solution for analyzed variants are presented and discussed