Q: How to check and replace engine mounts on 2.4L four cylinder Nissan Frontier?A: Engine mounts rarely need attention, but they should be replaced immediately if they are broken or deteriorated in order to prevent additional strain on the driveline which could lead to damage or wear. The engine must be raised slightly during this inspection so as to unload the load off the engine mounts. This requires lifting the vehicle and securing it firmly on jackstands, taking off splash shields and placing a jack under the oil pan of the engine. A big piece of wood should also be placed between the jack head and oil pan, after which, the engine is gently lifted until it just takes up its weight off the mounts. Thereafter, one should check for any cracked, hardened or separated rubber of the mounts. It is also necessary to check whether there's relative movement between mount plates and engine or frame; in case such occurrence is noted then lower engine before tightening mount fasteners. Rubber preservative should be used on mounts to slow down wear and tear. If it needs replacing then remove cable from negative terminal of battery, set parking brake & block rear wheels. The front of car should then be raised and conclusively supported through use of jack stands while removing splash shields from beneath it. Engine mount-to-frame bolts together with engine mount-to-mount bracket retaining nut are removed followed by attaching an engine hoist onto top part of engine for lifting purposes only. Slightly raise the motor until you can pull out its mount from underneath your vehicle. To detach this bracket from your motor, you will have to remove four retaining bolts that hold each piece down to each side of your motor. Reverse these steps in order to install it with heat shields over each mounting location and use thread locking compound on mounting nuts prior to torquing them specifically tight.