All engine gaskets should always be replaced during an overhaul. The easiest way to do this is to lubricate the gaskets with a little grease to make them stick to the housing and prevent them from being bent or damaged during installation. Sealing compound is only necessary if the housing is defective (scores in the sealing surface or similar). If a healthy motor housing drips nevertheless, it is usually strained or crooked. A strained housing is caused by unevenly tightened housing screws. Ideally the housing halves should be tightened evenly (crosswise!) with a torque wrench. The maximum value here is after 6-8NM. A crooked housing is also often the cause of dripping motors. Mostly these are motors that have been welded before. Only a few specialist welding companies take care of a technically correct preheating and cooling of the housing. The biggest mistake is to make a welding operation on individual halves. Whenever possible, both halves should be held together with all motor bolts! Another common cause for leaking engines are defective O-rings. Small rubber rings, which usually lie in a groove made for them, seal corresponding components in the same way as the shaft seals.
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