mayo in rocker cover

Hi, my B30A started to produce a lot of creamy mayo in the rocker cover for about 2 months. There is no oil in the cooling water and vice-versa. The car works fine and doesnt seem to use water. Any idea? Thanks, Laurent

Are you using the car much? Any long journeys? If not, take it for a blast down the motorway - it's a build up of condensation caused by short journeys...

Thanks for quick answer. The car is used daily by my wife to do about 30 miles in slow Devon lanes. I thought about condensation, but in 20 years of motoring, I never saw such a large quantity of mayo. When I removed the cover last Sunday, it was all covered with a 4/5 mm of the stuff !!! I ll try to give it a good run and see. Thanks, Laurent

Flush 

Flush and change oil might help.

It is a South African built 164, and, among other oddities, the crankcase ventilation inlet is not on the distributor side of the engine but I dont know where. Anybody any clue ? Thanks all for your help, Laurent

Do you mean the fitting for the oiltrap is plugged off? Or is there no possibility to put a oiltrap as there is no fitting? There must be some kind of crankcase ventilation, check for a hose running from the airintake and follow that.

Hi, the crankcase ventilation on early B30 engine was different. It consisted of 2 pipes on the rocker cover, one air inlet and one oily gases outlet. The system was not very efficient because of condensation/mayo build up and I found out in that Volvo issued a bulletin to modify these engines with the side oil trap. I am going to try that, and hopefully, that will be the end of the mayo in my engine.....