Models Affected: BMW 118D, 120D, 123D, 220D, 318D, 320D, 420D, 520D, X1, X3, X5
Engines: N47D20C, N47D20A-B, N47D20D
Years: 2007 – 2017
The team here at Southside Cylinder Heads have come across a variation between head gaskets on the BMW N47 Diesel Engines. Both head gaskets look nearly identical however they are not interchangeable and using the wrong gasket will result in oil being pushed into the cooling system.
The information in regards to which gasket suits which exact model is confusing and difficult to decipher, so the best advice we can give is check very carefully against your old head gasket before fitting the new one. Below is some pictures to help pinpoint where to look for the differences between the two. It is the area in the middle that causes the problems, there is an oil feed that is blocked on one gasket (bottom picture) and the other gasket doesn’t have this extra piece on the edge to block the feed, and also has a different position for the water jacket holes in that area.
So far the problem has been identified in the N47D20C engine series, however we would also advise caution when dealing with the N47D20A-B and N47d20D engines. If you need any further information call Southside Cylinder Heads on (07) 33435899. The cylinder head and engine reconditioning experts servicing Brisbane and Australia wide.