We are plumbers, and we spend our day chasing leaks. This one is quite satisfying to rectify, as it is one of the culprits that causes the seemingly never ending flow of oil out of the back of a 948 engine and onto your driveway.
Above is a photo of the back plate of a 948 A series engine. The thumb points to the oil pump cover, which is soldered or brazed onto the back plate.
The joint fails.
Next time your engine is out, look closely for oil trails above the crank. Oil often leaks from this oil pump cover and down the back plate, (where it unites with oil already leaking from the rear main seal).
People routinely blame the rear seal for the oil they find on the floor of their garage. And leak they do. But they have help. Stamp out dog dish oil leaks. Check yours next time you remove your engine.
In the video below, we demonstrate how to use a high pressure blow gun and soapy water to test the union between dog dish and back plate. Once repaired, rear engine oil leaks are reduced and occasionally eliminated.
Try to save your exisiting oil pump cover. (They are sometimes pin-holed too!) We have them in our catalog but for 1275 engines only. They are not available for 948 and 1098 engines.