This is the complete Genuine Assembly as shown. No longer available new NLA.
For the OM616 and OM617 engines in the W116 and W126 300Sd and the W123 4 and 5 cylinder diesels. When you remove your oil filter housing be sure to check this part. Replace it if it is broken or not seating properly. This will cause the oil filter housing to not hold oil. Watch the video for a full explanation.
1977 to 1985 Diesel Oil Filter Housing Plastic Check Valve Assembly - USED
$65.00
SKU:
DSL-CVCONEAASY 
Product Details
You can replace it by using a pair of long 90 degree bent needle nose pliers.
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$38.50
240D 300D 300CD 300TD 300SD Diesel Oil Filter Housing Leak Fix Kit
A VERY common leak! Don't use paper gaskets or it will come back. GENUINE steel reinforced gasket is No longer made! We are the only source for OE-reinforced waffle gaskets!!
This kit fits ALL 116, 123 and 126 4 and 5 cylinder diesels, 616 and 617 designation. This is one of the most common oil leaks on the older Mercedes diesels from 1977 to 1985. It is often found at the gasket between the engine block and the oil filter housing.