1978 to 1985 Turbo Diesel Oil Cooler Thermosat

Here is a critical little o-ring that is hard to find and hardly ever gets replaced. We recommend these get replaced every 3 or 4 oil changes.

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.

We know it is a surprise to many owners to discover there is a small thermostat inside the oil filter housing. Rather than write about it, watch the video below and Kent will explain the theory of operation and how to get it it.

Set of two new aluminum washers as shown. 

Getting that oil pressure line off the bottom of the oil filter housing on the 1977 to 1985 240D, 300D, 300TD, 300CD, and W116 300SD is tough. If you break the line or damage the nut, this part is no longer available new.

This custom-made thin head wrench by Kent Bergsma can save the day and your pocketbook.  It is very important that you hold the fitting base on the oil cooler when removing the oil cooler hoses. A regular 22mm wrench is almost always too thick and can also cause damage.

Replacing your oil cooler lines/hoses is a very important maintenance item on your older Mercedes diesel. Getting them on and off though is a different matter!

This gasket should be replaced when you remove the oil cooler housing to replace the main block gasket. These get old and hard and will leak due to age. Easy to do it on the bench. Not so easy to do it on the car. 

Fits 116, 123 and 126 chassis diesel 1977 to 1985 only. 240D 300D 300CD 300TD 300SD 1977 to 1985

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. Watch the video for a full explanation.