Even many old-time Mercedes diesel "experts" are surprised about this part. It is so unknown that it never gets replaced in the oil filter housing, meaning that almost all of them are no longer working today. Watch the video below, and Kent will explain its location and function.
Product Details
This thermostat comes with video instructions, but there are other tools and gaskets you will need if you successfully replace it on your OM617 diesel engine. Please see the related products below.
Related Products:
Diesel Oil Filter Housing Bolt Shaft Seals (O-rings)
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.
240D 300D 300CD 300TD 300SD Diesel Oil Filter Housing Leak Fix Kit
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.
1978 TO 1985 TURBO Diesel Oil Cooler Thermostat Kit
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.
W116 W123 W126 Chassis TURBO Diesel Oil Filter Housing Sealing Rings for Turbo Oil Supply Line
Set of two new aluminum washers as shown.
12mm Special Short Crow Foot Wrench For W116 W123 Diesel Oil Pressure Line
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.
Modified 22mm Open End Wrench for Oil Cooler Fittings
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.
616 617 Diesel Oil Cooler Line Removal Special 3 Wrench Set
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!
W116 and W123 Chassis Diesel Engine Oil Filter Housing Pressure Plate Gasket
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.
1977 TO 1985 Diesel Oil Cooler Thermostat Replacement Instructions - On Demand Video
This will be instructional information that you can not find anywhere else! The focus of the 25-minute video will be on removing and replacing the oil cooler thermostat once the oil filter housing is removed for a 1977 to 1985 engine ( excluding the 190D).
Late 616 617 4 and 5 Cylinder Diesel Oil Filter TWIN PACK (Code 2)
Fits 116, 123 and 126 chassis diesel 1977 to 1985 only. 240D 300D 300CD 300TD 300SD 1977 to 1985
1977 to 1985 Diesel Oil Filter Housing Plastic Check Valve Cone DIY Kit
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.
W116 W123 REBUILT TURBO DIESEL Oil Filter Housing with Install Kit
Only this one is available. Good used oil filter housing assembly with cap. Excellent stock studs. No original cap nuts are included. Kent had this apart for a video and decided to clean and rebuild it. He installed a new Genuine oil cooler thermostat and a good used black plastic check valve.