1977 to 1985 Diesel Engine Critical Coolant Service Kit

Fits 115 116 123 and 126 chassis diesel engines, non turbo and turbo, to 1985. This includes the 220D, 240D, 300D 300TD wagon and 300D/300SD turbo engines. Most thermostats only last a few years and should be changed for optimal diesel performance.

When replacing the thermostat in your order diesel you may end up fitting a lot of corrosion. This kit will help you make sure you do not have any leaks when you install the new thermostat and will prevent corrosion of the housing bolts in the future.

ALERT! ALERT! 10 years after I first started warning about this, I saw it again in my shop on Feb. 20, 2011. Seems to be happening even more now as these radiators age. I loosened up the upper hose clamp on this 123 300TD radiator and it just fell off.

Fits 116 123 and 126 chassis diesel engines from 1977 to 1985. This includes the 240D, 300D, 300TD and 300D/300SD turbo engines. This short coolant hose is located right below your engine thermostat housing. Replacing it requires removal of the thermostat housing from the cylinder head.

Replace your old worn and weak expansion tank cap to eliminate minor coolant loss problems. Watch the video below as Kent will explain the difference in caps and why you want to make sure you purchase the correct one. 

This is a very important maintenance item for 126 300SD 5 cylinder turbo diesel owners. When these belts get loose or worn they can cause all kinds of problems like poor battery charging, engine overheating, jerky power steering, and noises that range from squeaking to rattling.

This is a very important maintenance item for all 116 and 123 chassis 617 5-cylinder turbo diesel owners.

Here is another diesel item I strongly believe should be replaced as a preventative measure. Water pumps do not last forever and when they go, it is usually when you are on a trip - right? I feel they should be changed every 100,000 miles.

8/2022 Update: We have modifed a new wrench for this kit so it may not look the same as that shown in previous YouTube videos, but it will do the same or even better job! We do sell the water pumps individually, but we decided to offer this complete kit to make a diesel pump installation go easie

New set of upper and lower radiator hoses that fit 1981 to 1985 300SD, 1981 to 1985 300TD, and 1982 to 1985 300D and CD (turbo engines only). NOTE: Does fit SOME late-model 240D.

We include a chaffing guard for the lower hose.

This is a great solution to what is sometimes a nagging problem. This heavy duty and flexible and adjustable plastic spacer can be put on the top or bottom radiator to prevent chafing in and area where it might come in contact the the engine or the radiator.

Have you ever had a hard time finally a very small coolant leak? Do you find yourself adding small amounts of coolant but can not see any leak? Is there a funny smell coming from inside your Benz when you run the heater?

Kent finally went to work to solve the problem of rusty water pump mounting bolts. Once the problem was studied carefully the solution became obvious. Watch the video for a full explanation and partial instructions below.

Kit contents:

Includes Kent's four detailed videos on every aspect of this job! This is now becoming one of the most common oil leaks in 1968 to 1985 diesel engines. Let's face it.

This is now becoming one of the most common oil leaks in 1968 to 1985 diesel engines. Let's face it. These engines are getting older and the rubber seal is wearing and becoming more brittle with time.

This is that little vacuum valve that always gets it nipples broken off... It is located right behind your thermostat housing on the 1981 to 1985 turbo diesel engines. It controls vacuum going to your EGR valve.

Good used part as shown.  There are no stripped bolts in the housing. Even the balance tube banjo bolt threads are super. Hose nipples have a couple pits in them. Should be ok as is or you can sand and fill the pits with JB weld.