Mercedes 5 Cylinder 300D Non Turbo Diesel Valve Guide to Stem Seal Replacement Kit - 10 Seals

Fits 115 and 123 Chassis 300D, 300CD and 300TD with 5 cylinder NON turbo engines from 1976 up to 1981. If your 5 cylinder diesel has more than 200,000 miles on it without any major work, it most likely needs new valve stem seals. These rubber seals get worn and brittle with age and when they do oil can move down the valve stem and into the combustion chamber in turn causing excess smoke and oil consumption.

The good news is you can do this job without taking the cylinder head off and you do not need to use compressed air as you would with most gas engines. You don't even need to remove the camshaft. My stem seal kit includes clear step by step illustrated instructions along with my special press tool to keep from damaging the new seals during installation. It also includes a new valve cover gasket and five (5) extra valve adjusting nuts if you find a couple of yours rounded off.

This is an important job you can do successfully yourself on your own mature diesel engine. If you are planning to replace your timing chain this is a job you should do at the same time as you will already have your engine set up to do both. If your oil consumption is up and you are experiencing increased engine smoke especially at cold start up it is time to think about replacing these seals.

When replacing your valve cover you may need wave washers.