Do you have to adjust the valve clearance on a W123?
These old engines for the W123s don’t have automatic valve adjusting like later models and needs therefore regular adjustment. The valve clearance has to be exactly to specifications to ensure you get the peak performance out of the engine.
When to adjust the valves on a diesel engine?
The valve adjustment can be done when the engine is warm with different valve gap specifications, but I wouldn’t recommend it since you might burn yourself and the temperature of the engine would slowly get lower during the adjustment process so you have to be very quick about the adjustment.
How to adjust the valves on a diesel 617 engine?
Turn the upper nut clockwise to make the gap bigger and anti clockwise to make the gap smaller. It takes some tries to get it right the first time because the adjustment is very sensitive so just be patient and try a few times until it gets right.
What to do when all 10 valves are adjusted?
When all 10 valves are adjusted, replace the valve cover gasket to prevent leaks. Don’t over tighten the valve cover bolts, let the rubber gasket do the sealing and not brute force. Put all the other parts together and have a test drive, and most likely you will feel an increase in performance and acceleration.
How to adjust the valve on a Mercedes?
There are a couple of special wrenches, feeler gauge and new valve cover gasket that is needed. One car in as a Cadillac just because of the valve adjustment. This pictorial is the for the do-it-yourselfer, so follow along and lets adjust some valves……….
These old engines for the W123s don’t have automatic valve adjusting like later models and needs therefore regular adjustment. The valve clearance has to be exactly to specifications to ensure you get the peak performance out of the engine.
The valve adjustment can be done when the engine is warm with different valve gap specifications, but I wouldn’t recommend it since you might burn yourself and the temperature of the engine would slowly get lower during the adjustment process so you have to be very quick about the adjustment.
Where do I find the valve adjustment sheet?
Download the valve adjustment sheet here 5 cylinder sheet 4 cylinder sheet The specs for the adjustment are on the core support for your model. All the NON turbo 4cyl and 5cyl diesels use (.10mm or .004 inches) intake and (.30mm or .012 inches) exhaust.