How to replace timing guide on Mercedes 560?
It would be a very good idea to secure the camshaft with a pair of channel locks. There are nubs in the center of the cam you can use to secure the cam but you must mind the camshaft oiling tube, it has plastic clips that can break very easy. Once the bolt is broken free it should thread out by hand.
How are timing chains used in a DOHC engine?
In some engines, such as a Chevy 3.4L DOHC V6, a timing chain is used to drive an intermediate sprocket that drives two belts (one for each cam). Timing belts and chains carry a heavy load. They have to turn the cam with enough force to overcome the resistance of all the valve springs.
What is the process of cylinder head resurfacing?
Cylinder head resurfacing, is a very common process today, especially with all the leaking head gaskets. Above all, cylinder head resurfacing, is the most common machining operation done in machine shops to date.
When does a cylinder head start to crack?
They are often designed to be lightweight which makes them easily susceptible to wear and damage over time. Often, cylinder heads will begin to crack after about 5 years. If the heads are made of aluminum, then they will certainly crack within this time frame. But if you have cylinder heads made of iron, they might be able to last a little longer.
Why is my Mercedes 560 timing chain not replacing?
These nylon guides are a well known problem with Mercedes if you do not replace them at their recommended service interval. Most often times it is the left drivers side inboard guide that will become brittle, fracture and then often times fall into the chain path.
How often should timing chain guides be replaced?
When the guide jams up in gears it usually causes serious and catastrophic engine failure that almost always bends the valves on the drivers side head and in real bad cases will even crack the valve cover! From everything I have seen these nylon guides should be replaced every 80,000 miles or every 10-15 years.
Can a 3 cylinder head guide be replaced?
For the reasons above many people will just replace the 3 cylinder head guides and “think” everything is fine when in reality, at the very least, one should spend the extra and purchase the “Tensioner guide rail” and also a new tensioner. All three cylinder head guides and tensioner guide rail are replaceable from the top of the engine.
Where are the hash marks on a Mercedes 560?
There should be a small hash mark in the center of the ignition rotor terminal, it should be aligned with a small hash mark in the distributor hosing. You can also use a marker to draw a line too. The distributor must be removed to access and remove the inboard left drivers side rail pins.
What should the timing marks be on a camshaft?
After you have installed your crankshaft and camshaftand connected the two with your timing set, take a moment to make sure you have your cam installed “straight up,” which means the tick marks on the timing gears point toward each other. At this point, the camshaft should be installed as your cam manufacturer intended.
How to check Mercedes Benz timing chain wear?
Turn the crankshaft clockwise until the 305-degree mark on the main pulley lines up with the mark on the engine case. The 305 stamps is printed on the pulley. Keep rotating the crankshaft clockwise until the 305 stamp comes up to the top.
There should be a small hash mark in the center of the ignition rotor terminal, it should be aligned with a small hash mark in the distributor hosing. You can also use a marker to draw a line too. The distributor must be removed to access and remove the inboard left drivers side rail pins.