![]() If driving an older vehicle, or one with close to 100,000 miles, it is recommended to look for symptoms of the timing chain going bad or failing. Issues with the chain are common in higher mileage vehicles. The timing chain normally needs to be replaced between 80,000 and 120,000 miles unless there is a specific problem. When does a timing chain need to be replaced? Every time you use the engine, the timing chain is in use. The chain is located inside of the engine and needs to be lubricated by the oil in the engine, making oil maintenance important as well. Maybe the vacuum pump caused the camshaft to slip like that since the vacuum pump is spring loaded? Please help.A timing chain synchronizes the rotation of the crankshaft and camshaft(s) ensuring proper timing and allows the engine’s valves to open and close during each cylinder’s firing. I had all of my injectors out when I was changing the chain. I was able to feed a new chain in and rivet it. I don't understand how? Like I was turning it and at first it was going slowly and surely and then all of a sudden the camshaft gear goes clockwise fast.! So I keep turning it and it's turning fine and then again, the camshaft kind of slips and goes fast clockwise maybe 90 degrees while the crankshaft is stationary. While I was turning the crankshaft the chain kept skipping teeth and timing got messed up. I had a helper who was holding the old chain tightly while I was turning the crankshaft and feeding in new chain. I removed the tensioner, rocker arms, undid the old chain and connected a new chain to it. "I recently tried replacing my timing chain on om617 engine. They can both help with details, torque settings, and related procedures. I recommend you obtain the factory engine service manual and the Haynes manual for your engine. I have a short video that just gives an overview of the procedure on the V8 engine. It is a good idea to do this anyway after installing a new chain because that can affect both injection pump and distributor timing. At this point, you should check the injection pump timing on diesel engines and distributor timing on gas engines to make sure that did not move as well. Put the rocker arms back and re-install the tensioner if needed.ġ0. When you are sure the cam marks are lined up properly and the sprocket and the keyway on the end of the cam are lined up, you can push the sprocket back onto the cam and tighten the bolt back down.ĩ. Now you will have to carefully lower the sprocket away from the chain and move the sprocket the number of teeth you estimated you were off. While holding the chain tight with the sprocket ( I recommend a helper here) get and a big pair of pliers and rotate the cam until the cam marks line up again.Ĩ. If you do not have enough slack to pull the sprocket off the cam you will have to remove the chain tensioner.ħ. With the chain on the sprocket pull the sprocket off the end of the camshaft and do NOT let it drop nor let the chain move away from the teeth. ![]() Cover the hole with rags below the cam sprocket to prevent anything from falling down in the engine.Ħ. On diesel engines, you may have to remove the upper chain guide rail.ĥ. Now you will have to remove the bolt on the front of the camshaft in preparation for pulling the sprocket away from the camshaft. ![]() You do not want any valve spring pressure fighting against you when you go to turn the camshaft.Ĥ. Next, you have to remove the rocker arms for the camshaft you are going to move. Now, look at the cam or camshaft marks to see how many teeth they are off and which way you will need to turn the sprocket to get the marks lined up again.ģ. Begin by turning the engine over clockwise until you have number one cylinder coming up on compression stroke and align the timing marks on the front of the engine to be set at top dead center ( 0 or TDC)Ģ.
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