Question:
I got the van back to the garage were i stripped the head to find all the valves were bent. I therefor got a new set off valves ground them in, put a new gasket on and built it all back together with a new timing belt kit. I turned the engine by hand and all seemed fine. I then built it to the stage were i could run it only to find to knocking really badly!! I have done this process three times now with the same outcome everytime. I have put a thicker gasket on it shims cheked all my clerances and all seems fine apart from this hurrendis knocking. I have been asured that it is the correct type of valves for the van.
Any suggestions would be a great help.
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Answers:
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the gear wheels that the timing belt goes around NEED to be in a certain position before you put the belt on them so when you turn the engine the valves are not going to be struck by the pistons. The valves and timing belt you have bought are very likely the correct ones but the pistons could be out of time with the valve opening/closing and therefore the pistons could be striking the valves thus making the noise you are hearing. I strongly recommend getting the job finished by a qualified mechanic as they will have access to the relevant information needed to correct the positioning of the timing wheels hope this helps youA Valhalla eh? I suggest you give the Valkyries a call..
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I am assuming you have put the timing belt on correctly with all the timing marks properly aligned as i think you said it runs. It is possible that damage to the bottom end occurred when the pistons and valves were colliding immediately after the belt snapped and that this is the cause of the knocking.Hope not but it's a possibility
The timing marks sound as if there out?The camshaft should be locked by a special tool fitted where the vacuum pump is.The crank shaft lines up with a mark under the cover where the clutch is, and the pump has a mark lining up with the timing cover.The pump is spring loaded so its really a two person job, as 1 tooth out is the problem your describing.Can give more details if required
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assuming you lined the timing marks correctly (this should be first port of call) the you might also have bent the crank.if the timing belt goes and the engine is kept running or a few attempts have been made to start it, then sometimes it is better to fit a new top end, only needs a slight bend to knock everything off.
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valves on diesel need to be a set depth below the head face. otherwise they hit the pistons. if you fitted new valves to a machined head this is your problem it's called decking the valves. you do not fit thicker gasket on a diesel! piston protrusion denotes notch code for gasket! which determines the compression ratio thicker gasket reduces this and causes power loss + higher emissions see manualMore Questions & Answers ...
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