Bit of camshaft help.
Discussion
Ok, i got the head back from the engineers but he didnt have time to pout the hydraulic tappets back in or the camshaft followers.
Ive taken the cam off and put the tappets back in, however the lifters didnt seem to click on, they just seemed to rest on top of the tappet and the top of the valve on the other side.
I put the cam back on and tightened it up, it then seems to hold the followers into place with the pressure of the cam, i assume this is correct.
I tried to turn the cam but it took a lot of force for me to do so. When i turn it, it makes a loud 'click' (even a bang you could describe it as). Its making this noise as i assume the cam is putting pressure on the valves, and this is done usually by the engine (i had to use the sprocket bolt and a wrench to get the cam to turn)
Does this sound about right? The haynes manual isnt really helping either.
The next downer is i cant remember if what position the cam was in when i took it off. Ive got a rough idea but im not totally certain. Im sure this is going to be a problem but cant figure out in my head how to get it exactly right, because even when it goes back on, it wont be lining it up with the sprocket marks will i?
Ive taken the cam off and put the tappets back in, however the lifters didnt seem to click on, they just seemed to rest on top of the tappet and the top of the valve on the other side.
I put the cam back on and tightened it up, it then seems to hold the followers into place with the pressure of the cam, i assume this is correct.
I tried to turn the cam but it took a lot of force for me to do so. When i turn it, it makes a loud 'click' (even a bang you could describe it as). Its making this noise as i assume the cam is putting pressure on the valves, and this is done usually by the engine (i had to use the sprocket bolt and a wrench to get the cam to turn)
Does this sound about right? The haynes manual isnt really helping either.
The next downer is i cant remember if what position the cam was in when i took it off. Ive got a rough idea but im not totally certain. Im sure this is going to be a problem but cant figure out in my head how to get it exactly right, because even when it goes back on, it wont be lining it up with the sprocket marks will i?
Sorry, i should clarify, i've got the head in my kitchen at the moment. Now, using the bolt from the sprocket, i can screw that into the cam and turn it using a large wrench.
When i turn it (as the sprocket would turn the cam as it is driven by the chain) there is a lot of resistance, however when it does turn, its goes quite stiff, makes a big clunk, become a bit easier, then a bit stiffer, then a big clunk. The clunk doesnt sound very reassuring but im assuming because the engine spins the cams much faster than i can turn it, you wouldnt notice.
When i turn it (as the sprocket would turn the cam as it is driven by the chain) there is a lot of resistance, however when it does turn, its goes quite stiff, makes a big clunk, become a bit easier, then a bit stiffer, then a big clunk. The clunk doesnt sound very reassuring but im assuming because the engine spins the cams much faster than i can turn it, you wouldnt notice.
I think you might be right actually, i was paranoid i had tightened the bearing caps too much and the cam was forcing against them or something daft.
My timing fear is over anyway, i only just noticed grooves on the end of the cam where the sprockets click in to. I know the timing chain on the car is all set up still and cable tied in place, so its just a case of turning the cam once or twice to get it in line.
My timing fear is over anyway, i only just noticed grooves on the end of the cam where the sprockets click in to. I know the timing chain on the car is all set up still and cable tied in place, so its just a case of turning the cam once or twice to get it in line.
It will be stiff, as the cam is having to compress the valve springs.
I dont recommend turning it too much by using the sprocket retaining bolt, as you may be exceeding the torque that the bolt was designed for.
Also, the cam etc are usually lubricated when the engine is running, so I would leave things as they are if you are sure that you have assembled everything correctly.
Sorry I can't help with the cam timing.
Tim
I dont recommend turning it too much by using the sprocket retaining bolt, as you may be exceeding the torque that the bolt was designed for.
Also, the cam etc are usually lubricated when the engine is running, so I would leave things as they are if you are sure that you have assembled everything correctly.
Sorry I can't help with the cam timing.
Tim
grgrgray said:
Could it be a valve hitting a piston? if your turning the camshaft but not the engine then this is likely. you need to fit the cambelt with the correct timing then turn it before you cause (more) damage
That's quite unlikely as he's got the head off and is doing this by hand in his kitchen.It's most likely valves slapping closed.
Are the tappets hydraulic or solid?
C
NHK244V said:
99%% it's the valve slaming shut, as your turning the cam one way there's no pressure holding the cam back to stop the valve spring pushing the lobe up and advancing the cam fast enough to let the valbe slam shut, usually the chaim would stop this happening if it was fitted.
The other 7 valve springs would be stopping the cam reciprocating by itself - I've never heard of a valve slam shut unless the cam lobe profile was triangular!Maybe I don't quite get your post...
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