PICTURES!
#16
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Originally Posted by Geo
Guys, that's not 180* off. Remember, the crank rotates twice for each rotation of the cam. The crankshaft just needs to rotate one more time.
#21
Race Director
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Originally Posted by kennycoulter
but isnt this picture showing the rotor pointing at number 1 ctlinder? or do these engines work differently than u.s. muscle cars?
I always use the cam gear to set the number one cylinder to TDC rather than the flywheel just because of this reason. Once you get it close you can then get it exact using the flywheel.
It works exactly like US muscle cars and all other conventional four-cycle engines.
#22
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Originally Posted by Karl2bdc
If you look at the first picture he posted, yes, the cam gear is off 180 degrees. The red dot as he put it, should be at the 1 o clock position, not the 7 o clock position.
2. Slap forehead.
3. Say "DOH!"
#23
Race Director
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Come on guys, don't you know how a four-cycle engine works? The crankshaft just needs to be rotated one more time.
Or is that what you guys are saying? It's not a problem with the engine, just that the engine must be rotated once more.
It sure sounds like at least some of you are sying there is a problem. There is not.
Or is that what you guys are saying? It's not a problem with the engine, just that the engine must be rotated once more.
It sure sounds like at least some of you are sying there is a problem. There is not.
#24
Race Car
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Geo,
I think that what others are saying is not that it is wrong BUT the marks are there to make it easy. If Kenny wanted to take a ruler and put a new mark on the EXACT opposite side of the gear it might be easier. However that could be tough to.
It would be easiest if he removed the belt lined up TDC on the flywheel, turned the cam to the timing mark and put the belt back on. Just a thought.
I am not sure what the story is with the rest of the posts but where I was coming from was his photo # 1 with no belt on. Just spin the cam..
Michael
I think that what others are saying is not that it is wrong BUT the marks are there to make it easy. If Kenny wanted to take a ruler and put a new mark on the EXACT opposite side of the gear it might be easier. However that could be tough to.
It would be easiest if he removed the belt lined up TDC on the flywheel, turned the cam to the timing mark and put the belt back on. Just a thought.
I am not sure what the story is with the rest of the posts but where I was coming from was his photo # 1 with no belt on. Just spin the cam..
Michael
#26
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Originally Posted by michaelathome
Geo,
I think that what others are saying is not that it is wrong BUT the marks are there to make it easy. If Kenny wanted to take a ruler and put a new mark on the EXACT opposite side of the gear it might be easier. However that could be tough to.
It would be easiest if he removed the belt lined up TDC on the flywheel, turned the cam to the timing mark and put the belt back on. Just a thought.
I am not sure what the story is with the rest of the posts but where I was coming from was his photo # 1 with no belt on. Just spin the cam..
Michael
I think that what others are saying is not that it is wrong BUT the marks are there to make it easy. If Kenny wanted to take a ruler and put a new mark on the EXACT opposite side of the gear it might be easier. However that could be tough to.
It would be easiest if he removed the belt lined up TDC on the flywheel, turned the cam to the timing mark and put the belt back on. Just a thought.
I am not sure what the story is with the rest of the posts but where I was coming from was his photo # 1 with no belt on. Just spin the cam..
Michael
All ALL he has to do is to rotate the crankshaft 360°. That will rotate the camshaft 180°. All will be good and right with the world. OK, I lied about that last part, but one can hope, right?
The point is nothing is out of alignment, it's just the crankshaft must rotate one more time. It would be a disaster to rotate the crank independently of the cam. It appears to be all lined up correctly already, or close enough to rotate the crankshaft. I guarantee you if you disconnect the timing belt and rotate the crank independently of the cam, you WILL bend valves. You only do this when the cam housing is off the car, but there is NO reason to do it in this case.
#27
Race Car
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Geo,
I get what you are saying. IF it is on correctly DO NOT take it off. TURN BOTH the CRANK and the cam TOGETHER! If NOTHING changed when he pulled the belt we are OK. LEAVE IT AS IS. now I get it.
I guess where I was coming from was that where I am at w/my engine (bent valves, damn PO) it didn't really make a difference. I could turn cam without impact (there was of course resistance from compression and springs).![Wink](https://rennlist.com/forums/images/smilies/wink.gif)
Here is a question, is there some point in the crank rotation that you can spin the cam without impact? I am pretty sure that there has got to be someplace. I know that it will work the other way around, as I was doing it. The pistons had pushed the valves to a location where there was no longer interference between the pistons and valves and crank spun w/out further impact. Please just don't ask how many times I tried to turn it over w/out a working belt![Wink](https://rennlist.com/forums/images/smilies/wink.gif)
Michael
I get what you are saying. IF it is on correctly DO NOT take it off. TURN BOTH the CRANK and the cam TOGETHER! If NOTHING changed when he pulled the belt we are OK. LEAVE IT AS IS. now I get it.
I guess where I was coming from was that where I am at w/my engine (bent valves, damn PO) it didn't really make a difference. I could turn cam without impact (there was of course resistance from compression and springs).
![Wink](https://rennlist.com/forums/images/smilies/wink.gif)
Here is a question, is there some point in the crank rotation that you can spin the cam without impact? I am pretty sure that there has got to be someplace. I know that it will work the other way around, as I was doing it. The pistons had pushed the valves to a location where there was no longer interference between the pistons and valves and crank spun w/out further impact. Please just don't ask how many times I tried to turn it over w/out a working belt
![Wink](https://rennlist.com/forums/images/smilies/wink.gif)
Michael
Last edited by michaelathome; 03-07-2005 at 10:14 PM.
#28
Burning Brakes
Join Date: Feb 2004
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Originally Posted by Geo
No, no no!
All ALL he has to do is to rotate the crankshaft 360°. That will rotate the camshaft 180°. All will be good and right with the world. OK, I lied about that last part, but one can hope, right?
All ALL he has to do is to rotate the crankshaft 360°. That will rotate the camshaft 180°. All will be good and right with the world. OK, I lied about that last part, but one can hope, right?
#29
Race Director
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I rather doubt it's possible to turn the cam by hand while the cam tower is installed. There will always or almost always be a point there there is much tension on the cam from the valve springs.
Actually, it's pretty amazing how hard it can be to turn the cam (or crankshaft). It gives you appreciation for how much power is lost to friction and stiff valve springs.
Actually, it's pretty amazing how hard it can be to turn the cam (or crankshaft). It gives you appreciation for how much power is lost to friction and stiff valve springs.