If I take the cams off the crank turns fine...when I put the cams on the crank is really hard to turn. Obviously it will not fire up due to this...Here is the thing....The tensioner (left looking at the engine from the front) now has groves in it. Looks like when I tried to start the car and also turned it bad hand (only half rotations at a time) that I am digging into it. Why would that happen? What am I not doing correctly or overlooking?
1993 240sx 5spd DOHCno upgrades no nothing.
Crank will not turn with cams on>>>
the tensioner should have spring action to it, make sure you intalled it correctly. the chain normally touches this but does not dig into it.
the tensioner has a small spring mechanism to help it maintain slight pressure on the chain, i saw a post before about someone who couldnt get that peice to pop in, maybe your tensioner isnt in properly. this is the slack side with the curved one (which is the one i assume your talking about)
now, if your turning the engine the wrong way you are making the slack side be the side with tension so it will dig into it then. does it dig into it when you turn it either way?
the tensioner has a small spring mechanism to help it maintain slight pressure on the chain, i saw a post before about someone who couldnt get that peice to pop in, maybe your tensioner isnt in properly. this is the slack side with the curved one (which is the one i assume your talking about)
now, if your turning the engine the wrong way you are making the slack side be the side with tension so it will dig into it then. does it dig into it when you turn it either way?
1) I am turing the correct way....might have turned it wrong way and that could ahve caused the groves previously and I am just noticing it.
2) Would there be an issue if I used 2 intake cams or 2 exhaust cams. how different are the lobes? Is it staggered from the factory?
3) Cams not properly lined up? The lobes are on the discs. I torqued them down in order. I did notice whe I went to take the cams off again the driver side (exhaust) cam did not want to come out. This is leading me to believe that is the issue.
4) I have to intake cams on it right now. Is that a big issues? My exhaust broke and then when I bought a set from a guy on here the exhasut was broke in the shipping. Not worried about performance as I am only using this as my daily right now till I decide to do a KA Turbo or drop my VG30DETT in it
Thanks guys.
2) Would there be an issue if I used 2 intake cams or 2 exhaust cams. how different are the lobes? Is it staggered from the factory?
3) Cams not properly lined up? The lobes are on the discs. I torqued them down in order. I did notice whe I went to take the cams off again the driver side (exhaust) cam did not want to come out. This is leading me to believe that is the issue.
4) I have to intake cams on it right now. Is that a big issues? My exhaust broke and then when I bought a set from a guy on here the exhasut was broke in the shipping. Not worried about performance as I am only using this as my daily right now till I decide to do a KA Turbo or drop my VG30DETT in it
Thanks guys.
2) YES!!! BIG ISSUE.
You have got to be careful here. I don't want to sound like an ***, but you really need to know what you're doing or you will bend your valves and you'll have to remove the head to replace them. Please stop all work and step back and think about how the valvetrain works. Even bolting down the camshafts if they're in the wrong place can cause a bending of the valves!Another thing is that the bearings you unbolt have to go back in the EXACT same location and orientations. If the camshaft is binding, it sounds like the bearings might be mixed up. They are match-honed to provide the bare amount of clearance required for oil passage while keeping all bearings in a straight line.You simply cannot replace camshafts unless you adjust for the different axes locations relative to the rockers. In other words, if you swap camshafts, you can NOT line up the timing marks and expect the valves to open at the right time or to not hit the pistons. Also, for all I know the bearing sizes might be different, and that might be why it's not fitting right. I'm certain that the lobes are shaped differently. You could not expect the car to run with 2 exhaust cams or 2 intake cams, even if you compensate for the offset axis timing.
You have got to be careful here. I don't want to sound like an ***, but you really need to know what you're doing or you will bend your valves and you'll have to remove the head to replace them. Please stop all work and step back and think about how the valvetrain works. Even bolting down the camshafts if they're in the wrong place can cause a bending of the valves!Another thing is that the bearings you unbolt have to go back in the EXACT same location and orientations. If the camshaft is binding, it sounds like the bearings might be mixed up. They are match-honed to provide the bare amount of clearance required for oil passage while keeping all bearings in a straight line.You simply cannot replace camshafts unless you adjust for the different axes locations relative to the rockers. In other words, if you swap camshafts, you can NOT line up the timing marks and expect the valves to open at the right time or to not hit the pistons. Also, for all I know the bearing sizes might be different, and that might be why it's not fitting right. I'm certain that the lobes are shaped differently. You could not expect the car to run with 2 exhaust cams or 2 intake cams, even if you compensate for the offset axis timing.
intersting. Did not think that using the same type of camshaft would lead to that big of an issue but I am guessing it is more due to the nature of timing since the timing marks are different on the pulley. That I can see...and can see why the car did not start. As far as the bearings I realize that and using them in the exact order they came off so that is not the issue. It sounds to be an issue with bearing and "replacemnt" cam...not having the same wear and the bearing may be holding the cam or "siezing" it. I will look into it more. I appreciate the info.