The engine is at TDC, but I can't seem to get the cams rotated right. It seems that the valves are contacting piston no. 4. I'm going by the marked links on the chain, and the first lobes (over piston 1) are pointed outwards (10 o'clock and 2 o'clock) and away from each other.
Crankshaft pulley is at tick no. 2 from the left; piston no.1 at top of cylinder.
I'll get the cams both on the chain, on their marks, with the chain not attached to idler sprocket. So I turn the pistons over to TDC (upper chain not engaged) but the pistons keep contacting valves (or so I believe; I am unable to move the crankshaft pulley any farther, there is a force against it. No. 4 piston is at top, and valves are almost fully depressed, meaning they are contacting the piston)
Sorry for all the info, just wanted you to get an exact idea. Post pix later if need be.
Oh, and btw, there isn't really a difference between compression stroke and exhaust stroke for the pistons right? It's either up, or down, right?
Cam sprockets not installing right
Re: Cam sprockets not installing right (VanNelson)
Might need a little background on how you got to this point and maybe a picture would help. this is the 93 240-KA? You should also be lining up the marks on the cam sprockets too? Down load the FSM--it has allot of good pictures.
Re: Cam sprockets not installing right (rotorimp)
Yes, it's the '93 240sx [KA24DE]
This is a new head, and the valves/cams came with it. The engine is at TDC, but the valves keep hitting the piston (no. 4) when I try to align the cams and their marks.
^The sprockets are lined up before I turn the engine over to TDC (upper chain is not engaged on the idler sprocket). You can see the marks on the sprockets, and the chain.
^Cam positions corresponding to previous picture (correct cam alignment)
Now, trying to turn the engine to TDC doesn't work, because the 4th piston valves hit the piston.
^This is the closest to correct the cams can get before the valves and pistons touch (actually, I think they are touching, it's that close). The exhaust cam is about 1-2 teeth ahead of its mark.
^Cam positions corresponding to previous picture.
Do you guys think the engine can run (correctly) with the cams like this. If I can crank the engine over by hand and it won't hit anything I suppose i'll try and start it up...
This is a new head, and the valves/cams came with it. The engine is at TDC, but the valves keep hitting the piston (no. 4) when I try to align the cams and their marks.
^The sprockets are lined up before I turn the engine over to TDC (upper chain is not engaged on the idler sprocket). You can see the marks on the sprockets, and the chain.
^Cam positions corresponding to previous picture (correct cam alignment)
Now, trying to turn the engine to TDC doesn't work, because the 4th piston valves hit the piston.
^This is the closest to correct the cams can get before the valves and pistons touch (actually, I think they are touching, it's that close). The exhaust cam is about 1-2 teeth ahead of its mark.
^Cam positions corresponding to previous picture.
Do you guys think the engine can run (correctly) with the cams like this. If I can crank the engine over by hand and it won't hit anything I suppose i'll try and start it up...
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LayNLow240
- Posts: 1017
- Joined: Mon Oct 10, 2005 6:20 pm
- Car: 92 240 coupe
TDC compression stroke has the crank pully aligned with the pin on the second mark from the right, and the #1 cam lobes should be pointing directly away from each other. in the picture they are not 100% correct. <- -> < and> being the lobes and the direction they are pointed. when they say the thing about 10 and 2 they are talking about the dots on the cam gears. fix that and you should be good to go.
Re: Cam sprockets not installing right (VanNelson)
Is your car up and running yet?
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LayNLow240
- Posts: 1017
- Joined: Mon Oct 10, 2005 6:20 pm
- Car: 92 240 coupe
Re: (LayNLow240)
Unfortunately I wasn't able to match up the timing marks on the cams and have the engine at TDC. It seems to be accepted knowledge that the cams must point opposite of each other, so I put them as close as I could to make them opposite. I then turned the engine over by hand to make sure everything cleared, and it did. So i'm putting everything back together, ensuring dist. was at TDC, also the crank, and we'll see if she starts up. If not, it'll probably be the timing, which I can just pop the cover off and adjust. Everything cleared when I hand cranked it, so nothing should get damaged if I crank the engine by key.
I work 11-7 everyday, so I can only work on the car at night (f***ing BLOWS), so sorry if my progress is a bit... slow.
I work 11-7 everyday, so I can only work on the car at night (f***ing BLOWS), so sorry if my progress is a bit... slow.
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LayNLow240
- Posts: 1017
- Joined: Mon Oct 10, 2005 6:20 pm
- Car: 92 240 coupe
Re: (VanNelson)
well thats a good start. i hope to hell i can get my cams back where they should be when i finish up my valve stem job.nice lookin head btw! nice n clean. is everything lubed up in the head? or do you know? im going to go crazy with engine assy lube when i start putting mine back together to make sure everything is lubed upon first start.VanNelson wrote:Unfortunately I wasn't able to match up the timing marks on the cams and have the engine at TDC. It seems to be accepted knowledge that the cams must point opposite of each other, so I put them as close as I could to make them opposite. I then turned the engine over by hand to make sure everything cleared, and it did. So i'm putting everything back together, ensuring dist. was at TDC, also the crank, and we'll see if she starts up. If not, it'll probably be the timing, which I can just pop the cover off and adjust. Everything cleared when I hand cranked it, so nothing should get damaged if I crank the engine by key.
I work 11-7 everyday, so I can only work on the car at night (f***ing BLOWS), so sorry if my progress is a bit... slow.
Re: (LayNLow240)
Better be clean, it's brand new! And as for lube, yes, I lube everything, everytime, everywhere.
Car doesn't start. It's cranking, but doesn't start. I'll troubleshoot tomorrow.
Lol, the first time I cranked it, I had my brother do it. Oil gushed out of the engine, and i'm like "Son-of-a-B****!", figuring I had a plethora of more problems. Nope. Forgot to install the oil filter.
I'm kinda happy i'm one step closer to a running 240, but kinda sad - it's another roadblock (it not starting).
I think I might just send it to a mechanic and ask him to do all the work. I have a couple of bucks that don't have anywhere to go, so might as well save myself the headaches. We'll find out tomorrow.
As for this thread, the topic question has been addressed, and probably would be senseless to ask more questions in here.
You'll see me around the forums asking more questions like "why isnt car starting?", "where does this plug go?", "what kind of intake should I get?", and "why wont my girlfriend do that to me, too?"...
anyways, later. thanks for the help
Car doesn't start. It's cranking, but doesn't start. I'll troubleshoot tomorrow.
Lol, the first time I cranked it, I had my brother do it. Oil gushed out of the engine, and i'm like "Son-of-a-B****!", figuring I had a plethora of more problems. Nope. Forgot to install the oil filter.
I'm kinda happy i'm one step closer to a running 240, but kinda sad - it's another roadblock (it not starting).
I think I might just send it to a mechanic and ask him to do all the work. I have a couple of bucks that don't have anywhere to go, so might as well save myself the headaches. We'll find out tomorrow.
As for this thread, the topic question has been addressed, and probably would be senseless to ask more questions in here.
You'll see me around the forums asking more questions like "why isnt car starting?", "where does this plug go?", "what kind of intake should I get?", and "why wont my girlfriend do that to me, too?"...
anyways, later. thanks for the help