Well I have a spare 2.0 beta I on an engine stand that Ive been working on for my turbo project. Well everything has been fine and dandy so far and Ive done the 1.8 cam swap and I have lightweight pullies on it so far. But today I had to take the crank pulley off to get the plastics off. No biggie. Well when I was putting everything back on I made sure that it was all in time and what not and started to tighten everything up. After that I rotated it slowly to make sure everything was still in time jus to be safe and then the intake valves started to hit the pistons. WTF???

Now I know that the crank gear has to rotate twice for the cam gear to rotate once. Ive taken both cams out and made sure they wear timed up right. I did this twice. As the cams were out I made sure to put the crank gear back into its rightful spot. But as soon as I put the cams back in it started to happen again. I have no clue what the problem is. This never did this before. For instance, the cylinder closest to the driver side, the intake valves will hit the piston when its all the way open. I mean the other cylinders are doing this too but why? I dont understand why this is happening. The engine has no oil in it but its not like Im constantly cranking it at high speeds. When I do its really slow not to effer anything up. So can someone point me in the right direction? This is really pissing me off. Sorry. Thanks tho.

 

Sounds like you may have the timing on the crank off 180 degrees. A nice easy way to check this is to get a long screwdriver that can fit down into the cylinder. Mark the high and low points on top of the valve cover, if memory serves me correctly the piston in cylinder one (passenger side) should be at TDC. I would recommend rotating the crank one full rotation around, reinstall the timing belt and try again.

 

Ive tried the screwdriver trick actually. And yes I believe it to be cylinder 4(drivers side) when the intake valves are open it seems the piston is at TDC. I mean Ive rotated the crank gear like 3 times with the belt off but maybe everytime I reajust it I am putting it right back in the same situation. If soo I can live with that and Ill jus readjust it tomorrow when I get the chance. But Im starting to think when I was tightening down the crank pulley it must have slipped time or something the first place. Because right after that is when it started to do that. Anything else I should look for? Thanks yamaha.

 

There's really no guesswork involved. Line it up right, and it *is* right. Are you sure the pistons are meeting the valves, vs. the static compression being very high on a fresh motor? Pull the spark plugs and if it spins easy all the way around, you're good.

 

didn't someone say they had a problem with their obx cam gear recently? just something to check into

 

Sounds to me that your cam timing is off. It soumds like the cam timing is too advanced the valves are trying to open before the piston is coming down. check there if you know the piston is at tdc. Id also go to hyundai web tech and verify your markings that everything is aligned.

 

follow what stocker said and pull the spark plugs. that way you WILL KNOW if your hitting anything because the engine will turn over VERY easy.

IT is also possible that you could be 180 off. The crankshaft spins twice for every time the camshaft gear spins once.

 

Don't be distracted by 180 degrees. The computer knows about it too. It doesn't matter if you are on a compression or an exhaust stroke, the piston and valve events are the same. Line up the timing marks.

The cam gear was also a good idea; do you have one?

The crank pulley can't be out of position AND properly tightened snug up close to the block, unless your crank is way different to mine.

 

This issue never occured until I swapped the 1.8 cam in. I know how to do the swap cuz Ive done it before. With the cam markings 5 links apart, the #1 and #4 cylinder will encounter the piston hitting the intake valves. And yes they are hitting, and yes the spark plugs are out. So I got curious and tried advancing the intake cam 1 chain link and then cylinders #2 and #3 started to do it. I have no clue what the problem is. Ive lined everything up like a gazillion times and its still doing it. The crank gear is lined up with the notch on the block and the cam gear is lined up with the notch on the exhaust cam journal thru the pinhole on the cam gear. What else could I be doing wrong here? This makes no sense. Btw, Im using the stock cam gear.

No matter how many times you turn the crank gear back to the notch on the block, the pistons will be in the same place. So that shouldnt be and issue. I jus dont see what could be going wrong here. So frustrating. But I have noticed that when the intake valves hit the piston is when they are fully open. Help!! Im going to cry. haha.

 

Are they Beta 1 valves? I seem to recall Beta 2 valves are longer by a hair. Does it do it with the 2.0L cam also? Do they hit, even with NO intake cam installed?

Was the head shaved? Is a thinner than stock head gasket being used? Are you using 1.8L or other pistons?

Can you get access to a borescope, or can you look down the spark plug hole . . . are you sure there isn't some little piece of something in there on top of the pistons? Carbon/gasket material/broken whatever? You didn't drop a washer down in there or something, did you? wink1.gif Are you certain the valves are being held properly by their retainers?

Come to think of it: what EXACTLY has been done to this engine we're talking about? I mean from now all the way back to when it was made in Korea, what do you *know* has happened to it/where did you get it, etc.