Cam shaft out of alignment - New Tiburon Forum : Hyundai Tiburon Forums
 
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post #1 of 8 Old 06-07-2019, 08:44 PM Thread Starter
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Cam shaft out of alignment

Hey Guys,

I replaced my timing belt and water pump. Put everything back together and working fine. Drove on the freeway and engine started overheating. Turn out I did something wrong with the water pump and was leaking. So, I took off the timing belt cover and double checked timing, which was good and then started the car briefly to check for the leak. I determined it was the water pump and got a new gasket and replaced the old one. I then put the belt back on and realized I forgot to realign the timing marks. So, like an idiot I tried to quickly get everything back on in a hurry. I dont know about you guys but I cant get the belt on without taking off 1 off the tensioners/pulleys first. So I left the tensioner off and began turning crankshaft to make sure alignment was good. All the sudden I gear a noise. The tension wasn't enough and it slipped. So, I put the tensioner back on and start cranking by hand, which seemed harder than usual. Low and behold the right cam is 1 tooth ahead and the left cam is 10 teeth behind! (No idea how it got that bad) Did I just totally ruin my engine? Or simply take off the belt and individually move cams into position and everything is right in the world? Keep in mind the engine was off during this period and just turned the crankshaft manually.
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post #2 of 8 Old 06-07-2019, 10:43 PM
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Re: Cam shaft out of alignment

I would remove the belt, relax tension on cams, set the crank and start over.
Cross fingers, toes, eyes, etc., that it's all OK.

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post #3 of 8 Old 06-07-2019, 11:15 PM Thread Starter
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Re: Cam shaft out of alignment

How exactly do I start over? The crank is at TDC and belt is off. Do I simply move the cam to the positions they need to be in? I saw a video where they unbolted the cam and moved into position then bolted back down. Is that the case? Or can I just start moving the cam with the belt off with no other steps? Obviously would like to avoid unbolting the cam since that will require a ton of time tearing apart air intake etc.
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post #4 of 8 Old 06-08-2019, 07:48 AM
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If its that far off then you will need to remove and reinstall the cams on that head to avoid damaging the valves.

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post #5 of 8 Old 06-09-2019, 09:45 PM Thread Starter
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Crap. I didnt get a response so i turned by hand with cam bolted on. Now, lets say by a miracle of God everything is ok. Im making an assumption both cams are off. How do i line them up? Does it matter what stroke the crank is on? Or simply just make sure crank is at TDC mark and cams on their mark and everything is good? I know crank needs 2 revolutions to make 1 cam revolution. Any help would be appreciated
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post #6 of 8 Old 08-06-2019, 10:39 AM Thread Starter
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Re: Cam shaft out of alignment

Ok, so it took forever but finally have everything back together. I stripped the tensioner bolt threads. I almost crapped myself when it wouldn't tighten. Did some searching and decided to use heli coil. It was either that or junk the engine. After carefully drilling out old threads and creating a new thread the screw locked in. After some trial and error with the timing belt (never lines up after doing 2 rotations) I got it setup. Prayed to God that I didnt warp the valves and turned on the car and everything is working fine. So if there is warping it is minimal. Thanks for all your help
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post #7 of 8 Old 08-07-2019, 01:00 PM
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Re: Cam shaft out of alignment

Count yourself lucky...God had nothing to do with it..

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post #8 of 8 Old 08-08-2019, 08:50 PM
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Re: Cam shaft out of alignment

Quote:
Originally Posted by sc1984 View Post
Ok, so it took forever but finally have everything back together. I stripped the tensioner bolt threads. I almost crapped myself when it wouldn't tighten. Did some searching and decided to use heli coil. It was either that or junk the engine. After carefully drilling out old threads and creating a new thread the screw locked in. After some trial and error with the timing belt (never lines up after doing 2 rotations) I got it setup. Prayed to God that I didnt warp the valves and turned on the car and everything is working fine. So if there is warping it is minimal. Thanks for all your help
Whew, lucky you!

What you experienced happens all the time. On one of the cams, there is a lot of valve spring tension against the camshaft because it is holding the valves open.
The camshaft just rotated in order to release the tension. I always think of it as a balancing act. By lining up the camshafts manually, you are getting it to balance the spring pressures at the top of the cam lobe from the open sets of valves.
A little bit to close to either side or a bump to the camshaft wheel will cause it to fall off its balance!
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