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SoNic

How To Adjust Timing On A Messed Up Engine?

15 posts in this topic

This is my wife's Hyundai Sonata V6 2.5L. Seems like every 35-40k miles the timing belt breaks. Fortunately, even if they say it is an interference engine, never did damaged the pistons/valves. Always happened in the driveway (like today).

So, when I crank the engine it spins really fast. Now, all the timming is messed up. How do I align again the marks in this case.

Firing order is 1, 4, 2, 5, 3, 6. Cylinder numbering is 1, 3, 5 by firewall, 2, 4, 6 by radiator.

My plan:

1. Rotate the crankshaft until cylinder #1 is at top.

2. Rotate the camshaft gear on the cyl #1 bank until I get both (actually all 4) valves closed. This should be in the location when the marks on gear line-up. Do I need to take the valve covers off to do that or I can feel it with the finger in the plug hole?

3. Rotate the other bank gear till... now I am lost. What cylinder should be at top compression now?

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I have never done timing, but from what i understand, there are timing marks on all 4 cams, and the crank, having the crank at TDC as well as the cams will give you perfect timing.

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Your best bet is to find what Hyundai's procedure is. Each car is a little different. Most have timing marks, or in the case of a 95-97 zetec contour you must pull the cam cover and put in a special camshaft holding device to align them.

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Your best bet is to find what Hyundai's procedure is. Each car is a little different. Most have timing marks, or in the case of a 95-97 zetec contour you must pull the cam cover and put in a special camshaft holding device to align them.

Lol, my "special" timing tool was a small sheet of wood I trimmed to fit the camshafts :lol:

Give me the year of her Sonata, and I can see if my version of Mitchell has the car, and if so, I'll get you the information you need ;)

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0996b43f8020904f.gif

Should be something like this. Need year to get the specific diagram, and the VIN code for the engine would help as well (eighth letter).

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Is it bad I know the mechanical timing procedure by heart on the 2.3 turbo Ford motors? I also know which motors computers get 10 and 13 degrees. I also know the voltage the TPS is supposed to sweep at after you set all of that.

On a serious note. That's a Delta engine like the Tiburon had. 2.5 vs 2.7 but the procedure may be the same. Maybe check out a tiburon forum.

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It is 2000 V6 2.5L. All the procedures of replacing a GOOD belt rely on timing markings when cyl 1 is at TOD. In my case, the belt is not good anymore so I have to know if the markings can still be used since two crank rotations can fit to that position.

Edited by SoNic

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Just align all the marks and you will be in business. The crank rotates twice for each rotation of the cam(s), so there will be 2 points where it will line up.

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Soo... how would I know at which one of the two possible rotations I am? Because only one of the rotations is the "right" one (compression on cyl #1).

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If I'm thinking right as long as cyl 1 is at tdc it doesn't matter. It will only matter if the timing belt were attached. Two rotations of the crank for one rotation of the crankshaft, so as long as the marks are lined up you can put the belt on.

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Exactly, so long as the mark is lined up and cylinder 1 is at tdc it doesn't matter what stroke it is on.

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Exactly, so long as the mark is lined up and cylinder 1 is at tdc it doesn't matter what stroke it is on.

Good call.

With the timing belt off, every stroke is the same on the crank.

And the cam.

Once they are belted, then they have the pattern.

-chart-

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Good call.

With the timing belt off, every stroke is the same on the crank.

And the cam.

Once they are belted, then they have the pattern.

-chart-

As soon as you line up all the marks, the engine will be on compression for #1 cylinder.

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Thanks, I was confused. That's easier than I was thinking.

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Now... I can see the belt. Not broken or "jumped" teeth.

So my guess was wrong - based on previous experience. When I did crank the engine, it spinned faster than usually (like some valves would be open) but didn't start.

Edited by SoNic

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