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cam sprockets not lined up

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juntjoo

10+ Year Contributor
780
1
Sep 12, 2011
fort myers, Florida
I'm replacing my timing belt and doing a BSE for the first time and I noticed a couple alarming things:

1) the cam sprockets are off a tooth when lined up in the middle with exhaust at 3 o'clock and intake at 9 o'clock. Check the pic for reference.

Does this mean the belt was put on wrong or the belt got stretched over or something? what kind of ramifications would this cause the cam shafts' functionality? Could the problem be that the sprockets are just misaligned to the cam shafts and that they could still be in synch with each other and the crankshaft/pistions?

2) Cranking the crank shaft over well over six times I was never able to get all the cam, crank, and oil pump sprockets to line up with their respective timing marks. The crank and cam shafts would line up every four rotations of the crank shaft, while the oil pump sprocket would line up with the crank shaft every six rotations, but always one rotation away from the cam shaft marks lining up. I'm sure I've located the timing marks correctly, but just in case I'll include pictures

I wouldn't know how to tell when the 1st piston, which I assume would be the closest one to me, would be at TDC, so I'll point out that the pointy end of the exhaust cams are pointed straight up (2nd-to the right, 3rd-to the left, and 4th-straight down). Not that the cams would necessarily indicate the position of the pistons, but I'll assume they are close enough in synch since the car ran decent enough before the timing belt broke, luckily only partially giving me warning to stop the car. But aside from some stuttering of the engine during idle it ran alright. Idled kinda high for about ten minutes too long after starting the car and seemed to have only about 15 mile per gallon fuel economy. I hope some if not all of these issues have to do with these timing mark problems to I can fix em.

Well since I'm doing a BSE I guess I don't need to worry about lining up the oil pump sprocket right? And I what do I do about the cam timing marks misaligned? How do I check the timing between both cams regardless of where the timing marks are? I could really use some experienced help on this one. Thanks
 

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Wait a minute.

Let me get this straight.
-You had the timing belt break.
-Replaced it and did a BSE while you were doing it.
-Now you notice the marks won't all line up.
-Car gets 15mpg and idles rough.

Have you checked your compression recently? Sure you didn't bend any valves?

But if all those photos were taken without moving the belt, it looks like you turned it a little past top dead center. It looks like the crank, oil pump, and intake gears would all line up if the exhaust was off 1 tooth counter-clockwise. It's a common mistake when doing the timing belt.
 
To find tdc pull the number one plug (yes it's the one closest to you while you are looking at the timing marks on the cam gears) and stick something long and thin in the cylinder so it touches the piston and you can see it while hand cranking the motor. When it goes all the way up and then stops before it goes back down it's at tdc.
 
Wait a minute.

Let me get this straight.
-You had the timing belt break.
-Replaced it and did a BSE while you were doing it.
-Now you notice the marks won't all line up.
-Car gets 15mpg and idles rough.

Have you checked your compression recently? Sure you didn't bend any valves?

But if all those photos were taken without moving the belt, it looks like you turned it a little past top dead center. It looks like the crank, oil pump, and intake gears would all line up if the exhaust was off 1 tooth counter-clockwise. It's a common mistake when doing the timing belt.

No, I just started. Just took off timing belt cover and noticed these things. And the belt only partially snapped leaving most of it to allow me to drive home.

Sent from my Eris using Tapatalk
 
To find tdc pull the number one plug (yes it's the one closest to you while you are looking at the timing marks on the cam gears) and stick something long and thin in the cylinder so it touches the piston and you can see it while hand cranking the motor. When it goes all the way up and then stops before it goes back down it's at tdc.

Cool, thanks.

Sent from my Eris using Tapatalk
 
Turn the crank by hand back to tdc, then see if the cams line up if not re do the timing. Dont forget to have the crank half a tooth before tdc when you do the timing. If not the timing will be off and advanced.

Why is that?

Sent from my Eris using Tapatalk
 
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