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Timing Marks (Pics)

 
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  #1 (permalink)  
Old 21 Mar 2010, 07:05 pm
DigitaL101's Avatar
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Default Timing Marks (Pics)

Had a water pump leak after an overheating issue , Figured now is the time for belt and updated tensioner kit . While taking pictures of the timing marks for reference, i noticed what i consider slight inconsistencies in my marks , and the marks found on most diagrams .

Allow me to illustrate ...



When the crank tdc is aligned to the "trailing edge" mark ......





The cam marks look like this ....






Now when the Cam marks align as per the diagrams (exhaust cam half notch lower) ........







Then the crank tdc mark looks like this ...
(poor picture , couldent get an uper angle on the gear teeth , added visuals )

The tdc is now well of the mark , a tooth gap away




Now ive read some of the horror stories about having to repeat this job , so if im missing somthing here please ..
let me know , ide like to get this right the first time .

Thanks in advance guys .
Dave

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Old 21 Mar 2010, 10:01 pm
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Default Re: Timing Marks (Pics)

I believe:

What you're trying to do is line up TDC in cylinder 1, not simply lining up the crank marks and cam marks. Continue rotating the crackshaft in the proper direction. When #1 is at TDC (and not some other cylinder), then all the marks will line up.

Someone correct me if I'm wrong.
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Old 21 Mar 2010, 10:57 pm
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Default Re: Timing Marks (Pics)

Hmm... Well, crankshaft mark and "up" indications on the cams will be TDC on #1. When I did the 06 and then the 02, I did find different stamping marks on the crank marks (slightly different, but would make it a bad day for you to be off 1 tooth). As you can see on your picture, you are slightly left on lining up. I had to put my head into the front of the wheel well to observe the line up. Believe me, it will change if you move your head left. I installed the dampner bolt to use it as a line up with my eye. If you do this, you will see the cam marks line up.
BTW, If the timing belt is intact, I learned a technique from a Chrysler tech that works. Line up the marks and use a spot of paint on the belt and cam tooth. Make a mark on the crank tooth and belt. Mark your new belt (mirror your old belt. I even counted teeth to make sure they were the same). Reinstall the new belt using the paint marks. This technique will always work and you will never be off! If you look close on the pictures, you will see the marks I made when I did a valve job on the 02
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Old 21 Mar 2010, 11:36 pm
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Default Re: Timing Marks (Pics)

Great info guys , unfortunately , the belt has been removed , that would have been the perfect technique skyking ..

let me ask this ... when the tdc mark is ligned , i am either on compression stroke or exhaust stroke ... correct ?

and if i am on exhaust stroke , wouldn't the cam gears be upside down ?

as i am clearly not versed in crank stroke theory or cam sensors ...
someone could realy put a stamp on this thing for us guys with shadetree degrees


2002 Limited 5 Speed
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Old 21 Mar 2010, 11:52 pm
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Default Re: Timing Marks (Pics)

Yes. you are correct... The "UP" will be upside down on both cams but for some reason, Chrysler put line up marks on both sides of the cams. For every rotation of the crankshaft, the cams move 1/2

Btw! Do you sell shirts with that cruiser on it... Looks great!

Last edited by 767skyking; 22 Mar 2010 at 12:00 am. Reason: Shirt question
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Old 21 Mar 2010, 11:54 pm
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Default Re: Timing Marks (Pics)

My understanding once tension is put back on the belt, all will line up. Have you released the tensioner yet to check?
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Old 22 Mar 2010, 12:41 am
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Default Re: Timing Marks (Pics)

Well ... there is tension on the belt in those pics , those pics are from a running stock belt ..
i just dont see them lining up like the diagrams .

i could just reinstall exactly as the pictures ..
but that doesnt explain the difference in what im seeing and what the diagrams show that i should be seeing , im just curious like that .


skyking , lol .. no not my graphic , thats a google special . I'll post a pic of my PT when it looks that good


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Old 25 Mar 2010, 08:19 am
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Default Re: Timing Marks (Pics)

I would like to know why the timing marks on yours isn't the same as in the manual also??? I am getting ready to put a timing belt on my 2003 PT cruiser and this is confusing me somewhat.It looks like your marks are at a totally different position than where the manual says they should be,but you said the car is running fine at this position didn't you?
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Old 25 Mar 2010, 08:48 am
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Default Re: Timing Marks (Pics)

Yes , the marks in those pictures illustrate a running alignment .

The PT ran very smooth , no missing , no issue .



Here is another illustration showing (in RED) where the tdc mark is when the cams are aligned as per the manual



clearly not "leading edge" .


As i have still not replaced the belt yet , i cannot elaborate further .
I have some headwork being done ... so , when i replace the belt and fire her up , i will do a followup




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Old 25 Mar 2010, 07:36 pm
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Default Re: Timing Marks (Pics)

I've done hundreds of them. Well that maybe a slight exaggeration... This is how I do them. Set all the marks where they are supposed to be. Put the belt on at the crank. Run the belt up to the intake. Rotate the cam slightly clockwise about a half a tooth. Catch the belt and then turn in back to take up the slack from crank to cam. Clamp it down lightly. Run the belt to the exhaust cam and your gonna do the same thing as the intake. Then run it down to the crank and set the tension. Having said all that I still miss it every once in awhile. Good luck! And when it's all done the marks aren't going to line up perfectly.
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