UDP damage...
#42
If people could check theirs just to make sure, then that would be great. ![Nod](https://maxima.org/forums/images/smilies/nod.gif)
coolmax05-that's what I also thought too, since the BIG notch in the middle would place it there...and I didn't know that one had to make it TDC to install the pulley...
![Nod](https://maxima.org/forums/images/smilies/nod.gif)
coolmax05-that's what I also thought too, since the BIG notch in the middle would place it there...and I didn't know that one had to make it TDC to install the pulley...
![Scratch](https://maxima.org/forums/images/smilies/scratchhead.gif)
#43
It's not for the pulley/belt itself, per se...it's for the replacement of the timing chain I believe (at a later point).
The timing on our cars is controlled by the computer using crank sensors. But the crank has to positioned correctly in reference to the cam. To accomplish this, both the cam and (in this case) the UDP must be in a certain position to each other. You do this using the marks on the UDP and the cam.
The cam opens and closes the valves at particular time relationship to the pistons.
Ultimately the timing chain determines the relationship between the pistons and valves in the engine. That's why you want it replaced before taking any chances on it slipping or breaking.
The UDP itself has no bearing on the relationship between the cam and the crankshaft.
Your question was answered by post #6 a while ago. He just didn't elaborate. That's why the thread was deemed dead on arrival. Why the others didn't see marks on their UDP's is a mystery. Consider yourself lucky!
The timing on our cars is controlled by the computer using crank sensors. But the crank has to positioned correctly in reference to the cam. To accomplish this, both the cam and (in this case) the UDP must be in a certain position to each other. You do this using the marks on the UDP and the cam.
The cam opens and closes the valves at particular time relationship to the pistons.
Ultimately the timing chain determines the relationship between the pistons and valves in the engine. That's why you want it replaced before taking any chances on it slipping or breaking.
The UDP itself has no bearing on the relationship between the cam and the crankshaft.
Your question was answered by post #6 a while ago. He just didn't elaborate. That's why the thread was deemed dead on arrival. Why the others didn't see marks on their UDP's is a mystery. Consider yourself lucky!
Last edited by coolmax05; 01-21-2008 at 09:20 PM.
#45
And to think i almost bought that UDP too lol. Thats some pretty half assed work on the "timing marks"
#46
Just did a quick search and HIBE took some pictures of his before he put it on. In his first picture you can see the marks.
http://forums.maxima.org/showthread....ighlight=cosmo
http://forums.maxima.org/showthread....ighlight=cosmo
#47
That's exactly what I told them too! Looks like they just took a dremel and zapped a few lines in it without cleaning them up!
hmmm, I guess I'm just going to try and clean the lines up a little bit, and call it a day.
Just did a quick search and HIBE took some pictures of his before he put it on. In his first picture you can see the marks.
http://forums.maxima.org/showthread....ighlight=cosmo
http://forums.maxima.org/showthread....ighlight=cosmo
#51
i knew they were from canada... that is what made me think of your ruler..
we had the conversations about UDPs...
![Smilie](https://maxima.org/forums/images/smilies/smile.gif)
i just snagged a udp from ebay..
greg proved that a 4th gen pulley would fit his 3.5l
www.greghome.com
#55
#56
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Here a pic of an UR UDP, I wonder if the little tabs that stick out off the edger are the timing marks?
![Confused](https://maxima.org/forums/images/smilies/confused.gif)
![](http://i161.photobucket.com/albums/t208/Apollos2/b7e625f7.jpg)
Installed pic but nothing clear in this one
![](http://i161.photobucket.com/albums/t208/Apollos2/de19f268.jpg)
#63
![wtf](https://maxima.org/forums/images/smilies/wtf.gif)
#64
Lol, CPS works off reluctance. Needs steel not aluminum. Those sensors are behind timing covers or some nature of protection 99% of the time. They are just timing alignment marks.
#66
I might be a little late , but you do get what you pay for , Unorthodx have markings on their pulleys like AEM .. Cosmo or Top Speed , Arospeed Pulleys dont have acutally engraving markings.. Dan those arent damage markings.. those are for the timming.
your perfectly fine ..
your perfectly fine ..
#74
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Andrew91SE
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11-26-2000 03:05 AM