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Microtech CAS pegged all the way counterclockwise??

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Microtech CAS pegged all the way counterclockwise??

Old 06-13-08, 11:39 AM
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CAS pegged all the way counterclockwise??

Hey i just got my motor rebuilt and am trying to set the timing correctly.

1. turned the pulley until it was marked with the yellow marker.
2. pulled the cas out and lined up the gear dot with the housing line.
3. marked the top of the cas so i know how to line it up when i stab it.
4. put the timing light on the front leading spark plug.
5. turn on timing lock and check the pulley.

With the cas positioned in the middle of the stud you cannot even see the red and yellow markers on the pulley. It is far to the left, the only way for me to line up the yellow marker is to turn the cas counterclockwise until it is pegged all the way. Is this right??

It just seems wrong to have the peg pegged all the way. It seems to drive and idle fine so i just want to make sure.
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Old 06-13-08, 03:05 PM
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what are u talking about? i cant understand why u cant see the pulley marks when putting in the cas.

u line up the the pulley mark take the cap off the cas line up the dot on the cas hold the inside of the cas so it dosent turn and insert it
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Old 06-13-08, 03:52 PM
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At what RPM are you trying to set timing? Did you jump the initial set coupler? Are you SURE you aren't one tooth off while stabbing?
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Old 06-14-08, 02:39 AM
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i'm using microtech 1t10s.
I line up the yellow mark with the front cover and pull out the cas and set the gear with the housing.

I start the car with timing lock on and the only way to line it up with the yellow mark is to peg it all the way counterclockwise. With is this way i messed with the idle map and it idles around 750. If i have it around the middle, its kind of high between 750 and 1000.

Someone please help me out.
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Old 06-14-08, 10:57 AM
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Mentioning the Microtech would have been good in your first post.

Are you running any ignition boxes?

Also, moving to Microtech forum.
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Old 06-14-08, 11:51 AM
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nope just running lt10s with stock coils
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Old 06-14-08, 12:18 PM
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Originally Posted by blimp View Post
nope just running lt10s with stock coils
Once you've tried all possible things, you might consider this: IF the DRIVE GEAR for the CAS is installed with its champfer facing fwd instead of towards the front side housing, then this problem WILL happen.

The fix is to remove the front cover and reinstall the CAS drive gear. Others elongate the groove in the CAS so it'll rotate more. Been there, done that.

FIRST you have to make sure your not making a mistake. How? Got me. Repeatedly doing the same thing should prove what I said above, IF it's being done right in the first place. Only you know that.
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Old 06-14-08, 02:28 PM
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I'm not familiar with this TIMING LOCK dealeo. I use a basic, cheap, plain ole timing light that sells for twenty bucks. I'm not sure what LOCK does. Can you UNLOCK this thing where it just flashes.

I'm also not familiar with that aftermarket computer. If your using the stock ECU for timing, then maybe this does not belong on this Mickeytech forum. humor
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Old 06-14-08, 03:48 PM
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it happens to me ones and i was one dam tooth off and the car only started with
CAS pegged all the way counterclockwise,another thing are you using the right matching front hub and housings(if you have s5 housings you need a s5 hub,or if you have s4 housings you need s4 hubs)the pulleys are different between series and there is a difference in the timing marks(like a quarter inch difference)
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Old 06-14-08, 05:18 PM
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IF it's the same engine parts, then it's not the hubs/pulley etc.

IF the CAS DRIVE gear, located on the eccentric shaft, is installed backwards, then your timing will be what you describe.

There are several threads on the 2nd gen forum dealing with that. One fellow went to the trouble of removing the front cover and reinstalling the drive gear. All was well after that.

I don't think this is a Microtech problem. It's a second gen problem.

The thread owner done gone away.
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Old 06-14-08, 05:39 PM
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Read this thread: https://www.rx7club.com/2nd-generation-specific-1986-1992-17/need-help-setting-ignition-timing-703971/

You can skip most of it and drop down the post by AGreen.

These are his words that count:
************************************************** ******************************

I had a similar problem after rebuilding. I installed the CAS drive gear backwards. Maxed out, I was getting about 3mm away from the points lining up, so I moved the cas one tooth. Now, maxed out the opposite direction, I was still 3 mm away. Removed the front cover to find the drive gear flipped. Reassembled and checked timing. Bingo- dead on!
************************************************** *********************************
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Old 06-14-08, 08:29 PM
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so i guess its fine. I have the cas pegged all the way and it lines up with the yellow mark. Car runs fine and all. So i was just wondering if it was abnormal, i guess not.
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Old 06-15-08, 01:33 AM
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Originally Posted by blimp View Post
so i guess its fine. I have the cas pegged all the way and it lines up with the yellow mark. Car runs fine and all. So i was just wondering if it was abnormal, i guess not.
Well, it is abnormal in that it's likely the gear on the eccentric shaft that engages the lower gear on the CAS, is on backwards. That in turn results in the CAS not being able to be rotataed enough to get the timing marks to align when using the timing light.

The fellow AGreen had this problem plus .......OOOOPS.......I had this problem on my 86 non turbo that I rebuilt. It drove me nuts. I rebuilt it and used the same parts as before it was rebuilt. I assssssumed it was the gear that drove the CAS and refused to pull the front cover to turn that gear around. So I elongated the slot in the CAS so it would rotate enough to get the timing right on with a light.

That car runs just fine and that's been, I'm guessing, about five or so yrs ago. Since then I've found TDC using my method of displacing oil in the rotor chamber, and I find that the marks on the pulley are right. So it was not a pulley problem/marks on pulley problem.

When I read AGreens comments on that thread, where he went to the trouble of pulling the front cover and swapping the gear around and that correcting the *problem*, it gave me warm fuzzys.

Just saying if you get a rat tail file and lengthen that CAS groove, you can get the timing right on. There will be NO problems if you do this. It beats pulling the front cover and swapping the gear around.
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Old 06-15-08, 01:37 AM
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Here's another example of that problem in another thread: https://www.rx7club.com/showthread.p...CAS+DRIVE+GEAR

I've no idea just how that one turned out or exactly what he did after the last post in that thread.

ClicK this url for exactly what gear we're talking about: https://www.rx7club.com/attachment.p...3&d=1204768153

There's only two ways I know of to PROVE this is the problem. One is to pull the front cover and turn the gear around. The second is to buy a RacingBeat front hub/pulley and installing it, and STILL having the same problem as you do now.

The RacingBeat pulley and hub are all one part unlike the stock pulley/hub and they have the timing marks on it relative to the the slot in the eccentric shaft. the slot that is ninty degrees from TDC. I didn't make that clear. The bottom line is their pulley/hub is perfect.

You might send that guy PINK a PM, and ask him what he did to solve the problem.

I'm also wondering how many of this type problem is blamed on using the wrong front pulley/hub on the engine. No way to tell.
Attached Thumbnails CAS pegged all the way counterclockwise??-casgear.jpg  

Last edited by HAILERS; 06-15-08 at 01:49 AM.
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Old 06-15-08, 05:42 AM
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Mate. Its not abnormal. I have tuned many many 13b turbos factory mazda built engines and the CAS must be pegged counter clockwise for timing to line up correctly.
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Old 06-15-08, 12:33 PM
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Originally Posted by rx72c View Post
Mate. Its not abnormal. I have tuned many many 13b turbos factory mazda built engines and the CAS must be pegged counter clockwise for timing to line up correctly.
Just ain't so good buddy. I've rebuilt many engines and only had one that you had to rotate the CAS all the way one way or the other. And I KNOW why that one engine had that problem.

A good third party, neutral opinon is the one I cited by AGreen. Sorry 'bout that, but I'm stubborn.
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Old 06-15-08, 07:09 PM
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Mate do it how you please.

If you have put the CAS drive gear the wrong way around the timing mark wont even line up at all. like you said. you will get close but not be able to do it.

if its on the right way. you will retard the cas all the way and depending on some variations in pulleys it will be pegged all the way or not very far from it. ive seen up to 5-6 degree variations in FACTORY markings on pulleys.

At the end of the day, an experienced tuner would be able to make adjustments on the ecu to rectify any timing issues.
many times i have tuned cars and loaded timing maps that i use that i know have worked on other cars that dont work with some. and on those particular cars i have found that pulleys were not marked 100%
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