Installing new cam position sensor housing (synchronizer) on a 1998 3.8L Mustang - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 3 Old 02-12-2007, 12:28 AM Thread Starter
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Installing new cam position sensor housing (synchronizer) on a 1998 3.8L Mustang

Long story short: the bearing/bushing in the cam position sensor housing ("cam synchronizer") in my GF's 98 V6 Mustang started squeaking loudly a few days ago. A new CMP assembly and oil pump intermediate shaft should be here tomorrow.

Does anyone know the EXACT procedure for timing the new sensor/housing in a '98 3.8L Mustang? All of the procedures I have seen (either online or in a 94-98 Mustang Chilton's manual) are similar: with the crank at a specific position, use an alignment tool to align the CMP "vane" to the housing, and then lock the housing down. OK, no problem. The trouble is that I have seen references to TWO different alignment tools for the '98 Mustang 3.8L, and at least THREE different crank positions! So which is the correct combination of tool/crank position for the '98 Mustang V6?

Obviously using the wrong alignment tool might affect the CMP sensor timing, and using the wrong crank position WILL affect the CMP timing. Although the car will probably still run with the CMP timing set incorrectly, I'd like to get it correct. (Note that none of this affects the ignition timing, since the CRANK position sensor has not been touched. Incorrect CMP timing should only affect the fuel (injector) timing relative to crank position...)

Getting to the point:
1) Which is the correct alignment tool for a '98 3.8L Mustang? (My guess is Ford T96T-12200-A or OTC 6469 or Global 303-562. My Chilton's calls for T89P-12200-A, which seems to be for the 94-95 models. I don't know if it will work correctly for the 96-98 Mustang V6.)
2) Where should the crank be positioned when doing this alignment? I have seen 10*ATDC, 26* ATDC and TDC (on the compression/power stroke), all specified for different Ford engines/models/years. So which is correct for the application above, and which alignment tool does this correspond to?

I did take pictures of the existing CMP vane and housing alignment with the crank at 10* ATDC, so at worst case I should be able to eyeball the timing within a few degrees. Still, if anyone knows what the correct procedure for this model/year is, I'd like to hear it.

Thanks in advance for any help on this.

Scott

(I posted a link to this thread in the "Six Shooter" forum)


'00 Mustang GT
'72 Camaro 383
'87 Porsche 928 S4
'93 F-150 4x4 5.0L

Last edited by Scott Williams; 02-12-2007 at 12:41 AM. Reason: Posted a link to this thread in the Six Shooter forum.
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post #2 of 3 Old 02-12-2007, 12:39 PM Thread Starter
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Well I got my answer. I had never realized that for $10 you can get a 72 hour online subscription to the shop manuals through Helm, Inc. (the same place that sells the printed shop manuals and the CD-ROMs). see www.helminc.com for more info. That was just the ticket for a case like this, where I had one very specific question that I needed a QUICK answer to, but I didn't want to spend $120 - $150 for a shop manual / CD-ROM that I probably won't ever use again.

Anyway, here's the scoop:

1) The correct cam alignment tool for the '98 3.8L is T96T-12200-A.
2) The crank should be positioned with #1 cyl at TDC of the compression stroke.

NOTE: The Chilton's procedure that I quoted above was wrong for 96 - 98 models! The procedure that they described appears to be for the 94-95 3.8L, which uses a different CMP sensor, a different alignment tool (T89P-12200-A), and a different crank position (10* ATDC) to perform the alignment. Yes, the Chilton's book that I have does cover 94-98 models, so they were apparently not aware of the change to the parts/procedure in the '96 model year when they published the book. Just something to be aware of when using Chilton's and Haynes manuals...

Scott


'00 Mustang GT
'72 Camaro 383
'87 Porsche 928 S4
'93 F-150 4x4 5.0L
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post #3 of 3 Old 03-15-2007, 10:29 PM
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Last edited by taylor0987; 06-03-2007 at 06:30 PM.
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