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Discussion Starter #1
Please let me know if it will work. The Acura part numbers are different for these years.
 

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Well if the part number has changed that's a bad sign. Who knows what's different about it, but they are obviously different.

If you go to Acura OEM Parts online, for a 2004 TSX it's:

Starter Motor Assembly (Sm-71) (Mitsuba) - Acura (31200-RAA-A53)

And it specifically says:

Replaces: 31200-RAA-505, 31200-RAA-A51, 31200-RAA-A52
Vehicle fitment: 2004 and 2005 Acura TSX Sedan

While for a 2006 Acura TSX it's:

Starter Motor Assembly (Sm-71005)(Mitsuba) - Acura (31200-RAA-A61)

Vehicle fitment: 2006-2008 Acura TSX Sedan

With no mention of "replaces: 31200-RAA-A53" or any of the other starter parts the 31200-RAA-A53 is compatible with.

So clearly no, the 2006-2008 starter is not a drop-in replacement (by spec, if not fitment) for the 2004-2005 starter.

Whether that means one wouldn't fit, or would fit but your car would catch fire or something, if you put it in your 2004 TSX, who knows. But why are you asking? Do you have a used 2006 TSX starter lying around you want to use? If you're buying a new starter because yours failed, don't get a used one and just get the right part (they cost the exact same).
 

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Discussion Starter #4
Thanks for the information and your thoughts.

I was able to find new OEM parts for both years and the 2006 is $150 less. I agree with you if they were only available at the same price.

After running through a few image searches, I was hoping that someone in the community might know the differences to be sure I wasn't missing a compatibility issue.
 

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Thanks for the information and your thoughts.

I was able to find new OEM parts for both years and the 2006 is $150 less. I agree with you if they were only available at the same price.

After running through a few image searches, I was hoping that someone in the community might know the differences to be sure I wasn't missing a compatibility issue.
Are you sure it's a new OEM part? Curious that you found a 2006 starter for $150 less, when one of the standard (?) online parts stores have them at the exact same price. If nothing else, having a 2007 TSX myself, I'd like to know where 2006-08 parts are so much cheaper :).

I guess you can call a dealership's service department to ask, but without some kind of diagram or spec sheet on the parts we really can't tell except to say that Honda has determined them to be different parts that are not equivalent.
 

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Discussion Starter #6
Yes, very curious :)

There's a Honda dealer on eBay that I've purchased from in the past that has it. All the previous parts were definitely OEM.

I'll see if I can get my hands on both at a local parts to compare. Thanks!
 

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So, I found this part and connecting part diagram at a different online Honda parts store...

The Mitsuba SM-71 (for the 2004-05 TSX):

And the Mitsuba SM-71005 (for the 2006-08 TSX):

They are very similar, but not exactly the same. For example, #13 and #8, the stay engine harness and the switch cover, are clearly different, and I don't know what that implies for either fitment or use. There are other differences as well.

Since the 06-08 TSX made changes in the size or angle of the crankshaft, connecting rods, intake valves/cams and throttle body from the previous model years, I wouldn't be surprised if the starter had to be slightly adjusted to match.

Long story short - they made the parts a different number for a reason... Honda (or any manufacturer) has great cost incentive to reuse parts that they already produce and have on hand in any given year, so take a part number change relatively seriously unless it's something like a rubber seal that will just squish flat over time anyway or something.
 

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Discussion Starter #8
So, I found this part...They are very similar, but not exactly the same. For example, #13 and #8, the stay engine harness and the switch cover, are clearly different, and I don't know what that implies for either fitment or use. There are other differences as well...
Thank you!

I looked at your links and you've convinced me they're too different. I'll avoid trying this swap.
 
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