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Originally Posted by mctwin2kman
Those motor mounts were revised in the 90's I believe. Which was when they made them a little bit taller. Not much, but enough. You should always replace both when doing them. So that the engine will sit properly. You could end up with the engine slightly angled more than it should be and could cause premature failure of the tranny mount or that newly replaced motor mount. Just an FYI!
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I've been thinking about what you said and thank you for the tip. However, I've been analyzing the possibilities and have decided that there really isn't any risk of any under-hood damage here, at least not great enough for me to go through the trouble of installing the other mount. I'm surely no geometry expert, but it would seem to me that the effect of the 3/4 inch height difference is minimized by both the distance between the 2 mounts (about 1.5 to 2 feet) and also by the fact that the original mount was surely at least 1/2 inch taller in its original form (you can tell by looking at the collapsed portion). Therefore, even if the new mount is a redesign and is substantially taller than the original uncollapsed mount, we are still talking about only 1 or 2 degrees of engine angle. This is further minimized by the clockwise (from the front) rotation of the crankshaft, which exerts downwards force on the passenger side mount (compressing it somewhat) while at the same time "pulling" on the driver side mount (stretching it somewhat), effectively counter-rotating the engine a slight - but measurable - amount, and equalizing all the angles. I'm also looking at this from the perspective that the engine/trans assembly are ALWAYS in motion while the car is being driven, in other words there is a great deal of stretching, pushing, and pulling going on under the hood, especially when you take into account driving aggressively, stomping on the gas while passing, hitting potholes, braking hard, cornering, etc. With the flexible nature of the mounts and all the great forces moving that whole assembly, I am quite certain 1 or 2 degrees of engine angle deviation won't make any measurable difference or put any substantial additional wear on either of the other 2 mounts.
But thanks for the thought and suggestion!