I just replaced the front motor mount on our F22b1 w/auto , and it looks like the rear motor mount will need to be replaced as well. I bought the front motor mount for under $40 for the Honda OEM part ... but the rear OEM is over $230. This is the vacuum assist mount with dual damping rates.

Comparitively, aftermarket rear mounts range in price from $30 to $100. Some have the working vacuum assist, and some have it dummied out or removed altogether.

I've heard horror stories about incorrect damping rates on the aftermarket mounts causing excessive vibration, but the price difference is so great I can't just anti up the cost without exhausting all other possibilities.

Has anyone out there replaced the rear vacuum assist motor mount with an aftermarket brand with good results?

Thanks. John

 

I replaced mine w/ a used OEM unit while chasing a vibration under acceleration problem that eventually was fixed w/ new CV axle. It cost only $20-$30 (don't remember exact price). They are readily available on ebay and car-part.com.

Be sure you need a new motor mount by observing mount from pax side w/ air intake removed. Get someone to hold foot brake and e-brake set while shifting from F-N-R at 1500 rpm. If you see excess movent (perhaps 1") or damage to mount, then replacement is indicated. If mount only stretches, then OK.

The amount of effect of the enhanced softness at idle is difficult to understand. Apparently for some cars it has a pronounced effect and others no affect at all. Later was case w/ my 94EX. No change from vacuum applied or removed.

good luck

 

So I just had a change to check it out with the air intake removed.

I chocked up all four wheels, eBrake on, and put it in reverse, and revved it a bit. The rubber is stretching and has lots of micro-tears in it (probably not going to last too much longer), but it would only stretch about 1/4" and was holding on.

But the vibration was still bad.

So I tried unplugigng and plugging in the solenoid. I could hear the "whoosh" of the vacuum diaphram moving, so my next step was to watch the solenoid, while I got my wife to work the solenoid.

Mystery solved -- the vacuum diaphram is working, but the metal linkage is broken! It snapped at the turn. Diaphram moves in and out no problem.

I'm guessing there is no way to fix the linkage, and the rubber is showing it's age with the microtears, so time to get a new mount.

How long have you had the used one that you bought? Did you notice any wear at all in the rubber when you bought it? I'm a little concerned that a used mount will have rubber as old as the one I'm taking off my car (and I have a California car ... these mounts will come from who knows where with more severe weather conditions) ... would you still advise I save the $$ and start with a used OEM mount?

Also, do you know of any way to verify the used mount is Honda OEM and not an aftermarket one?

Thanks. John

 

Surface cracks will happen in older components. It is not harmful to performance IMHO.

No, I don't know anyway to be absolutely certain. I looked at a removed OEM mount I have and it shows nothing that would ID such as Honda part no. It has paint marks from salvage yard where I purchased.

good luck

 

My next thought is to see if I can replace just the vacuum diaphram and linkage rod subassembly. The diaphram looks like it's held in with a slide clip. I can't tell how the metal rod is held into the rotating linkage, or is it just pressed into a plastic grommet?

 

The vacuum actuator is removable and held in place w/ a U-clip that slides off. However, parts are not avaiable. Vacuum actuator arm links to valve handle w/ simple 90 degree bend through a plastic grommet.

PM me if you're interested in the spare mount I have. I checked and it actuates and no rubber tears.

good luck

 

Thanks, I may do that. But first I should verify that the rest of the mount is working.

Can you confirm from yours if the movement of that linkage should be easy or hard, and if their is a spring return in the linkage assembly inside the mount vs in the actuator?

Thanks. John