MEP 802A vibration isolator

[grywitt]

Hello .
So one of the 802s I got needs mounts. I did buy one off ebay. It's not the exact same part number. It's -2. I purchased it by gen not part numbers. I'm learning. Anyway the front and rear isolators on the left are cracked bad. I can't seem to find and front ones anywhere. I'm attaching some pics. The button half of the isolator is still in really good shape on the front one. You suppose I can turn it over and use it that way? I know it's not perfect but it would probably be better hu? Also if anyone knows how i can but them i would be grateful. I wish I could spend some time with done of you guys and learn some things. ( I actually can't find the motor one either )

The part numbers are 88-21070-3 and
88-20027-1

Funny thing. I see now while writing this that the part installed on the gen doesn't match the TM either. I guess the new one is closer. Ha ha. Only one number away.

 

[2Pbfeet]

I can't help with the OEM isolators, but I use McMaster-Carr for vibration isolators all the time. There are in my experience two ways to match new isolators (non-OEM); one is to weigh each point, and purchase matching isolators. The other is guesstimating the weight, and swapping in stiffer or softer isolators later. In my experience guesstimating often wins out because of dynamic nature of different loads.

All the best, 2PbFeet

 

[grywitt]

I can't help with the OEM isolators, but I use McMaster-Carr for vibration isolators all the time. There are in my experience two ways to match new isolators (non-OEM); one is to weigh each point, and purchase matching isolators. The other is guesstimating the weight, and swapping in stiffer or softer isolators later. In my experience guesstimating often wins out because of dynamic nature of different loads.

All the best, 2PbFeet

I'm not gong to lie I haven't responded because I'm going to show how little I know about these things. By weights you mean the weights they are supporting right? Do the isolators have pretty standard shapes and sizes? How do you match those up? Sorry for my ignorance about this. I did flip over the two front ones and swapped the motor one that I had a replacement for and it does seem a lot smoother but I would like to just change them all since so many were damaged.

 

[2Pbfeet]

I'm not gong to lie I haven't responded because I'm going to show how little I know about these things. By weights you mean the weights they are supporting right? Do the isolators have pretty standard shapes and sizes? How do you match those up? Sorry for my ignorance about this. I did flip over the two front ones and swapped the motor one that I had a replacement for and it does seem a lot smoother but I would like to just change them all since so many were damaged.

Yes, sorry for not being clear the first time. Yes, you need a weight. Isolators come in standard sizes and types.
Because isolators come in a variety of shapes and sizes, bolt sizes, load rating, temperature ratings, and materials, it can be helpful to browse a catalog or use your Google-fu to browse around.

As an example; flange mounts like those in the MEP-803/802.
Have a browse here, including the "about" section at the top,

McMaster-Carr

McMaster-Carr is the complete source for your plant with over 595,000 products. 98% of products ordered ship from stock and deliver same or next day.

www.mcmaster.com

Once you have the style of mount you want, you find the right bolt size, the right weight (load) rating, and how far can allow it to move under vibration. So, that is why you need an estimate on the weight.

Unless you know that you are chasing unusual vibrations or frequencies at odd temperatures, rubber is generally the material of choice. For large gensets, those are often suspended on horizontal coils to take the heavy load and the vibration of those units.

Again, there may well be a nice supply of the OEM MEP-803A mounts. I just haven't ever tried to find them.

All the best, 2PbFeet

 

[grywitt]

I can't help with the OEM isolators, but I use McMaster-Carr for vibration isolators all the time. There are in my experience two ways to match new isolators (non-OEM); one is to weigh each point, and purchase matching isolators. The other is guesstimating the weight, and swapping in stiffer or softer isolators later. In my experience guesstimating often wins out because of dynamic nature of different loads.

All the best, 2PbFeet

I've been looking on McMaster-Carr. I see what you mean. Thank you for the tip

 

[grywitt]

McMaster-Carr is awesome. I don't know why i always forget that.

I'm not finding oem easily but I can definitely find mounts to work with McMaster-Carr. They have exactly the style and dimensions needed.
Thanks again.

 

[grywitt]

Yes, sorry for not being clear the first time. Yes, you need a weight. Isolators come in standard sizes and types.
Because isolators come in a variety of shapes and sizes, bolt sizes, load rating, temperature ratings, and materials, it can be helpful to browse a catalog or use your Google-fu to browse around.

As an example; flange mounts like those in the MEP-803/802.
Have a browse here, including the "about" section at the top,

McMaster-Carr

McMaster-Carr is the complete source for your plant with over 595,000 products. 98% of products ordered ship from stock and deliver same or next day.

www.mcmaster.com

Once you have the style of mount you want, you find the right bolt size, the right weight (load) rating, and how far can allow it to move under vibration. So, that is why you need an estimate on the weight.

Unless you know that you are chasing unusual vibrations or frequencies at odd temperatures, rubber is generally the material of choice. For large gensets, those are often suspended on horizontal coils to take the heavy load and the vibration of those units.

Again, there may well be a nice supply of the OEM MEP-803A mounts. I just haven't ever tried to find them.

All the best, 2PbFeet

Ha ha. I got a quote for new isolators (oem) $1100 for the 4 of them. I think Ill pass on OEM.

 

[Guyfang]

Parts units Mep-802a -Houston 77581

Look at this thread. But hurry.

 

[Light in the Dark]

I've got an 802 I am about to break down soon, can check the mounts when I do if you are still looking.

 

[grywitt]

I've got an 802 I am about to break down soon, can check the mounts when I do if you are still looking.

Yes please do. The two front ones were both very cracked so I flipped them over but I would rather have them correct. Plus the one under the motor I didn't change seems good but If the other 3 were that bad it's got to have had extra stress.

 

[grywitt]

Funny thing.
On McMaster-Carr they have an awesome selection of different mounts in all shapes and sizes but they don't have the mounting holes 3.5" apart in any configuration. Ha ha
I know a guy could drill his own ect but it's still funny. I guess that's why the quote was $550 ea.

 

[LuckeyD]

Good Day: If McMaster-Carr can't get you what you want(sounds like they can), I have the OEM by Tech Drawing of who provides these to the military. On this one. it all lucked out and I seem to have the info using 2 computers to do so. This is a real pain. This gets real flakey trying as some contracts are sole source meaning they don't sell to just everyone but only to a DOD contract. Just yell to @LuckeyD and it sends an email to me and I just looked the vendor up for the mounts. If you see the part number in the manual followed by a CAGE code of 30554, that is PM-MEP a DOD activity and they purchase the part from a vendor using their drawings and proved testing of that part from that vendor who made it to their SPECS. MEP also tested a LARGE mount on some gens but they decided not to go with it if this is found out there. I found an802A in Kandahar Afghanistan and asked them about it. I was at that time the CECOM Master Tech for generators in country. I also had Iraq at that time as well and Europe, and Africa. Try the McMaster as this is normal and probably lose less sleep trying. The gen mount changed about 15 years ago to a new NSN that is in the parts list in the FORUM and it has the newer NSN in there, and the part number changed a little. Remember, these guys may no longer make these items and my info is old now.

Gen MT: NSN/NIIN; 5342-01-442-8343
PN: 770074-2 from Kor Fund Dynamics Corp, Plainview, NY at 35 South Service Road 11803
PN: 88-220027-1 From Tech Products Corp, 2215 Lyon RD, Miamisburg, OH, 45342-4465
PN: RB-X83 From Hutchinson Aerospace IND. 82 South Street, Hopkins Ma 01748-2205

Eng MT: NSN/NIIN 5340-01-366-1553
PN: 25353-11 or 25453-3 from Hutchinson Aerospace address above
PN: 51700-11 Tech Products Corp address above.

 

[2Pbfeet]

@LuckeyD That's great detail to have!

One tip for McMaster-Carr: they can often can get parts similar to, but not exactly what they have in their catalog. I've had to do it a few times when something had to be a certain set of dimensions or voltage or...

It never hurts to ask.

Many moons ago, I bought a few items from Tech products. They were ok then, but no idea about now.

All the best, 2PbFeet

 

[grywitt]

Good Day: If McMaster-Carr can't get you what you want(sounds like they can), I have the OEM by Tech Drawing of who provides these to the military. On this one. it all lucked out and I seem to have the info using 2 computers to do so. This is a real pain. This gets real flakey trying as some contracts are sole source meaning they don't sell to just everyone but only to a DOD contract. Just yell to @LuckeyD and it sends an email to me and I just looked the vendor up for the mounts. If you see the part number in the manual followed by a CAGE code of 30554, that is PM-MEP a DOD activity and they purchase the part from a vendor using their drawings and proved testing of that part from that vendor who made it to their SPECS. MEP also tested a LARGE mount on some gens but they decided not to go with it if this is found out there. I found an802A in Kandahar Afghanistan and asked them about it. I was at that time the CECOM Master Tech for generators in country. I also had Iraq at that time as well and Europe, and Africa. Try the McMaster as this is normal and probably lose less sleep trying. The gen mount changed about 15 years ago to a new NSN that is in the parts list in the FORUM and it has the newer NSN in there, and the part number changed a little. Remember, these guys may no longer make these items and my info is old now.

Gen MT: NSN/NIIN; 5342-01-442-8343
PN: 770074-2 from Kor Fund Dynamics Corp, Plainview, NY at 35 South Service Road 11803
PN: 88-220027-1 From Tech Products Corp, 2215 Lyon RD, Miamisburg, OH, 45342-4465
PN: RB-X83 From Hutchinson Aerospace IND. 82 South Street, Hopkins Ma 01748-2205

Eng MT: NSN/NIIN 5340-01-366-1553
PN: 25353-11 or 25453-3 from Hutchinson Aerospace address above
PN: 51700-11 Tech Products Corp address above.

I really appreciate the time you have put into this. The people on this site are awesome!! I will look into this new info.