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Evvy, I have been around the block a couple of times. When you take out the bearings to change the diode ring, examine the bearing very very closely. If it is of questionable origin, replace the Bearing with a high grade NSK, SKF etc Bearing. The fleecing of American Tax Dollars….. Picture of...

Since this is not a Marathon product, I would say it was procured from the lowest bidder who overhauled the gensets under contract. I am sure this bidder did not have these diode rings manufactured by a union shop, a class of 6th graders in Wisconsin or any reputable US shop who could produce...

Chinesium…….

“Its not easy. You will learn to use new words that are not to be repeated in church.” Amen :usafss::beer::grd:

Evvy, On your assortments of leftovers, is there any evidence that one of those rivets broke out? Three brackets, six rivets. If I am wrong then every bracket should have the fiberglass disk underneath held by two rivets like the one in the picture I used

Evvy, don’t blame me, but you asked for it: piss poor design

Evvy, I am pretty certain I found the cause: the Bracket # 43 is mounted to Fiberglass Disk # 44 with rivets One rivet broke out on the disk side from centrifugal forces and vibration this send the assembly off balance and it self destructed the DoD design uses here hex head bolts with...

Evvy, Reflecting on this missing lock washer issue and the explosion drawing of the 400 Hz Assembly, I would like to point out the following: The Disk #44 is a composite of 1 Disks Part # B-718817-01 3 Disk Part # B-718930-01 those are held together with lock washer #30 and Machine Screw # 31...

Guy, New Jersey Semiconductor advertised the 1N3663 1N3663R as: iN3659thru 1N3663 (SILICON) (DO-21) Low-cost silicon rectifiers in hermetically sealed, press-fit case, designed for operation under severe environmental conditions. Cathode connected to case, but available with reverse polarity by...

Guy, I was under the impression that the 400Hz Versions always used a different AVR then the 50Hz/60Hz On the 002A/ 003A / 004A / 005A A11 there are quite a few parts (Resistors, Diodes, Capacitors) on the Voltage Regulator Board which you have to change between 50Hz/60Hz and 400Hz The same is...

Just read your explanation, and posted a Diode recommendation. However, if I understood Evvy correctly, then on her Diode Ring with the 1N1190 / 1N1190R there were no lock washers. That's why I would recommend that if you own a 804 A/B to very thoroughly check your Diode Ring and replace...

Oh what a Story, If you built your own Diode Ring use the 1N1160 and 1N1160R, they are definitely the better Diodes. Don't forget lock washers on everything is threaded on this assembly, otherwise it will become a projectile at 1,800 rpm

Here are the two Datasheets.

Evvy, The question boils down to of which Diodes they installed

So, this should be a warning to all 804 A/B owners: There seems to be an x amount of 50Hz/60Hz 804's floating around out there which MAY {edit} have the 400 Hz Diode Ring Installed without lockwashers {edit}. The Diodes are different: The Diodes on the 50Hz / 60Hz Diode Rings have a Lower...

Evvy, here are the parts associated for the "Diode Ring" 50Hz / 60Hz: 400Hz: Further, by looking at the parts drawings in the TM I think it is clear of what happened here: Peter

Evvy, These Diesel engines are optimized to put out the highest torque at app 1,800 rpm At 300rpm you probably going to get 30% of the rated Torque which would reduce your maximum power output to 15KW x 0.3 => 4.5KW Your better off with a 5KW Genset then Peter

This is interesting, I looked at the two eBay listings and both seem to have suffered the same fate plus the one in the video FLCarguy posted as well. That makes 4 Diode Ring failures. This raises some questions. The red material, where the diodes mount to, looks to be a fiberglass substrate...

NSN 6115013833124 Two versions with two CAGE # the Made in Mexico has the screw type Diodes and is DMIL A1

Evvy, Sorry to be the bearer of bad news, but this board has been “occupied “ by civilians and when ever the insider say something then the civilians go 😭