ORIGINAL: swampy57
I have two jj1800 full auto start
One destroyed it self on take off (saved the boomerang XL) the unit seized the rear bearing and I don’t believe it is worth repairing and neither does JJ
sent it to jj for warrenty was sent back unrepaired with quote of $900 (approx) only the outer case and starter are left.
Mounted the second in the boomer and rear bearing on this one began to rattle after two flights.
Have tossed them under the bench for a later project. Maybe
Hi,
I report on the Post #: 1663 that the 2 bearings are not precharged on the jj-1800 due to the two o-ring. The spacer how make the precharge after the spring don't slide smoothly!
For information You don't have to open the turbine engine to check the preload. Just push from the front the compressor nut, it must move ~1mm rear and when you release it must come back the initial position due to the preload spring and spacer inside.
Sorry for my english