| DATE |
MAINTENANCE |
| 23 Jul 2008 |
replaced carbon bushings, Kap-Seal vacuum baked displacers; new stage1, stage2, stage3 seals |
| 01 Jun 2010 |
removed from C8 |
| 16 Jun 2010 |
replaced stage3 seal, cleaned; seems in reasonably good shape SS section of stage3 is 0.4957-0.4959" diameter, Envex is 0.4988-0.4992" |
| 02 Jul 2010 |
retest in Berkeley; cold head 'ratchets' when cold at 72 rpm;
displacer stumbles about halfway through exhaust stroke - I don't think displacer is bottoming; temps bottomed out at 61 / 13.4 / 3.5 / 3.6 / 3.6 K |