Magnum Venus Plastech Megaject MKIV Revision 1_6 - Manual (Page 32)

Megaject MK V Issue 1_6 Page 32 of 41
3. NRV 2 may be unscrewed from the side port after removing 6 mm clear pipe at
union (0665)
4. To remove NRV 1 unscrew resin recirculation valve swivel fitting and then
remove from top head block. It is not necessary to remove resin pipes. Note, a
few drops of resin will leak out so be prepared with rag. When replacing this
fitting, eliminate traces of resin in fitting with solvent then grease threads before
re assembly
5. Inspect all head block and NRV galleries. If catalysed resin is evident, remove or
replace parts as necessary.
6. To disassemble
all NRV’s, remove spring retaining pin. PTFE cone (0489) can be
replaced by removing spring from seat retainer (0490).
7. When using a new PTFE cone, press and turn into NRV seat using thumb
pressure only to ensure a good seal. On re-assembly a suitable hook must be
used to stretch the spring sufficiently to enable the retaining pin to be replaced.
8. Re-assembly is a reversal of above procedures. Inspect head block O ring
(0742), NRV 3 O ring (0747) and NRV 4 O ring (0693). Replace using a small
amount of silicon grease to lubricate.
9. After re-assembly head must be flushed to check all seals are tight and head
galleries are clean.