Posted by EricP on November 01, 2001 at 06:30:46:
Does the Piston seal on
the FWB601 ever need any lubrication? I have put probably 3000+ rounds through
the gun and was wondering if any maintenance was necessary to the piston seal
and at what intervals? It appears that the gun had an extremely fine coat of
clear/white grease (like FWB joint grease) on the seal when new, but that is not
visible anymore.
Thanks,
Eric
Posted by pilkguns on November 01, 2001 at 07:21:31:
at some point you
will need to have the gun gone through and checked but 3000 is not many shots.
are those your shots , i.e., you bought it new or are there more in its history?
There is really no way for a user to lube the piston, I would recommend us, or
Randy Bimrose for service. Basically I wouldn’t worry about it till you start to
notice a decrease in accuracy
Posted by EricP on November 01, 2001 at 18:41:40:
The gun only has 3000 or
so rounds since new, but the gun was purchased in 1994 and sat with little use
until about 6 months ago because of school/work demands. With a bunch of guns to
shoot and the 601 not being scoped until recently, it received little use.
I
guess what I should have asked is what does FWB use and what do you use to lube
the pistons on these guns? I am as interested in the internal workings of the
guns as much as shooting them. I have also found that the manufacturer’s
suggestions can be improved upon. In the case of the two 300s I have, I found
that a rework of the guns paid huge dividends in smoothness and sound even
though FWB says do not lube them. A complete disassembly, cleaning/degreasing,
polishing ends of mainsprings and rear guide (removed tooling marks), lightly
burnishing molly on the spring guides, very light coating of Maccari velocity
tar on the outside of the mainsprings, and couple of drops of ultra lube under
the steel piston ring did wonders. Both guns before work shot regularly in the
600-605 fps range with 8.2 match pellets with a fair amount of spring twang for
a $1000 gun!! Now they are just a dead thunk with no twang and shooting 600-605
fps on the chrono....accuracy as before immaculate.
I would like to clean and
rebuild the front end of the 601 too as I am sure a fair amount of dust/grime
have gotten into it sitting all these years. There seems to be two schools of
thought on the pneumatic guns. The IZH-46 type guns requiring light oil, and the
FWB/Anschutz guns saying to use nothing. I would like your opinion on why this
is. I have already looked into the rear end of the gun and noticed that FWB
keeps the valve dry. Also a bit amazed that on a gun costing so much that there
would be tooling marks in the staging chamber...thankfully the seat that the
urethane seal sits on has no marks other than a few small nicks on the inner
circumference. The check spring was very roughly ground on the ends...a bit of
polishing/cleaning took care of this. Also noticed that the hammer spring was
very roughly ground...same treatment here. After reassembly the extreme spread
of the velocity went from 8-10 fps over a ten shot string to 3-6 fps. It may
have been more dumb luck in the reassembly getting the vale seal just right, but
results are results. I am just looking for improvements on the front half of the
gun now...if nothing else than to clean out the old gunk, but I am not sure what
lubes to use on the single stroke pneumatics as detonation here could be
disastrous.
Thanks Again,
Eric
Posted by Eric Helfrich on November 02, 2001 at 23:20:59:
: I don't have
any info on the 603 but I did a complete tear down and rebuild to my FWB 90
pistol when I bought it used. Just as you stated about your FWB 300 my FWB 90
shot dead calm with new piston seal springs, new internal external bumpers and
some Macarri velocity tar on the spring guide and a touch on both springs
(pistol has 2). It only lost about 5 fps after the tar, shoots 7.6 walther flats
at 485 fps now and has no TWANG. It did have a significant spring twang before
this. I had never opened up any pistol especially an FWB target pistol before
this. I did have experience with installing spring kits in sporting
airguns.
I love to see the inner workings of these guns. There was even a
stamped mark in one of the screws ( I think it was the retaining screw for the
cocking lever) put in at the factory. Taking the gun apart breaks this stamp so
you could see the gun had been taken apart and gone into! Enjoy your
603!
Eric
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