Help servicing Nemrod Corsario

Air pressure cracked the rear plastic cap, that is why it is split. The inlet valve leaked, which looks to be missing. Your gun is a "Bucanero", the "Corsario" had a power regulator knob at the rear. Both are Nemrod "Silver series" guns. Unscrew the muzzle, then pull the rubber grip section off and undo the knurled metal ring behind it. Take the plastic handle off by undoing the transverse screws, then undo the vertical screws that hold the metal frame that the plastic handle fits into onto the outer tank. This frees up the thick metal shroud casting that surrounds the inner barrel in the centre of the gun, the vertical screws penetrate the tank and hold all these elements together. The rear bulkhead screws off with the inlet valve body. Like all air guns the inner barrel is the structural element holding the gun together and is threaded at either end. Exceptions are guns with threaded outer tanks, then the inner barrel can be non-threaded at the rear end as it does not have to hold the gun together as the rear tank forms part of the gun structure. The "Silver series" Nemrod guns have plain tube tanks.

spoolin01 said:

Thanks, I'll take another look at the front section. On mine, there was a knurled nut immediately behind the nose cone, forward of the rubber grip, which appears to be formed around a thin aluminum tube that rotates freely about the barrel, but I haven't been able to move it laterally. I'll try harder.

For the back end, in the pics Djohn posted, it looks like the fill port and pump fittings are the reverse of the current rear-handle design, with a male fill port and female pump end. If that's so, then it appears the fill port/valve on my Bucanero is still stuck in the plastic end cap, is that right? It looks like I need to grip the threaded back end of the port insert, and twist on the cap.

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The ribbed black plastic end cap should have nothing inside it, so as you say the rear valve body is still in the cap, it just screwed out of the inner barrel tube instead of the cap screwing off it.

The black circular band of a slightly different shade on the photo of the removed tail cap is a rubber seal with an angled front face pointing into the interior of the cap. The seal is there to keep water out of the cap when the gun is underwater as the interior of the cap is not meant to be pressurized. A leaking inlet valve will tend to create pressure in the cap over time and that is why they split, I had to replace mine for that reason.

The Nemrod rear caps in yellow will fit, they are the same cap used on the later mid-handle models with slim front barrels. I used one of the yellow caps until I found a black cap for the gun to replace the original cap which split. The inner barrel tube can be rotated in the cast aluminum shroud section that encircles the inner barrel in the centre of the gun, from memory a set screw holds it in position once the parts are properly aligned. Someone in the past probably twisted the inner barrel and it rotated out of position, that is why it is not properly lined up now. It may have been slightly out from the factory, the guns were assembled in a "close enough is good enough" manner, if the gun worked then it got a tick to pass inspection. The "O" ring jammed in a thread sounds like a later "fix" by a previous owner, probably because the inner "O" ring was damaged in the front pressure bulkhead and was slowly leaking air, so they added this extra seal to stop air working out along the screw thread. I tried that "fix" myself, but ended up replacing the bulkhead "O" ring once I realized that it was the culprit.

It sounds like the faucet washers work as the guy who posted about it should know. You may be able to obtain a genuine piston seal from the guy who started this thread http://forums.deeperblue.com/pneumatic-spearguns/83802-nemrod-comando-speargun-parts.html, he seems to continually be able to find new old stock to keep his guns going. The inlet valve is another area to consider, it uses a fat section small ring that seems to be squashed nearly flat, not being able to replace it sidelined my gun.

The rubber line wrap hooks can tear off, they don't last forever, especially the one in front of the grip, as the rubber gradually deteriorates with time. Rubber muzzle features absorbed knocks and bumps and were OK while you could buy replacements, but their non-availability meant either something else had to be substituted or the guns retired.

These "Silver series" guns were good in their day, but unless you really need a mid-handle layout there are much better guns around now.