Need info about this Nemrod

[rsalvarez]

Hi, this is my first post, my name is roberto Alvarez From Baja California in mexico, i just bought an pneumatic speargun, i did not know abou it it, i just read some post´s on the forum and see the spearguns on ebay and like the movement of a witch hand i found and bougt this in less than 2 hours , looks complete and before unscrew it to "CLEAN" i want to ask for more info, here as i can´t find a nemrod website so i pledge for help,

the lenght is 1,5 meters like 60 inch long, thanks for any info

 

[Fondueset]

I believe thats a Nemrod Galleon - or something in that line. It is quite old and has been out of production for decades. You may want to post over at Spearboard Spearfishing Community - Powered by vBulletin as well to get information about possibly fixing it up so it will work. I think it is getting difficult to find parts - but there may be some here and over there who have more knowledge than I.

 

[rsalvarez]

Thanks , i am learning about this tools, will be great follow your recomendation, thanks Mr.

 

[popgun pete]

Your speargun is a Silver series Nemrod. They were produced in four barrel lengths, the longest being the "Filibustero" followed by the "Corsario", "Bucanero" and the "Comando" which was the shortest model. The two longer guns had a power regulator in the tail cap. Rotating it varied the air transfer ports inside the rear of the gun to provide a throttling effect which slowed the shot when progressively smaller ports were selected. From memory there were three power settings. From your photos I would think that this is the "Filibustero", the longest version.

Provided the gun works I would not dismantle it, maybe change the oil by unscrewing the muzzle and pulling the piston out to empty out the old oil and then replace it. Make sure you let all the compressed air out first! Spare parts are extremely hard to find and many will have passed their "use by date" as the rubber components revert and lose their mechanical strength.

 

[rsalvarez]

Thanks for the oil info, did you remember the working presure? i will follow you recomendation as this hold fine the presure, i will not disasemble and
will never use it will keep as a good example of eurodesigng

 

[popgun pete]

I have lost the Nemrod instruction book, so I cannot look it up, but from memory it was around 15 to 20 Bar, maybe slightly more. Usually you pumped these guns up until you could just load them, the gun itself could always take more air pressure, but would become difficult to latch if too much air pressure was used. The Silver series spearguns have metal pressure bulkheads at either end, so are strongly built, but have a relatively small body diameter (35 mm) so do not float after spear discharge. Some divers thought bigger would be better and purchased a "Filibustero" only to find to their dismay that they could barely load it, so soon retired it. Hence their guns can appear on eBay in reasonably good condition, but lack of spare parts makes them less attractive as a user speargun today. Plus they will not have gotten any easier to load!

 

[rsalvarez]

there are a similar speargun on the market today? as i can see all are hard to load my cressi SL55 is hard to load and is newer
what about explosion risk due hidrostatic or metal fatigue?? can be? i was trying to modify a ripman 89 paint ball marker to speargun and looking i see this but never ask about their age.

 

[popgun pete]

There are no similar mid-handle spearguns available today unless you source a speargun from the former Soviet Union countries, however most of their guns are short for use in their generally lower visibility conditions. The lighter construction rear handle pneumatic spearguns have replaced mid-handle pneumatic spearguns nearly everywhere as they have proven to be more versatile weapons for freedivers and are less expensive to manufacture (due to fewer components). The older mid-handle pneumatic spearguns were good for fishing in tight reef areas, but less successful when greatly lengthened for undertaking open water work. The mid-handle position was OK for the balance of the gun, the guns being heavy, but not so good for aiming with the long rearward projection from the centre handle of the longer models. Rear handle guns are much easier to aim as the sighting radius is maximised (being the full length of the barrel), unlike the situation with a true mid-handle (i.e. a central handle) speargun.

Pneumatic spearguns are built with a safety factor in their construction so that they will not blow up. Also the ability to pump in air is limited by the dimensions of the hand pump, once past a certain point it becomes virtually impossible to add more air to the gun. Usually this will be at an air pressure where it is too difficult to load the gun in any case.

Age of spearguns is a factor in terms of being able to source spare parts like seals and pistons which can wear out. Inner barrels can also wear out eventually due to accumulated scratches and surface corrosion penetrating through the anodised bore's surface, a lot depends on where the gun was used and how well the owner maintained it. Often it is easier to buy a new gun than buy a new barrel, if you can find one that is.

 

[rsalvarez]

Age of spearguns is a factor in terms of being able to source spare parts like seals and pistons which can wear out. Inner barrels can also wear out eventually due to accumulated scratches and surface corrosion penetrating through the anodised bore's surface, a lot depends on where the gun was used and how well the owner maintained it. Often it is easier to buy a new gun than buy a new barrel, if you can find one that is.

Thanks so much for the information and time i just clean the SL to know how it works from inside, and see the barrel, piston (like brake pump pistons), i never before open the speargun and see the oil inside , this is an special oil?like the one used on the scuba regulator grase used were compresed air can explode at high presure??? from the battery to the right are the piston,the nut,the outer body of a cressi-sub 70 cm were i see the oil,below the spear and the gun body, sorry for the bad photo quality.

??
THANK´S MY FRIEND

 

[popgun pete]

Mares say that their pneumatic spearguns should use a light oil of SAE 10 grade which has a low viscosity and does not contain any graphite which could lead to corrosion inside the gun. The most convenient source of such a light oil is motorcycle fork oil which goes inside their front telescopic shock absorbers, it can be purchased at auto parts stores in various grades, the thinnest oil being SAE 5 grade (the higher the viscosity of the oil the larger the SAE number). Unless you spearfish in extremely cold water SAE 10 is fine. The advantage of using motorcycle fork oil is that it is designed for the same operating requirements that exist in a pneumatic speargun and comes in handy plastic bottle packs. The same stuff can be used in all brands of oleo-pneumatic spearguns, which is the correct name for most pneumatic spearguns. The oil has low viscosity so that it flows easily inside the gun and reduces friction, you only need about 15 ml in a small speargun and 35 ml in a longer one as you require enough oil to spread around inside the gun, the oil will coat every interior surface, so you need enough to go around and still have some free flowing inside the gun.

 

[rsalvarez]

I am a Motorcycle and Boat mechanic and soon oleopneumatic gun builder
i am very interested in this area, i have the fork oil on hand i use yesterday a lube oil named here WD40, this cleans an lubricate like petrol penetrating oil.
thanks fot this, i will receive the nemrod this next freeday and will see how its really. thanks mr popgun pete
the speargun is legal in mexico for sport fishing so lets see.

 

[rsalvarez]

I just open the nemrod and the piston seal´s are damaged some one try motorcycle brake pump seals??? i have the idea but not sure if will work

 

[popgun pete]

Whatever you use has to be the right size and length to fit both the internal barrel bore and the spaces on the piston where the seals sit. Unless Nemrod used a moulded rubber seal used in other applications the chances of finding anything suitable is remote.

 

[rsalvarez]

Whatever you use has to be the right size and length to fit both the internal barrel bore and the spaces on the piston where the seals sit. Unless Nemrod used a moulded rubber seal used in other applications the chances of finding anything suitable is remote.

thank´s i will post a picture of the piston and size latter , thank´s