New HW77 Teardown?

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Uslanja
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New HW77 Teardown?

#1 Post by Uslanja »

Good day all, been watching videos from Nick at TBT (Tin Bum Tuning). He sounds English but believe he is in France somewhere. Anyway, he recommends opening up and cleaning every new Weihrauch gun. The reason being that during the manufacturing process a packing grease is used for the purpose of preventing rust during inventory storage. That the grease used is not for lubricant purposes. So take the main spring and piston out and de-grease them.
Then polish the piston skirt and inside the compression tube. Of course at that point might as well install a TBT Tune thereby smoothing out the cocking, shot cycle and reducing/eliminating spring vibration. Thoughts?

I have been shooting (not as much as I would like) an HW77 that is about 2 months old now. I have not lubed any part of the rifle. It does have a main spring buzz.

I have read about lubing with red tacky grease on the spring as well as a Molly grease. I have read that the red tacky will quiet the buzz but also cause significant FPS variations. Have also read that the red tacky will somehow hold moisture and accelerate rusting. And then there are Lithium greases as well as PTFE and Dry Film lubricants. And then there are the divergent opinions on the pros, cons and viability of these lubricants. Believe it or not, I have actually been spending time researching and studying oils, greases and pastes. This foolishness has to stop 😮‍💨 I just want to shoot my air rifle!

So what do you think? Do I tear it apart? Do I put a tune kit in it while it is opened up? Should I pursue some type of degree in lubrication? Wow, powder burners were never this much work!

On a positive note: I did not sleep at a Holiday Inn last night but do feel rested. 😅
averagejoe
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Re: New HW77 Teardown?

#2 Post by averagejoe »

It is always worth tearing apart a new gun for a clean up and regrease at the very least. Factory guns can have sharp burrs that damage the piston seal when being assembled, swarf that was not cleaned out that damages the seal and compression tube, usually over greased, and so on. Also I have heard the new style "thick lip" HW piston seals are not as good as the older style "thin lip" ones.

The usual things are to deburr and smooth all the holes and cutouts using a file, sandpaper on a stick etc, completely degreasing the piston and compression chamber (and spring etc if you are reusing it), inspecting the seal and tube for damage from burrs or swarf, properly relubing and assembling it all back together. Polishing the piston and compression tube is generally not NEEDED unless there is damage but if you have the skills and ability and it is already apart.... :lol:

The pros of a quality kit is you will get a spring that is properly finished with flat ends, sometimes polished, and is usually pre compressed to final size, a spring guide and top hat fitted for that exact spring (tight fit) which removes spring twang/buzz without any red grease or spring tar needed and prevents the spring from kinking. The plastic top hats will also twist more easily reducing torsional (twisting) recoil. The only grease you need on the spring is a light film to reduce friction inside the piston which is preferred, especially in our colder climate. While you are thinking on that might as well check out Brit Seals for HW piston seals :rolleyes:

I used Krytox grease instead of molly when I did my 2 spring guns simply because I got a tube for free and it doesn't diesel. Otherwise use a high molly content grease and not much of it.

Nick is indeed English and moved to France a few years back.
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lauchlin
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Re: New HW77 Teardown?

#3 Post by lauchlin »

I would shoot it till it breaks in 1000 rounds (pellets) now if you feel you need to take it apart go crazy .I do not routinely take apart my guns when new .............
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Temesvar
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Re: New HW77 Teardown?

#4 Post by Temesvar »

May be a good thing to shoot the gun for few months, to get used to it as it is. Just then make changes and will feel the difference.
Should you take it apart as new to grease it?? I don't think so, but that is JMHO. The compression chamber can be polished to a glass
finish, but see no reason to polish the piston. It has clearance, and surface is good enough and holds the grease better than a polished
one. Was going to try the TBT kit, but they did not reply to my mail. So got the Vortek kit and am happy with it. Like the design better
than the TBT. and the Vortek piston seal is self lubed. Whatever you chose, good luck and have fun! :wink:
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Dukemeister
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Re: New HW77 Teardown?

#5 Post by Dukemeister »

lauchlin wrote: Mon Feb 03, 2025 11:54 am I would shoot it till it breaks in 1000 rounds (pellets) now if you feel you need to take it apart go crazy .I do not routinely take apart my guns when new .............
What lauchlin said ^^^^^^^.
When new, I typically clean the barrel bore before shooting groups or pellet testing. Maybe add some moly to the trigger contact points, but opening it up is usually not necessary and will likely void your warranty. I've read many posts about system failure in the first tin or 2 that have been fixed under warranty, which you can expect to be honoured if you buy from a reputable supplier. If you feel the need to open it up and tune later then go for it. I had guns fail on me soon after I got them, some supplier stepped up with warranty some didn't.
Temesvar wrote: . The compression chamber can be polished to a glass
finish, but see no reason to polish the piston.
Be careful polishing the cylinder, it can be tricky and unless its scratched or corroded (like a very old gun) its likely unnecessary and you could end up either tapering the bore or making it wavey. And you really only need to polish or button the rear of the piston since the head never touches the cylinder, the piston seal sits proud of the piston and keeps the piston from contacting the cylinder. Get a ball flex hone for cleaning up the cylinder of you see corrosion or scratches. If you do install a tuning kit, then pedal to the metal might as well polish and lube at that time. :drinkers:

))))----//----------==

Iacio, ergo sum
Temesvar
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Re: New HW77 Teardown?

#6 Post by Temesvar »

[quote=Dukemeister Be careful polishing the cylinder, it can be tricky and unless its scratched or corroded (like a very old gun) its likely unnecessary and you could end up either tapering the bore or making it wavey. And you really only need to polish or button the rear of the piston since the head never touches the cylinder, the piston seal sits proud of the piston and keeps the piston from contacting the cylinder. Get a ball flex hone for cleaning up the cylinder of you see corrosion or scratches. If you do install a tuning kit, then pedal to the metal might as well polish and lube at that time. :drinkers:
[/quote]
By polishing the inside of the compression tube i meant polishing! Not using a stone or abrasives. Just steel wool will do the job,
preferably on a lathe. That will also take care of the sharp edges that are not cleaned from factory.
Daryl
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Re: New HW77 Teardown?

#7 Post by Daryl »

lauchlin wrote: Mon Feb 03, 2025 11:54 am I would shoot it till it breaks in 1000 rounds (pellets) now if you feel you need to take it apart go crazy .I do not routinely take apart my guns when new .............
Ditto! I've yet to take any of my air guns apart. The HW's(all springers) just keep on ticking, right from new. 2 HW97's, an HW98 and an HW80.
2 .177's and 2 .22's.
When and if they break down, I'll do what's necessary.
Best Wishes
Daryl
Uslanja
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Re: New HW77 Teardown?

#8 Post by Uslanja »

Hi All. Thanks for the responses! We'll the majority says shoot it and do whatever later if it breaks. So I'll keep shooting for a bit.

It does have an annoying spring buzz that I will tackle in the near future though. Rather disappointing to hear the buzz and from doing more reading it seems to be a Weihrauch trait. Anyone know if that is true? Most likely install a tune kit of some type but the Red Tacky grease woud be quicker and cheaper. Or should I just sleeve the piston? I am assuming (you know what they say about assume 😉) that sleeving the piston is to eliminate spring noise. I do not drink any type of alcoholic beverage but I understand that beer can metal is just the right thickness for a sleeve. Hhmmmmmm......🤔 might have to take up another hobby...... just to support the airgun one! 😉

The two tune kits that I have seen are from Vortex and TBT. The Vortex looks like some type of metal and the TBT is a Delrin. The Vortex is currently out of stock and will cost about 150$. The TBT is available and with exchange about 90$. The understanding is that the TBT kit will also address torsional recoil and I do not know if the Vortex will.

This airgun stuff is becoming an illness. I spend my spare time scouring airgun sites and watching YouTube shooting videos. I'm even envious of those English guys that seem to have so many ratting places to shoot at! And then there is South Africa with marauding bands of baboons. Down south the Americans have hogs. And I have to wait for squirrel season. Just not fair! But an illness for sure.
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lauchlin
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Re: New HW77 Teardown?

#9 Post by lauchlin »

Daryl wrote: Mon Feb 03, 2025 9:36 pm
lauchlin wrote: Mon Feb 03, 2025 11:54 am I would shoot it till it breaks in 1000 rounds (pellets) now if you feel you need to take it apart go crazy .I do not routinely take apart my guns when new .............
Ditto! I've yet to take any of my air guns apart. The HW's(all springers) just keep on ticking, right from new. 2 HW97's, an HW98 and an HW80.
2 .177's and 2 .22's.
When and if they break down, I'll do what's necessary.
lol i have repaired a hundred or more that have been
so called fixed or tuned ? and many from this forum
VE7SHM//VE7ZJ

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Daryl
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Re: New HW77 Teardown?

#10 Post by Daryl »

Not surprised. The HW98 .22 that I sold a friend locally shoots it a lot. Last time I talked to him about it, he was on his 4th or 5th sleeve of Hades pellets through it and had replaced the spring twice.
Daryl
Best Wishes
Daryl
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