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Post by SANDMAN on Apr 9, 2006 0:28:51 GMT 8
Sarge, it must be a tappet plate problem if the nozzle is not moving anymore. Does the rest of the gearbox work(does the piston still work)?
The noise from your RD must be a shimming or gear problem. It could realy be a lot of things, but you can't tell unless you realy take a peek inside. Do you have a trusted Airsmith near you? I wish I can do this over the net but it's not that easy...
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Post by sargeniwde on Apr 9, 2006 8:45:35 GMT 8
Sir Stan,
Thanks...the piston does work. I put on the batts and push the trigger to run it...the piston head moves. I see it through an oval shaped hole on the cylinder. I'll also PM you separately to ask for some details.
So, most likely, tappet plate pala.
Sarge
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Post by bienners on Apr 17, 2006 11:02:22 GMT 8
hello sa lahat.. SargeNiwde, i found the forum.. tnx..
question.. my p90 was chronoed at 350fps - according to the gunsmith, 380 daw un, di lang accurate chrono nila.. anyway, di ko napalitan ung mga bushing kc out-of-stock daw.. ok lang ba yun?
one more thing.. ning nagpalit ako ng spring, the gunsmith had to drill a hole, i guess para makabit ung spring.. is this normal? wala kc akong alam sa 'tech stuff' ng p90..
and i need help on the proper maintenance of my p90.. para tumagal siya.. what parts should i change, what spare parts should i stock on, etc.. things like these.. any help would be greatly appreciated.. tnx, tnx..
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Post by sargeniwde on Apr 17, 2006 12:14:19 GMT 8
Hello Bien,
Welcome on board!
First is...if you changed your spring...what spring did you put on? The stock gearboxes would be having plastic bushings which can tolerate only stock springs. So if you put on a strong spring...eventually your bushings will give way. I suggest you change to metal bushings...these two are inseperable...Spring upgrade and metal bushings.
2nd...as for the hole drilling, do you know which part the hole was made?
And to make your gearbox rigid...pwede mo ring palitan yung spring guide and piston head with bearing types, so you won't get your spring stressed so much.
Well, if you only put an sp120 there...change of bushings to metal type, change of spring guide and piston head to bearing types should be enough to let you use your P90s for quite a long time.
Sirs Stan, SubbieDoo, D7K, and the rest of the P90 Gurus...please feel free to add to give bien some advice.
Sarge
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Post by bienners on Apr 18, 2006 8:52:20 GMT 8
im using a Prometheus ms110sp spring.. i figured, less stress must mean less wear-n-tear.. no monster setups here.. nag-order na rin ako ng bushings, just waiting for the shop to call me.. as for the hole drilling, 'di ko sure kung ano ung binutas nung gunsmith.. basta on my way out of the shop, i saw him pick-up a drill bit and started drilling 'something' manually.. i just assumed it was ok.. i'll go ask him when i stop by the shop..
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Post by bienners on Apr 18, 2006 16:14:59 GMT 8
can someone please hook me up with metal bushings? gusto ko lang mapalitan ASAP.. 'di sure ung shop ko kung kelan sila magkakaroon.. tnx po.. mabuhay mga p90 users!
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Post by sargeniwde on Apr 18, 2006 18:04:54 GMT 8
Bien, I just PMed you some numbers of hobby shops that I have on my list. You may try calling them to check on the stocks of bushings for the P90. Sarge
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Post by SANDMAN on Apr 18, 2006 23:21:02 GMT 8
I guess the best guess would be that your airsmith was drilling or "PORTING" holes into your stock piston head. Thats a basic/standard upgrade and should help your compression a lot.
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Post by bienners on Apr 21, 2006 15:34:09 GMT 8
sarge p9t and sandman.. tnx for the help mga sirs.. greatly appreciated..
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Post by johnmkt on Apr 26, 2006 7:34:57 GMT 8
Sir, question. got a 2nd hand P90TR. upgrades M120 spring, metal bushings, shims, ported head and nozzle and it shoots 400++fps according to the 1st owner. tested using poor mans chrono, when i first got it, it can easily penetrate the top and bottom part of the can after a month of use it doesnt do it anymore. the batts are ok (sanyo 9.6v 1700mah) using .2 bb and i make sure to de-cock and clean the barrel after use. what could have been the problem? any recommendations? thanks
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Post by SANDMAN on Apr 26, 2006 9:21:33 GMT 8
Loss of FPS during normal use can be attributed to the ff reasons:
1. Cut spring - since you have an M120 spring but no spring guide with bearing or piston head with bearing- it is possible that your spring has recently been cut due to the the extra stress of not being able to turn on it's axis(M120 springs are also cut very easily due to their stainless steel construction) - if spring is cut and needs replacing- I strongly suggest you install an SP120 spring and a version-2 spring guide with bearing.
2. Loose compression on the piston head o-ring. Your o-ring may have shrunk and therefore you don't have full compression anymore in your cylinder system. Or.. you may simply have lost the lubrication on the cylinder - allowing air to leak past the o-ring. - a simple lube job and/or o-ring replacement will solve this.
3. Loose compression on the cylinder head/cylinder seal- same as above...
4. Loose compression on the nozzle to hop bucking seal- damaged hop nozzle, insufficient forward movement of the nozzle - see also number 6
5. Worn out hop rubber-
6. Exclusive to the P90- loose gbox retaining screws on the rear plate- if the gbox is not securely fastened to the body of your P90- the nozzle won't be able to reach the hop up rubber- therefore allowing air to leak out. Make sure your gbox is securely fastened to your P90 body. Check the screws- try to move your gbox forward/rearward if there is any play. Idealy- there should be none.
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Post by johnmkt on Apr 28, 2006 18:03:43 GMT 8
thanks for the advice sir sandman. I have another problem, had my gun opened for cleaning and maintenance and when we opened it the tappet plate broke. help sir, where can i buy a replacement tappet plate, tried calling some airsoft armories and they dont have the part. thanks
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Post by SANDMAN on Apr 28, 2006 19:46:28 GMT 8
Hehehe... that also happened to me earlier this year. I opened the gbox but forgot to de-cock it first. Ayun! Sapul ang tappet plate!
I'm afraid I can't guide you to an Airsoft Shop where you can get yourself a P90 tappet plate unless you're from Davao(coz I am). However, the other p90 users of our forum may be able to help you out.
Good Luck!
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Post by onejohndoe on Apr 28, 2006 22:05:51 GMT 8
I've noticed na marami nga nasisiraan ng p90 tappet plate habang binubuksan ang gearbox. Is this exclusive to the v6 gearbox?
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Post by SANDMAN on Apr 28, 2006 22:19:28 GMT 8
I've noticed na marami nga nasisiraan ng p90 tappet plate habang binubuksan ang gearbox. Is this exclusive to the v6 gearbox? It's actualy exclusive to Airsmiths who FORGET to de-cock the gbox before opening it.
I'm still kicking myself for doing exactly that a couple of months ago. Ang hirap pa naman maka-hanap ng P90 tappet plate dito sa Davao. Buti na lang may nakapag-hanap para sa akin sa Manila.
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