CHARLIE.......

[jct842]

i  got around to pulling my rws 45 apart to see why it's sear would not catch.  found the new spring must have been in the way.  I twisted it so the end of coil and a space came up where the sear drops over it.  is catching good now.  guess I need to make a washer on my lathe to spring can be in any position.  it is a old 45 that has the leather piston end.  with crosman pointed I get 740-745 fps, is that about right?  seems low to me.  with them gamo gold hs pellets and a drop of 3in one oil it is running about 1250!   not good to do that but thought i would try it.  

what I am thinking about for a rear washer is maybe 1/8 thick, id,.... just enough to let the guide go thru, the od...some what smaller than od of the new macari spring.

I just saw a copy of my spring compressor on the pyramid blog...using a bench vice tail as a ram.......and no I didn't see it first before building mine.  is real easy to set up with long dry wall screws to hold a 2x4 to bench and a lenth of pipe strap to hold gun in it.  is super easy to pull a gun apart with it.  since it was all scrap it was a free-be to me.

john

[CharlieDaTuna]

I've never had one of the early RWS 45's in and not sure how much clearance is needed. Putting in the washer might do the trick as long as there is enough room for the spring to compress without becoming coil bound. I don't know what spring you used and how many coils and wire diameter it has but you should be able to measure out how much allowable  room you have and calculate it out.

It’s easy to check how much available space there is with the rifle disassembled. Here is how to do it on most actions and it should be quite similar on yours.

With the spring and guides removed carefully measure the distance between the face of breech block (which includes the trigger locking assembly) and the back of the seal piston, with the assembly (seal piston and breech block) in fully cocked position. Be sure to deduct the slight distance the plunger shaft can move back past full cock or allow for it in your measurement.

 This distance can also be used to determine the maximum length of the spring guide after deducting tophat length and clearance. Determine the coil bound length of the spring-Number of coils x wire thickness. Example: Number of coils is  (32.5) x  wire diameter of (0.128 ) = 4.16”. Measure the number of coils carefully. Add a little to the calculated coil bound spring length as a factor of safety (say 1/8 to 3/16”) to use as your coil bound spring length.

 The distance you measured above less the coil bound spring length is the space available for “top hat” spacers and thrust washers. If you exceed this you will be running the risk that your rifle will not cock when it is reassembled.

This might simplify it some:

 First determine the measurement from the inside front of the piston to the front of the end cap with piston in it’s latched back position, and then deduct the thickness of the rear spring guide  seat flange if applicable.

Calculate the stacked height of the coils by measuring the wire diameter of the spring times the number of coils.

Now subtract this stacked dimension from the previous dimension determined in the first step.

The difference between the two is the max spacing you can add, but I recommend giving yourself about .125 or 1/8  or so inch room for error allowance and to prevent any cocking issues in the future.


I have an Excel spreadsheet that I use for calculating spring spacing if you think you can use it. Just e-mail me and I'll send it to you as an attachment.   Shhh...don't tell no body tho :p    :p     :p

[jct842]

I will have to calculate the old fasioned way...........I have not had windows in my computer since winXP came out!  can't run windows programs directly. .  I used the recomended spring from jm. think it was the gsi.  was wondering about the velocity, if that sounded right.  it is though, the smootest the gun has
ever shot. my tf-79t shoots harder.   I really dont remember how hard it was to cock when new, that was 20 years ago and my body has got a lot weaker.
john

[CharlieDaTuna]

I've never been through an older RWS with the leather seal so I really don't know. Also, you didn't state whether it was a .177 or .22. If JM recommended it, it is probably the GSI spring. That's what I use.

[jct842]

IS A .177   I think it was sold to me new as a 1000fps gun,  other people claim it might be a 900fps one.  it probably doesn't have quite the power it had when new, but i am thinking maybe it should be more than the 740 that I am getting.  john

[CharlieDaTuna]

The spring might be getting a little tired but that velocity isn't too bad though. The right chamber lube should help some.

DO NOT USE 3 in 1 OIL or any other petroleum products. There are very few things that can be used in the chamber as a lube. It can cause damage to both the seal and the spring.

 Look in the Library in the maintenance section. I have an article there called "All about lubricants" In that file, look at the one called "Charlie’s Chamber lube". It's a lube just for leather seals and should help it out. I suggest lubing the chamber by inserting 3 or 4 drops (no more) of (do-it-yourself) Charlie’s Chamber Oil into the port by cocking the gun so you have access to the exhaust port located at the breech seal. Use an eye dropper or an ear drop dropper. (Does that sound right? Anyhow, you know what I mean). Then stand the rifle on its butt plate for a several minutes to let it weep into the chamber. You may want to rotate it a couple of time for better distribution. If possible, depending on the gun,  move the cocking arm back and forth several times to slide the piston up and down to lube the walls  Then insert a pellet and discharge the gun. Then stand it on the butt plate again for a couple of hours and let the seal absorb the remaining lube. Again, move the cocking arm back and forth several times to slide the piston up and down to lube the walls a little, then insert a pellet and shoot it. It may smoke a little at first few  but will settle down.

Do it and tell us
 :p  :p

[jct842]

will try your chamber lube............spring is brand new macari........less than 20 shots.   john