Diana 27 - Part 8
by B.B. Pelletier
Today, we'll revisit our old friend for the part many of you have been waiting for--look inside! This will be a disassembly day, with a description of what to do and how it goes. Before I start, I'm going to gather several plastic Ziplock bags of different sizes to keep all the parts in.
Step 1: remove the stock
Three screws hold the action in the stock. Two at the end of the forearm and the front triggerguard screw are all that have to be removed and the metal comes out. Once out, I began to see the history of this gun. It appears to be virgin--never having been out of the stock before. The insides will tell more.
There are two crosspins that hold the trigger parts in the spring tube. The trigger parts hold in the mainspring under tension. The back pin is hidden under the sheet metal end cap; once it's off, you see the pin. But that pin isn't holding anything, because it falls out on its own. Only the front pin is under tension.
Step 2: into the mainspring compressor
The barreled action now goes into the mainspring compressor. Since the 27 is a short rifle, the compressor had to be adjusted for it. When setting up to work on a Diana 27, know that the factory mainspring doesn't have a lot of precompression. So it will only back out a couple inches when the compressor takes off the tension.
Step 3: relax the tension and remove the trigger parts and the mainspring
With a Diana 27, you want to relax the spring tension slowly because nothing is held together inside. It all stays together because it's inside the spring tube, and you're now taking it out. Be especially careful of the strong trigger spring that is between the dark inner trigger tube and the large silver outer tube.
Keep all the parts in plastic bags so they don't get lost.
Step 4: time to remove the barrel
The barrel has to come off to free the cocking link from the piston. When I removed it, there were obvious indications that this rifle had never been apart. Lots of rust in hard-to-clean places and lots of gritty dirt was coming off.
Step 5: remove the piston
The piston slides out easily. If you don't remove the trigger, you have to pull it like you're firing the gun to clear the piston as it comes out.
And that's the sequence of disassembly of the Diana 27. Believe me, it goes together easily too, if you can remember what you did when taking it apart. These photos should guide you.
Cleaning is the next step, and this is a filthy air rifle. There are some dark spots that almost look like moly applied 15 years ago, but nothing else is consistent with that. I'll continue to observe and see what I find as I clean the gun. I won't blog that job, but I'll talk about it in the assembly report next time.