HW 45 Silver Star Dieseling Issue.

[Blackrider]

Picked up a very nice S/H .177 Silver Star yesterday but it is dieseling quite a bit. I'm told this is common with the pistol but is it, and does it need some attention ?
The opened barrelled pistol does not appear to be clogged with grease and looks in very good order !
I have not interferred with the gun internally.
This is with RWS Hobby's by the way !

Thanks.

[gingernut]

Mine owned from new doesn't.
Has somebody given it some oil?

[OzzieM]

Shoot the pistol at half cock until it dries out.
OzzieM

[Blackrider]

Maybe, how easy/hard are they to strip down ?

[harvey_s]

They all do that sir...

Well my two did.

The later model .177 one was the worst and dieseled like a bastard even when run almost dry!

[TonyL]

They all do that sir...

Indeed they do!

Love that smell!

[TonyL]

Maybe, how easy/hard are they to strip down ?

Someone once posted a link to a strip down guide, John.

Not sure if there's one on the WOC?

I've not stripped one. Maybe not ever so easy, but do-able if you take your time, if I remember correctly.

If you do a search on here, I think you'll find some informative posts on stripping and different guide layouts / lubrication advice.

[airgunnut]

Are you lubing the pellets? For years my 45 was dieseling, it only stopped when I ran out of pellets at the club and some one gave me some, the only difference was he didn't lube the pellets

[airgunnut]

Someone once posted a link to a strip down guide, John.

http://my.tbaytel.net/coopers/HW45Review/review.html
The strip down of my 45
http://planetairgun.com/index.php?topic=7256.0

[Mark A]

I have owned 2 HW45 pistols, a standard one about 10 years ago and a Blackstar more recently. They both dieseled quite badly. A lot of people say it'll stop after a tin or two of pellets, but it still dieseled for me after 2 tins. It also seems to be fine for a bit then after a long break it'll start again.

I stripped mine, wiped away all the grease, although to be honest there wasn't nearly as much as I was expecting for all the smoke. I then sprayed a dry moly into the compression chamber, polished the piston body a little and sprayed some on that, plus a smear of moly grease on the rear 1/4 of the piston. I added a 0.5mm ptfe piston liner so that the grease on the spring doesn't end up flicking into the compression chamber. Also gave the spring ends a quick polish.

The difference was very noticeable. less recoil and I could actually get some fairly decent groups rested (still need to work on my aim unrested). I did notice that the cocking wasn't quite as smooth, so i dabbed a bit of extra moly into the cocking slot and that sorted it out.

http://i29.photobucket.com/albums/c2...psur7xnps3.jpg

http://i29.photobucket.com/albums/c2...pswkpwygo3.jpg

http://i29.photobucket.com/albums/c2...psnsoju8ke.jpg

A couple of pics of the piston liner. Or you can just press the side arrows on the first pic as the album should be public.

[Rickenbacker]

The rock-hard plastic piston seal is famous for letting lube past, to create detonation.

Method to reshape the seal is to dry fire the thing a couple of times. Incredible, but see here: http://www.pyramydair.com/blog/2007/...45-air-pistol/

I'm sure Jon Bud put a thread up recently, when he'd changed the factory seal for one of those soft self-lubricating replacment seals from Australia.
Fleabay item number:151837758222
JB was very pleased with it.

RE stripping the '45 - it's a pain in the ass. And if you don't happen to have concave ended pin punches for the main convex headed pins - you're going to leave tool marks on the pins. And possibly mark the pistol's frame if you're not very careful / lucky.

HTHY John.

[Blackrider]

Are you lubing the pellets? For years my 45 was dieseling, it only stopped when I ran out of pellets at the club and some one gave me some, the only difference was he didn't lube the pellets

Not "lubing" pellets !

[Blackrider]

http://my.tbaytel.net/coopers/HW45Review/review.html
The strip down of my 45
http://planetairgun.com/index.php?topic=7256.0

Many thanks for this !

[Blackrider]

I have owned 2 HW45 pistols, a standard one about 10 years ago and a Blackstar more recently. They both dieseled quite badly. A lot of people say it'll stop after a tin or two of pellets, but it still dieseled for me after 2 tins. It also seems to be fine for a bit then after a long break it'll start again.

I stripped mine, wiped away all the grease, although to be honest there wasn't nearly as much as I was expecting for all the smoke. I then sprayed a dry moly into the compression chamber, polished the piston body a little and sprayed some on that, plus a smear of moly grease on the rear 1/4 of the piston. I added a 0.5mm ptfe piston liner so that the grease on the spring doesn't end up flicking into the compression chamber. Also gave the spring ends a quick polish.

The difference was very noticeable. less recoil and I could actually get some fairly decent groups rested (still need to work on my aim unrested). I did notice that the cocking wasn't quite as smooth, so i dabbed a bit of extra moly into the cocking slot and that sorted it out.

http://i29.photobucket.com/albums/c2...psur7xnps3.jpg

http://i29.photobucket.com/albums/c2...pswkpwygo3.jpg

http://i29.photobucket.com/albums/c2...psnsoju8ke.jpg

A couple of pics of the piston liner. Or you can just press the side arrows on the first pic as the album should be public.

Brilliant stuff, many thanks !

[Blackrider]

The rock-hard plastic piston seal is famous for letting lube past, to create detonation.

Method to reshape the seal is to dry fire the thing a couple of times. Incredible, but see here: http://www.pyramydair.com/blog/2007/...45-air-pistol/

I'm sure Jon Bud put a thread up recently, when he'd changed the factory seal for one of those soft self-lubricating replacment seals from Australia.
Fleabay item number:151837758222
JB was very pleased with it.

RE stripping the '45 - it's a pain in the ass. And if you don't happen to have concave ended pin punches for the main convex headed pins - you're going to leave tool marks on the pins. And possibly mark the pistol's frame if you're not very careful / lucky.

HTHY John.

Cheers Phil, I suspected the piston seal would be somehow to blame.
Dont think I'll strip it myself but but I'll take a good look at all info you Guys have posted as it may give me an idea on whats going on !
I was going to bring it down to the Bash but it needs a new breech seal which I've ordered so I wont use it until that arrives !

See you tomorrow and Tone !

John.