By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by Allendale Oct 22nd

Piston Packing

All Topics | Latest Posts

Search for:  in Thread Title in  
Peter Maloney27/02/2019 21:08:17
28 forum posts
12 photos

Hi Guys

How much interference should there be between graphite piston packing and a bore dia of 1.5in? Somewhere I read that 1/32nd in should be ok but it seems a bit excessive when lining up with the bore. I see that Julian Atkins suggests soaking in steam oil to make things easier. When fitted should the piston be moveable with hand pressure?



norm norton28/02/2019 10:09:00
94 forum posts
5 photos

Hello Peter

The packing needs to just standing a 'bit' proud, but it will be all over the place with high spots and hollows. Once it is in the bore it should even itself out. Yes you want to be able to 'just' pull and push the piston gripping the piston rod. It will be tight so oil it.

Make a conical adapter (5-10 deg internal taper) that you feed the piston and packing into, then line that up with the cylinder bore to easily slide in. The inside bore of the adapter exit should be the same as the cylinder bore. The taper helps squeeze it all into shape.


Peter Maloney28/02/2019 19:05:19
28 forum posts
12 photos

Hi Norm

Thanks for your help. Have reduced the interference and am about to make an adaptor if I can find a suitable sized piece of scrap.


All Topics | Latest Posts

Please login to post a reply.

Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

Latest Forum Posts
Support Our Partners
TRANSWAVE Converters
Meridenne Boat 2019
Eccentric July 5 2018
Eccentric Engineering
Allendale Electronics
Subscription Offer

Latest "For Sale" Ads
Latest "Wanted" Ads
Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues

Social Media online

'Like' us on Facebook
Follow us on Facebook

Follow us on Twitter
 Twitter Logo

Pin us on Pinterest