RunRyder RC
 1  Topic Subscribe
WATCH
 1 page 1485 views TOPIC CLOSED
HelicopterEngines Plugs Mufflers Fuel › Tips for installing piston sleeve/liner - Align 91HP/ OS91 HZ Engine
10-25-2009 08:33 PM  8 years agoPost 1
snipealot

rrApprentice

Frederick, MD

My Posts: All  Forum  Topic

I am going nuts trying to reinstall this piston liner. Does anyone have any helpful tips?

PM  EMAIL  Attn:RR
10-25-2009 08:42 PM  8 years agoPost 2
brcg123

rrKey Veteran

Wagoner OK USA

My Posts: All  Forum  Topic

put some oil on the liner inside and out, and as you slide the liner on to the piston, rotate the sleeve a little back and forth and the ring will close and the liner will slide in easily.








Trex700N, Trex600N, Raptor70, RaptorTitan, GMPCrickett, Visa

PM  EMAIL  GALLERY  Attn:RR
10-25-2009 09:37 PM  8 years agoPost 3
itsjojo

rrKey Veteran

North East Pennnsylvania

My Posts: All  Forum  Topic

The liner should slide up and down as easily as the piston. That's the way they come. I am sure to clean the block and liner and test fit the liner to make sure it slides easily up and down in the block prior to installing the piston. As Brcg123 said you can twist the liner to compress the ring with the taper at the bottom of the liner BUT BE CAREFUL!!! Be aware you need to orient the grove in the top rim of the liner with the pin in the block top surface. Twisting to compress the ring is ok but once the ring is compressed you MUST orient the grove in liner with the pin BEFORE you slide the liner down! This is a must. The reason is that if your liner is not lined up the ring gap will expand when it enters one of the ports in the liner walls. Done right, the Ring gap must slide down the wall in an area where there is no port (hole in the side of the liner). If the ring expands in the port the deal is done! New ring,liner and maybe piston?? Here is where it is important that the liner be oiled up and slides down easily. Good luck!
Jojo

JoJo
Foreseeing My Flybarless Future!

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR
10-25-2009 09:50 PM  8 years agoPost 4
brcg123

rrKey Veteran

Wagoner OK USA

My Posts: All  Forum  Topic

The liner should slide up and down as easily as the piston. That's the way they come. I am sure to clean the block and liner and test fit the liner to make sure it slides easily up and down in the block prior to installing the piston. As Brcg123 said you can twist the liner to compress the ring with the taper at the bottom of the liner BUT BE CAREFUL!!! Be aware you need to orient the grove in the top rim of the liner with the pin in the block top surface. Twisting to compress the ring is ok but once the ring is compressed you MUST orient the grove in liner with the pin BEFORE you slide the liner down! This is a must. The reason is that if your liner is not lined up the ring gap will expand when it enters one of the ports in the liner walls. Done right, the Ring gap must slide down the wall in an area where there is no port (hole in the side of the liner). If the ring expands in the port the deal is done! New ring,liner and maybe piston?? Here is where it is important that the liner be oiled up and slides down easily. Good luck!
Jojo
Nicely put, all of this is why you mark everything you take off of the engine as you take it apart! always mark the top of the head, the top of the piston, and the liner, and the connecting rod, on the side that faces out when attached to the piston and main shaft. everything else will fall into place. Orientation means everything. This is why so many people have trouble with a rebuilt engine, they pay no attention to how things are put in the engine. once you have burned a couple of gallons through the engine, everything seats in that orientation. put one component in a different orientation when re assembling it, and it becomes difficult to get things to work right again. and things dont want to go back together. hope you have good luck with it.








Trex700N, Trex600N, Raptor70, RaptorTitan, GMPCrickett, Visa

PM  EMAIL  GALLERY  Attn:RR
10-25-2009 10:42 PM  8 years agoPost 5
snipealot

rrApprentice

Frederick, MD

My Posts: All  Forum  Topic

I pulled the engine apart because I have this motor in my Trex 700 and the engine would not start, then it got hydrolocked and I tried to start it anyway with my Align starter because I am an idiot and now seems like the motor has no compression at all. I pulled it all apart and checked for internal damage but all looks well? Put it back together and still wont start, the motor has very little compression just like if the glow plug is not in. What could it be?

PM  EMAIL  Attn:RR
10-25-2009 11:19 PM  8 years agoPost 6
GMPheli

rrElite Veteran

W. Bridgewater, MA USA

My Posts: All  Forum  Topic

R u sure the ring is not damaged some how? Or could the head gasket be leaking? The compression has to be going somewhere. Wheyou turn it over slowly by hand can you hear it leaking (hissing sound)?

PM  EMAIL  GALLERY  Attn:RR
10-26-2009 01:40 AM  8 years agoPost 7
itsjojo

rrKey Veteran

North East Pennnsylvania

My Posts: All  Forum  Topic

Nicely put, all of this is why you mark everything you take off of the engine as you take it apart! always mark the top of the head, the top of the piston, and the liner, and the connecting rod, on the side that faces out when attached to the piston and main shaft. everything else will fall into place. Orientation means everything. This is why so many people have trouble with a rebuilt engine, they pay no attention to how things are put in the engine. once you have burned a couple of gallons through the engine, everything seats in that orientation. put one component in a different orientation when re assembling it, and it becomes difficult to get things to work right again. and things dont want to go back together. hope you have good luck with it.
That was me the first time. lol

JoJo
Foreseeing My Flybarless Future!

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR
10-26-2009 02:07 AM  8 years agoPost 8
snipealot

rrApprentice

Frederick, MD

My Posts: All  Forum  Topic

R u sure the ring is not damaged some how? Or could the head gasket be leaking? The compression has to be going somewhere. Wheyou turn it over slowly by hand can you hear it leaking (hissing sound)?
I am such a newbie when it comes to Nitro, just converted over from electric...so I am not sure if the ring is damaged or not, it looks fine? No hissing, this engine has about 1.5 gallons on it...




PM  EMAIL  Attn:RR
10-26-2009 08:45 AM  8 years agoPost 9
itsjojo

rrKey Veteran

North East Pennnsylvania

My Posts: All  Forum  Topic

Snipealot
Nice photos! I love build photos. I couldn't tell if that was putting
it together or taking it appart.

Are you aware that the ring gap has a notch that goes over another pin located in the ring grouve on the side of the piston? I don't think it was mentioned here yet. This obviously keeps the ring gap from wandering and therfore sliding up and down the wall where there are no ports. Just thought I'd mention it.
jojo

JoJo
Foreseeing My Flybarless Future!

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR
WATCH
 1 page 1485 views TOPIC CLOSED
HelicopterEngines Plugs Mufflers Fuel › Tips for installing piston sleeve/liner - Align 91HP/ OS91 HZ Engine
 Print TOPIC  Make Suggestion 

 1  Topic Subscribe

Wednesday, April 25 - 11:53 am - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online