Hi All,

I hope there might be an OS58 owner out there! I've just acquired one of these second hand and need help getting it apart for cleaning. I have the head and backplate off, also the cylinder liner is out. I cannot however, get the piston/rod assy out of the case.

The case is two piece with the lower case being a casting and the finned barrel being turned. How is the barrel fitted to the lower case? Pressed in or threaded? I am pretty sure they must be able to be separated from each other as otherwise, there's no way the rod/piston assy can be removed?

Can anyone help?

While I'm at it, does anyone have an old "Jetstream" type muffler they'd be prepared to part with?

Thanks in advance to all,

DerFly

http://www.osengines.com/history/osm...5-max-58rc.jpg

I'm not familiar with this motor but alot of times there is build up on the wrist pin not allowing the rod to slide back and forth, some types of carburator spray cleaner have been useful getting the gunk off the wrist pin it takes some amount off repeated application and working the rod back and forth to get the rod completely free on the pin witch should on most engines allow you to get the rod off the crank.


gary

Hi DerFly, I recently restored two of the .50's which are exactly the same as the .58 except for internal displacement.

The finned cylinder simply sits on the lower case on a paper gasket. It is not screwed in. It is the gasket that has "glued" the two parts together due to heat and castor oil. You will more than likely destroy the paper gasket when separating the two parts of the case. No big deal, I replaced mine with thin automotive gasket material.

Be very, very careful with the front bearing!!! It is most certainly a roller pin bearing of unusual dimensions: 13mm ID x 18mm OD. You will not be able to find a replacement from places like Boca or RC Bearings.

Here is my thread with photos of one of my restorations:

http://www.rcuniverse.com/forum/m_61...tm.htm#6166814

My .50's are fantastic runners. I have one in my Senior Falcon. I'm sure the .58 is only more powerful.

I have an extra prop drive if you need it. It, too, is an "oddball" part that is difficult to track down.

David

David,

Many thanks for the information and warnings. It's exactly what I needed to know.

I'll post pictures when I'm done.

DerFly

BTW, does the 50 have a two ring piston also?

you can teach an old dog new tricks


gary

My .50's have single conventional rings. BTW, Frank Bowman can supply you with any rings you will ever need. I have purchased several from him. The man is one of those rare and true treasures in our hobby; a first rate product at an amazing price. He lists the .58 as being in stock:

Frank Bowman

1211 N Allen Ave. Farmington, N.M. 87401-3568

505-327-0696

ringmaster46 - at - msn.com

Reproduction Model Engine Rings

Quality at a fair honest price. Making a good ring is a Skill. Making a fine ring is an Art!

Last Revised 09-14 -07

I will reproduce nearly any model engine ring. If not available, I'll need a good piston and cylinder to measure, or send motor. Send return postage, insurance is extra. For orders outside of USA, ask for shipping costs? Priority postage is extra. An order of 10 rings or more, discount of $1.00 off per ring, mixed orders are fine! Ring cost & shipping charges for USA listed below.

Standard ring up to .65 engines: $9.00 ea.(1) shipped $13.00, (2) shipped $22.00

Standard ring from .66 & up: $10.00 ea.(1) shipped $14.00,(2) shipped $24.00

Dykes ring up to .65 engine: $10.00 ea.(1) shipped $14.00,(2) shipped $24.00

Dykes ring from .66 & up: $11.00 ea.(1) shipped $15.00,(2) shipped $26.00


** I also make special rings to order, ask for prices.**

Ace Twin .64

Aircom M61 (pin)

Anderson Spitfire .65

Air-O .45

Asp .52 4C, .61

Atomic

Atwood .49, .51, .63

Avistar .60 (pin)

Bantam .16

Bat .19

Brison 2.4 (pin),3.2 (pin)

Brown Jr. .60 cylinder sizes vary (send Piston & cylinder for proper fit & correct ring)

Brownie .29

Bunch .45, .49

Cameron .15, .19

Cave Cobra

Cleveland Tom Thumb .45

Como .29 (pin), .40, .51 (pin), .90 (pin)

Contestor D.60

Cub Cadet 25CC (pin)

DL 50 CC (pin)

Dooling .29, .61, Yellow Jacket

Echo 16CC (pin), 21CC (pin), 23.6 (pin), 24.4 (pin), 30CC (pin)

Edco Sky Devil .64 Old or New (RJL) state which one?

Enya 3.5 (pin), .30 SS (pin),.35 X (pin), .40 X Dykes (pin), .40 Dykes model 6002, .45, .45SS (pin), .46 4C,.49 X (pin),50SS (pin), .53 4/C, .60 4C, .60 X (pin), .60 standard, .80 X (pin), .80 4C, .90 4C, 120 R 4C, 1.55 4C, 240 4C Twin

ETA .29

Forster .29, .31, .88, .99

Fox .40 Sch., .45, .50, .59 .047 thick ring only, .59 long shaft Ign., .60 Blue Head, .60 Eagle, Fox Hawk

Red Head .60 (pin), .74, .78, 120 Twin (pin)

GMS .61 (pin), .76 Dykes (pin)

Hassad Blue Streak .64

HB .21 Dykes, .40 PDP Dykes, .50 Dykes, .61 (pin), .61 Dykes

Hiller (Car)

Homelite 25CC, 30CC (pin) old .060 thick (top to bottom measurement),New model 30CC (pin)½ way into ring groove from land, 30CC .030 thick, 33CC (pin), 38CC (pin), 40.6Super EZ Chain Saw(pin),45CC (pin), 50CC (pin)

Horner 3.7 Twin (pin)

Hornet .19, .60

Howler .60 (pin)

HP .21 4/C Dykes ,.40 (pin) ,.61 R.I. Silver Star (pin), .61 Dykes (pin) Blk Case Gold Hd.

Irvine .40 Pylon Dykes & Standard, .61 Dykes,.25 Dykes.

Kavan MK 50

KDC Kioritz 21.2 CC (pin), 23.6, 25 CC (pin), 30 CC (pin),58 CC (pin)

K&B .35 Dykes, .40 Dykes, .40 S Dykes (pin), .61, .61 Dykes (Lee Custom), 1.35 (pin), 1.5 (pin)

Kometa .29

Kraft .61 (pin)

Kratmo 10 CC,4A Ignition

Lewis 60

Magnum .53 XL 4C, .61 XL (pin), .91 XL 4C

Maloney 100 (pin), 125 (pin)

McCoy .09, .19, .19 Dykes B.H., .21 Dykes Car, .29 all versions, .29 Dykes B.H., .35 Dykes B.H., .36, .40 Dykes B.H., .49, .55, .60

McCulloch 21 CC (pin),25 CC (pin) MDB 90 Leaf Blower, 28 CC,32CC (pin)

MDS .78 (pin),1.48 (pin),2.18 (pin)

Merco .40, .49, .49 Dykes, .50, .61, .61 Dykes

Moki M .51 (pin), .61 (pin), 1.35 (pin), 1.50 (pin), 1.80 (pin), 2.10 (pin)

O&R Industrial Motor 1 HP

OPS Maxi .30 (pin)

OS .20 FS 4C, .26 4C, .28 FH Dykes (pin), .32 (pin), .37 H (pin),.40 H Dykes & Standard, .40 H (P) Pylon, .40 FS 4C, .40 SR (pin), .807 bore, .40 FSR 835 Bore, .40SR Dykes, .45 (pin), .45 Dykes (pin),

45 RSR Dykes, .46 Dykes (pin), .46FX (pin), .46SF (pin), .48 Surpass, Max 50 old, .50 FSR Dykes (pin) ,.50 H (pin), .50 SX & SXH (pin), Surpass .52 4C, .58, Max-H .60 FGR .60 4C, .60FSR (pin) .9445 Bore - older or SF.9055 Bore, .61 FS 4C, .61 SX & SXH (pin), .65 (pin), .70 & .75 Surpass, .80 H,.80 Dykes (pin), .90 & .91 4C, .90 & .91 Glow, .91 FX (pin), .91 SX H (pin), 1.08 (pin), 120 4C, 120 AX(pin),160 FX (pin), BGX-1 3500 (pin)

Poulan 42C C (pin), 46 CC (pin), 60CC (pin)

Profi .40 (pin), .61 (pin), .76 (pin)

Quadra 50 (pin)

RSC 1.40 (pin)

Ross .60 Dykes (pin), .60 opposed twin Dykes (pin), .61 (pin)

Rossi Speed .60 old, .60 (pin) .021, .61 (pin) .023, .65 (pin) .0235

Ryobi 26 mm Bore EJ 100 (pin), 31CC (pin) older .064 thick, 31 CC (pin) newer .047 thick

Saito .40 4C, FA .45 4C, FA .50 4C, FA .60 T 4C Twin, FA .65 4C, 72 4/C, FA 80, .91 4C,100 4C, 120 4C,130 TD 4C Twin, 150 4C, 300 4C Twin

Sachs 2.0 (pin)

Scott Thunderbird

Skil chainsaw (pin)

Sky Chief .53

Spe 25.4 (pin), 40CC (pin),45CC (pin)

Stihl 25.4 (pin), Super 45 (pin),028,029 44CC (pin)

Super Tigre .19, X.25, S .29 (pin), G21.29 old, .34 (pin), .40 Bullring, S.40 (pin), G21.40 std., G21 .40 Dykes, G21.46 std.,S.45 (pin), V.45, G21 46 wide Dykes, .46 Bullring, G.46, G .46 Bullring, V 51, G51 (pin) Italian, G51(pin) China, V.56, V.56 Dykes, V 60 light case .044 or .047 top to bottom measurement, G24 60 Old, G 60 Bluehead, X60 (pin), V.60 wide & narrow Dykes, S.61 (pin), G.71, S.75 (pin),G.75 (pin) New China .90 (pin), 2000 (pin), 2300 (pin), 2500 (pin), 3000 (pin) Italian, 3000 (pin) China, 3250 (pin), 4500 (pin)

Syncro B-30, Syncro ACE, Syncro ACE Special

Tartan 1.34 (pin), Twin .77 (pin)

Technipower 7 Cylinder radial

Thunder Tiger .39 (pin), Pro .50 H (pin), .54 4C, .91 FS 4C, 120 Pro (pin)

Ueda .45, .61

Vltavan 2.5, 5CC

Veco .50 Dykes, .61, .61 Dykes

Vega 10CC

Webra .35 (pin), 6.5 (pin), .40, .40 (pin), .40 Dykes (pin), .50 Dykes (pin),10CCM, .61, .61 (pin),

Speed .61 FS (pin), Speed .61 F Dykes (pin), T480 4C, .91 (pin), .120 Dykes (pin),120 Std. L.S.(pin), T 4.90

Weedeater (pin) 1.380 Bore, 22 CC (pin)

Weedwacker (pin)

Westbury Atom III

YS .61 Long Stroke (pin), .63 4/C, .80 H (pin) 2C, F.91 AC 4C, .91 2C (pin), F120 4C

YW 24CC single & 48CC Twin (pin)

Zenoah G20 Pin,G23 (pin),G26 (pin), G38 (pin), G62 (pin)