Need advice on backplate pressure tap for 160FX  
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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Engine Manufacturers Direct Support Forum >> O.S. Engines Support >> Need advice on backplate pressure tap for 160FX
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Need advice on backplate pressure tap for 160FX - 3/4/2007 1:38:29 AM   
Flyboy1958



Posts: 516
Joined: 10/20/2002
From: Somewhere, USA
Status: offline 		I have an OS 160FX and plan to put a perry VP30 pump on it. I have read and been told to just drill out the upper left hole in the back plate where one of the screws thread in and you can just replace the screw with a pressure nipple. Can anyone give me advice on this technique? I am not sure I want to do this. Can I just buy a backplate from a fuel injected 160 and use that? It seems it might be safer for me and easier.
       Post #: 1

RE: Need advice on backplate pressure tap for 160FX - 3/4/2007 4:33:44 AM   
krayzc-RCU



Posts: 6414
Joined: 3/26/2002
From: Kannapolis, NC, USA
Status: online 		i did two OS-160 and i drilled and tap the center of the plate w/o any issues

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smooth as silk!

(in reply to Flyboy1958)
       Post #: 2

RE: Need advice on backplate pressure tap for 160FX - 3/4/2007 5:13:09 AM   
alan0899


 

Posts: 2045
Joined: 4/17/2006
From: Cundletown, NSW, AUSTRALIA
Status: offline 		G'day Mate,
Have you flown the 160FX without the pump?
Mine runs perfect without pumps or regulators, but they do take a while to run in.
Also, don't under prop it, use at least a 16x10, or a 17x10, not a 18x6, that pitch is too fine, remember they are flat out at 10,000 RPM.

_____________________________

Good Flyin Mate. Keep Thyne Airspeed up, lest the ground arise & smite thee, Allan.

(in reply to Flyboy1958)
       Post #: 3

RE: Need advice on backplate pressure tap for 160FX - 3/4/2007 9:34:36 PM   
Flyboy1958



Posts: 516
Joined: 10/20/2002
From: Somewhere, USA
Status: offline 		I am using the pump because I plan to put the tank on the CG. It's quite a bit aft of the usual spot. I am going to use an APC 18x6W because I plan to do some 3-D stuff and I have read where a lot of guys like that prop with this engine. My concern is if I drill out the upper left hole, what is the best way to do it, and how do I keep the shavings from getting into the engine? I don't want to mess up the threads either for the pressure tap.

(in reply to alan0899)
       Post #: 4

RE: Need advice on backplate pressure tap for 160FX - 3/5/2007 4:59:25 PM   
Bax


 

Posts: 12834
Joined: 4/26/2002
From: Champaign, IL, USA
Status: offline 		The O.S. Max 1.60 FX-FI uses the upper-left-hand mounting bolt hole to pressurize the fuel tank. You would use a drill bit that's smaller than the bolt hole, and carefully drill through and into the crankcase. You replace the bolt with a pressure tap. That's the best way if you desire to add a pump to a regular 1.60 FX engine.

You can't avoid getting small metal bits when you drill into the case. You really want to disassemble the engine and remove the bearings before you drill. Then wash out any metal that results from drilling.

_____________________________

Bill Baxter, Manager Hobby Services/Futaba Service/North America
3002 N. Apollo Dr. Ste. 1 Champaign, IL 61822 USA
Service Phone: 217 398-0007
Email: hobbyservices@hobbico.com

(in reply to Flyboy1958)
       Post #: 5

RE: Need advice on backplate pressure tap for 160FX - 3/6/2007 2:16:57 PM   
Flyboy1958



Posts: 516
Joined: 10/20/2002
From: Somewhere, USA
Status: offline 		Thanks Bax, You would know. I'm glad you replyed to my post, now I feel Im am about to do the right thing anyway. I do concider myself machanically inclined ane have taken my O.S. 46 FX apart a couple of times, but is there anything special I need to know about taking my 1.60 FX apart? How about the bearings, do I need a puller or anything?

(in reply to Bax)
       Post #: 6

RE: Need advice on backplate pressure tap for 160FX - 3/6/2007 4:31:58 PM   
Bax


 

Posts: 12834
Joined: 4/26/2002
From: Champaign, IL, USA
Status: offline 		To remove bearings, you just need heat. After you completely disassemble the engine so that you have only the case with bearings, heat it to about 250 degrees F. The bearings should just fall out when you knock the case on a block of wood. Reheat the case, slide in the new (unheated) bearings, and then immediately install the crank, drive washer, and a propeller. This will draw the bearings into position in proper alignment.

_____________________________

Bill Baxter, Manager Hobby Services/Futaba Service/North America
3002 N. Apollo Dr. Ste. 1 Champaign, IL 61822 USA
Service Phone: 217 398-0007
Email: hobbyservices@hobbico.com

(in reply to Flyboy1958)
       Post #: 7

RE: Need advice on backplate pressure tap for 160FX - 3/6/2007 8:19:10 PM   
Rocketman_



Posts: 803
Joined: 10/15/2003
From: , MA, USA
Status: offline
quote:

ORIGINAL: Flyboy1958
is there anything special I need to know about taking my 1.60 FX apart? How about the bearings, do I need a puller or anything?

You may want to read the following web pages before disassembling your engine. There are more details in those pages than anyone of us is likely to type here.

Bearing Replacement - OS 1.60
http://www.rcaerobats.net/BearingChanging.htm

Working with the OS 140 or 160 Engine
http://members.cox.net/don.ramsey/OS%20Engines.ht

I've gotten away with drilling the crankcases of three OS 1.60's the lazy way, that is, without disassembling the engines. I know it is risky but I just decided to take the chance (not recommended). I mount the engine in the hole in the drill press table using it's propeller shaft and securing it with the prop nut and washer. Am I crude or what? I'm in a hurry. Then I stuff the crankcase full of oily paper towels or foam. After drilling I search for metal chips with a magnifying glass, a light and a Q-tip. And yes, I did find a couple tiny chips.
Over the years I've seen engines survive broken glow plug elements and ground up bearing parts so I said to my self, hmm, I'll bet if I miss a couple of small aluminum chips they won't hurt much. Is that rationalization?

(in reply to Flyboy1958)
       Post #: 8

RE: Need advice on backplate pressure tap for 160FX - 5/15/2007 1:07:13 AM   
Gungadin


 

Posts: 194
Joined: 2/19/2006
From: Madison, OH, USA
Status: offline 		Bax--Speaking of bearing replacement for the 160FX, I would like to replace the stock bearing with a better, longer life bearing than what comes in the engine from the factory. Any specific brand, types (shielded vs non-shielded). Thanks

(in reply to Rocketman_)
       Post #: 9

RE: Need advice on backplate pressure tap for 160FX - 5/15/2007 4:27:05 PM   
Bax


 

Posts: 12834
Joined: 4/26/2002
From: Champaign, IL, USA
Status: offline 		We only use stock O.S. replacements. We have no experience with other types of bearings.

_____________________________

Bill Baxter, Manager Hobby Services/Futaba Service/North America
3002 N. Apollo Dr. Ste. 1 Champaign, IL 61822 USA
Service Phone: 217 398-0007
Email: hobbyservices@hobbico.com

(in reply to Gungadin)
       Post #: 10

RE: Need advice on backplate pressure tap for 160FX - 5/15/2007 11:03:19 PM   
Gungadin


 

Posts: 194
Joined: 2/19/2006
From: Madison, OH, USA
Status: offline 		Bax--OK then, nevermind. Problem is your genuine OS bearings for the 160 don't last as long as a higher quality bearing does. You probably are aware that after 9 or 10 gallons of fuel are run thru this engine many folks have bearing failures. But on a more positive note I like the two I have had experience with. But I will replace the bearings right out of the box before break-in with better quality ones when I purchase my next new 160 soon. Thanks

(in reply to Bax)
       Post #: 11

RE: Need advice on backplate pressure tap for 160FX - 5/16/2007 4:05:15 PM   
Bax


 

Posts: 12834
Joined: 4/26/2002
From: Champaign, IL, USA
Status: offline 		Almost all bearing failures we've seen have been the result of corrosion to the bearings. The balls get a bit rough from corrosion and then start to erode the races. They don't roll smoothly and can then cause metal fatigue to the ball retainers. Eventually the bearing fails. Corrosion isn't a result of how the bearings are made. Fuels with little castor content tend to encourage corrosion. Use of little or no after-run products also encourages corrosion.

In our service center, we've found that many users of model engines just don't spend the time needed to properly care for their engines. They run them and then put them away. Other than crash damage, the vast majority of engines we see have damage that could easily have been prevented by changes in how the engines are run and taken care of.

_____________________________

Bill Baxter, Manager Hobby Services/Futaba Service/North America
3002 N. Apollo Dr. Ste. 1 Champaign, IL 61822 USA
Service Phone: 217 398-0007
Email: hobbyservices@hobbico.com

(in reply to Gungadin)
       Post #: 12

RE: Need advice on backplate pressure tap for 160FX - 5/16/2007 11:08:25 PM   
Gungadin


 

Posts: 194
Joined: 2/19/2006
From: Madison, OH, USA
Status: offline 		Bax--Your a good guy and I pretty much agree with everything you said, except there are guys like me who know how putting an engine away with fuel in it will corrode (rust) the bearings, and take great care to run the engine dry and then give it a liberal dose of anti-rust after run oil each and every time we fly it, and still see the retainers come apart after extended use. I'm not picking on OS. I remember years back when we used to purchase a certain model of Super Tigre engine and found out that the stock bearings would only be good for 2-3 gallons of fuel run thru them before the little brass tabs on the retainers would fatigue and come off and damage the engine. So we would take our brand new never run engines and replace the bearings out of the box with a bearing that had a riveted type retainer and never had anymore bearing failures. I believe OS has a similar situation with the 160 and I know there are some very savvy guys out there with lots of experience running OS 160's that agree with me. But I suppose my point is mute because I doubt that OS is going to change their policy. At least we know the fix for the problem and can enjoy the otherwise fine characteristics of the 160. I have respect for you and think you do a fine job so please don't take my comments as an attack on your ability or integrity. People I know who have dealt with you agree that your a good guy, so keep up the good work.

(in reply to Bax)
       Post #: 13

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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Engine Manufacturers Direct Support Forum >> O.S. Engines Support >> Need advice on backplate pressure tap for 160FX
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