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- Newsgroups: rec.models.rc
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!rpi!gatech!concert!rock!taco!rcb
- From: rcb@ncsu.edu (Randy Buckland)
- Subject: Engine problems
- Message-ID: <rcb.725903957@news.ncsu.edu>
- Sender: news@ncsu.edu (USENET News System)
- Organization: North Carolina State University
- Date: Fri, 1 Jan 1993 15:59:17 GMT
- Lines: 40
-
- I am currently having engine problems with a repaired Fox 40. The engine
- was crashed in such a way that it destroyed the carburator and
- sucked a lot of grit into it. I have replaced the carburator and cleaned
- the engine out and installed it in a new plane. The problem is that I can't
- get it to run for more than about 2 seconds. If I squirt fuel into the air
- intake, the engine will start but does not appear to draw any fuel from the
- line and just stops after a couple seconds. The lines are clear since with
- everything dry, I can blow into the muffler line and hear air coming out
- in the carburator. The following are the possible causes I can decide for it.
-
- 1. The model is built in such a fashion that the tank is fairly low relative
- to the engine. The engine is side mounted with the fuel intake on top and
- the intake is level with the top of the tank. Also, the plane is a tail
- dragger and that places the tank lower than the engine when on the ground.
- I can't get the tank any higher or the engine any lower, do I need a pump?
-
- 2. The piston and liner got scratched in the crash by the grit and when I
- squirt WD40 into the cylinder and turn the prop, I get a little escaping
- gas as the piston approaches the top. As I loosing so much compression that
- the crankcase suction that is supposed to draw fuel in is failing? How can
- I test this and what is the solution?
-
- 3. I have set the needle valves according to the Fox literature but am
- uncertain if they are right. Can someone with a properly adjusted
- Fox .40 BB engine measure the amount of exposed thread on both needles
- so I can check my setting? also, does the end of you high speed needle
- have a bit of metal sticking off of one end or is the end of the needle
- flat?
-
- 4. Is there any parts on the crankshaft directly below the carburator
- that help the fuel draw that might have been damaged in the crash?
- If so, how do you remove the bearings and crankshaft to check this?
- When I cleaned the engine, I could not find a decent way to remove
- these parts without major force being applied.
-
- Any other ideas? or is it time to buy a new engine?
- --
- Randy Buckland "It's hard to work
- North Carolina State University in a group when you're
- randy_buckland@ncsu.edu (919) 515-5491 omnipotent" -- Q
-