OS160FT problems
 

I have a OS160FT that keeps loosing the right cylinder, I've tried changing the glow and I have the high and low end tuned. Is it possible that the rockers on that one side have gone out of adjustment?

RE: OS160FT problems
 

IF one cylinder keept quitting when you throttle down, there can be a number of reasos: bad glow plug, improperly-set valves, loose head bolts, bad piston/ring/liner fit, leaky valves, bad fuel/air distribution, and so on. The engine needs to be checked carefully. It's possible that the compression isn't quite good enough on the one cylinder because it didn't "come in" during breakin, or was somehow damaged at a previous time, or was never right from the factory. It's not possible to say for sure. The engine can only be gone over very well. Only by checking everything else, do we come to the conclusion that a new ring and liner may be needed.

RE: OS160FT problems
 

Bax, this is what I have found so far.The right glow barely glows with the on board glow. If I use my hand held driver it glows nice and bright. The left glow plug works fine, that's the side were the on board glow is grounded. I switched around the positive wire from one plug to the other and I get the same result. It's as if I'm loosing ground contact through the engine. The next problem I think I have with the right cylinder is that it's possibly not drawing fuel. I would think that since the glow plug isn't lighting the fuel that raw fuel would be pouring out the exhaust but I get nothing but air. This is the same motor and glow driver I had in my Top FLite stinson and it ran like a sewing machine, now nothing but problems.

RE: OS160FT problems
 

Normally, you would have the on-board glow driver have one lead to each plug center, and the other lead to the crankcase. You don't run the current in one plug, through the case, and out the other. The plugs should be in parallel, and glow with equal brightness when power's applied.

If the one cylinder once ran well and now doesn't, you need to see what might be wrong. If it's not drawing fuel, is the valve actually working? Did its spring break? Is the ring shot?

The enigne needs to be gone over very well.

RE: OS160FT problems
 

Bax, there are two hot wires run, one to each glow plug. There is one ground wire attached to the left side of the motor mount. It seems the ground is not paaing from the left side of the to the right plug. I found the gasket on the right intake manifold is sucking air. The motor has been shipped to Hobby Services for a check up.