Re: Die-cast Crank Case on a stunt tank... issue

WingingIt74 Sat Jan 26, 2013 1:00 pm

I've already ran the tank on another engine with no problems.

I'm all out of ideas...

I even put a spring on it to help start, since my finger was sore... only thing it did was take the pink paint off quicker.

WingingIt74 Sat Jan 26, 2013 1:05 pm

I also used anywhere from 1-6 head gaskets... no change.

Last night when it did run for a few short spurts, it was a good runner, but the needle valve had no effect on it. It's got to have a leak somewhere.

**Admin** Sat Jan 26, 2013 1:18 pm

Did you look at your case yet?

Die-cast Crank Case on a stunt tank... issue - Page 2 -2011

Die-cast Crank Case on a stunt tank... issue - Page 2 -2111

WingingIt74 Sat Jan 26, 2013 1:19 pm

There was a little, which I easily removed with my pocket knife. Didn't change anything.

Cox International Sat Jan 26, 2013 1:29 pm

Try changing cylinder, piston, head. If that still does not work we have to concede it might be the crankcase, in which case we'll send you a replacement.

John Goddard Sat Jan 26, 2013 2:08 pm

Dunno What reed you're using Travis but after today I'm developing
A dislike of the Mylar + plakky retainer combo.
As Bernie says do the suck/blow test.
If in doubt drop a different reed in.
Very Happy

WingingIt74 Sat Jan 26, 2013 2:30 pm

I did one better. I swapped for another DC engine, wouldn't run either.

I then tried a plastic 8cc tank, should work right??? No, started pumping again....

I think I'm done with DC cases and tanks. I don't think I'll even mess with DC cases either, I'll stick to the tried and true extruded. I never had this much problems... except with peewee 020s... that's a different story...

WingingIt74 Sat Jan 26, 2013 2:31 pm

John Goddard wrote:Dunno What reed you're using Travis but after today I'm developing
A dislike of the Mylar + plakky retainer combo.
As Bernie says do the suck/blow test.
If in doubt drop a different reed in.

The stunt tank I was using an "e" clip, the plastic tank I was using the reed retainer.

Cox International Sat Jan 26, 2013 2:46 pm

Keep in mind that the DC cases were never meant to be mated to a backplate or tank not using the red reed retainer. That may well be the issue although we did sell about 30 or 40 engines with 5cc metal tanks and DC cases. Besides the first ones where fuel leaked because we were not aware that 2 CC gaskets were required, we received no further complaints.

I may build myself one of those suckers to try next weekend.

WingingIt74 Sat Jan 26, 2013 2:54 pm

I've been using a modified red reed retainer for the stunt tank. Using a Dremel is the only way to cut one down, was my 3rd attempt. Tried a razor saw and a scroll-saw first... didn't work so well.
Die-cast Crank Case on a stunt tank... issue - Page 2 Img_3316

Die-cast Crank Case on a stunt tank... issue - Page 2 Img_3316

On the black tank, been using a standard red reed retainer.

WingingIt74 Sat Jan 26, 2013 3:12 pm

coxaddicted Sat Jan 26, 2013 3:58 pm

I tried Dirko HT sealing compound on my cox engine and it doesn't leak anymore. This product is very good for any issue of sealing on engines.

Don't know if it is available all over the world but from my experience the best sealing compound which is available.

Here is a link:
http://www.louis.eu/index.php?topic=artnr_gr&artnr_gr=10004064

WingingIt74 Sat Jan 26, 2013 5:13 pm

https://www.youtube.com/watch?v=OGmhB7vRG1U

That is all I get it to do. If you pull up a larger window, you will see it pumping fuel out of the vent tube.

As-Built:
DC case - DC case gasket - DC red reed retainer - standard case gasket - plastic 8cc tank.

WingingIt74 Sat Jan 26, 2013 6:12 pm

I swapped the tank for the stock back plate, just to give it a shot. It took me a while but I did get it to run for about 60 seconds... then it slowly died down to an occilate with plenty of fuel left in the tank. I just don't get it. It wouldn't start after that. I'm ready to strip it down for parts and toss the dc case.

Bernie, it's not your fault, my other plain DC case wouldn't run on the tank either.

The paper towel shows the pink powder coat coming off when I wipe it down.
Die-cast Crank Case on a stunt tank... issue - Page 2 Img_3410

Die-cast Crank Case on a stunt tank... issue - Page 2 Img_3410

WingingIt74 Sun Jan 27, 2013 11:01 am

Until I come up with a solution, I've parted it out to make this. My wife has yet to name it as she is at work.

Die-cast Crank Case on a stunt tank... issue - Page 2 Img_3411

Die-cast Crank Case on a stunt tank... issue - Page 2 Img_3411

I will continue to play with it with the other DC cased engine Brandon has.

Cox International Sun Jan 27, 2013 12:23 pm

If the pink thing does not run well with the standard backplate then the issue surely lies with either the crankcase, crank or top end as we sell tons of DC engines and they run.

The powder coating may stain a paper towel but it should not come off much... at least it has not for the pink one I run here. But then, I have only run it 4 to 5 times.

WingingIt74 Sun Jan 27, 2013 2:18 pm

Still couldn't get it to run, even with the new case, so lets have some more fun Smile

• Swapped head, cylinder & piston, added no-drag spring starter, still no go
• Swapped mylar reed for another mylar reed, did run but surges, .. now it chirps while using the spring starter
• Swap prop for Cox 6x2, less vibration, still surging
• Rotate the e-clip, runs better, not 100% yet, still chirps, won't dial in, will run fine the start to stall, adjust needle and it will come back (hunt), keeps doing this though.
• Swap Mylar reed again, still chirps, still seems to hunt
• Did the suction/blow test, seems fine. Swap head, cylinder & piston (now to go run it, stay tuned)

pkrankow Sun Jan 27, 2013 2:49 pm

Did you wash the reed seat and wipe it with something lint-free when you were in there last?

Phil

WingingIt74 Sun Jan 27, 2013 2:52 pm

pkrankow wrote:Did you wash the reed seat and wipe it with something lint-free when you were in there last?

Phil

I looked at it really closely, but other wise no. I do want to say that all these parts are new. Now off to run it again...

WingingIt74 Sun Jan 27, 2013 3:24 pm

WingingIt74 - Revised wrote:Still couldn't get it to run, even with the new case, so lets have some more fun

• Swapped head, cylinder & piston, added no-drag spring starter, still no go
• Swapped mylar reed for another mylar reed, did run but surges, .. now it chirps while using the spring starter
• Swap prop for Cox 6x2, less vibration, still surging
• Rotate the e-clip, runs better, not 100% yet, still chirps, won't dial in, will run fine the start to stall, adjust needle and it will come back (hunt), keeps doing this though.
• Swap Mylar reed again, still chirps, still seems to hunt
• Did the suction/blow test, seems fine. Swap head, cylinder & piston. At the previous setting it would not run. I kept backing it out and it started to oscillate again, I kept upping it and at 5.5 turns and it ran, I'd say about 90% which is an improvement from before with the other cylinder
• Next - Change mylar reed for stainless reed (on order, have to wait for them to come in)

Revised, see above, I kept this in this post as it may help others to trouble shoot an engine. Now that I have this engine running, lets get back to the cast engine.

Stock cast engine with back plate (not the pink one).

WingingIt74 Sun Jan 27, 2013 3:49 pm

Finally, got a DC engine to run. Started right up at 3.5 turns. Now for some tank fun...
Die-cast Crank Case on a stunt tank... issue - Page 2 Img_3412

WingingIt74 Sun Jan 27, 2013 4:41 pm

I put the 8cc plastic tank. As you can see, it's not running well, hence all the vibration. It's also pumping fuel out of the vent hole. However, it's the first time I've got one to run on a tank. When it died, the tank was not empty... still not sure why it won't run well on a tank.

WingingIt74 Sun Jan 27, 2013 5:53 pm

updated video, with the engine running on a 8cc tank.

pkrankow Sun Jan 27, 2013 6:13 pm

OK, I am going to strip another motor for the tank and give this a try with my engine on glow fuel. I hope to have a warm enough day tomorrow to try this.

8cc aluminum bee tank, not sure if I'll use a plastic or metal back.

I am just going to use an oversize paper gasket of my own make.

Phil

pkrankow Sun Jan 27, 2013 11:07 pm

Weather pending I am ready. DC Diesel bomber with a glow head, hand cut paper gasket, aluminum bee tank, metal back, aluminum pickup with tygon tube (this is going to be running diesel at some point)

I took pictures as I went, too late to upload tonight.. I'll try to get some video with a phone if it works or not. I have never tried posting video before though.

As an aside, I think someone stepped on the package in shipping, the needle was bent and part of the NVA on the back plate is cracked. If this works properly it won't matter since it will stay on this tank to pull my RC glider up.

Phil

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