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I just purchased a Cox .049 8cc fuel tank..no venturi gasket?? Babe_b10
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I just purchased a Cox .049 8cc fuel tank..no venturi gasket?? Empty
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I just purchased a Cox .049 8cc fuel tank..no venturi gasket?? Empty I just purchased a Cox .049 8cc fuel tank..no venturi gasket??

Post  coxxoc on Fri May 11, 2012 8:23 am

Hi lads,

I just received by post a cox .049 8cc fuel tank (black plastic) and I got
tank front & back, needle valve, plastic tube & spring, reed , retainer, and a free crankcase gasket.
But there was no rubber venturi gasket?..has anyone had the same happen to them?,,,
and are these plastic tanks any good?

P.S. Is the crankcase gasket supposed to be glued on or just placed on? I checked one of
my .020 pee wee`s and it seemed that the crankcase gasket was glued or is that just
what happens to it when engine has been started and it hardens up?

Mr G Flying


Last edited by coxxoc on Fri May 11, 2012 8:30 am; edited 1 time in total
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I just purchased a Cox .049 8cc fuel tank..no venturi gasket?? Empty Re: I just purchased a Cox .049 8cc fuel tank..no venturi gasket??

Post  coxxoc on Fri May 11, 2012 8:27 am

I just purchased a Cox .049 8cc fuel tank..no venturi gasket?? 41301410I just purchased a Cox .049 8cc fuel tank..no venturi gasket?? 34245810


Last edited by coxxoc on Fri May 11, 2012 8:41 am; edited 1 time in total
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Post  coxxoc on Fri May 11, 2012 8:29 am

this is the tank i was talking about?

Mr G Flying


Last edited by coxxoc on Fri May 11, 2012 8:39 am; edited 1 time in total
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I just purchased a Cox .049 8cc fuel tank..no venturi gasket?? Empty Re: I just purchased a Cox .049 8cc fuel tank..no venturi gasket??

Post  SuperDave on Fri May 11, 2012 8:38 am

It's a needle valve spring.

A venturi gasket is not part of a tank assembly but a separate item. They need to be replaced occassionally because they do harden. If you want a more resiliant venturi gasket, slice off a small piece of silicone fuel line and make your own as I do.

They are not glued on.


Last edited by SuperDave on Fri May 11, 2012 8:41 am; edited 1 time in total
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Post  Kim on Fri May 11, 2012 8:39 am

The crankcase gaskets don't use sealant, but often bond themselves to the tank or case due to the heat and compression from tightening the case screws. They can usually be peeled away, using a little heat from a hair dryer and a razor blade. The spring in the photo goes on the needlevalve body, and can be replaced by a #4 washer and a piece of silicon fuel tubing that will help seal the needlevale against air-leaks.
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Post  coxxoc on Fri May 11, 2012 8:42 am

yeah I realized that later about the small spring

Mr G
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Post  coxxoc on Fri May 11, 2012 8:46 am

How about the plastic tube and spring, I`m having a bit of trouble trying to make it stay at the bottom of tank.
I`m going to use the engine for free flying.

Mr G Flying

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I just purchased a Cox .049 8cc fuel tank..no venturi gasket?? Empty Re: I just purchased a Cox .049 8cc fuel tank..no venturi gasket??

Post  SuperDave on Fri May 11, 2012 8:54 am

The tube is the fuel pick-up tube for the NVA. The smaller spring goes within the pick-up tubr to act as a filter.

The tube is either placed at eight o'clock or straight down depending on the type of flying done; CL = 8 o'clock; others, straigt down at 6 o'clock for others where centifugal force is not a consideration.


Last edited by SuperDave on Fri May 11, 2012 8:58 am; edited 1 time in total
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Post  Kim on Fri May 11, 2012 8:54 am

For Free Light or R/C, the pickup tube needs to go to the bottom of the tank. It has to weave it's way around the Venturi tube and tank screws. I cut mine just long enough that it catches the inside lip of the backplate, and stays there while I push the tank on the assembly.

Rusty has a video on Youtube showing the importance of the tiny fuel tube spring in using capillary action to literally help draw the fuel into the pickup tube, so it's a good idea to make sure and install it.
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Post  coxxoc on Fri May 11, 2012 8:56 am

I also received these 3 .049, .051 timimg shims and i noticed one was different...why?

Mr G confused I just purchased a Cox .049 8cc fuel tank..no venturi gasket?? 40932710
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Post  coxxoc on Fri May 11, 2012 9:00 am

Should the cut on the bottom of the plastic fuel tube be facing the back of the tank?..and
should the spring poke out a little from the bottom of tube?

Mr G
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Post  SuperDave on Fri May 11, 2012 9:01 am

Different how?

Are you sure that one isn't two shims stuck together?
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Post  Kim on Fri May 11, 2012 9:02 am

You may have a glowhead gasket mixed in with the timing shims...they look very similar. Check to see if it fits nicely into the top of the cylinder...if so, that's where it goes.
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Post  SuperDave on Fri May 11, 2012 9:06 am

G'morin Kim!
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Post  coxxoc on Fri May 11, 2012 9:08 am

No, there are 3 shims, 2 of them were together, I seperated them and they look identical but
the other one seems thinner and I could see what looked like small bluish/green stains on the copper, like when
it oxidizes or something?..like water has got to it.

Mr G
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Post  Kim on Fri May 11, 2012 9:12 am

Hey Dave ! I figure the different color IS from age or a bit of oxidation...shouldn't affect it's function...
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Post  coxxoc on Fri May 11, 2012 9:14 am

It is considerably thinner than the other 2. wouldn`t that have some effect on the compression?

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Post  coxxoc on Fri May 11, 2012 9:19 am

I`ve just found out that this item includes TWO 0.010" & ONE 0.015" to Mix/Match if Desired
it`s a new production item.

Mr G Flying
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Post  coxxoc on Fri May 11, 2012 9:23 am

But I still think the the 0.015 shim is not right, it`s too thin where it should be slightly thicker?
It must be faulty?

Mr G
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Post  Kim on Fri May 11, 2012 9:40 am

Got me...sorta out of my league...maybe some of our Engine Guys will check in shortly...
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Post  microflitedude on Fri May 11, 2012 9:43 am

Or the guy you bought them from.... I'm guessing Bernie or Matt.
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Post  SuperDave on Fri May 11, 2012 9:51 am

coxxoc wrote:I`ve just found out that this item includes TWO 0.010" & ONE 0.015" to Mix/Match if Desired
it`s a new production item.

Mr G I just purchased a Cox .049 8cc fuel tank..no venturi gasket?? 4201307885

As in so many things, "the devil is in the details". Relax.
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Post  Cox International on Fri May 11, 2012 9:58 am

In answer to the questions (some of which already have been answered):

The tank assembly includes a venturi gasket and the crankcase gasket is not "free"' it is a part you paid for.

In our case we slip the venturi gasket onto the tank's venturi post.

The crankcase gasket is not glued on.

Email us if you need a picture of how the pick-up line is attached/ laid out. The spring should be completely inserted.

Yes, the tanks are good. The aluminium ones may be better but are also more expensive.

We supply 3 timing shims; 2 each .010" and one of .015". This is so that the modeller has the following shim choices:

.010
.015
.020
.025
.035

Thus maximizing possibilities.

The .015 one was cut from a different sheet of copper that would have sported a bit of oxidation. Fully normal with copper and, no, this would not affect the operation.



Last edited by Cox International on Fri May 11, 2012 10:00 am; edited 1 time in total (Reason for editing : typo)
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Post  SuperDave on Fri May 11, 2012 10:08 am

Yea for the "Bernster" who comes through once again!


Last edited by SuperDave on Fri May 11, 2012 10:20 am; edited 1 time in total
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Post  Cox International on Fri May 11, 2012 10:11 am

If the tank assembly was bought from us and the venturi gasket is truly missing please email nichole@coxengines.ca and she will send you one.
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