Well, nothing seems to work.  I discussed O rings between the sealplate and
the housing with a mechanical designer at work. He did not think it would
work.  The holes drilled in the top are on a V edge which complicates the
sealing.  Those holes should be on a flat section.  Even then an O ring is
not the optimum solution.  I will try again with a different combination and
report back.  What is the disadvantage of just sealing off where the tubes
are with JB weld?  Even if you test it with air, after a couple of runs on
the motor it could leak.  Alternative engines are not a great confidence
builder don't want to worry about leaks too.
Joe Berki
Limo EZ

Take it apart and take some more pictures.
I'll see what I can come up with.

One way is sand off some of the anodize on the inner cover
and weld on a short section of 2 inch .065 wall alloy
tube. Do away with the thick inner flange.

Then connect the two with hose and hose clamps.

That way you can use the stock 1/4-20 bolts.
and the stock seal plate set up.

Paul Lamar


The story continues as I have tried numerous combinations to get the seal
plates sealed.

I am attempting another try as I am writing this.  I have no idea where it
is leaking.  I re designed the bracket to the slide throttle so I could
incorporate an O ring seal from the tube to the slide throttle.

It seems that the soap bubble method does not always give an indication of
leakage but the pressure gauge indicates drop in pressure.

The latest attempt involved removal of the RTV and JB weld from the outside
after the seal plate was removed and spraying the silicone conformal coat on
first.  I need to get a fresh tube of red RTV to rule out that the stuff I
was using was bad.  I did manage to coat the inside between the screw holes
and the tube with JB weld but did not fill the entire cavity.

I keep you posted

Joe Berki
Limo EZ

I don't see any rubber inner tubes on those side pressure test plates.
Are you sure the leak is not there? Don't use bolts to hold
them on. Use large C clamps. The bolts are just another place
to have leaks. Also use 1/2 inch thick plate. That looks like
3/8th. Not stiff enough for 50 psi.

I think you need to start over.
Don't use the same bolts and spacers to hold down the sealing
block for the slide throttle flange. Use different bolts
taped into the sealing plate if necessary or do as I suggest
and weld the inner cover of the slide throttle to short aluminum tubes
and use hose and hose clamps to connect the slide throttle to the
engine.

The silicone conformal coating is for the threads on the 1/4 28
bolts only. JB Weld will not stick to aluminum unless the
conversion kit is used and the instructions are followed
closely.

Don't try to get creative here. These details are important. I spent
months developing this process.

Paul Lamar