Caille Neptune Gas Tank Repair?

[joecb]

Looking really good there Buc (-:
About the vent tube. Was there a tube in the old tank? If so did you copy the arrangement? I’m can’t remember how I did mine. But thinking about it now I have an idea as to how it should / could be .
The way you have it now, if you tip the motor forward gas will leak from the tube. Now if you were to extend the tube to the back far corner of the tank, no matter which way the tank was tipped it wouldn’t leak.
Yep’ , I just checked mine, as near that I can feel in side the tank , I did run the tube back to the corner. Now if you need 1/8 ” copper tube… auto parts store ask for an oil pressure gage kit.

Joe

[Buccaneer]

joecb wrote:

Looking really good there Buc (-:
About the vent tube. Was there a tube in the old tank? If so did you copy the arrangement? I’m can’t remember how I did mine. But thinking about it now I have an idea as to how it should / could be .
The way you have it now, if you tip the motor forward gas will leak from the tube. Now if you were to extend the tube to the back far corner of the tank, no matter which way the tank was tipped it wouldn’t leak.
Yep’ , I just checked mine, as near that I can feel in side the tank , I did run the tube back to the corner. Now if you need 1/8 ” copper tube… auto parts store ask for an oil pressure gage kit.

Joe

Joe, I’ll have to admit, I did not think about gas coming out the vent tube,
other than when it was running, hence I made it stick up about 3/4″
above the tank, figuring those old single bangers do a whole lot of shaking!

The original vent tube on the inside of the tank was bent toward the back
of the tank, maybe 5/8″, pretty much like what I did.

After the fact, I’m thinking the vent tube sticking up 1/8″ above the top of
the tank was per factory. My 3/4″ tall tube “may” work, but it has to be
up inside of the flywheel to clear, and it’s “close”.

The motor does not “tilt up” very far like a modern outboard while mounted
on the stern, so the inside of the vent positioned like mine would not
mater much. However, if one lays the motor on the floor on the back of
the gas tank brackets, it might help to have the vent on the inside go
to the upper front corner of the tank.
For my use, guess I won’t worry about it…… it would almost
be sacrilegious to lay the motor on the floor after all that work anyway!

Prepare to be boarded!

[Buccaneer]

A little more progress, or perhaps regress, this afternoon.

I test fit the tank mount to the tank one more time while
on the motor. Looked okay where I had it marked, so
I drilled the holes, bolted the bracket to the tank, and
test fit it again. It’s as least, or more square to the cylinder
that the original tank…… hard to tell.

The bracket isn’t sitting down on the crankcase flange all
the way on one side, as the bottom of the tank is hitting
the top of the muffler canister bolt. Not sure if the bolt is
original on the muffler, and no idea if there were spacers
between the tank mounting bracket and the crankcase flange
originally, as the tank was not mounted when I acquired the motor.
Anyone know if there were originally spacers?
I could shave down the top of the bolt 3/32″ or so, and would probably
take care of the problem.

I have not drilled the rivet mounting holes for the trough on the bottom
of the tank yet. While I was thinking about it, I noticed on the
old tank bottom that it has a series of holes drilled in the bottom
of the tank for gas to get to the trough.
I can’t see needing as many as holes as the old tank bottom had
above the trough. Wouldn’t one hole suffice?
Kind of curious what you did here Joe.

Prepare to be boarded!

[Tom]

The original and replacement tank on my Caille RBM needed to be shimmed up.

[Buccaneer]

Tom wrote:

The original and replacement tank on my Caille RBM needed to be shimmed up.

Thanks Tom, I’m more than likely missing original spacers.
I’ll make up some brass ones about 1/8″ thick, and I should
be good to go.

Prepare to be boarded!

[The Boat House]

[joecb]

Spacers are good! …
Don’t know why all the holes? I suppose that one would be fine. But holes are easy if you have one of those handy cone shaped step drills that have one cutting edge, only way to go in sheet metal. if one doesn’t have a Greenlee punch set.

Joe B

[Buccaneer]

joecb wrote:

Spacers are good! …
Don’t know why all the holes? I suppose that one would be fine. But holes are easy if you have one of those handy cone shaped step drills that have one cutting edge, only way to go in sheet metal. if one doesn’t have a Greenlee punch set.

Joe B

Joe, sounds like I better tell Santa about those step drills.
I never would have thought they’d actually work, but
I’ve seen some guys on YouTube use them.
I have a well use and somewhat dull gasket punch set……
not sure they’d make it through the 22 gauge sheetmetal.

Will have to look up “Greenlee” punches.
Thanks!

Prepare to be boarded!

[Buccaneer]

The Boat House wrote:

Tubs, you and Joe think alike. I’m not sure how far this motor will actually
tip up, and if you tip it up at all, you need a 5/8″ wrench in the boat.
Not sure how you land the boat at a shallow landing. 🙁

Prepare to be boarded!

[The Boat House]

[Author]

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