Linkert bowl

[white1j0]

I'm getting a leak around the crush washer and the bowl gasket on my M-74B carb. how tight should the bowl nut be, I don't want to strip the threads on the carb, I keep tweaking it a little at a time but it's still leaking, any suggestions?, Thanks Whitey

[Cotten]

Whitey!

If a fresh rolled-copper crushwasher doesn't seal with only a normal "grunt" with a handwrench, then closer inspection of the sealing surfaces is required.

Occasionally the top of the nut is blemished, but more often it is the bottom of the bowl.
After the top gasket surface is dressed, the bottom surface can be lathe-cut perfectly square,

BOWLLIP.jpg

minimizing the need for "grunt".

Rolled copper crushwashers should never be re-used but a time or two, as it can change the geometry of the support and manifold as it thins.

....Cotten

[white1j0]

The bowl nut and crush washer and gasket are new

[Cotten]

Whitey!

That certainly narrows it down, doesn't it.

Get out a magnifying glass, and inspect the bottom lip of the bowl for blemishes, or indications of it contacty un-squarely.

There is also the issue of erosion that pops up often:

BOWLEROD.jpg

Since economical and skilled TIGmeisters are getting scarce in my region, I often rely upon an extra wide PEEK washer band-aid.

...Cotten

[George Greer]

Cotten,

I have a chance to get various diameters of leftover PEEK rod. Is that Peek 450? Or 450G that you use?

Here is a example of what I can get here at home:

http://www.ebay.de/itm/PEEK-Rundstab-20 ... 3a8114d628" onclick="window.open(this.href);return false;

Thanks for the advice, and sorry no intent to hijack this thread.

George

[Cotten]

Yes, George,

I save every scrap.
It is my nature.
Turnings are even saved for packing material; Here is a $3000 dog bed:

FREEPEEK.jpg

Without a translator, I cannot grasp much of your link, but Stateside, it is most convenient from http://mscdirect.com/ (when their site is up!)
Folks should be sitting down when they price 2" OD for manifold seals.

My cores are widely stepped and erratic, and most are ~4" long.

"450" and "450G" are unfamiliar to me, but I suspect the "G" stands for glass-filled.
I have always used "natural". Beware that some suppliers have provided me with substandard stock that was "marblely". Occasionally I am spammed by unfamilar suppliers from mainland Asia.

....Cotten