I keep hearing people say Dirko is fuel resistant - it’s not..

[Vintage Engine Repairs]

There is this myth going around where people say Dirko is fuel resistant and that somehow is some special silicone. It’s really not. It’s bog standard acetic cure silicone at an inflated price. Not fuel safe / fuel resistant by any stretch. Had a contact speak to Elring in Germany who confirmed this too. It’s good like many other silicones are good, but it’s nothing special.

 

[frank_]

you wont beat car windscreen bonding sealer for solvent resistance

 

[Wow]

you wont beat car windscreen bonding sealer for solvent resistance

Thanks Frank,, That's good to know..What will seal a leaking carb bowl when you can't find the exact gasket to replace it..?

 

[frank_]

Thanks Frank,, That's good to know..What will seal a leaking carb bowl when you can't find the exact gasket to replace it..?

i use a universal set of O rings on round bowls, and overstretch one onto something if they are too thick/too small, then wait for it to shrink down a bit
for non round bowls you could use the screen sealer and let the skin tack off before fitting

 

[RobertTX]

i use a universal set of O rings on round bowls, and overstretch one onto something if they are too thick/too small, then wait for it to shrink down a bit
for non round bowls you could use the screen sealer and let the skin tack off before fitting

Good old fashioned Permatex No. 2 is gasoline resistant.

 

[a. palmer jr.]

Dirko is good enough for Stihl...that's what they use..

 

[rupedoggy]

There must be different types of Dirko. That is the wrong one for fuel resistance.

 

[Chevboy0167]

PDF...

https://www.elring.com/fileadmin/Da...sen/Dirko_HT_rot/Dirko_HT_Rot_TDB_2020_EN.pdf

 

[Chevboy0167]

No different types... None meet fuel resistant criteria. Now, the anerobic surface sealer is.

https://www.elring.com/en/products/sealing-compounds/

 

[bwalker]

There is this myth going around where people say Dirko is fuel resistant and that somehow is some special silicone. It’s really not. It’s bog standard acetic cure silicone at an inflated price. Not fuel safe / fuel resistant by any stretch. Had a contact speak to Elring in Germany who confirmed this too. It’s good like many other silicones are good, but it’s nothing special.

I've been saying that for years.
Using silicone on anything that has contact with petroleum products isn't a great idea.

 

[bwalker]

you wont beat car windscreen bonding sealer for solvent resistance

Honda weatherstrip adhesive is the way to fly.

 

[link]

I have used gasket silicone on several occasions and had no problems with it, but when I look at the tube it does say "oil resistant".
However when I search for "gasket sealer" or "gasket cement" they all seem to be fuel resistant.

 

[Canyon Angler]

 

[Chevboy0167]

Hmmmmm.... right on!

https://www.permatex.com/products/g...tion-form-a-gasket-no-3-sealant-liquid-16-oz/

 

[Chevboy0167]

Another Permatex option...
https://www.permatex.com/products/g...esistant-gasket-dressing-flange-sealant-2-oz/

 

[a. palmer jr.]

I've used that Permatex Aviation sealer in the past and it is good stuff..

 

[Canyon Angler]

I've used that Permatex Aviation sealer in the past and it is good stuff..

One caveat I should have mentioned: You don't want to use it with gasohol, for those who run gasohol in their saws. Isopropyl alcohol is what you remove it with, and I don't think it's resistant to ethanol, either. But it's fine with any kind of petroleum, anti-freeze, seawater, motor oil, ATF, etc. Service temp is -65 to 400°F continuous.

 

[bwalker]

I have used gasket silicone on several occasions and had no problems with it, but when I look at the tube it does say "oil resistant".
However when I search for "gasket sealer" or "gasket cement" they all seem to be fuel resistant.

I've never seen a silicone product that is fuel resistant. And not from lack of looking.
If your looking for a product for base gasket deleting Loctite 510 is the best product you can use.

 

[Chevboy0167]

If ya feel like being spendy...

https://www.ebay.com/itm/282608238607?hash=item41ccc3800f:g:yFAAAOSwZrhhJNCO
https://www.ebay.com/itm/185226927828?hash=item2b20629ed4:g:BUgAAOSweEphuoq5

 

[link]

I've never seen a silicone product that is fuel resistant. And not from lack of looking.
If your looking for a product for base gasket deleting Loctite 510 is the best product you can use.

Hehe... I looked it up, the price gave me a really good and healthy laugh