Melted hole Oil tank

[Freshwater]

The saw was run with a loose muffler. I would like to save the saw. I see housing for this saw $75 eBay, to much for me so I'm going to try to patch it up

 

[Freshwater]

I ground off all the burnt plastic, made a metal patch and flushed the oil tank

 

[furb]

What saw is it?

 

[Freshwater]

What might work to stick the metal patch to the plastic oil tank. I have High heat RTV and JB Weld on hand

 

[Freshwater]

A co-worker gave me the saw (the guy who melted it). If I can fix it I might give it back to him.

 

[Yukon Stihl]

I would use Goop... The same as Shoe Goop,Shoe Goo,Auto Goop ect.
It holds up to acid,oil and holds better than RTV

 

[atpchas]

Any chance of securing the metal patch with small bolts or pop rivets? Then the focus could be on best sealant without concern about also holding the patch in place.

 

[Stihl99]

Wow very tricky fix you are trying. I would use thin brass, form it to the tank giving you plenty of attachment brass and attach it using closed end rivets.
Before riveting I would pre-drill the holes, put a bead of permabond epoxy around brass, then rivet it in.
4 alignment marks on the brass to tank would also help you align it easier and faster for riveting.

 

[Jasent]

I’d just jb weld it then put some aluminum tape over it to reflect heat away

 

[sawfun]

What saw is it, and maybe look on Ebay for a cheap replacement tank?

 

[Freshwater]

I do like the idea of pop rivets to hold the patch in place but not having any luck finding closed end rivets. I work at a sheet metal shop every kind of pop rivets except closed end. I also have sheet copper but no brass.

 

[Freshwater]

Its an echo, the tanks are incorporated into the body of the saw. I did see used casings on eBay $75 . Don't think its worth putting that much money into this saw

 

[scottr]

I would use Goop... The same as Shoe Goop,Shoe Goo,Auto Goop ect.
It holds up to acid,oil and holds better than RTV

The same company that developed Shoe Goo also developed Seal-All that is gas and oil resistant .

 

[Yukon Stihl]

The same company that developed Shoe Goo also developed Seal-All that is gas and oil resistant .

I find the Goop sticks to anything tenaciously and remains flexabile. I fix a lot of plastic with it and zip ties. Can’t use zip ties on this repair.

 

[JHenke]

I have made tank repairs using JB Weld High Temp.

https://www.amazon.com/J-B-Weld-829...t=&hvlocphy=9023258&hvtargid=pla-486132852917

 

[jetsam]

Regular JB melts at 600°F. Their Extreme heat product is good up to 1000° (they write 2400° on the package, but that's instantaneous heat, not a continuous operating temp).

The extreme heat stuff might be good enough for this application. Keep the muffler tight after the repair and it shouldn't get that hot.

 

[Jasent]

Do a muffler mod and it will help get the heat out as well

 

[Freshwater]

Muffler Mod might be a good idea, for such a small muffler it's quite heavy must be a lot of baffles inside.

 

[Chevboy0167]

I would get some small stainless steel mesh. Cut out a rectangle or square for the size you need. Get a cheap Amazon or Harbor Freight plastic welder iron kit. Use the iron to gently melt the mesh into the area over/around the hole. Make sure it melts about halfway down into the tank plastic. Now you have base for a fuel resistant epoxy to grab on to and hold. Apply several layers, (letting them dry between layers), to build up to match the rest of body. Let fully cure/dry for a day or two then sand/shape to your liking.

Check Youtube for vids on how this principle works. I have used this method on ATV/dirt bike plastic fenders and such along with the stainless steel staple method.

 

[Stihl99]

FW
The more I think I about this the more I am going to say it
Forget the ideas posted here and either throw it away or get a new OEM to replace it
You are messing with fire patching a plastic hole, which contains oil, positioned underneath a heat source that gets hot enough to cook food on.