Epoxy type to use in water jacket

[Cruisin97]

Need to fill hole in water jacket.
Hole created by drill bit passing through cylinder head bolt hole (at an angle) into water jacket.
Idea would be to coat bolt threads with substance to which epoxy will NOT bond.
Then screw bolt into cylinder head hole.
Then pack appropriate epoxy from water jacket side of hole to plug it.
What is appropriate epoxy to use in water jacket area --- and what to use on bolt threading that will allow me to screw bolt into place but non bond to epoxy?

 

[tphoyt]

It may not last forever but use JB Weld and coat the threads with wax.
If the bolt does get stuck gently heat it until it lets go.
Best of luck

 

[tphoyt]

Forgot to mention after you take the bolt out chase the threads with a tap so they are fresh and clean threads.

 

[matt167]

JB Weld is machinable, meaning you can tap it if you need to

 

[oldboat1]

I'm a fan of West System, but don't know if it's available in small sized containers. Wrap the bolt in plastic wrap. When the epoxy partially sets up, screw in the bolt then let the epoxy fully set. Back out the bolt, pull out large pieces of plastic wrap and you are good to go.

 

[tphoyt]

I don’t think the West System would hold up to the heat. It would get to soft.

 

[oldboat1]

Needs to fully cure. Probably 120-130F after curing. Best to compare specs with a product like MarineTex.

 

[Chris1956]

Marine-Tex is a good product. I have never used JB weld.
Your fix sounds like it will work with most any epoxy. Make sure the water jacket area is sanded with fine paper and wiped with acetone, before applying epoxy. Fill the hole and overlap the hole with as much thickness as you dare, as aluminum oxide/corrosion can cause the epoxy to fall off. If you use anything on the bolt threads, use it sparingly, as I presume you want a waterproof repair.

 

[Faztbullet]

Best to use aluminum Devcon epoxy.

 

[pointblank1000]

They make a jb weld MARINE that might work better.

 

[oldboat1]

I'm not a deciple of West System, particularly since there are now many good competitive products available now. But West used to market aluminum powder that was to be used as a thickener when working with aluminum. I'll guess the filler would increase heat resistance as well as tensile strength. (I have the powder as well as jars of various sawdust types for working on boat hulls.) I've successfully used the aluminum filler for repairing and fairing outboard lower units, including damaged anti ventilation plates. A particularly curious additive to me is the West graphite powder that leaves a repair slippery to touch, and would presumably greatly reduce friction between treated parts.

 

[Cruisin97]

My assessment:
Devcon Aluminum Putty: Best technical attributes of products mentioned BUT not available in small quantity. It's too expensive for my particular application.
Marine-Tex Grey Putty: Good fit with possible exception temp tolerance. Rated only for 250F (constant & in dry environment --- with spikes up to 300F).
WaterWeld Putty or MarineWeld Putty (J-B Weld family): Product site lists WaterWeld heat tolerance of 300F --- no published MarineWeld heat tolerance. Customer service could not resolve.
*** Key Question: How much heat tolerance is advisable for repair of 2-stroke water jacket? ****

​

 

[Huebillionaire]

Need to fill hole in water jacket.
Hole created by drill bit passing through cylinder head bolt hole (at an angle) into water jacket.
Idea would be to coat bolt threads with substance to which epoxy will NOT bond.
Then screw bolt into cylinder head hole.
Then pack appropriate epoxy from water jacket side of hole to plug it.
What is appropriate epoxy to use in water jacket area --- and what to use on bolt threading that will allow me to screw bolt into place but non bond to epoxy?

Best thing you can use is 3M 1751.

https://www.3mcanada.ca/3M/en_CA/p/d/b40066470/

 

[tphoyt]

You shouldn’t have temps much higher than you thermostats. Probably around 140. If you get over 200 then your going to have bigger problems than this.

 

[dingbat]

WD 40 works very well as a release agent with epoxies.

 

[Faztbullet]

Try

Hy-Poxy H-450 Alumbond​

 

[dingbat]

Try

Hy-Poxy H-450 Alumbond​

Interesting…. “specially formulated for HVAC copper pipes, HVAC condenser coils, tanks, valves, pumps, castings, water jackets, radiators, etc., and “where there is not constant exposures to water” in the same paragraph

 

[Chris1956]

I have seen holes in crankcases of 2 cycle outboard motors repaired with common epoxy glue. (not even putty) it worked for the life of the motor.
Heck we repaired holes in an aluminum carb bowl with epoxy glue. Worked fine as well.

I repaired my steel premix fuel tank with marine-Tex. I needed to embed some cloth into the putty so it wouldn't crack when the tank flexed.

 

[Scott Danforth]

aluminum enhanced enecon

 

[pointblank1000]

Marine jb weld
This will even hold up when submerged in gas.....i tried it and it works great.