Welding Cast Boat Exhaust Manifold Crack

Welding Cast Inboard Outboard Exhaust Manifold Crack Repair with 3/32” 7018 low hydrogen stick weld rod. Have all of your tools, weld rod, welding hood, etc all set out and ready for this process, once you start you do not want to stop until the part is ready to cool in the insulation. Find the ends of the crack with heat, drill each end of the crack to prevent further cracking, grind the crack to a v bevel, preheat, weld keeping heat on as much as possible in the piece, after welding is complete, go right into a post heat to relieve some of the stress incorporated in the welding process, a quick inspection, and then the part needs to go directly into the insulation.

[@GuestInvitado-gd3bi]

Great job. I have trouble welding cast iron. Thanks for the tips.👍👍

[@HRIservicesllcSturgeonBay]

Thanks I have several videos on cast , the thin cast like this manifold can be very difficult, some times not possible as the stress from the weld cooling cracks it again.

[@randeepdosanjh9767]

Thankyou very much I like video

[@HRIservicesllcSturgeonBay]

Your welcome, thanks for watching!

[@kevtech733]

Best to not use E7018 on cast iron. For Tig Silicon Bronze on DC Negative or Aluminum bronze to fix cast on AC.
E7018 will crack eventually.
If you don't have a tig set up you can get Nirode for stick welding.

[@1detroitryder]

so how do you know in this situation that the insides aren't compromised ? what if it leaks inside the exhaust ports

[@lifeasithappens4479]

Can I do the same thing with my intake manifold?

[@anthonypalasota870]

Do you have to remove the exhaust maniflod ? I can get to mine on the engine

[@paulym5814]

Couldn’t you just braze that crack with bronze ?

[@lar1664]

Try torch welding with cast iron bare rod and flux. Best repair hands down,and it can be machined down to bare metal. More expensive process but anything would really do the trick as long as the piece don't crack too soon. Best method is known as thermal spray torch process. Spray the casting with molten powder nside a furnace to build it back up to the surface. Same procedure preheat and post heat. 7018 is probe to cracking, really any mild steel rod for that matter to cast. Nickels better but more expensive. I like the gas welding old school method bare iron rod and flux.

[@toddmarasse1157]

What is recommended pre/post heat?

[@HRIservicesllcSturgeonBay]

350-450 degrees F

[@tonyt8807]

why did it crack?

[@HRIservicesllcSturgeonBay]

Not sure.

[@NjJfjr]

ALFRED J VALAITIS
VALAITIS MOTOR SERV SOUTH PHILADELPHIA PA
TAUGHT ME THIS TECHNIQUE back in the early 90's ..
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I APPROVE THIS MESSAGE 🙌
Nj'sJfJr 👍🏼💪🏼❤️🇺🇸