How to clean exhaust manifold

[Popeye2]

Exhaust manifold blocked up with sooth that got hard. Beta marine D722. Can i soak it in sulphuric acid?

[atoll]

Originally Posted by Popeye2

Exhaust manifold blocked up with sooth that got hard. Beta marine D722. Can i soak it in sulphuric acid?

use domestic oven cleaner from the supermarket, works great use rubber gloves as is cuastic.
acid will cause the metal to corrode if not properly rinsed with fresh water

[Popeye2]

Thanks

[Shawn67]

I cleaned out the exhaust manifold on my MD7A by soaking it in citric acid. Took a few days to loosen up the hardened deposits. I also used a coat hanger into the passageways to help break it up.

Shawn

[travellerw]

Originally Posted by atoll

use domestic oven cleaner from the supermarket, works great use rubber gloves as is cuastic.
acid will cause the metal to corrode if not properly rinsed with fresh water

Domestic oven cleaner is mostly just Lye.

If you can find lye crystals it might work better.

[jamhass]

Google "electrolytic rust removal" Used it myself for an exhaust elbow. Safe, easy, VERY effective.

PS: put the sacrificial part (not the elbow) inside a perforated PVC pipe or similar to electrically isolate it from the inside of the elbow, and insert this into the inside of the elbow. Significantly improves the process,

[FPNC]

What you describe is very unusual for a standard Beta exhaust manifold.

If the manifold or 'elbow' is made of aluminum DO NOT soak in acid or lye or oven cleaner (which is lye). It will destroy it.

I recommend that you contact a Beta dealer or Beta directly.

[Popeye2]

Originally Posted by FPNC

What you describe is very unusual for a standard Beta exhaust manifold.

If the manifold or 'elbow' is made of aluminum DO NOT soak in acid or lye or oven cleaner (which is lye). It will destroy it.

I recommend that you contact a Beta dealer or Beta directly.

Thanks