1.8L exhaust manifold dumping water.

[B0at1n]

I have 19 AR190. The exhaust manifold is dumping water into the bilge.

it looks like a freeze plug type thing.

could someone take a picture if there’s and tell me what’s missing?

 

[tdonoughue]

I agree that looks like a freeze plug. Odd, though, that it does not show it on the parts breakout...

Don't have a little plug sitting in your bilge, do you?

 

[Bluewater272]

 

[14SX190]

^ beat me too it.
Freeze plug

 

[B0at1n]

Thanks guys. Looks like it’s what we thought it was.

how do you repair a freeze plug? Are they just pressed in? Or do you have to replace the manifold?

 

[Tyguy]

Oh, wow, never seen one just pop out like that. Weird. Every freeze plug I've seen is a press fit. Clean up the hole to remove any contaminants, press in the plug, and gently tap with something like a socket and hammer. Probably worth buying a new one from Yamaha even if you find the old one laying around in the bottom of the boat, and while making the purchase asking if they use any kind of sealant. I doubt they do but it's worth asking just in case.

 

[tdonoughue]

Usually they are pressed (or hammered) in... With a little goo on them, optimally. Might be easier to pull it to do that.

 

[tdonoughue]

Here is a pretty good writeup... Know-How Notes: How to Install Freeze Plugs ~ NAPA Know How Blog

 

[Scottintexas]

Interestingly, on my mr1 it's on the top side and further up in the air right next to another plug with a square fitting

 

[Sean R]

Are you still under warranty? I had an inspection done on the used 212S I just bought and my dealer had it done in a day. I don't think they have a lot going on right now. No new boats to prep and all the spring checkups are done. That way the manifold freeze plug is on there records.

 

[B0at1n]

Are you still under warranty? I had an inspection done on the used 212S I just bought and my dealer had it done in a day. I don't think they have a lot going on right now. No new boats to prep and all the spring checkups are done. That way the manifold freeze plug is on there records.

Well, according the dealer foreman (I have his cellphone) he said they don’t have freeze plugs and he said we should replace both manifolds if that plug popped out because likely there are cracks elsewhere.

I am out of warranty. Boat has 500 hours on it currently

I don’t show any freeze plug on the schematics. How do you know what freeze plug size to use?

 

[Sean R]

You have a 2019 Ar190 with 500 hours? I just sold my 2017 AR190 and It had 300 hrs, and I thought I was a real "Jet Boat Captain" ?

 

[14SX190]

Well, according the dealer foreman (I have his cellphone) he said they don’t have freeze plugs and he said we should replace both manifolds if that plug popped out because likely there are cracks elsewhere.

I am out of warranty. Boat has 500 hours on it currently

I don’t show any freeze plug on the schematics. How do you know what freeze plug size to use?

May need to try this temporarily

 

[Scottintexas]

@WREKS @Beachbummer @Cobra Jet Steering LLC

any idea what this plug is for ?? I would have believed emergency drain or freeze plug because on the 1.8L it's at the very bottom of the fitting but on my MR1 it's on the top side plus the plug with the square fitting ??

maybe if there is a blockage further aft in the exhaust line creating pressure this plug blows out to prevent water back flowing to the engine ??



.

 

[anmut]

Throw some JB weld on it, replace the manifold in the off season.

 

[jmargo]

You could remove the manifold and check for cracks and blockages then take it to a machine shop to see if they have a freeze plug that size. Or just take some measurements and go to a machine shop.

 

[B0at1n]

Alright so I found the plug that came out. I was able to locate a replacement plug. Its. 20mm shallow plug.

the plug went in easier than I was expecting since I was doing it blind.

ran it on the hose for about 10 mins between idle and 2500 rpms.

took it to the lake and idled from the trailer to the dock no issues. Checked before pulling away from the dock. All was dry. idled through no wake and gave it gas. Went about 300 yards and pulled off throttle to check and as soon as I looked back bilge was running and plug had popped out.

I tried to locate the plug in the bilge but haven’t been able to find it yet. I will look some more when the engine is not hot.

other than putting the plug in crooked, (possible) any other reason anyone can think this would pop back out?

 

[Neutron]

Find some high heat epoxy and thoroughly clean the area and coat the plug in place. It should be fine.

 

[B0at1n]

Find some high heat epoxy and thoroughly clean the area and coat the plug in place. It should be fine.

No concern that it can’t pop out in the future being permanently epoxied?

 

[the MfM]

Sand paper to clean the hole, brake cleaner to clean any grit and residue left behind. Indian head or permatex NON hardening sealant on the plug. Make sure to tap it in as far as possible. Give the sealant time to set.