Need new revalve gaskets and replace carb

[capslock118]

Hi there,

I had the mechanic take a look at my engine today as it's running at 3k @ idle.

He told me that I need "revalve" gaskets replaced and to check the revalves because air is leaking through from them.

He also stated I needed to rebuild my carb.

All the work he stated would be a days job for at least $1k.

Now, I had major work done last spring, I had the swivel pin replaced, by another mechanic and they tuned up the engine and never mentioned these things.

I am having the boat looked at by the other mechanic as a second opinion, something doesnt seem right to me. Maybe I am just biased to mechanics who also has a sales floor. I don't understand why the carb would need to be replaced and I never heard of a revalve gasket before.

So, to you folks:
what's a revalve gasket and revalve line? What do they do? Are they DIY projects or something a mechanic must do for me i.e. does the engine have to come off the boat to fix it, major parts removed to fix it etc.

Similar questions about the carb: the carb seems like a DIY job to me. what are your thoughts?

Also: what are the conditions with these parts that lend to 3k idle RPM?

thanks.

 

[capslock118]

Re: Need new REED valve gaskets and replace carb

Re: Need new REED valve gaskets and replace carb

ah-HA...


I mis-heard the mechanic...a REED valve, not revalve...

so it looks like the reed valves are not part of the carburetor, but right after them prior to the combustion chamber.

If I am taking apart the carburetor anyways, then it seams to me like the reed valves would not be a hard fix.

Question, when one says a carburetor needs to be rebuilt..this just means new gaskets and fittings? surely the entire assembly would need to be put together all new...

 

[j_martin]

Re: Need new REED valve gaskets and replace carb

Re: Need new REED valve gaskets and replace carb

ah-HA...


I mis-heard the mechanic...a REED valve, not revalve...

so it looks like the reed valves are not part of the carburetor, but right after them prior to the combustion chamber.

If I am taking apart the carburetor anyways, then it seams to me like the reed valves would not be a hard fix.

Question, when one says a carburetor needs to be rebuilt..this just means new gaskets and fittings? surely the entire assembly would need to be put together all new...

BEFORE YOU GET YOUR SHORTS ALL IN A KNOT!!!!!

An air leak may cause a lean/fast idle condition. When it's idling fast on the muffs, spray a light mist of water around the base of the carbs and any other gasket places that would allow air into the crankcase. It may be just a 2 dollar gasket or tightening bolts for a repair. It could also be more serious like a crankshaft seal.

Also, if the bleed lines, from the reed valves to wherever (you didn't tell us what engine we're discussing) are leaking, they may cause rough or fast idle.

If you're willing to pay attention at least enough to get the nomenclature right, you might be able to psyche out the problem by yourself. We're here to help.

BTW, the best, fastest education is easily obtained from the manufacturer's maintenance manual.

hope it helps
John

 

[capslock118]

Re: Need new revalve gaskets and replace carb

you didn't tell us what engine we're discussing

My bad, it's in my sig so I didnt think about putting this in.

It's a 1990 Mercury 135hp V6 2-stroke outboard

If you're willing to pay attention at least enough to get the nomenclature right, you might be able to psyche out the problem by yourself. We're here to help.

BTW, the best, fastest education is easily obtained from the manufacturer's maintenance manual.

I am currently reading up in my seloc book and i have the oem service manual in the mail from another fix I am looking to do. I've read a lot of good basics on the carbs and reed from the seloc book.

When it's idling fast on the muffs, spray a light mist of water around the base of the carbs and any other gasket places that would allow air into the crankcase. It may be just a 2 dollar gasket or tightening bolts for a repair. It could also be more serious like a crankshaft seal.

And what would I expect from spraying a mist of water around the carbs, to check for air bubbles? I am assuming I would not to avoid spraying water into the carbs inadvertently.

Also, if the bleed lines, from the reed valves to wherever ... are leaking, they may cause rough or fast idle.

unfortunately I do not know because the mechanic was too busy trying to finalize a sale on a boat, so all he told me was air was leaking but not other information. I tried to pry information but he didnt seem to have the time to tell me exactly what he seen. So, i'll have to check it myself.