Carburetor Mounting Gasket

[Aatcman]

Hi,

I am looking for an answer to a very simple question, yet cant seem to find anything on it anywhere....

I have a 97 3.0lx mercruiser...

Naturally it has the mercarb 2bbl... Which I removed yesterday to clean and rebuild...

The manifold has one oval shaped hole... However, the gasket used between the carb and the manifold had two round holes...

The kit supplies two mounting gaskets -- one with two round holes and one with one oval hole (for a pic google quicksilver 27-866027).

The question is, should I use the gasket with two holes, like was done before, OR should I use the gasket with one oval hole that matches the manifold?. And why?

Thanks!

 

[gm280]

Well :welcome: aboard Aatcman to iboats. Nice to have you as a new member.

Personally I would use the oval gasket since it matches the opening. But that is just me. If there is a good reason for the two hole version, I don't see it in this application. JMHO

 

[Scott06]

Ran into the same thing on my 3.0 use the two holed gasket. I tried the oval hole and my idle mixture screw adjustment was wonky. Swapped out for the two hole and it worked fine. I think the oval is for a letter tks carb as the kit covers many years of carbs

 

[Aatcman]

So Scott06, even with the oval opening in the manifold, I should use the two hole gasket?

Should I trim the excess that just hangs over the open hole in the manifold (the stuff between the two holes)?

What do you mean by wonky? Were you not able to get a consistant idle?

Thx

 

[Mechmagcn]

Should I trim the excess that just hangs over the open hole in the manifold (the stuff between the two holes)?

Thx

That's what I did on my 3.0

 

[Scott06]

So Scott06, even with the oval opening in the manifold, I should use the two hole gasket?

Should I trim the excess that just hangs over the open hole in the manifold (the stuff between the two holes)?

What do you mean by wonky? Were you not able to get a consistant idle?

Thx

Yes even with the open hole in manifold use two hole gasket. That's what was on mine originally, that's ultimately what worked.

By wonky, when turning tgevidke mix screw, it didn't behave as normally would. Generally when properly adjusted you can turn the mix screw in or out say 1/2 to 3/4 of aturn before it really starts to stumble.there was no play one way or another in the idle adjustment mixture and was rough plus I think it was farther out than was typical for that engine. Just didn't react to idle mix adjustments like every other carb I've had.

I had taken the carb apart to clean and fix a acceleration bog. Put carb back on with what looked to make sense... the oval gasket. Bottom line didn't run right put the two hole on and it was perfect.... and my big was gone