Carb Rebuild

wallydc2

Petty Officer 2nd Class
Joined
Aug 31, 2007
Messages
103
I am in the process of rebuilding the carb on my 1991 3.0L mercruiser Alpha Gen 2. I'm stuck on the carb to manifold torque. In service manual 10 under mercarb 2 barrel the torque specifications P.(5c-1)for carb to manifold is 20lbs. Yet under installation P.(5c-9)it says 132 lbs. Which one is correct? Can I use permatex gasket maker2 with the manifold gasket?
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
71,088
Re: Carb Rebuild

Yet under installation P.(5c-9)it says 132 lbs.

Ayuh,........ That's Obviously Wrong,.......
20ft.lbs. is more like it for a 5/16" stud,+ nut.......

That equals just tighter than Snug, with a Calibrated Elbow..................;)

And,.......
A New gasket on a Clean surface shouldn't need any Glue,.....
But #2 will work Just Fine.........
 

wallydc2

Petty Officer 2nd Class
Joined
Aug 31, 2007
Messages
103
Re: Carb Rebuild

The carb kit came with 2 check balls, one's lighter than the other what does this mean? Which one do I use?
 

wallydc2

Petty Officer 2nd Class
Joined
Aug 31, 2007
Messages
103
Re: Carb Rebuild

When I took the carb apart on my 1991 3.0l merc alpha 1 Gen 2 following the manual that Don S. sent me, I immersed the venturi cluster in carb cleaner and guess what? Water was in it, It immediately seperated ( water and carb cleaner) as the venturi cluster soaked in the cleaner. The reason I brought this up is because I had read some earlier forums that said if you think that you have water in your carb, REBUILD it, cleaners will NOT remove the water. Unless there is more to it I find that this is true, I had tried everything I could think of, and I actually thought I had removed the water with chemicals ( probably did'nt help the carb either). The truth is I think carb cleaners and driers displace the water and some even say that on the can. But it is still in the carb in my case sitting in the bottom of those little copper venturi tubes. After finishing up with the carb around 3am, I took her to the lake about 11 am. You would have thought I had a new boat she ran so good, finally reached full WOT and increased speed from apprx 30 miles per hour to 37. Needless to say I was ecstatic, especially because I rebuilt it myself thanks to you guys and I saved a TON of money. The rebukd kit was on ebay for &47.00.

Thanks Don S. for the manuals and everyone else who lent a helping hand.
 
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