Johnson 90 Hp 1988 Carb Rebuild

[BallisticRenegade]

I purchased a Sierra Carb Rebuild Kit 18-7046

I have everything cleaned up. Pulled all the Jets and Orifece and cleaned them. I am ready for reassembly. None of the gaskets that came with the rebuild kit seem to go any where. I figured the Gasket plug o-ring (leading to the main jet) would get a replacement in the kit but there is only 1 of them this size in each kit. The o-ring to the idol jet is non existent on my model as it uses a lead shot plug. None of the items are labeled on the website or in the instructions.

They include 8 rings or round seals in this kit and the only one I can see that I will use is the Needle and seat gasket.

Does this sound correct?

Question #2
The book calls for a core plug adhesive but the kit instructions make no mention of this.

Question #3
Is there a recommended way to seal the new gaskets? nothing is mentioned about this however I have always finger tipped a bit of oil on a gasket to help with the seal in the past.

 

[w2much]

Re: Johnson 90 Hp 1988 Carb Rebuild

That kit as with many will fit about 10 different engines. You will often find you only use a few parts from the kits for your specific rebuild. Follow your OEM manual instructions, toss the extra parts they do not fit your application. I have not used a core plug adhesive and they have worked well.Always wondered about it though.Oil or light grease on the gaskets is fine. You should not need a sealant . Be certain your surfaces are flat and clean.

 

[BallisticRenegade]

Re: Johnson 90 Hp 1988 Carb Rebuild

Thanks for the info w2much. it is nice to have a back up opinion to my own. I have another question however

I have a leak at the 90 deg connector going into the bowl on the top carb. While removing this carb the 90 deg connector came out while I was removing the fuel line. It did not look like the plastic was broken so I figured it was designed to be removed. is there a way to seal this connector to the bowl? Thanks for the help

 

[BallisticRenegade]

Re: Johnson 90 Hp 1988 Carb Rebuild

I used some Marine Epoxy and put the 90 back in. It is holding with no issues for now. it was fuel proof and plastic safe. Way better than $110 for a new float tray.

 

[emdsapmgr]

Re: Johnson 90 Hp 1988 Carb Rebuild

If you remove the rounded core plugs on the inside of the carb, you should reinstall the new ones with a sealant called Gasoila. That's what the factory put on them when originally assembled. This will make sure that no air gets ingested into the internal fuel passages and that it does not run lean. Most of the time the carbs can be cleaned internally without removal of those core plugs by using a Gumout type aerosol product.

 

[BallisticRenegade]

Re: Johnson 90 Hp 1988 Carb Rebuild

Thanks for all the help guys I have just gotten back from my first run with the rebuilt carbs and it must have worked because the top speed was screaming fast. WOOO HOOO! time for some fishing and boating fun.