1989 gt 150 crankcase seal

[sundaydrive86]

Rebuilding johnson gt150. What type of gasket sealant is used for the crankcase? Book recommends a gel seal? Can I run to local hardware store for gasket maker or do I need to run to a dealer? Thanks for the help!!

 

[SparkieBoat]

I like the black oil resistant stuff from your local store for that situation. I never did like that gel seal, I got a tube of it, just does not seem to do as well to me.

 

[sundaydrive86]

Thank you!

 

[Faztbullet]

No you don't want to use silicon as it will blow out!!!!!! Use the gelseal or Loctite 518 and the primer...you can get it at auto parts store..

 

[emdsapmgr]

The red gel seal works fine and has been recommended by the factory for years. I'd be using two+ tubes on a V6.

 

[racerone]

This is a precision joint !!!----Use only the factory " gel seal " or loctite 518 sealer.------The surfaces must be absolutely clean and free of bumps /. old sealer / imperfections that will prevent a metal to metal joint.-----All you need to use is a 1/16" diameter bead of sealer. . ----Most of the sealer should squeeze out to get the metal to metal fit.----The metal to metal fit is important to get the proper clamp-up on the bearings !!!----Failure to take proper care in this operation can have disastrous results.

 

[SparkieBoat]

better listen to these guys, they know their stuff, my experience is limited with this, but I have not had mine blow out. the gel just did not seem to work well for me, it seemed to get pressed out of the joint. but I would stick to OMC recommendations.

 

[racerone]

The " gelseal " is supposed to sqeeze out of the joint to get the metal to metal fit.------And gelseal is a " low filler " sealing material in order to be able to do that.---I have measured the thickness of sealer on some failed rebuilds and it was 0.008" thick. so no wonder they failed.

 

[SparkieBoat]

gotcha..i thought it was not sealing good because it got pressed out.. I stand corrected. thanks guys

 

[sundaydrive86]

Thanks again. I will rundown the gel seal!