Cylinder head bolt torque

[rjhtuner]

I have a 1988 6hp Johnson wanting to know the torque specs for the cylinder head bolts? and if it requires sealant?

 

[timguy]

No sealant and tighten little by little with a bit of anti seize on the threads but not enough anti seize to smudge over to the gasket surfaces. Can't tell you torque, maybe the other guys will know. I use my experience only.....when assembling any bolts into aluminum......especially 3/8 inch and smaller.

 

[Boobie]

144-168 inch-pds. Install dry.

 

[timguy]

That's tighten to snug, then one more full turn? No....just kidding. Thanks, Boobie.

 

[rjhtuner]

Thank you! So install gasket dry???

 

[vics]

Thank you! So install gasket dry???

You might find the manual at

www dot boatinfo dot no/lib/evinrude/manuals/1971-1989johnsonevinrude.html#/0
useful

 

[timguy]

Yes, install dry. Make sure the cylinder head surface is clean and flat. I surface them with 220 to 280 grit wet or dry 3M or high quality paper. Set paper down on a very flat surface.....like an old countertop, tile, or similar......flat and hard. Provide a lubricant like WD40, mixed gas, fuel oil, or soapy water. Work an even and consistent motion until all the head surface has been contacted.....then finish with a figure 8 motion. This will insure a nice finish and flat sealing surface. Sometimes I block finish the cylinder block, especially if the powerhead/block is off and undergoing a complete overhaul. It can be difficult to block finish the cylinder block when it is still bolted to the rest of the lower housing.