1981 Evinrude 75hp Head Gasket Replacement (sealant or no sealant?) + Tq specs

1981EldoCraft

Recruit
Joined
Apr 12, 2021
Messages
2
Head gasket cracked and blown, all three cylinders; strangely enough, all port side middle. Compression revealed top 125, middle 30, bottom 125. OEM gasket says no sealant, SELOC says use sealant, which is correct? Fresh water motor, water jackets are clear, is this normal to have cracking/blown HG all on one side?
Need to find torque specs for install of Sierra HG.
 

racerone

Supreme Mariner
Joined
Dec 28, 2013
Messages
38,879
The cylinder head on your motor is warped !-----Everyone I have looked at has been.----The nature of an aluminum casting and time.----No need for sealant if factory gasket is used.----Surfaces must be very clean.----Torque to 240 INCH LBS in 3 stages from center working out.----Normal ?-----Very few folks today have the time to do a torque check on bolts or visit a shop.----If you turn the key and the motor starts ( all is OK ) then you just roar off into the sunset.
 

1981EldoCraft

Recruit
Joined
Apr 12, 2021
Messages
2
The cylinder head on your motor is warped !-----Everyone I have looked at has been.----The nature of an aluminum casting and time.----No need for sealant if factory gasket is used.----Surfaces must be very clean.----Torque to 240 INCH LBS in 3 stages from center working out.----Normal ?-----Very few folks today have the time to do a torque check on bolts or visit a shop.----If you turn the key and the motor starts ( all is OK ) then you just roar off into the sunset.
Thanks racerone, good info.
 
Top