1978 johnson 115hp seahorse

[joe goryl]

I will be replacing a head gasket and water jacket gasket.Do both sets of bolts require a torque? What is the required torque? JOE

 

[joe goryl]

Re: 1978 johnson 115hp seahorse

I will be replacing a head gasket and water jacket gasket.Do both sets of bolts require a torque? What is the required torque?

 

[Gary H NC]

Re: 1978 johnson 115hp seahorse

There is a specific torque setting for head bolts and probably is for the water jacket housing.I don't have my Johnson manual with me but i'm sure someone will respond.
Head bolts need to be tightened in the correct order also.

 

[joe goryl]

Re: 1978 johnson 115hp seahorse

There is a specific torque setting for head bolts and probably is for the water jacket housing.I don't have my Johnson manual with me but i'm sure someone will respond.
Head bolts need to be tightened in the correct order also.

Thanks, I have the order of tightening. Will wait for others to reply about torque requirement. joe

 

[joe goryl]

Re: 1978 johnson 115hp seahorse

thanks

 

[joe goryl]

Re: 1978 johnson 115hp seahorse

thanks Gary

 

[rdcinmn]

Re: 1978 johnson 115hp seahorse

The manual says,
1973-1985 V4

Upper 10-12ft.-lb.
Lower 8-10ft.-lb.

water jacket housing- do you mean the cover for the thermostats? If so than 60-80in.-lb.

 

[joe goryl]

Re: 1978 johnson 115hp seahorse

thanks.JOE

 

[ezeke]

Re: 1978 johnson 115hp seahorse

See 1978 Service Manual, part 406519 , page 2-5.

Cylinder head bolt torque: 18-20 Ft. Lbs.

and

Retorque cylinder head torque to 18-20 Ft Lbs. (24-27 N-m) after motor test.

 

[joe goryl]

Re: 1978 johnson 115hp seahorse

I also received a reply that stated 10-12 ft.lb.on upper bolts and 8-10 ft. lb. on lower bolts. what do you think? Joe

 

[joe goryl]

Re: 1978 johnson 115hp seahorse

I received a reply that stated 18-20 ft.lb. on all bolts. what do you think?

 

[ezeke]

Re: 1978 johnson 115hp seahorse

Those upper and lower values given are crankcase, not cylinder head. They are not the cylinder head values for the other 1973 through 1985 motors either.

And, BTW, there is no factory manual that covers 1973-1985 OMC V4.

 

[joe goryl]

Re: 1978 johnson 115hp seahorse

Spoken as a commander.I will accept your answer and appreciate your help and quick reply.Joe