1973 johnson 135hp v4 crossflow<br />I'm debating whether or not to take off the heads to inspect the cooling restrictors,rings and cylinders and replace the gasket and torque it to spec. The downside is twisting off a bolt. The boat had lived all but its last 2 years in fresh water and I suspect the heads have never been off. <br />1)Should the head bolts be backed off and retorqued on a maintainence schedule?<br />2)Should the headbolts and head gasket be replaced on a maintainence schedule? <br />3)Is there a method to avoid twisting off a bolt? I am thinking wd-40 for a week first and using a torque wrench to some max torque to loosen the bolts, and maybe rigging the wrench to apply that torque load overnight. <br /><br />I'm asking for unnecessary trouble here arent I. The other side is that I want to keep the engine servicable. Thanks for your comments
<br />9 outta 10 times, you can "feel" a bolt that's going to shear off when using a regular bar.<br />WD40,and an impact wrench set on it's lowest tourqe setting is the best way to get them out whole tho.