Re: Rodbolt , What is the deal with my yamaha head gasket
helo<br /> I usually use OMC gasket sealer or perfect seal.<br /> if your heads are flat and no visible machine marks then look carefully at the block surfaces. if the aluminium around the cyl liner is gone it will never seal. I have also seen some engines actually corrode a hole into the crankcase area at the v. if you suspect a leak the use shop air at 90 psi and apply air and listen for anyleakage into the cooling system. to do that you will need to make a metal tool to hold the flywheel. I made one that fits in place of the lifting strap. do not try to hold it with a breaker bar. when it spins it will come around and whack your head
. I usually submerge the gearcase and use duct tape to seal the exhaust ports. if it does not blow bubbles it may not be a cyl head gasket leak. . have you taken a fine flat file and checked to see if the block deck is true? have you carefully inspected the exhaust divider plate for pinhoiles?<br /> when you did the overhaul did you remove the divider plate or shotcut the procedure ? water can enter the cyl from the intake side, the ex ports as well as a leaking head gasket.<br /> good luck and keep posting
