1997 240 Sundeck with 5.7L EFI Alpha Gen 2
I am having no progress in removing the drain screw from the lower housing to replace gear oil. The vent screw did come out reluctantly -- it had no washer seal. The lower screw is merely deforming. I have soaked it many times with penetrating oil (even overnight twice), but the slot just deforms and the screw does not move even a smidgen. Tried huge blades, rapid tapping with smaller screwdriver on the outer flanges. The screw slot just keeps deforming with no movement. It must come out. And of course I do not want to crack the cast housing body. All tips (or new cuss words) gratefully accepted.
I have already replaced the impeller. In removing the lower unit, I found much corrosion on all the bolts. Until I bought this low hours boat from an older couple, the boat had been maintained by a well known boatyard near their waterfront restricted community. It appears it has not had honest service, just quicky service. In draining the onboard gear oil reservoir, the bottom half inch was gelled dark green oil perhaps resulting in no oil feed to the lower unit. I have cleaned this out. What oil I could get from lower unit by holding it upside down is dark but I want it completely drained and flushed before refill.
Any additional tips in removing this screw without causing damage are certainly welcome.
I am having no progress in removing the drain screw from the lower housing to replace gear oil. The vent screw did come out reluctantly -- it had no washer seal. The lower screw is merely deforming. I have soaked it many times with penetrating oil (even overnight twice), but the slot just deforms and the screw does not move even a smidgen. Tried huge blades, rapid tapping with smaller screwdriver on the outer flanges. The screw slot just keeps deforming with no movement. It must come out. And of course I do not want to crack the cast housing body. All tips (or new cuss words) gratefully accepted.
I have already replaced the impeller. In removing the lower unit, I found much corrosion on all the bolts. Until I bought this low hours boat from an older couple, the boat had been maintained by a well known boatyard near their waterfront restricted community. It appears it has not had honest service, just quicky service. In draining the onboard gear oil reservoir, the bottom half inch was gelled dark green oil perhaps resulting in no oil feed to the lower unit. I have cleaned this out. What oil I could get from lower unit by holding it upside down is dark but I want it completely drained and flushed before refill.
Any additional tips in removing this screw without causing damage are certainly welcome.