1987 mercury 40 hp 402, 2 cylinder, water line plugged inside block

Ronwanda

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Joined
Jun 1, 2015
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3
Help, finally found out water line connected to tell tale coming from the block is plugged. Removed line and Block is plugged at this part, i have C L R soaking in the motor. I put it in at the thermostat housing after plugging the water tube. Hoping this will loosen it. Been soaking now for 12 hours. Is there any thing i can do to clear this or do i have to open motor??
 
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