1969 Merc 200 20HP: Maybe a stupid question but I see a very small gap between the exhaust and the lower unit. This isn't supposed to be there, right? The guy I bought the motor from took me through, step-by-step, the process of changing the impeller. I don't know if it was there before or not but there was some water when I drained the the gear lube. I'm afraid that this gap (which appears to have a little gear lube leaking, maybe) will end up causing the water pump to go bad and all would have been done for nothing. If this gap should be closed, can I use a gas/ oil resistant sealant?
