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Old April 1st, 2003, 07:56 PM
y2jericho y2jericho is offline
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Default Mercury Thunderbolt 650cc 65hp 1970 has a water leak ;(

My motor is leaking water around from where the block bolts onto the shaft. It seems to me that maybe just the seal is leaking because its old and because of this water is seeping out on the side around the blocks. But at high speed this becomes a spray so the sale water is corrodoing my spark plugs ;( and possibly grounding them causing missfire...I bought another motor exactly the same without a lower unit but is unfortunately a short shaft so i can't just put the LU on and start using it.. The block in it has compression of 120-130 around all cylinders so its fairly good and plus i have all the other parts i could ever need like carbs, power packs, distributors etc.. This block currently in my motor is about 95-105 compression so it is fairly old and when it reaches about compression of 85 over the cylinders i will start putting the blcok from my newer motor onto this one.My question is.. Why does the shaft/head leak water all into my case so theres more water coming out of the case than the peehole.Currently i have gotten some epoxy glue (very heat resistant and strong) and sealed all around the block about 1-2mm thick where the seal is but it still leaks hte tiniest amount...Is there any way i can fix this without removing the block and is it a matter of the blcok being screwed or can u fix it with new seals? Because soon or later im going to have to port the other block onto this one and i know the other one doesn't leak but any precautions should i take? I heard also it might be corrosion eating the seal and aluminium away from ****heads that don't flush there motor properly (i always run for at least 10 minutes after a trip)Thanks in advance iboat users
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Old April 2nd, 2003, 02:13 AM
y2jericho y2jericho is offline
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Default Re: Mercury Thunderbolt 650cc 65hp 1970 has a water leak ;(

anyone Ill have pics up soon of my completed fibreglass money hole
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Old April 2nd, 2003, 04:37 AM
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Chinewalker Chinewalker is offline
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Default Re: Mercury Thunderbolt 650cc 65hp 1970 has a water leak ;(

It's really not a big deal to pull the powerhead off and do it the right way, rather than trying to apply a band-aid. In all likelyhood, you've got a blown out gasket, which isn't too hard to replace. It might also be indicative of a bigger problem, one which patching won't fix. You might have a blockage somewhere in the cooling system which is preventing water from entering or exiting properly, in which case pulling the powerhead would likely allow you to see the problem and correct it.Start by pulling any wires/hoses that connect the belly pan to the powerhead - marking them if you're unsure about how to reconnect them. Take pictures, etc. Remove the lower cowling to expose the powerhead retainer nuts - there should be eight. Invite over a big friend to help lift the powerhead - bribe with beer if necessary. If no big friends available, try a come-along looped over a garage rafter. Work carefully and methodically and you'll get it done... might take a long afternoon to complete it...- Scott
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