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#1
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If it were me I'd pull that harmonic balancer off and trash that whole charging system, water cooled regulator and all. Replace it with a one wire ,side mount, belt drive, external alternator. Just feed it with a fused, switched hot wire and it will solve that problem. As for the leaking cam seals , you can buy a cam seal replacement kit from Mercruiser, comes wih gaskets, seals and all. Just check the surface where the seals ride on the end of the cam and see how bad it is grooved. If it is, you can get a sleeve to repair it. Its really an easy fix. Ive done 3-4, only cost about 40.00. As for the oil pan look on ebay under 470 Mercruiser parts.They usually have some there cheap, the gasket will probley cost more than the pan! Check the web,there alot of good sites to order parts from. They're good motors , you'll get the bugs out. My boat had sat up for about 5 years and it took awhile to get it all straightened out but it was well worth the investment!! Good Luck!
__________________
 77 V20 cuddy with 170 I/O Mercruiser 72 16ft. Carolina w/a 25hp Evinrude 
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#2
08-30-2009, 11:14 AM
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Oh, forgot to tell you, if you don't have one, check ebay for a Clymer Mercruiser manual. It helped me alot! Some good sites to get parts from are;Mercury Parts express,Sierra,Marine Parts express, Overtons,Aftermarket Marine, iboats.com, and even NAPA can get you alot of parts. I would suggest not to buy anything electrical from Advance Auto(I learned a good lesson on a starter). Good Luck!
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77 V20 cuddy with 170 I/O Mercruiser 72 16ft. Carolina w/a 25hp Evinrude
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#3
08-30-2009, 11:22 AM
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Thank's C, I have done some research on what it would take to repair everything but one thing I have been warned about is if I pull the motor getting it lined back up requires some alighnment tools. I can pull the motor but I am a little leary about the alignment.
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#4
08-30-2009, 05:28 PM
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Its not that hard. Just put the shifter in forward and pull the whole outdrive off. When you unbolt the motor to pull it take notice of how the rear motor mount bolts, springs and felt washers go! When you reinstall it ,borrow or buy a Mercruiser Alpha alignment tool and insert it through the gimbal bearing into the coupler on the back of the flywheel. You can adjust the height of the front of the motor using the front motor mount. Coat the alignment tool with coupling grease and insert all the way in. Adjust the height until it slides in smoothly and has a uniform coating of grease on the small end of the tool. You'll see the splined teeth marks evenly all the way around the tool when it adjusted right. Its really easy. Do you have a manual? Look up marinemechanic.com or sterndrive.com, they have alot of good info!
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77 V20 cuddy with 170 I/O Mercruiser 72 16ft. Carolina w/a 25hp Evinrude
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#5
09-05-2009, 01:25 PM
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sorry to have taken so long to respond to this thread, but I personally like the 3.7's. I've had a lot of good use out of them, but to be honest, parts atre getting scarce and they are getting expensive. The best ones to find are the late 80's 3.7 and 3.7lx, they allready had the better manifolds, bigger heat exchangers, gm style starter, and second generation mercarb on the 2bbl's. Before you ditch the charging system, if the balancer is good, and the stator checks out, why not try the rapair regulator, instead of grounding out the over voltage(hence the need for the cooler), the rapair unit cuts the feed voltage off till the voltage drops enough to need additional charging, just like any normal altenator. BTW, if any one needs one, I have a NOS balancer for a 3.7 thats never been installed for sale
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