Mercruiser 470 balancer removal help

[adamjr]

Good day all. I have a 470 I pulled from a boat I was required to take in order to get a trailer and outdrive. I have been meaning to scrap it but other things just seem so much more fun to do. To maximize my scrap money I wanted to separate all of the steel parts from the aluminum block and assorted circulation parts. I have all the con rod bearing caps and main bearing caps removed as well as the rear main and flywheel. Problem is that the motor, as received, has one of the three bolts broken off where you would bolt on a balancer puller. This prevents me from removing the timing cover and removing the timing chain. I don't believe my 4 1/2" grinder is up to the task and I don't believe there is a saw blade available that will cut through the crank journal that wouldn't cost as much as I could hope to get in scrap.

With the above in mind does anyone have any idea how to get the balancer off? Obviously I'm not worried about damage.

Thanks in advance for suggestions.

 

[Bt Doctur]

simply drill and tap new holes a 1/2 inch above the existing holes

 

[stonyloam]

First off I would try to remove the broken bolt and save the rotor by using a puller. Second selling it for srap is a BIG mistake. the individual parts should be worth a several hundred dollars on e-bay. the crankshaft that you are thinking about cutting up, if it is serviceable is probably worth a $100-$200 alone. The timing chain covers are worth $50 at least. The rotor (balancer) another $100. not to mention all of the other stuff. All in all you are probably looking at several hundred dollars worth of parts rather than $40 worth of scrap. Check out "Mercruiser 470 parts on e-bay". If you don't sell the parts, I'll bet you scrap dealer will.
P.S. A good 4" heat exchanger could be worth $200. It ain't no 3.0 that is probably worth more as scrap LOL!

 

[adamjr]

Sorry it took so long for me to respond. I used BT Doctur's suggestion to remove the rotor and it worked like a charm.

Stony, I hear what you're saying but I see a lot of that stuff sit on fleebay and go unsold. If it does sell it costs a lot of green to ship a crank. When it comes to Craigslist which used to be my alternative for stuff that's a pain to ship, well, you know how Craigslist shoppers are. They're mostly flakes. The magnets on the rotor were mostly cracked but the stator looks good. I'll ohm that out to see if it's good and likely sell that and the covers on ebay.

 

[stonyloam]

Yeah the easiest thing to sell are the waterpump and timing chain covers, they crack pretty easily and should sell pretty well, because lots of guys are changing out the cam seals. They only weigh a couple of pounds. The Mercarb carburetor should sell too. It is used on a bunch of engines.

 

[adamjr]

The carb and valve cover were off when I got it. The p.o.'s ex wife told the guy I got it from that it stopped running and he didn't know why. It sat in their driveway for 10 years uncovered. The decks rotted out and some woodland creatures destroyed the interior in that time. In taking the motor apart the crank looks good. When I pulled the head off there was water in the two and three cylinders. I don't know if that was related to his issue or if that was just because it sat uncovered with no carb and water could run through the intake into the partially open valves of those cylinders. I let the engine sit with the head off of it in my side yard for nearly two years until the dirty looks and the constant reminders from my Admiral made me get into completing the disassembly. The piston rings are rusted to the sleeves but from what I can see the walls aren't scored. I'd hate to think that the p.o. started to take apart the top end because the battery wouldn't charge due to the broken magnets I found in the rotor. Stranger things have happened as evidenced by people that ask for advice and get it from the industry professionals around here and ignore it and continue to work on an area with nothing to do with the issue they asked about.