Hello all. I've been browsing forums for a few weeks trying to find the answer to my problem and I'm not coming up with much so here I am begging for help.
The background: I have a 2007 Mercruiser 3.0 TKS with EST ignition. I had the engine replaced(longblock) over the winter due to a small crack that was leaking oil.
Upon running the boat for about 2 hours, It started misfiring and then died. After a little investigation i found the rotor to be melted and the pickup coil housing was melted as well. When i went to replace the pickup coil, the shaft where the retaining clip goes was broken off so I ended up buying a whole new distributor. I let the shop that replaced the engine install it/set timing and we thought all was good. After another two hours it started misfiring again. This time the rotor was melted, shaft was almost seized, and the pressed on plate that the cap screws into was broke loose(rotating) explaining the misfiring.
Obviously there is a heat issue. There is no wear on the lower gear nor discoloration an the shaft so I assume its not from mechanical energy. Only other option is electrical?
So now with electrical being my least knowledgeable skill, what would cause too much power coming in the top of the distributor? The shop said they thought it was the ignition coil and ordered a new one but this makes no sense to me. I checked the coil with my voltmeter and it ohm'd out to spec. If it was bad, I would expect less power out. The only other topic i've seen on this was an overheating ignition module and that was due to a ground not being hooked up. Is this what i should be searching for? If so, where do I start?
The engine does run but within a minute the distributor is already smoking hot! I am at a loss and unfortunately, so is the shop working on it. Thanks in advance for any help.
-James
The background: I have a 2007 Mercruiser 3.0 TKS with EST ignition. I had the engine replaced(longblock) over the winter due to a small crack that was leaking oil.
Upon running the boat for about 2 hours, It started misfiring and then died. After a little investigation i found the rotor to be melted and the pickup coil housing was melted as well. When i went to replace the pickup coil, the shaft where the retaining clip goes was broken off so I ended up buying a whole new distributor. I let the shop that replaced the engine install it/set timing and we thought all was good. After another two hours it started misfiring again. This time the rotor was melted, shaft was almost seized, and the pressed on plate that the cap screws into was broke loose(rotating) explaining the misfiring.
Obviously there is a heat issue. There is no wear on the lower gear nor discoloration an the shaft so I assume its not from mechanical energy. Only other option is electrical?
So now with electrical being my least knowledgeable skill, what would cause too much power coming in the top of the distributor? The shop said they thought it was the ignition coil and ordered a new one but this makes no sense to me. I checked the coil with my voltmeter and it ohm'd out to spec. If it was bad, I would expect less power out. The only other topic i've seen on this was an overheating ignition module and that was due to a ground not being hooked up. Is this what i should be searching for? If so, where do I start?
The engine does run but within a minute the distributor is already smoking hot! I am at a loss and unfortunately, so is the shop working on it. Thanks in advance for any help.
-James
