AShipShow
Lieutenant Commander
- Joined
- Jul 8, 2016
- Messages
- 1,792
Hi to all the Merc experts out there... I'm in the process of giving my new-to-me 496 MAG (0W358880) a good once over since I have it out of my boat. I figured instead of creating a bunch of new posts whenever I come across something, I'd just start a general thread that I can ask the questions in.
So far I've checked compression and leakdown and everything seems peachy there. I've also dealt with some corrosion on the oil pan by sodablasting and repainting. Next was the seawater pump which had some serious internal grooving so i replaced it with the Hardin Marine stainless pump. Also threw a new starter on as the old one was very corroded and initially needed some percussive maintenance to get it to turn over. I've also inspected the exhaust manifolds with a boroscope and did an acetone test and all looks well there. At this point I'm reassembling everything I removed to do the work above.
My initial question at this point seems like a basic one but want the experts opinion.
I went to put the flywheel back on yesterday and noticed the dowel pin was missing.
I'm 99.9% sure it wasn't there when I removed the flywheel so I looked at the merc parts diagram and sure enough there is one listed. So my initial gut instinct was just get the replacement and put it in, but then I was second guessing myself on if the motor was possibly rebuilt at some point and balanced with the flywheel in a different orientation... Not sure what the likelihood of that is and honestly would like to meet the guy that would have balanced it with the flywheel in a different orientation. I assume I'm overthinking it and should just buy the dowel and reinstall it, but wouldn't mind a second or third opinion.
Side note: if I reinstall, do I need the merc one or will any GM 8.1L dowel work? Anything special about it?
Thanks
So far I've checked compression and leakdown and everything seems peachy there. I've also dealt with some corrosion on the oil pan by sodablasting and repainting. Next was the seawater pump which had some serious internal grooving so i replaced it with the Hardin Marine stainless pump. Also threw a new starter on as the old one was very corroded and initially needed some percussive maintenance to get it to turn over. I've also inspected the exhaust manifolds with a boroscope and did an acetone test and all looks well there. At this point I'm reassembling everything I removed to do the work above.
My initial question at this point seems like a basic one but want the experts opinion.
I went to put the flywheel back on yesterday and noticed the dowel pin was missing.
I'm 99.9% sure it wasn't there when I removed the flywheel so I looked at the merc parts diagram and sure enough there is one listed. So my initial gut instinct was just get the replacement and put it in, but then I was second guessing myself on if the motor was possibly rebuilt at some point and balanced with the flywheel in a different orientation... Not sure what the likelihood of that is and honestly would like to meet the guy that would have balanced it with the flywheel in a different orientation. I assume I'm overthinking it and should just buy the dowel and reinstall it, but wouldn't mind a second or third opinion.
Side note: if I reinstall, do I need the merc one or will any GM 8.1L dowel work? Anything special about it?
Thanks
