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  1. AShipShow

    Mercruiser 496 MAG Refresh Thread

    I'll have to give the pot-belly route a shot... I don't think the arbor press route will work because its not warped like a potato chip, its more that the angle of the bore of the pulley no longer perpendicular to the plane of the pulley. If it put i on a flat table, there aren't any raised...
  2. AShipShow

    Mercruiser 496 MAG Refresh Thread

    Back again with more confusion... I'm an idiot and removed my power steering pulley with a 3 jaw puller before finding out that thats a terrible idea and you need to use the PS puller that you can rent from autozone/etc.. So after reinstalling the pulley and checking my alignment, I realized the...
  3. AShipShow

    1987 Power Play XLT-185 - floors, stringers, and upholstery

    You're telling me... I just bought a boat on a triaxle aluminum trailer with EOH brakes and the actuator is bad... The actuator alone is $800 :sick:
  4. AShipShow

    Suggestions on LongBlock Supplier

    If yours is the vortec 4.3 then your actually much better off trying to find a lower mileage one at a salvage yard since they used those engines for quite a while. If its pre-vortec, your gonna have a hell of a time finding one in "worthwhile" condition.
  5. AShipShow

    Mercruiser 496 MAG Refresh Thread

    OK, so no worries over like shear forces on the bolts or anything? I'm assuming not simply because from what I can tell, the dowel pin is a spring pin anyways, not solid, so it couldn't really provide much rotational resistance anyways.
  6. AShipShow

    Suggestions on LongBlock Supplier

    Yea, Michigan Motorz is going to be the default answer because they have a really good reputation. Interesting that Atlantic Marine seems to have a better warranty on reman though.. You might want to study both warranties though to see if there are any weird loop holes. Honestly if it were me...
  7. AShipShow

    Mercruiser 496 MAG Refresh Thread

    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...
  8. AShipShow

    Replacement Exhaust Manifolds for Merc 496

    @Bondo I can't believe they haven't made you you're own "ayuh like" button by now :ROFLMAO:
  9. AShipShow

    Replacement Exhaust Manifolds for Merc 496

    I'm neither lol... The hailing port on the boat is Washington DC (but that could be anything, doesn't mean where it was used)... The boat was stored in Occoquan, VA, maybe 20mi down the potomac from DC, but still quite a ways up from the mouth at the chesapeake. Edit: I just found a...
  10. AShipShow

    Replacement Exhaust Manifolds for Merc 496

    Heres a couple boroscope images.. Last image is the worst one, but I'm not so sure its flaking rust vs dirt lodged down in the bottom corner.
  11. AShipShow

    Replacement Exhaust Manifolds for Merc 496

    Yea, the inside of the manifolds is basically like a thin brown dust kinda like you described... There are a few areas that look like they are darker, but its weird, they are like kinda shiny, not so much a normal rust look.
  12. AShipShow

    Replacement Exhaust Manifolds for Merc 496

    Sorry, I guess what I said is confusing now that I read it back... I removed the elbow, but I stuck the boroscope in the manifold, not the elbow (since its stainless, I wasn't worried about it). Good to know about Barr, at least saves me a couple hundos.
  13. AShipShow

    Replacement Exhaust Manifolds for Merc 496

    Just took the starboard elbow off and stuck my boroscope in both sides and to be honest I was shocked how good they looked... obviously some corrosion but no flaking rust... I also reached out to the broker who I bought the boat thru and he said they almost never see failures of those manifolds...
  14. AShipShow

    Replacement Exhaust Manifolds for Merc 496

    Didn't think about it until just now, but i just bought a fancy little boroscope... maybe a good opportunity to try it out... maybe inspect the cooling passages as well as the actual exhaust ports for signs of rust.. Still no way of knowing how thick remaining cast iron is tho
  15. AShipShow

    Replacement Exhaust Manifolds for Merc 496

    I don't really know yet.. I haven't removed the elbow or manifolds yet... That being said, even if I can see in there, theres guaranteed to be rust... I think the issue is, theres no way of knowing how much wall thickness remains. The boat was used in the middle chesapeake, in the DC area, so...
  16. AShipShow

    Replacement Exhaust Manifolds for Merc 496

    Does anyone have any recommendations for a decent aftermarket option for exhaust manifolds? I'm thinking of replacing them on my 2006 project boat and I don't know if they've ever been replaced so looking at doing it as a preventative measure, but I don't love the almost $1500 price tag for OEM...
  17. AShipShow

    Merc 496 Mag Compression and Leakdown Results

    I don't know how full it was as it was empty when I got it but the starter is the only thing that is really rusty so I think that's as high as it got... But honestly, it could just be from normal corrosion too.. but it seems more than coincidence that most of the rust is on the seawater pump...
  18. AShipShow

    Merc 496 Mag Compression and Leakdown Results

    LOL.. There are some definite issues that I'm starting to uncover.. The quick backstory.. bought this boat (28' Campion cabin cruiser) knowing full well it was a project... I pulled the motor mostly because I wanted to have better access to evaluate everything on the engine and it will make...
  19. AShipShow

    Merc 496 Mag Compression and Leakdown Results

    Yea, I was looking through the spark plug hole with a light as my wife was turning the crank and when it stopped moving I had her stop... This worked perfectly fine on all other 7 cylinders and I even tested cylinder 6 twice so I'm pretty confident the crank was in the right position. Funny...
  20. AShipShow

    Merc 496 Mag Compression and Leakdown Results

    Glad to hear others on the same page as me... especially looking and seeing what a new gasket set alone costs 😧 Once I get done with a few other checks, I will try running it and retest the leakdown on cylinder 6... Hoping it gets a little better but even if it doesn't, I'll probably run it as...
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