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    Old manifold question

    So, I've taken a short break from troubleshooting my new salvage engine. I may have a bad manifold, so have been on the lookout for one on Craigslist and OfferUp, just in case. I am going to "acetone test" when I finish all the "get ready for winter and rain" chores (I'm in the Pacific...
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    Inline 6 250, 165hp water in oil

    I think this may be a separate issue, but I didn't quite understand the cooling configuration, so it may be related to my "water in oil". This replacement engine for my "cracked block" motor is from a salvager. The replacement engine has a strange cooling setup that "achris" identified as a...
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    Inline 6 250, 165hp water in oil

    Thanks for the input, captain mike! I would rather have a cracked riser than manifold - new ones are a lot cheaper! Sounds like there are lots of possibilities, especially not really knowing the history of the "new" engine or "old" one. I'll just try to be as methodical as I can. I'm trying...
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    Inline 6 250, 165hp water in oil

    Didn't hear any air escaping or see any bubbles around the block or head, so I redid all the test setup connections. Sure enough, my setup was at fault. After using teflon paste on my threaded connections and tightening a little more, I pressurized to 16 psi. Less than 1 psi leak down after 4...
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    Sheared water plug on block

    Yippee! Thanks, everyone. Yes, I'm sure it was actually sheared off. I figured the wall was very close to the end of the plug, so I was very careful. The bottom part of the plug did pretty much fall apart. I used just a bit of heat from a #4 welding tip (not a rosebud) to loosen it up...
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    Sheared water plug on block

    Yes, since the plug was "stuck", I'm afraid of the dreaded "broken extractor". It seems like it's easy to "over torque" the little parts if not really careful, I couldn't tell that the plug was shearing! If I have to "drill and re-tap", I guess I would have to go to 3/8 npt? Or do you mean try...
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    Sheared water plug on block

    I was thinking about another part with 1/4-20. Yes, 1/4 npt plug.
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    Inline 6 250, 165hp water in oil

    Sorry, Bondo. I wasn't sure if "long threads" got lost and forgotten. I'll be more patient! The advice and help here has been invaluable.
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    Sheared water plug on block

    So, I was removing the 1/4-20 plug on the engine block (250 inline 6) to drain water from the block. I thought the plug was backing out, but then I noticed that it has sheared off about 3/4 of the way in. The top 3/4 of the plug came out fine, but the bottom 1/4 is still in the block. I am...
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    Inline 6 250, 165hp water in oil

    Making progress on pressure test. I found 3 gross leaks on the input/out to the water circulation pump, and on the cap for the circulation pump. Got 15 psi in the system but it leaked down 10 psi in about 15 minutes. I found another gross leak on the raw water input line to the thermostat...
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    Inline 6 250, 165hp water in oil

    Okay, I think I got all the necessary plumbing parts and got things connected correctly to pressure test the block. Put 15 psi into the tee and noticed quite a bit of water leaking. Looks like the first thing to do is to clean the hose connections at the circulating pump and eliminate those...
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    Inline 6 250, 165hp water in oil

    Thanks, Scott. I see what you are saying now. I was confused... If I had the head and manifold in the loop, there wouldn't be anywhere for air to leak because i would be pressurizing both sides - doh... Still not quite visualizing the elbow/manifold procedure. I'll work on the block test...
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    Inline 6 250, 165hp water in oil

    Aargh! Good news, and bad news. The block drain plug is 1/4, but it sheared off. Guess I need to drill/extractor it out. Ha, ha - nothing is easy!
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    Inline 6 250, 165hp water in oil

    Ah, okay I have a better idea. I found a 1/8 plug at the bottom of the manifold - so I removed it to drain the water. There is also a plug in the block- so I'll drain that also. Seems like the easier way to pressure test is to connect to the 1/8 hole on the manifold and just block the raw water...
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    Inline 6 250, 165hp water in oil

    Pressure test sounds good. So the rubber connector from the riser elbow is pretty big. I have a bunch of PVC pipe, so maybe I can get the other end of the riser elbow rubber onto a piece of PVC and then tee the inlet water hose onto the PVC. Then get a gauge and air line into the PVC pipe...
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    Inline 6 250, 165hp water in oil

    I will eventually get a new elbow, but want to make sure the block is not toast before spending on the elbow. I'm a relative newbie, so not quite understanding the riser/elbow flow. There are 3 oblong holes in the bottom of the elbow. Do I turn the elbow upside down, then fill the 3 oblong...
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    Inline 6 250, 165hp water in oil

    Hi, Scott. How do I "acetone check" the manifold/riser? I only used the "riser/elbow" from the old engine because the riser on my new engine didn't look so good. I did not replace the manifold - the new engine was complete except for the riser (removed, but doesn't look good). 15-20 psi in...
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    Inline 6 250, 165hp water in oil

    Thanks Kenny. So since the engine sat for several (maybe many) years, do you think that the head gasket or head bolts might be leaking? Do you normally put in Permatex in all the head bolt holes? If it's the base of the cylinder, that means the block is kaput, yes? If I remove the valve...
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    Inline 6 250, 165hp water in oil

    The "new for me" inline 6 came off an old timer's boat that had been sitting in a garage (apparently heated) since he had some health issues several years back. My "free boat" had a cracked block. I checked the dip stick when I got the engine and it was "only black", no sign of water...
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    Mercruiser 165 riser elbow plug

    Ok, so I had chores today. Tomorrow I'll get the OA torch going and heat and quench the plug first to see if it at least looks to be cracking loose a bit. Then try to get it started turning with the air hammer and 9/16 bit pushed in hard. If that fails, I'll start drilling and try to get a...
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