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  1. R

    Water or oil in Cylinders

    Hiya, After your reply, I bought a compression test kit and checked the engine. With the engine cold, I got the following results: 1: 155 psi 2: 155 psi 3: 150 psi 4: 150 psi My battery was a bit low during the test, so the cranking speed may have been lower than ideal. Because of that, I...
  2. R

    Water or oil in Cylinders

    The head yes, the block I am not sure…
  3. R

    Water or oil in Cylinders

    When I rebuilt the engine, I didn’t spend any time on the exterior, and I haven’t replaced the starter or the alternator yet. However, everything inside the engine is new. The rebuild was professionally machined and assembled by a machine shop.
  4. R

    Water or oil in Cylinders

    I removed the manifold after your message and noticed that all the exhaust ports are completely dry. What surprised me is that all the intake ports are wet. I have no idea how that's possible. Is that something you would normally see with a cracked exhaust manifold? I replaced the elbow/riser...
  5. R

    Water or oil in Cylinders

    I am currently pressure testing it at 15 psi. Over 15 minutes, I lost about 12 mbar (approximately 0.17 psi). I suspect this is due to the rubber hoses used during the test. Do you think this is within specification? Is it possible that if the exhaust is cracked, the cylinders fill with water...
  6. R

    Water or oil in Cylinders

    The water likely got in because I replaced the elbow riser and there was still some water trapped inside it. However, I do not think this could be the cause of the issue I am seeing. Regarding the carbon deposits: after about 15 minutes of running, there was almost no carbon on cylinder 4 and...
  7. R

    Water or oil in Cylinders

    Hello everyone, I recently rebuilt a Mercruiser 140 and have been running it for a short period. After about 20 minutes of running time, I inspected all cylinders and I have the impression that water may have entered the cylinders. I would really appreciate your feedback on whether this...
  8. R

    MerCruiser 140 (’68–’82) choke tube missing – alternative or electric choke conversion?

    Hi all, I have a MerCruiser 140 engine (1968–1982 range) that I have completely rebuilt. It is now running perfectly and overall in excellent condition. The only thing I still need to finish is the choke setup. For that, I’m missing the small tube that runs between the intake manifold and the...
  9. R

    water in engine, is it salvageable?

    Ran the engine for about ten hours now, with hardly any water in the oil, and it runs perfectly. I think the tiny bit of moisture in the oil is just condensation or something like that. If I can give future people some advice: don’t rebuild, just buy a new engine. It’s not worth the time or...
  10. R

    Mercruiser Lower unit wont go back together

    I accidentally forced it once and turned the prop. It put a small burr on the top of the lower unit spindle. Luckily, after cleaning up the edges with a small file, everything went back together smoothly. Lesson learned: never force it.
  11. R

    water in engine, is it salvageable?

    Had it rebuild, will build my engine up comming week. New pistons + Rings 0.020 Bore flattened everything New valves Polished valves Replace camshaft bearings New Timing gear Polished both shafts Balaneced the flywheel New oil pump New waterpump + thermostat All seals replaced All gaskets...
  12. R

    water in engine, is it salvageable?

    already done right away, and immediately replaced the blower.
  13. R

    water in engine, is it salvageable?

    Just a little update:, Got the engine out of my boat and want to hang it in my engine stand soon. Have taken the cylinder head to a professional workshop and they are now overhauling the head. They pressed the head and it turned out to be air tight. They did have to put in new valves because...
  14. R

    water in engine, is it salvageable?

    Aiii sweet, im in the same situation, the water is in my block for max 3 days. So im rolling the dice as well.
  15. R

    water in engine, is it salvageable?

    Its a boat from 1977 so its worth nothing.
  16. R

    water in engine, is it salvageable?

    Aah okay clear, I'll see what's the wisest thing to do. I will also call some local rebuilders to see if I can buy an overhaul engine with the trade-in of the old one.
  17. R

    water in engine, is it salvageable?

    i fully understand your react and do agree. The thing is just that this project has been going on for over 2 years and has cost quite a lot of money by now. As I see it now, all the rust in the pistons is surface and most of it is even rust water which I wipe right off. I was thinking myself to...
  18. R

    water in engine, is it salvageable?

    I know it would have been better, but I did not have the tools to perform that test. Besides, the engine went to a mechanic once 2 years back and he only started talking about a possible crack in the exhaust.
  19. R

    water in engine, is it salvageable?

    I want to take the cylinder head to an engine restoration shop this afternoon to flatten and grind everything. Then I will immediately ask if they can do a pressure test on it. Personally, I don't really feel like taking the whole engine block out to do a pressure test. Is there any way to check...
  20. R

    water in engine, is it salvageable?

    I am in the process of restoring a boat, in the process of which I hung the boat engine in the other day. Then got the engine running but soon heard the sound of the exhaust leaking. Then on further inspection, I noticed that water had entered the engine and especially in the rear cylinder. Now...
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