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.
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...
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...
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...
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...
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...
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...
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.
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...
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...
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.
