My Batts died due to ba faulty alternator so I was trying to gett he boat going with the hand crank. I have an Oday 28 with a yanmar 8 hp diesel. I didn't really know how to do it and am reading up now thathe sea cock should've been closed. Did I flood my engine with sea water? Will it start in the future when I return with a fresh battery? Doe any one know how to properly hand crank a diesel engine and get it to start? Any reply would be greatly appreciated!! Thanks Tom Hurley Noank, CT joeroc@charter.net
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Compression Release
There should be a small lever near the valve cover that is the springloaded compression release. Set your throttle to the position that you normally use for starting, select neutral, press back on the compression release, crank the engine as fast as you can and while still cranking let go of the compression release. I have crank started a Yanmar 12 horse several times that way.
There should be a small lever near the valve cover that is the springloaded compression release. Set your throttle to the position that you normally use for starting, select neutral, press back on the compression release, crank the engine as fast as you can and while still cranking let go of the compression release. I have crank started a Yanmar 12 horse several times that way.
Interesting, but how?
I have often thought about how to hand start a diesel engine. A few questions: Where do you get the crank? I assume you need a metal bar of some sort, the kind with two 90 degree turns on it. Or maybe use a winch crank? Where do you connect the metal crank to the engine? Is it realistic to hand crank a 35hp diesel? Thanks.
I have often thought about how to hand start a diesel engine. A few questions: Where do you get the crank? I assume you need a metal bar of some sort, the kind with two 90 degree turns on it. Or maybe use a winch crank? Where do you connect the metal crank to the engine? Is it realistic to hand crank a 35hp diesel? Thanks.
Hand crankable diesels
normally come with a cranking handle that fits in the center of the flywheel. Lift the decompression levers and crank like hell, once it's going around good start closeing the levers.Usually a very difficult job. The old Volvo 2000 series all came with a hand crank. Never could start mine with the hand crank, in fact it was difficult to start with a fully charged battery!
normally come with a cranking handle that fits in the center of the flywheel. Lift the decompression levers and crank like hell, once it's going around good start closeing the levers.Usually a very difficult job. The old Volvo 2000 series all came with a hand crank. Never could start mine with the hand crank, in fact it was difficult to start with a fully charged battery!
crank handles and where they come from
To answer the ?? about the crank handle; My boat came with one. It looks a lot like a winch handle and has a special fitting on it to attach to the fly wheel. I have not yet started mine this way and think it's highly unlikely that any one could start a 35 hp this way. By the way can any one answer my ?? about hand cranknig with the sea cock open? I just want to know if water backs up in the exhaust can it get into the cylinder and if so how do you get the water out?? PLEASE HELP!! Tom
To answer the ?? about the crank handle; My boat came with one. It looks a lot like a winch handle and has a special fitting on it to attach to the fly wheel. I have not yet started mine this way and think it's highly unlikely that any one could start a 35 hp this way. By the way can any one answer my ?? about hand cranknig with the sea cock open? I just want to know if water backs up in the exhaust can it get into the cylinder and if so how do you get the water out?? PLEASE HELP!! Tom
Shut the intake
every time you crank you bring in some water. If the engine doesn't fire it doesn't exhaust. When it does fire you'll have too much water in the system causing a problem called hydrolock. Your piston rods can be bent, your crankshaft bolts can be sheared and it's a major rebuild. It's not only cranking by hand, if your engine doesn't start after a few cranks with the battery you should shut the engine intake through hull. Water is difficult to compress!!!
every time you crank you bring in some water. If the engine doesn't fire it doesn't exhaust. When it does fire you'll have too much water in the system causing a problem called hydrolock. Your piston rods can be bent, your crankshaft bolts can be sheared and it's a major rebuild. It's not only cranking by hand, if your engine doesn't start after a few cranks with the battery you should shut the engine intake through hull. Water is difficult to compress!!!
how cranking is too much cranking?
Okay, so if this is the case and I cranked by hand for about 1 1/2 minutes in total, have I cranked too much h2o into my engine? The engine ran great until the Battery died so I don't think that there's anything wrong other than a dead battery. I DO NOT want to damage my engine. If there is too much water how do you get it out?
Okay, so if this is the case and I cranked by hand for about 1 1/2 minutes in total, have I cranked too much h2o into my engine? The engine ran great until the Battery died so I don't think that there's anything wrong other than a dead battery. I DO NOT want to damage my engine. If there is too much water how do you get it out?
Filling the aqualift
My engine instructions (Universal MX25-XPB) warn against cranking the engine more than 30 seconds or so, without exhaust to blow the water out of the Auqualift muffler. This is spinning it pretty fast with the electric starter run by a fully charged battery. I think it would take a bit longer to fill the muffler by hand cranking. The time it takes to fill it really depends on how much water your raw water pump is pumping, and how large the muffler is. When the muffler is full of water, it can back up into the cylinders, causing damage. If the muffler gets close to full, you need to drain it before continuing. Mine has a drain valve to accomplish this. Hopefully you didn't get any water into the engine. If the muffler is full of water, then you may need to take a closer look, because if it fires up with water in the cylinders, you'll have a problem. P.S. If you can turn the engine over by hand or especially with the starter motor easily, then it probably doesn't have water in the cylinders. What I would do is put a fresh battery in, make sure the muffler is DRAINED, and then crank it over with the starter gingerly. KEEP THE FUEL SHUTOFF CLOSED. If it turns over for 5-10 seconds with the starter without problem, then I think it would be OK to give it fuel, and start it up.
My engine instructions (Universal MX25-XPB) warn against cranking the engine more than 30 seconds or so, without exhaust to blow the water out of the Auqualift muffler. This is spinning it pretty fast with the electric starter run by a fully charged battery. I think it would take a bit longer to fill the muffler by hand cranking. The time it takes to fill it really depends on how much water your raw water pump is pumping, and how large the muffler is. When the muffler is full of water, it can back up into the cylinders, causing damage. If the muffler gets close to full, you need to drain it before continuing. Mine has a drain valve to accomplish this. Hopefully you didn't get any water into the engine. If the muffler is full of water, then you may need to take a closer look, because if it fires up with water in the cylinders, you'll have a problem. P.S. If you can turn the engine over by hand or especially with the starter motor easily, then it probably doesn't have water in the cylinders. What I would do is put a fresh battery in, make sure the muffler is DRAINED, and then crank it over with the starter gingerly. KEEP THE FUEL SHUTOFF CLOSED. If it turns over for 5-10 seconds with the starter without problem, then I think it would be OK to give it fuel, and start it up.
Tom
My boat is on the hard right now. When I run by 8HP Yanmar with the water pick-up hose in a bucket, it will suck less than a gallon per minute at moderate throttle. Take a good look at your muffler. Mine has a bolt on the side near the bottom, that if removed, will drain the muffler. Other than that, replace/recharge the battery, and try to start as usual. I have hand cranked mine much longer than 1 1/2 minutes in the past to bleed the injector, and had no problems (yet). Best of luck, Bryon
My boat is on the hard right now. When I run by 8HP Yanmar with the water pick-up hose in a bucket, it will suck less than a gallon per minute at moderate throttle. Take a good look at your muffler. Mine has a bolt on the side near the bottom, that if removed, will drain the muffler. Other than that, replace/recharge the battery, and try to start as usual. I have hand cranked mine much longer than 1 1/2 minutes in the past to bleed the injector, and had no problems (yet). Best of luck, Bryon
Byron
Byron, Thanks so much for answering my question. I enjoy my boat so much and have very little to complain about. This problem worried me but I'm glad to hear that I most likely did no damage. Thanks again. Tom
Byron, Thanks so much for answering my question. I enjoy my boat so much and have very little to complain about. This problem worried me but I'm glad to hear that I most likely did no damage. Thanks again. Tom
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