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Push starting your boat
Although I have few elecrical gadgets to use power, I do worry about
having enough juice to run my VHF and running lights and am also partial to having a small fan. Auto-pilot is also nice on long runs. So what happens if my batteries accidently get run down? My old Yanmar 1GM could be han cranked but my 2GM, no. However, while looking into the engine compartment one day while under sail, I noticed my prop shaft was spinning like mad cuz I hadnt put it in gear (Yanmar says put it in reverse). So: maybe not so useless Idea #3727 Can you release the compression of the engine with the decompression levers, get going good under sail with engine in gear an use the spinning prop to sorta "push-start" the engine with you suddenly giving it compression? I might try this next time I am out. For that matter, I have heard of these spinning things you can drag behind to generate power but I can imagine getting it caught on a crab trap or something or having its line wrap round your prop. So, why not put a v-belt pulley on the prop shaft and use it to turn a belt attached to another alternator. This way you could charge your batteries without starting the engine (sure it slows you down some). This cannot be original cuz I know I saw it somewhere but cannot imagine where. |
Push starting your boat
I've never started a diesel this way, but 40 years ago we started a 4
cylinder gas engine by letting the prop spin and slam it into gear. Actually I didn't think it would work, but it did and we were able to recharge our dead battery. Of course I always thought you couldn't push start a diesel but then someone proved me wrong by getting a couple guys and push starting a 2.5 ton Izuzu truck. I think the key is to have the engine properly tuned, timed and primed before you attempt this. -- My opinion and experience. FWIW Steve s/v Good Intentions |
Push starting your boat
Parallax wrote:
Can you release the compression of the engine with the decompression levers, get going good under sail with engine in gear an use the spinning prop to sorta "push-start" the engine with you suddenly The large diesels used to power freighters can be restarted this way quite easily, no compression release required. This cannot be original cuz I know I saw it somewhere but cannot imagine where. Many of these same ships use a "shaft generator" driven off the propeller shaft. Rick |
Push starting your boat
Used to start 6-71's with mechanical reverse gears, this way all the time.
Parallax wrote: Although I have few elecrical gadgets to use power, I do worry about having enough juice to run my VHF and running lights and am also partial to having a small fan. Auto-pilot is also nice on long runs. So what happens if my batteries accidently get run down? My old Yanmar 1GM could be han cranked but my 2GM, no. However, while looking into the engine compartment one day while under sail, I noticed my prop shaft was spinning like mad cuz I hadnt put it in gear (Yanmar says put it in reverse). So: maybe not so useless Idea #3727 Can you release the compression of the engine with the decompression levers, get going good under sail with engine in gear an use the spinning prop to sorta "push-start" the engine with you suddenly giving it compression? I might try this next time I am out. For that matter, I have heard of these spinning things you can drag behind to generate power but I can imagine getting it caught on a crab trap or something or having its line wrap round your prop. So, why not put a v-belt pulley on the prop shaft and use it to turn a belt attached to another alternator. This way you could charge your batteries without starting the engine (sure it slows you down some). This cannot be original cuz I know I saw it somewhere but cannot imagine where. |
Push starting your boat
You have to put the Yanmar in reverse to stop the prop because
reverse is mechanical. In forward the prop will still rotate because it is fluid drive. So much for push starting a Yanmar. I was thinking of getting one of the windup starters as a backup. Doug "Parallax" wrote in message om... Although I have few elecrical gadgets to use power, I do worry about having enough juice to run my VHF and running lights and am also partial to having a small fan. Auto-pilot is also nice on long runs. So what happens if my batteries accidently get run down? My old Yanmar 1GM could be han cranked but my 2GM, no. However, while looking into the engine compartment one day while under sail, I noticed my prop shaft was spinning like mad cuz I hadnt put it in gear (Yanmar says put it in reverse). So: maybe not so useless Idea #3727 Can you release the compression of the engine with the decompression levers, get going good under sail with engine in gear an use the spinning prop to sorta "push-start" the engine with you suddenly giving it compression? I might try this next time I am out. For that matter, I have heard of these spinning things you can drag behind to generate power but I can imagine getting it caught on a crab trap or something or having its line wrap round your prop. So, why not put a v-belt pulley on the prop shaft and use it to turn a belt attached to another alternator. This way you could charge your batteries without starting the engine (sure it slows you down some). This cannot be original cuz I know I saw it somewhere but cannot imagine where. |
Push starting your boat
Parallax wrote:
Although I have few elecrical gadgets to use power, I do worry about having enough juice to run my VHF and running lights and am also partial to having a small fan. Auto-pilot is also nice on long runs. So what happens if my batteries accidently get run down? My old Yanmar 1GM could be han cranked but my 2GM, no. However, while looking into the engine compartment one day while under sail, I noticed my prop shaft was spinning like mad cuz I hadnt put it in gear (Yanmar says put it in reverse). So: maybe not so useless Idea #3727 Can you release the compression of the engine with the decompression levers, get going good under sail with engine in gear an use the spinning prop to sorta "push-start" the engine with you suddenly giving it compression? I might try this next time I am out. Unluckily, your (and our) prop freewheels in forward. If you slam it into reverse, you would try to start the engine in the wrong direction. Best would probably be a solar panel. Turn everything off for an hour or two and even a 12w panel might give you enough juice: 2GMs really don't need much power to start if everything else is in good shape. Changing my mind: Best is two battery banks. Only draw from one at a time, but always charge both. And upgrade any of your battery leads that is less than 1/0. We can start off one of our group 31 batteries during the summer even if it's showing about 11.5v. (When it's chilly, we need better voltage, but I haven't checked it since I upgraded our cables.) -- Jere Lull Xan-a-Deux ('73 Tanzer 28 #4 out of Tolchester, MD) Xan's Pages: http://members.dca.net/jerelull/X-Main.html Our BVI FAQs (290+ pics) http://homepage.mac.com/jerelull/BVI/ |
Push starting your boat
otnmbrd wrote in message link.net...
Used to start 6-71's with mechanical reverse gears, this way all the time. Parallax wrote: Although I have few elecrical gadgets to use power, I do worry about having enough juice to run my VHF and running lights and am also partial to having a small fan. Auto-pilot is also nice on long runs. So what happens if my batteries accidently get run down? My old Yanmar 1GM could be han cranked but my 2GM, no. However, while looking into the engine compartment one day while under sail, I noticed my prop shaft was spinning like mad cuz I hadnt put it in gear (Yanmar says put it in reverse). So: maybe not so useless Idea #3727 Can you release the compression of the engine with the decompression levers, get going good under sail with engine in gear an use the spinning prop to sorta "push-start" the engine with you suddenly giving it compression? I might try this next time I am out. For that matter, I have heard of these spinning things you can drag behind to generate power but I can imagine getting it caught on a crab trap or something or having its line wrap round your prop. So, why not put a v-belt pulley on the prop shaft and use it to turn a belt attached to another alternator. This way you could charge your batteries without starting the engine (sure it slows you down some). This cannot be original cuz I know I saw it somewhere but cannot imagine where. Bob Griffith wrote about doing this regularly on his cutter "Awahanee" in his book "Bluye Water"; went on a beam reach and when she was going fast enough, put her in gear. john |
Push starting your boat
Doug,
I think you're thinking of the 35 engine The transmission in the 1gm (and 2 and 3GM) are all purely mechanical. At least from my investigation of the service manual, the forward gear is a mirror image of the reverse gear. the cluch cone simply bears against the forward drive gear, just like it does in reverse. The transmission is "spalsh lubricated, not hydraulic at all. Still it doesn't mean you can bump start. The 2GM20F in my doc neighbours boat (Tanzer 31)is hand startable. Parallax's should be also, you just need to use the decompression levers. (the hand crank drive pin has a bolted on cover plate on the newer 2GM20F's) so it looks like it's not hand startable, just take the plate off and cut the end off Reinstall and your engine is now hand crankable! Pierre "Doug Dotson" wrote in message ... You have to put the Yanmar in reverse to stop the prop because reverse is mechanical. In forward the prop will still rotate because it is fluid drive. So much for push starting a Yanmar. I was thinking of getting one of the windup starters as a backup. Doug "Parallax" wrote in message om... Although I have few elecrical gadgets to use power, I do worry about having enough juice to run my VHF and running lights and am also partial to having a small fan. Auto-pilot is also nice on long runs. So what happens if my batteries accidently get run down? My old Yanmar 1GM could be han cranked but my 2GM, no. However, while looking into the engine compartment one day while under sail, I noticed my prop shaft was spinning like mad cuz I hadnt put it in gear (Yanmar says put it in reverse). So: maybe not so useless Idea #3727 Can you release the compression of the engine with the decompression levers, get going good under sail with engine in gear an use the spinning prop to sorta "push-start" the engine with you suddenly giving it compression? I might try this next time I am out. For that matter, I have heard of these spinning things you can drag behind to generate power but I can imagine getting it caught on a crab trap or something or having its line wrap round your prop. So, why not put a v-belt pulley on the prop shaft and use it to turn a belt attached to another alternator. This way you could charge your batteries without starting the engine (sure it slows you down some). This cannot be original cuz I know I saw it somewhere but cannot imagine where. |
Push starting your boat
I had a Trojan Group 24 that easily started my 3GM30F
Pierre "Jere Lull" wrote in message ... Parallax wrote: Although I have few elecrical gadgets to use power, I do worry about having enough juice to run my VHF and running lights and am also partial to having a small fan. Auto-pilot is also nice on long runs. So what happens if my batteries accidently get run down? My old Yanmar 1GM could be han cranked but my 2GM, no. However, while looking into the engine compartment one day while under sail, I noticed my prop shaft was spinning like mad cuz I hadnt put it in gear (Yanmar says put it in reverse). So: maybe not so useless Idea #3727 Can you release the compression of the engine with the decompression levers, get going good under sail with engine in gear an use the spinning prop to sorta "push-start" the engine with you suddenly giving it compression? I might try this next time I am out. Unluckily, your (and our) prop freewheels in forward. If you slam it into reverse, you would try to start the engine in the wrong direction. Best would probably be a solar panel. Turn everything off for an hour or two and even a 12w panel might give you enough juice: 2GMs really don't need much power to start if everything else is in good shape. Changing my mind: Best is two battery banks. Only draw from one at a time, but always charge both. And upgrade any of your battery leads that is less than 1/0. We can start off one of our group 31 batteries during the summer even if it's showing about 11.5v. (When it's chilly, we need better voltage, but I haven't checked it since I upgraded our cables.) -- Jere Lull Xan-a-Deux ('73 Tanzer 28 #4 out of Tolchester, MD) Xan's Pages: http://members.dca.net/jerelull/X-Main.html Our BVI FAQs (290+ pics) http://homepage.mac.com/jerelull/BVI/ |
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