Move the shift lever while pedaling! Seriously, can't you just ask someone in person for help? See if there's a bike co-op or public workshop in your community.
1. No idea what a Marine bike is.
2. Rarely possible to ID a bike by serial number alone
3. Rarely important what year a bike is unless it's a highly sought after collectible/antique (very unlikely)
4. It's helpful when asking for info to include what you hope to gain by it.
First, it's very rare to be able to ID any bike by serial number. Secondly, if there is no brand or model name showing the bike is either stolen or the victim of a cheap paint job - or both. It has no value other than as something you can ride. Parts and repair procedures are pretty much universal.
Go to Manualslib.com and there are you will find free manuals online with no required sign in or signing up. Just have your brand name and model number and that's it.. This includes any body that is looking for any manual. It is easy and i do it almost every time i need a manual even if it is from the 1950's... Hope this helped....
"Type of bike" is not clear, but in any case that is not the info you need. If you only need the ball bearings the headset bearings are typically 3/16" or 5/32". Crank bearings for most bikes are 1/4", but one piece cranks need caged bearings. Many modern bikes have sealed crank bearings you replace the entire assembly. We need a brand/model and/or a pic of the crank area or the disassembled pieces. It's also important that you use the proper procedure to disassemble, reassemble and adjust the parts.
It is very seldom possible to ID a bike by serial number alone, and you absolutely do not need to do so for replacement parts or repair procedures. Also, if there's no brand or model on the bike it has no significant value. Take to a bike shop or bike co-op for help.
Manualslib.com has all 100% free manuals online and you have the option to buy it as well. I use it all most daily and never once spent a dime... Good luck and hope this helped...
Your chain is likely too tight. It should have essentially no tension at the tightest point in the crank rotation. Also make sure the wheel is correctly aligned in the frame (centered between stays).
Looking up your bike it does not appear to be outside of the design of a run of the mill bike.
Baisc steps
1. Release the back brakes which opens the brakes up os the tire can fit through, flip the bike over
2. Loosen the axial nuts, usually 15 mm
3. The tire should be able to slide forward a little
4. Now grab the derailer and stretch it to add slack yo the chain and get it out of the gear cob's way
5. Push the wheel forward to clear the two tabs
6. Lift wheel from bike.
Or take the bike to a bike shop and pay then to get dirty and greasy
https://m.youtube.com/watch?v=hdjB_wHW0-Q
