Thats about it, check you are getting fuel to the engine, is there any smoke when it cranks? Ensure the stop lever is pulled across when cranking, you can even get someone to hold it in place if the solenoid is bad.
is there any thing other than the shut down solenoid that could make it not start (electrical)? are these bad about the injector pumps going bad?
Correct, thats the only electrical device that could stop it starting provided your starter still spins of course. I have never had a bad injector pump. I have however had a machine someone fiddled with by removing pump parts and the injectors were plugged up. I cleaned them up and replaced the missing pump parts and it runs sweet now.
yes it all makes sense I have been an auto tech for 20 years, just not much experience with bobcats. I like the way you put you can hear compression. I know what you mean. thank you,
the shut off solenoid works, it does spit fuel from the injector lines, and it appears to be diesel. what is next? it sucks hard on the inake against my hand. and there is no smoke when cranking it is cranking a little slow, not real slow though, as far as hearing compression it is a little tough on this one. What is the compression supposed to be and is it checked in the glow plug hole.
Compression should be up to 475 or so PSI, the lower limit from memory is 350. Its checked through the glow plug hole with the fuel lever in the off position, you don't want it firing and blowing the gauge up!.
would all 4 injectors stick at the same time would this have anything to do with the new fuel with low sulfur yes it makes sense.
I am going to assume that this thing should fire on starting fluid or ether. Is one better than the other thank you,
Go real easy on the starting fluid. You can bend push rods and do damage. Not like gas engines or older diesels. Mike
I always thought starting fluid was either. It you crank the engine and have someone give a small shot to the air cleaner. It seems to knock less. Ive heard some terrible noises from guys using either. Mike
It makes a horrible noise when that stuff goes off in a diesel..... Ensure the plugs are not on or you could have pre-detonation.
As Mike said go easy with either/starting fluid (same stuff) But that is a ok way to verify some compression exist as the motor can be run on it (for a few seconds) If you remove the drive belt to the pumps and turn the engine with a wrench, you should be able to feel the resistance of the compression and hear some of the air escaping into the crankcase, if it will suck you hand into the intake thats a pretty good sign the basics are ok.
I guess the difference is the differenceis with a gas engine is that the spark plug helps fire the either ai the proper time with the compression stroke.
Ether is usually the last resort, i did it in my 753 when it refused to show any signs of life. When it kicked and rattled i knew it had to be the fuel system as there was enough compression to detonate the ether. So if you do use it and it kicks and rattles you know it has to be fuel, either the injector pump or injectors. I can take pictures of what needs to be done to free up the injectors if needed, i have never pulled down a working pump though, i have only ever pulled the delivery vales and one way valves out. If you go further you risk messing up the fuel quantities then it has to be done at a diesel shop.
I bought it not running so I know little history of the machine. The intake hose was loose so I suspect that someone has used starting fluid on the machine. How likely is it that a rod could be bent? Are these prone to that? I have compression gauge but not for a diesel. I am working on that.
If you suspect they used either pull youe valve cover and check the valve clearance. That would rule out bent push rods. That is a possability. Mike
Your on the right track with a compression tester too, you will need to salvage a glow plug to make a thread adapter unless you can source the metric threads, no idea what size that is. Make it fit your regular comp tester and put a higher pressure guage on it.
