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jdemaris
01-28-2007 15:22:16
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Re: JD310A Backhoe Hard Starting in reply to Edward1990, 01-28-2007 12:41:25
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The engine has wet-sleeves. When all is clean, they push in by hand. When old and corroded,
you never know. Most of the time, you can push on them from the bottom and they pop out the
top pretty easy. You can do it with a stick of wood (like a hammer handle) and either rap with
a hammer or push up with a bottle-jack. Once in awhile, they can get really stuck. I've had a
few that a bottle jack pushing on a sleeve lifted the crawler up in the air - instead of pushing the
sleeve out - but that's rare. If you get one that bad, borrow - or make a sleeve-puller. It's just a
piece of threaded rod that catches the sleeve bottom and pulls it up through the top. In regard to the injection pump? I cannot tell you a good way to check it when it's not running. Pressure has little to do with it - pressure is determined by the fuel-injectors, not the pump. But,
if the fuel delivery is low - i.e. too little volume of fuel being injected - it will be very hard
starting. Once running, it's would also be low on power. I suggest you do the following checks on the pump. First - make sure power is getting to the
terminal on top. If so, you should hear a click inside the pump whenver the IGN key is on. Second - pull the timing window off the side of the pump. It's a little rectangle held by two
slotted screws. Once off, and the fuel gets done pouring out, look for any debris inside. If you
see little dark colored bits that look like mouse turds - then you've got a broken dampener
inside the pump. It will need to be pulled off and fixed. On other check you can make if desired
- get and injector out of the engine (if you can), leave it out of the engine but hook it back to the
injection line. Then crank the engines and see if it sprays fuel. A person with experience can do an in-frame motor-job on that machine in one day. That's not
counting doing any valve work on the head. If you wish to do that too - that of course takes
more time. When I was on the road doing such repairs - very often I'd just pour some kerosene
down the intake and exhaust ports and see if the valves leaked badly or not. If not - if it was
what the customer wanted - the head would go back on, as is. But, there were usually "rush"
jobs out in the middle of nowhere. In the shop, I'd always pull the head apart do the valves - it
adds a few hours to the job. But, you have to be careful, you cannot grind the seats too deep
like with a gas engine - because it changes the installed valve depth - which causes hard cold
starting. In regard to the fuel injection pump - again- someone with experience can take it apart, fix
what's needed, and put it back together in about one hour. Parts cost can range from $50 to
$100 in most cases. If you send the pump out to a shop - it's probably cost you around $400
-$600 regardless if it only needs $30 in parts or $100.
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