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jdemaris
12-12-2003 19:14:20
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Re: JD 350C Injector Pump in reply to Andrew In TN, 12-12-2003 14:56:58
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First of all you ought to ascertain if the pump is actually turning. Pull the timing window off the side and see if the insides are moving when the engine is cranking. If you're sure the pump is turing, I'd pull the top cover off the pump, look inside and make sure the fuel metering valve isn't stuck. I don't know how to verbally describe it to you. Best you just take a look at the cover when you remove it and look at the swing-arm that's attached to the electro-magnetic solenoid that's bolted to the top cover. It's the thing you're hearing clicking when you turn the key on. That swing arm, with no electricity, it in the "out' position since it's spring loaded. This is what shuts the engine off. In this position, it pushes the fuel metering valve in the pump closed. When the solenoid gets 12 volts, it pulls the swing arm in, and then the fuel metering valve, no longer being pushed closed, opens by spring pressure. So, just look inside and figure out where the arm was hitting and you'll see the valve. Quite possible it's just stuck from sitting, and you can rock it back an forth by hand to free it. Lots of other things to check, but that's the most common problem if it's been sitting for a real long time. The injection pump also has it's own fuel transfer pump in the back of it along with a fine mesh filter screen that can get plugged while in storage. But, I won't go into that now. As far as fixing the pump goes, it's a very common pump, and easy to work on. Any good diesel shop can work on it. Problem is, many if not most shops won't "fix" pumps unless you let them do a total rebuild, necessary or not. I used to do all the Roosa Master and CAV pump work at a Deere dealership. Pretty easy to go all though the little JDB pump in one hour.
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