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Oh no, I read a topic on page 7 of this forum about engine knocking and it appears like “game over”. I just got back from northern Arizona where I pulled my 284 out of the barn to build berms on my property to try to eradicate the pot farmers from my property. Just after I finished, I started back to the barn and suddenly a knock began from the engine. A little white smoke from the exhaust, Radiator fluid still looks like radiator fluid. I thought maybe a bent lifter rod so I pulled the valve cover and they all appeared good. I tightened each valve lash an eight of a turn with no regard to using a gauge. It made no difference. This Jinma now has 10 hours on it. Please tell me something simple like “add another potato to the flux capacitor and you will be all set”.
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bad injector, That was not something I would not have thought of. now your talking possible quick fix. So let me rationalize here out loud. bad or clogged injector means bad burn, white smoke, … but I can't understand how it would knock. -oh, unless it is spitting fuel too soon. Ok, Do you think if i pull the injectors and I let them spit onto cardboard I will be able to tell this? Tractor is now 2 hours away. Next time I go up there I want parts in hand to be 80% sure I am going to be able to fix it on that trip. Need to pull the tractor out of the rattlesnake infested barn before I start tearing into it. Once its dismantled, it's hard to get it back into barn to fix on my next trip. I don't mind buying parts to stick on my shelf. Injector, piston rod, rod bearings, lifting rods, …?
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White smoke is unburned fuel if it lingers in the air. I think Tinbender hit the nail on the head – a dribbling injector (stuck/dirty pintle) over-fuels the combustion chamber and you don't get complete combustion. Try slightly loosening the fuel line nut at the injectors, with the engine idling, to determine which one is bad, and replace it. I understand it is cheaper to replace with new (about $70.00) than to rebuild at a diesel shop.
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I agree with all the above, if you are going to go ahead and purchase new injectors for the shelf. You need to know which engine you have, Jinma used 3-different engines in the 254/284 tractors.Yangdong Y385, Liadong KM385 or most uncommon Quanchai QC 385.
You said you have 2- hours on it, where did you buy it from ? What is the year model date of manuf. on the fender ?.
Jinma just went back to using the Yangdong engines in the 254 tractors last year,if the tractor was old stock it may have had the Liadong KM385. Or the best way is to get the engine info off the engine
Tommy
Affordable Tractor Sales
“Your Jinma Parts Superstore”
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Affordable, Bob, Tinbender,
As you were writing your responses last night I was trying to figure out the 284 engine type. I found all the docs, the engine operations manual says Laidong BSHLL1.53LDE, Same for the parts catalog. The purchase order says 2011 EPA IV Lai Dong. engine. So I was drawing the conclusion that it is the KM385 even thought there is no explicit cross reference. I purchased it from Keno in March. I can’t see the engine because its two hours away. correct any misinterpretations please.
Thanks, all. My worries suppressed. -
The valve lash setting is correct for your Engine set COLD, I have the replacement fuel injectors for your engine if you are interested
KM385 Fuel injector
Tommy
Affordable Tractor Sales
“Your Jinma Parts Superstore”
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Thanks, done. will update again in a few weeks once I get back there.
FYI you answered about the valve lash settings but I have since edited that post because I found them in the docs. Thanks. reposting here just for my records.
Lash is set cold exhaust 0.25~0.30mm and intake 0.20~0.25mm Your specifications may be different, check your manual.
Again, thanks all. -
We have seen this many times, I bet it is a injector with some trash, you may run it and it may clear up but keep an eye on the water temp, we have plenty of injectors in stock for all the 385 models if you need one.
Ben
Circle G Tractor Sales, Inc.
http://www.circlegtractorparts.com
662-252-5272
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Thanks again guys.
In this case I decided to eat the cost of the injector and not hassle with a warranty discussion (based on a previous experience that I don't want to elaborate on because the Jinma world is too small).
While I love the circle g website for parts, and do some business there, this time I bought from “affordable” I bought two 80 oz jugs of diesel klean (for both tractors an my F250) elsewhere and a mechanics stethoscope as some other site suggested that you could isolate a problematic injector by sound. This was a $3 harbor freight tool experiment.
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We do appreciate the business !!!!
Thanks
Tommy
Affordable Tractor Sales
“Your Jinma Parts Superstore”
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White smoke could also indicate water in the combustion chamber. I think you should reset the valves before you run the engine. Just tightening each adjuster may have been a mistake.
After you set the overhead start the engine and let it idle a few minutes. Then loosen one injector line at a time until you find the one that is causing the miss/knock. Replace that injector first to see if it cures the problem. If it is still missing on that cylinder you may have a serious issue or just a bad injector pump on that cylinder.
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Well wouldn't ya know it. after letting the tractor sit for more than 6 weeks because my back tells me not to do anything stressful, I went out to the barn fired it up and didn't hear any form of knock. I spent the next 2 hours trying to get the valve lash just the way it is supposed to be. I then I drove it hard up and down the dirt roads around me and I couldn't detect any kind of problem. Thanks all for the advice. New injector is sitting on a shelf now for trouble shooting if it happens again. Also, between police, some community awareness, and my controlled berms across my roads, the pot farmers are off my property for now.
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Wait for a real diesel mechanic to chime in.
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