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Diesels
How do you know when you have a bad injector and how do you figure
out which one it is? Gordon |
Diesels
On Sat, 25 Apr 2009 07:52:32 -0700, Gordon wrote:
How do you know when you have a bad injector and how do you figure out which one it is? Gordon A bad injector will usually cause a miss, or rough running. A field check is to run the engine at idle and loosen one injector pipe connection at a time. Loosening the connection on a good injector will cause the engine to miss or run rough. Loosening the connection on a bad injector will change nothing. However.... Injectors can be set at the wrong opening pressure or have a defective spray pattern that may not show up using the above check and can only be found by removing the injectors and having them tested at a shop that specializes in repairing fuel system components. Cheers, Bruce in Bangkok (bruceinbangkokatgmaildotcom) |
Diesels
"Gordon" wrote in message
m... How do you know when you have a bad injector and how do you figure out which one it is? Gordon Remove the spark plug wire one cylinder at a time. The spark plug wire removed on the cylinder with the bad injector will not cause an additional miss. Wilbur Hubbard |
Diesels
Gordon wrote in
m: How do you know when you have a bad injector and how do you figure out which one it is? Gordon YouTube is your friend! http://www.youtube.com/results? search_type=&search_query=diesel+injector+testing& aq=5&oq=diesel+injec How NOT to test injectors: http://www.youtube.com/watch?v=_gUB81VfK40 Bad spray pattern from crap in the injector will make one cylinder knock really loud. There's ALWAYS one injector that knocks louder than the rest and that's just "normal". Same thing is true if the metering circuit doesn't close right, bad springs, etc. That cylinder pulls lots harder than the others from the supercharge of fuel. A clogged injector simply has no fuel spray so the cylinder either never fires at all and the engine goes on "humping" past the dead cylinder's compression stroke never having a power stroke or the engine runs like crap because that cylinder isn't pulling its share of the load, virtually putting the engine in idle when it's the bad cylinder's turn to fire. Testing is pretty easy. All this runs on very high pressure, but very tiny amounts of fuel. With the engine running under load, underway, simply take an appropriately sized wrench and crack open the fuel supply fitting to each injector, one at a time, while listening to the results as you add yet another cylinder that isn't firing. When you come to the one that's not firing or is overfiring, when you crack its fuel line the engine runs the same....or that awful knocking from too much fuel stops. When you open the good injectors, adding to the problem, the engine runs much worse, now that it has two cylinders dead instead of just one..... When you think you've got it, shut her down and swap that injector with a spare I just KNOW you have in your spares locker, right? You DO have a calibrated torque wrench and know how to use it so you can set the torque on the nuts correctly, right? No? Get one. Harbor Freight's cheap Chinese torque wrenches are amazingly close to correct....closer than the Snap-On ones we tested for lots more money. If that fixes it, you found it. If nothing changes, you'll know we have injector pump problems you can't fix at sea. BTW, Harbor Freight also has fuel injector testers, the kind you attach to the injector then pump by hand so you can see the spray pattern of fuel coming out of them....very handy for testing injectors. What make/model of engine are we testing, anyways?? Doxfords wouldn't use this kind of test: http://www.youtube.com/results?searc...y=doxford&aq=f -- ----- Larry You can tell there's very intelligent life in the Universe because none of them have ever tried to contact us..... |
Diesels
Gordon wrote in
m: How do you know when you have a bad injector and how do you figure out which one it is? Gordon Here's a video of about the same tester I use: http://www.youtube.com/watch?v=6NSydOqjIY8&NR=1 It's not rocket science....just make sure all the air bubbles are out of it. -- ----- Larry You can tell there's very intelligent life in the Universe because none of them have ever tried to contact us..... |
Diesels
"Wilbur Hubbard" wrote in
anews.com: "Gordon" wrote in message m... How do you know when you have a bad injector and how do you figure out which one it is? Gordon Remove the spark plug wire one cylinder at a time. The spark plug wire removed on the cylinder with the bad injector will not cause an additional miss. Wilbur Hubbard Wilbur, or whatever name you're using today.....How many diesel engines have you ever actually touched? -- ----- Larry You can tell there's very intelligent life in the Universe because none of them have ever tried to contact us..... |
Diesels
I picked up a used W40 for parts. It was in a Tartan 37 and when he
saw a light sheen of oil on the cooling fresh water, he decided to re engine. No smoke, no water in the oil, smooth running. Installation of a new Yanmar only cost him 18k! The W40 came with a new panel, spare alternator, upper end gasket kit, impellers, oil filters and a good spare injector. When I saw the spare injector, I realized I didn't know how to test to replace the bad one. What make/model of engine are we testing, anyways?? Doxfords wouldn't use this kind of test: http://www.youtube.com/results?searc...y=doxford&aq=f |
Diesels
"Larry" wrote in message
... "Wilbur Hubbard" wrote in anews.com: "Gordon" wrote in message m... How do you know when you have a bad injector and how do you figure out which one it is? Gordon Remove the spark plug wire one cylinder at a time. The spark plug wire removed on the cylinder with the bad injector will not cause an additional miss. Wilbur Hubbard Wilbur, or whatever name you're using today.....How many diesel engines have you ever actually touched? http://www.indianindustry.com/engineparts/2815.html Diesel engine spark plugs! Gotcha, Larry. Wilbur Hubbard |
Diesels
On Sat, 25 Apr 2009 15:30:21 -0700, Gordon wrote:
I picked up a used W40 for parts. It was in a Tartan 37 and when he saw a light sheen of oil on the cooling fresh water, he decided to re engine. No smoke, no water in the oil, smooth running. Installation of a new Yanmar only cost him 18k! The W40 came with a new panel, spare alternator, upper end gasket kit, impellers, oil filters and a good spare injector. When I saw the spare injector, I realized I didn't know how to test to replace the bad one. What make/model of engine are we testing, anyways?? Doxfords wouldn't use this kind of test: http://www.youtube.com/results?searc...y=doxford&aq=f If you are installing a used engine, and assuming it has a conventional Bosh or CAV type fuel system, I would suggest that you take off the injector pump and all the injectors and have them tested and calibrated. My experience is that every time I have done this the shop made some repairs to either the pump or the injectors - in other words there was something wrong that wasn't noticeable by listening to the engine run. Cheers, Bruce in Bangkok (bruceinbangkokatgmaildotcom) |
Diesels
"Bruce in Bangkok" wrote: If you are installing a used engine, and assuming it has a conventional Bosh or CAV type fuel system, I would suggest that you take off the injector pump and all the injectors and have them tested and calibrated. My experience is that every time I have done this the shop made some repairs to either the pump or the injectors - in other words there was something wrong that wasn't noticeable by listening to the engine run. SFWIW, my next door neighbor's SIL operated a diesel injector/pump repair shop. At least every 2nd year, would make a visit with my Yanmar parts in hand at the start of the season. They usually found something. BTW, Yanmar uses a totally unique system. Lew |
Diesels
Bruce in Bangkok wrote:
On Sat, 25 Apr 2009 15:30:21 -0700, Gordon wrote: I picked up a used W40 for parts. It was in a Tartan 37 and when he saw a light sheen of oil on the cooling fresh water, he decided to re engine. No smoke, no water in the oil, smooth running. Installation of a new Yanmar only cost him 18k! The W40 came with a new panel, spare alternator, upper end gasket kit, impellers, oil filters and a good spare injector. When I saw the spare injector, I realized I didn't know how to test to replace the bad one. What make/model of engine are we testing, anyways?? Doxfords wouldn't use this kind of test: http://www.youtube.com/results?searc...y=doxford&aq=f If you are installing a used engine, and assuming it has a conventional Bosh or CAV type fuel system, I would suggest that you take off the injector pump and all the injectors and have them tested and calibrated. My experience is that every time I have done this the shop made some repairs to either the pump or the injectors - in other words there was something wrong that wasn't noticeable by listening to the engine run. Cheers, Bruce in Bangkok (bruceinbangkokatgmaildotcom) I only got it as a parts engine. Mine still runs strong. Will still have the used parts tested. G |
Diesels
In article s.com,
"Wilbur Hubbard" wrote: "Gordon" wrote in message m... How do you know when you have a bad injector and how do you figure out which one it is? Gordon Remove the spark plug wire one cylinder at a time. The spark plug wire removed on the cylinder with the bad injector will not cause an additional miss. Wilbur Hubbard Jezze Louise, Wilbur, are you really this stupid? Spark Plugs on a Diesel Engine? There actually IS one design that does have this arrangement, but International Harvester hasn't built one in 50 years.... and when in Diesel Mode, the Spark Plugs are not used..... |
Diesels
You wrote:
In article s.com, "Wilbur Hubbard" wrote: "Gordon" wrote in message m... How do you know when you have a bad injector and how do you figure out which one it is? Gordon Remove the spark plug wire one cylinder at a time. The spark plug wire removed on the cylinder with the bad injector will not cause an additional miss. Wilbur Hubbard Jezze Louise, Wilbur, are you really this stupid? Spark Plugs on a Diesel Engine? There actually IS one design that does have this arrangement, but International Harvester hasn't built one in 50 years.... and when in Diesel Mode, the Spark Plugs are not used..... Ok Wilbur, I got the sparkplugs out of my Westerbeke diesel but I'll be damned if I can set the gaps. Can you help me please? G |
Diesels
"Gordon" wrote in message
m... Ok Wilbur, I got the sparkplugs out of my Westerbeke diesel but I'll be damned if I can set the gaps. Can you help me please? G The gap on Essie's diesel spark plug is about three feet. I keep the sparkplug in a drawer in the cabin, and it apparently works by induction, with no visible power source. I'm assuming it uses Zero Point energy. -- KLC Lewis www.cafepress.com/tmen www.zazzle.com/klclewis www.KLCLewisStudios.com |
Diesels
On Apr 26, 3:35*pm, You wrote:
In article s.com, *"Wilbur Hubbard" wrote: "Gordon" wrote in message om... * How do you know when you have a bad injector and how do you figure out which one it is? *Gordon Remove the spark plug wire one cylinder at a time. The spark plug wire removed on the cylinder with the bad injector will not cause an additional miss. Wilbur Hubbard Jezze Louise, Wilbur, are you really this stupid? *Spark Plugs on a Diesel Engine? *There actually IS one design that does have this arrangement, but International Harvester hasn't built one in 50 years.... and when in Diesel Mode, the Spark Plugs are not used..... My grandfather had one of those. It was actually a dual fuel engine. Gas was used to warm it up, after about 5 minutes you simultaneously shut off the gas and opened up the diesel flow, a two handed operation that took a bit of practice. |
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