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TROUBLESHOOTING, Site & Sound Video of D311 Genny EXHAUST under load
TROUBLESHOOTING, Site & Sound Video of D311 Genny EXHAUST under load
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4 years 4 months ago #217027
by ag-mike
1 minute video, COMMENTS PLEASE FROM SKINNERS THAT KNOW SITES AND SOUNDS.
Got a 15kw load on this machine with 650 original hours and prolly ain't had a load on it in 40/50 years. Its running at 1200 rpm. It was not locked up when i got it, plus the fuel capsules were removed, visually inspected BUT not tested. It don't wetstack at all. TIA
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4 years 4 months ago #217041
by ccjersey
I think I would put a set of injectors in it. Only other thing I would be concerned about is if one cylinder was worn enough that compression was marginal and causing a random misfire.
Once you get the new injectors in it, if it still puffs the smoke like that you can cut each cylinder out and try to find the one that makes it change the least. If you somehow make it worse, then you’ll know one of the new capsules is bad.
D2-5J's, D6-9U's, D318 and D333 power units, 12E-99E grader, 922B & 944A wheel loaders, D330C generator set, DW20 water tanker and a bunch of Jersey cows to take care of in my spare time:D
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4 years 4 months ago #217050
by ag-mike
Its definite blue smoke when not at load or max rpm. But it seems to random misfire with puff of mostly blue smoke quite often when at half throttle and less. When i got this i first pulled the capsules and added thin oil to the cylinder bores then barring engine over for months adding oil often. I was really surprised it wasn't locked up from sitting for 20 years. When running at 1200 its hard to tell if its blue smoke or white (mix of both?). It don't wetstack even with hours running at low rpm. I did a finger compression test when the capsules were out and all seemed/guessed equal. The airfilter w/precleaner has been maintained. i'm gonna start with capsules. I got a buda handpump injector tester i'm gonna rig somehow. thanks
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4 years 4 months ago #217053
by Old Magnet
I'd kind of suspect stuck rings (oil rings?). Runs but fires off the excess oil getting past the rings. Pull the exhaust manifold and check which cylinder/cylinders are the culprit.
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4 years 4 months ago #217055
by ag-mike
I'd kind of suspect stuck rings (oil rings?). Runs but fires off the excess oil getting past the rings. Pull the exhaust manifold and check which cylinder/cylinders are the culprit.
Easy enough when it warms up around here. Here is less than 20 miles south from the arctic region known as lake michigan. When the wind is from the north my skinny ass shivers the timbers.
thx.
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4 years 4 months ago #217077
by ag-mike
MISFIRE..... When starting from cold it fires off for a instant when i engage compression, sometimes kicking out the pinion. (fuel off as per manual)
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4 years 4 months ago #217104
by edb
Hi ag-mike,
false start could be a sign of a dribbling injector in that if the needle valve in the nozzle did not fully close off even the fuel transfer pump pressure could dribble some fuel into the cylinder on de-compression.
Misfiring can also be a sign of a leaking injector as combustion gasses are forced back into the fuel system and so make the engine misfire hard to detect to a particular cylinder until you crack and bleed off the injected fuel to the faulty injector--if there is more than one faulty injector it gets harder to detect which is the culprit--testing with an injector tester is the way to go or screw the nozzles back onto their adapters and fuel injection lines and keeping away from the spray, as it can penetrate your skin and make you very unwell or worse--check the spray patterns on engine by cranking it over with the fuel rack full on.
Another thought that with your climate could be to check your air cleaner system for restriction--paper element if wet and part frozen could be a restriction point.
As OM said, I also would suggest to remove the exhaust manifold if the injectors test OK, and see what you can tell us then.
Cheers,
Eddie B.
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4 years 4 months ago #217122
by Old Magnet
Could also be firing off leaked lube oil instead of diesel fuel which kind of goes along with the blue smoke.
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TROUBLESHOOTING, Site & Sound Video of D311 Genny EXHAUST under load
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