Yes, lack of details is intentional, just want open minds currently.
budgel,
Jan 2, 7:21pm
Given that the other bearings seem to have normal wear, missassembly after a rebuild some time ago, or a blocked oilfeed to that bearing.
skull,
Jan 2, 7:21pm
Lack of oil pressure to the bearings coupled with running it rather longer than they should have with the noise I'm sure it would have been making.
m16d,
Jan 2, 7:22pm
Oil. ?
snoopy221,
Jan 2, 7:33pm
bearing failure? Its a Isuzu 4JG2 3.1 TD in a 97 Bighorn. import lack of oil changes done what 300 thousand kilometres. Evidence of low oil pressure showing on most bearings as the top high load bearing damage and evidence of acid build up in oil due to bearing disintegration. Fact is later model turbo diesels are OFTEN standard diesels with turbos added and bearings ARE a maintenance item Toyota 1HDT is a classic example throw a set of shells at it every 100 k and all good. NOTE- that journal on the crank that really spat the bearing WILL be out of round
intrade,
Jan 2, 7:36pm
more like lack of it its rooted non of the bearings have normal wear they are all phuked. including the crank
morrisman1,
Jan 2, 7:49pm
I am aware its phucked, was driving then knock knock knock, no place to pull over safely with a salvage trailer behind because of roadworks so had to continue a couple km up the road, so damage was probably made worse by that.
It had been rebuilt by a crowd in tauranga about 100,000km ago. Has been in the same owner since and I don't have any question that the maintenance intervals were not followed, he is quite methodical about that stuff. Was on royal purple 15w40. Recently switched to a fuchs 5w30 on the recommendation of some mechanic (I dont know the full story).
Oil pressure was normal to the point of failure.
It's likely the thing will be junked, but we do want to find the probable cause, and price fixing the engine so it can be worked out if it's financially viable to do.
franc123,
Jan 2, 8:10pm
Yikes I never would have put oil that thin in one of those, 15w/40 is what should be in it. If this replacement oil was a full synthetic and it was previously running mineral, well say no more.
intrade,
Jan 2, 8:19pm
my old diesel all run valvoline Diesel extra 15w 40 on older non electronic crapola diesel engines.
they're all showing delamination in the top bearing shell, acidification coupled with too light an oil perhaps, either that or the pump drive sheared off and because you had to keep driving it has ripped the top shells to bits
supernova2,
Jan 2, 8:38pm
Fuch's recommend CFX15W40
morrisman1,
Jan 2, 8:51pm
I don't doubt the oil has played a part, The question would be is it completely to blame or were the bearings already buggered and the thin oil tipped the #2 one over the edge.
Oil pump drive is OK, still had pressure but none at idle once the being had gone. What is acidification about?
tweake,
Jan 2, 8:53pm
the other thing with a lot of the japs is the cooling system. simply running to hot and getting the oil to hot. combo of to hot and thinner oil. 5-30 would be fine in winter but towing in summer.
can you find exactly what oil was used? may have been using car oil. royal purple doesn't say what specs it is. car oils are typically low TBN and don't handle the acids from the older style combustion very well.
ema1,
Jan 2, 9:18pm
The mechanic who recommended 5w30 grade oil needs to be shot at dawn morrisman. Quite likely lack of oil changes some stage during it's life time could explain acidity evidence, overheating engine on towing in hot weather combined with light oil is a recipe for disaster. I would be my guess that it would have been suffering from a degree of wear and tear and possibly over heating to some extent plus the light oil and the towing work finished it off. I would suspect lubrication system could have been breaking down too . as in gallery blockages etc? Another engine would be the best option for getting it going again, fixing existing engine would possibly NOT be viable proposition.
i want to see what the cam looks like top normally suffers first post immage of cam shaft
mohaka,
Jan 2, 11:09pm
Going to a thinner oil would have caused more wear at start up compared to the original grade.How long where you running it on the new oil until this happened.Prolly not a wise move to go to a lower viscosity oil on a worn engine.
desmodave,
Jan 2, 11:52pm
Bottle of engine flush used before oil change , blocking oil passage . Do you have an idea what caused it ?
strobo,
Jan 3, 1:43am
(The bomb) Simply lack of frequent oil changes ( as mentioned aboved by others) incl the oil filter, bypass valve opens up and passes unfiltered oil thru the engine (loose carbon).probably along with localized overheating , poorly maintained cooling system, Airfilter,abrasives ,worn out inj/pump ,smokey POS,fuel thinning out the engine oil ,worn turbo + seals bypass oil into engine slightly increasing combustion ratio more load on bearings , etc.Those Isuzu engines can be quite forgiving but there is a limit!l a fully rebuilt engine is a costly option or reconditioned is really just a patch up job. but they rebuild well. liners ,pistons ,turbo the whole works . not cheap & hardly worth the money. scrap the blardy thing!
morrisman1,
Jan 3, 4:33pm
Lack of oil changes was NOT a factor, this engine was well maintained since its rebuild approx 100,000km ago.
It did about 2500km on the new oil type before going bang.
Injector pump had been rebuilt shortly after engine build, it ran nicely, not a rocketship but never a puff of smoke. Leaked oil but that was a seperate issue.
It currently looks like the owner is going to scrap it, well sell it as-is for someone who might want to tackle the project. I think its a heap of shyte and should go but not being mine it's not my decision.
m16d,
Jan 3, 5:03pm
OK. then it may have had a dose of petrol in the tank at some stage in it's life that has hammered the shit out of the big ends. People that do that tend not to tell anyone.
snoopy221,
Jan 3, 5:12pm
since its rebuild approx 100,000km ago. Ya forgot to add DULUX rebuild. pulled enough 100000k big ends outa diesels and changed em. Post the damn original isuzu part numbers written on the back of the bearing . K
Toyota 1HDT is a classic example throw a set of shells at it every 100 k and all good. EDITED to add have pulled a 100000 k set out of a 1HD-T that HAD been reconditioned 100000 k's before AND the clowns had clearly NOT left the glow plugs out and got oil pressure BUT had fired it up dry-you could see the bruising on the bearings. However minimal bearing disintegration. More bruising from a dry fire up
gamefisher,
Jan 3, 6:34pm
5w30 grade oil in a diesel towing in summer say no more.
tweake,
Jan 3, 8:07pm
you might be right there. as long as you maintain above minimum pressure, thin oil works better than thick oil. better at startup to. thats all due to more oil flow.
i wonder if bearings where not installed tight enough or simply not good enough quality. the synthetic oil might have been inadvertently saving the bearings. different oil, bearings run a bit hotter, bearing overheats while under heavy load.
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