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Post by crackers on Dec 16, 2006 21:48:04 GMT 11
Hi, the turbo in my 95 Bighorn 3.1d has just started a noticeable high pitched whistling noise.Its not a horrible noise, but its just that you never use to hear it at all apart from when you turned it off and you could hear it wind down for about 2 - 4 seconds.The trucks only done 95k and I've owned it since 50k, been serviced every 5000k using Fuchs ultra-lube 15-40 oils and has never missed a beat.I have taken off the intake hose and checked the impeller and there is no movement in the bearings and it seems to spin freely.Does anyone know why it may have started this noise all of a sudden and is it anything to worry about ? Cheers.
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Post by francesco on Dec 16, 2006 22:43:33 GMT 11
does it make the sound even on idle?
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Post by geeves on Dec 17, 2006 7:09:29 GMT 11
hate to tell you this but unfortuanatly the end is nigh.
The turbo on most of the 3.1s had a internal heatsheild that was too thin for the job and will generaly fail about 100000km. Its also not rebuildable due to the ceramic bearings.
The noise it used to make on shut down is the first sign of impending doom but some will go a year or more makeing this noise others wont make a week. When it fails completly it will either sieze suddenly with a substantial loss of power and noise or it will loose a seal on the exhaust side causeing major oil smoke. They have been known to break off blades causeing engine damage or loose a seal on the intake side resulting in the engine running on oil which results in an uncontrolable engine but these are very rare.
When you replace the turbo if you buy second hand you might be buying the same problem unless you can get the slightly smaller 2.8 turbo(you also need some of the manifold parts) which goes ok but you do loose a little power If you buy new get the later model turbo that has gone back to replaceable ball bearings
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Post by crackers on Dec 17, 2006 11:10:50 GMT 11
Bugger!Sounds bad!Ok looks like its time for a new turbo.What sort of money are we talking and does anybody know of a good place to find all the bits I need?Cheers.
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Post by geeves on Dec 17, 2006 17:05:43 GMT 11
New 800 - 1000 = fitting. Theres a good place in CHCH that mudgrip will be able to recomend but thats still a long walk from central otago
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ken
Isuzu Junior
Posts: 87
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Post by ken on Dec 21, 2006 7:14:35 GMT 11
Jumping in on the subject.
My 94 Bighorn has is developing the dreaded whine on shutdown. Will my model have ceramic bearings or be serviceable.
Ken
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Post by geeves on Dec 21, 2006 19:16:58 GMT 11
bad luck sorry
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Post by caffa on Dec 30, 2006 12:45:38 GMT 11
hey I am in on this too ... I am waiting for the day mine dies which I think will be sooner rather than later. Have had a good whistle on shutdown for 6 months or so. Now in the last couple of weeks, I can hear it on the highway at 110 equally as loud as the engine when I have the window down...
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Post by geeves on Dec 30, 2006 14:52:51 GMT 11
some dye within weeks of makeing this noise some take much longer. Andrew got 18 months from his then it lost the seal and disappeared in a puff of smoke
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Post by billyvanboheman on Jun 7, 2007 7:31:53 GMT 11
If you buy new get the later model turbo that has gone back to replaceable ball bearings The turbo on most of the 3.1s had a internal heatsheild that was too thin for the job and will generaly fail about 100000km. Its also not rebuildable due to the ceramic bearings. Does this include the 1996 Wizzard 3.1's |
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Post by geeves on Jun 7, 2007 12:59:32 GMT 11
yes
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mu4meandyou
Isuzu Junior
Accept what you can't change and change what you can't accept
Posts: 55
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Post by mu4meandyou on Aug 11, 2007 22:45:54 GMT 11
Don't want to let people think they're alone :-) My 2.8 has the high pitch whistling noise and starting to blow more smoke than I'd like (varying in colour and quantity). Geeves you mention the 3.1 turbo is not rebuildable, does that mean mine would be ? Out of a 91. Hopefully rebuildable = cheaper.
I also have a complete 93 MU that's not currently registered and the turbo seems OK, I need to decide if it's worth swapping them, or just bite the bullet on a rebuild. I assume they are exactly the same. History basically unkown on both trucks. There doesn't seem to be much involved with removing them - are looks deceiving or any tricks I need to know?
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Post by geeves on Aug 12, 2007 13:42:24 GMT 11
91 should be the earlier turbo so worth haveing an expert have a look and quote for repair. The turbos are interchangable so worth a go. Removeing is simple but not as much room as you would like
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mu4meandyou
Isuzu Junior
Accept what you can't change and change what you can't accept
Posts: 55
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Post by mu4meandyou on Oct 16, 2007 22:43:30 GMT 11
Well I can confirm that procrastinating doesn't change the condition of your turbo  Was about 5 kms from Sydney CBD when the high pitched (bearing type noise) become considerably louder and lost most of the boost. Within a very short time the smoke screen mentioned by Geeves occurred. I limped it off Parramatta Rd into the back streets and called for a lift the 50kms home.... Long story short I now know what Geeves was talking about having less room than you'd like changing turbos. I raced home and took the turbo of the spare MU which seems to be in good condition. Early next morning I loaded the boot with tools, drove to the sick MU and performed a roadside Turbo change. Took a fair while but nothing some patience and expletives couldn't fix. Those design engineers must have small hands/fingers. The old turbo is totally stuffed with 2-3mm play. Actually the nut holding the intake impeller on was loose. Could have been a lot worse. On the up side at least I know I got the last I could out of it. Once changed, it took a long time for all the oil to clear from the blown turbo but now seems to be boosting right and making the right noises on the drive home. Now need to investigate IHI turbo rebuild kits. Moral to the story - when you suspect a problem it's best to fix it when it's convenient rather than get stuck on the side of the road and waste a weekend...... |
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Post by powertruck on Oct 17, 2007 8:03:55 GMT 11
Hey i can supply a brand new Replacment turbo for your bighorn for $895+ comes with 12 month warranty Its the superceeded turbo for this model IHI VICC
Visit our website turbocare.co.nz
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Post by powertruck on Oct 17, 2007 8:08:19 GMT 11
Just some advice to you guys about isuzu bighorn / Mu turbo's from 1991 thru to 1996 isuzu had a big problem with there turbo's the heatshield lets go in behind the turbine wheel. When this happens one of 2 things can happen. Firstly they develop a high pitch whistle this is due to the rotating assembly getting out of balance due to the heatshield clipping it. Secondly the turbo will lock up and the vechile will black smoke and be down on power.
The 2.8 4jb1 runs a smaller exhaust housing 12R compared to the 3.1 15r but the Vicc runs a 17r housing but more efficient turbine wheel.
Just be wary about buying 2nd hand isuzu bighorn turbo's as they are prone to failure. if you do go down the track make sure you remove the exhaust housing and check the turbine wheel and heatshield
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Post by deeppurple on Jan 2, 2008 17:07:49 GMT 11
Darn it my '96 wizard 3.1 turbo started singing towing the boat over the weekend.It now whines after turning off the engine as well.It looks fairly easy to access (compared to a surf I used to own) what sort of labour time is involved to remove and replace the turbo? Cheers.  |
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ken
Isuzu Junior
Posts: 87
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Post by ken on Jan 2, 2008 19:06:16 GMT 11
A turbo shop in Christchurch told me the do a change in 4 hours. It took me much longer than that and I had no broken studs.
Ken
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mu4meandyou
Isuzu Junior
Accept what you can't change and change what you can't accept
Posts: 55
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Post by mu4meandyou on Jan 3, 2008 0:07:41 GMT 11
With all the right air tools you could probably do one in 4 hours however like Ken mine took a little longer. Would be able to do another one quicker though :-)
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Post by Roger on Jan 11, 2008 13:53:13 GMT 11
When I first got my 3.1 MU, it made no wind down noise after shutdown. Not long after it started making the noise and continues to make that noise and still whistling on full boost at least 4 years and 100000km later.
I even had it checked out a few years back by a turbo specialist and he felt movement in the impeller.
When the day comes, it comes!
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Was about 5 kms from Sydney CBD when the high pitched (bearing type noise) become considerably louder and lost most of the boost. Within a very short time the smoke screen mentioned by Geeves occurred. I limped it off Parramatta Rd into the back streets and called for a lift the 50kms home....
