100 Series 1HZ injector failure

Submitted: Friday, Jul 29, 2005 at 10:48
ThreadID: 25154 Views:5658 Replies:6 FollowUps:2
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I became aware of a faulty injector on my Cruiser when the engine began running roughly at 113,000km. I checked the injector lines for air & noticed that when number 1 line was cracked open there was no difference to performance, unlike the other cylinders. I probably did a further 15km before not being able to see the vehicles behind due to a massive cloud burst of smoke. Further diagnosis has revealed number 1 piston has a hole & is cracked from one side to the other.

Has anyone else had this happen and how do we get on in the desert if an injector were to jam open?

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Reply By: 120scruiser - Friday, Jul 29, 2005 at 10:58

Friday, Jul 29, 2005 at 10:58
Is there an after market turbo fitted?
AnswerID: 122682

Follow Up By: Seto - Friday, Jul 29, 2005 at 14:26

Friday, Jul 29, 2005 at 14:26
Yes there is an aftermarket turbo.

FollowupID: 377897

Follow Up By: 120scruiser - Friday, Jul 29, 2005 at 16:42

Friday, Jul 29, 2005 at 16:42
I would say your EGT (exhaust gas temperatures) were too high causing over fueling. 1HZ engines are known for this. They run different pistons to the 1HDT and different head.
When you have it rebuilt have the pump recalibrated to standard plus 7%.
I strongly advise you fit an egt guage and don't exceed 500 degrees celcius.
Get in touch with a sponsor of this site, Denco and they will be able to help you out but for the basics the egt is set running at full throttle under load for 2 minutes and the egt temp shouldn't go over 500 degrees. That is with the probe in the dump pipe straight after the turbo.
Another good source is Ian at THERMOGUARD I had one of his guages in my 80 series and they are great. Alot cheaper than rebuilds.
FollowupID: 377912

Reply By: Rigor - Friday, Jul 29, 2005 at 11:07

Friday, Jul 29, 2005 at 11:07
Hi David , bad luck . Just a thought , I presume that you are blaming the stuck injector for damageing the piston . I always look at situations in the reverse to most people (I love an argument ) What I am suggesting is the piston failed (lack of compression therefore missing) and no difference when the injector cracked .
The injector may be fine , only way to prove is to swap with another cylinder or get it checked.

Good luck with the rebuild.

Cheers Dave L.
AnswerID: 122687

Reply By: GUPatrol - Friday, Jul 29, 2005 at 11:33

Friday, Jul 29, 2005 at 11:33
Faulty injectors ie: bad spray pattern will damage a direct injection diesel engine, it will crack pistons, hole pistons and damage compression rings.

On an indirect injection diesel it is much more unlikelly but over a length of time it will damage it too.

Having said that, before all that happens you can easily hear a bad diesel knock coming from that piston (described more like a loud tapping noise)... caused by the poorly working injector...

That is why it is so important to keep an eye on injectors and do them every time the engine starts to get noisy.

Your second question, injectors don't usually jam open but if you get a bad injector in the desert (unlikely that this will happen suddenly) there is not much you can do.

AnswerID: 122691

Reply By: Exploder - Friday, Jul 29, 2005 at 17:01

Friday, Jul 29, 2005 at 17:01

I am guessing that a stuffed injector will be the lest of his worry’s at the moment as he is looking at a possible short motor rebuild to the tune of something like 10,000 big ones.

I would be looking for a written off land cruiser with the 1HZ diesel in it, rip that engine out and put it in your’s (Possibly a lot cheaper) you may even find a Turbo diesel.

AnswerID: 122737

Reply By: at4x4 - Friday, Jul 29, 2005 at 19:08

Friday, Jul 29, 2005 at 19:08
Contrary to popular belief, pump and injectors on any diesel inc 80 or gq on should really be checked at maximum 100,000km intervals, as part of the vehicles service life, because when the 2 models above were released, simplistic diesel parts lasting as long as the engine were no longer required neccasary by the manufacturers.
AnswerID: 122756

Reply By: 120scruiser - Friday, Jul 29, 2005 at 21:22

Friday, Jul 29, 2005 at 21:22
Try jap import. You can probably pick up a 1hdt for about 7500 - 8000 grand. Will be similar price for a rebuild.
Just a thought
AnswerID: 122788

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