200 Series Turbo V8

Ring Toyota Australia and ask them what you should do... Tell them the dealers are not capable of servicing said vehicle.. Michael

Bob Y

Could this be the new generation 1HXXXX tick.
I hope they have more success with this tick.

I, along with many other 1HXXXX owners have been driven crazy by the legendary ticking noise.

Regards and best of luck.

for what it is worth - we have 2 x 200 TDV8 (leased - 1 x 12,000km and 1 x 18,000km now) and both have been in to the dealer for the now legendary oil and fuel consumption fixes. the 'ticking' noise was 'fixed' with new injectors - 8 on 1 and 4 on the other. ticking noise still there and will stay until the lease runs out (2yrs) as the 5 days off the road is just too much. 3 weeks ago we took delivery of another V8TD but this time the 76 - single turbo etc. for whatever reason no ticking noise - both 200 were evident from delivery. if the 76 is the same as other single turbo 76 we have it will not have any fuel or oil consumption problems. the issues with the twin turbo appear to be something toyota wishes/hopes will go away - sort of like nissan with the early 3.0l gu. having said that both the 200s get up and go and the 'noise' does not appear to have any effect on performance or fuel/oil usage. and the oil consumption has dropped as the kms increase but still nearly double the 76 consumption - maybe it is needed to keep the insides from exploding.
more completely useless info - so far both 200 are averaging 19.4L/100km and 18.8L/100km with the older 76 (21,000km) averaging 18.2L/100km. with the equipment fitted and weight carried and area they are used this is considered very acceptable. rgds

It may have something to do with either:-

The fact it is a V8

or

The electronically activated hydraulic injectors.

I say this coz my F 250 with the intercooled 7.3 V8 does just the same thing, and it shares those two design aspects with the new 200 series V8 twin turbos Cruisers.

It's had the rocker covers off a few times now and valve backlash adjusted etc etc, and it makes no difference - with no load the tick is there all the time and more pronounced when cold.

Its MY own opinion that the efect is in the V8 configuration... obviously the block being metal expands a fraction as it warms - in the case of a V8 it expands such that the V section causes a fractional distance atleration in the distance apart from each other of the two heads.

Where they run a centralised cam and pushrods - this affects the tappet adjustment...it's inherrant in the design (not so with ndividual overhead cams tho).

I could be wrong - but thats my pet theory for what its worth.

Pet theory number 2 is that if they are HEUI (Hydraulic Electric Unit Injectors) injectors - then you MAY have one thats noisy perhaps.

You could buy a new injector and place it into each cylinder in turn until the noisy one went away perhaps BUT these type of injectors arent CHEAP - like around $800 US each (over a grand Aussie) - so you can sdee why dealers don't just throw a few new injectors at the problem hoping it will go away.

Now.. how are the dealers diagnosing the engine in the first place?

Have they got the full computerised electronic diagnostic program and connector?

Or are they trying to do it by ear?

As best I know, your HEUI injectors work like this.

1st you have a normal oil pump in the engine just like everyone else and it makes maybe 100 psi oil pressure the usual displacement way that others do and oils the internals just as every other engine does.

2. This is where the new engines differ, they have a 2nd oil pump - called a HPOP (High Pressure Oil Pump) and it is much like a Jam Tin with maybe 8 metal hyperdermic syringes fixed inside of it. Its fed with eengine sump oil from the first oil pump. The end of the Jam tin HPOP has a jam tin lid welded onto it but at an oblique angle - not flat. The ends of the syringes are affixed to this "swashbuckle" plate that as it rotates - lifts the plungers up and down, as the oblique angle rotates, like a buckled wheel on a car!

3. This HPOP with it's individual syringes takes the used dirty sump oil, fed from the first normal oil pump at about 100 psi and tries to compress it, increasing the pressurre upwards of 2000 psi - to each individual injector!

4. The HEUI Injector has a further pressure increase of the oil by restricting its passage into a smaller gallery that takes the hydraulic pressure upwards of 20,000 psi!

5. The 20,000 PSI of haudralic pressure is then used to pressurise the diesel fuel - thus effectively atomising it. That 20,000 psi of pressure is released when the electronic signal reachess the injector from the controlling IDM (Injector Drive Module) computer.

6. The IDM computer tells the injector WHEN to fire, base on info the main computer gets from a magnetic camshaft position sensor fitted to the engine block.

The "ticking noise" can come from a HEUI injector where excess carbon (soot) deposits within the engine sump oil have accumulated/agglomerated & partially blocked the restrictor section in the injector where the oil pressures are increased from 2000 psi to in excess of 20,000 psi.

IF oil debris / soot or partial blockages, get into that section of the injector it is like the sound of a little man hammering away with a ball pein hammer - we are talking very high pressures here.

It IS one of the "possible downsides" of these new high tech engines - anyone whos worked with hydraulic machinery will tell you that keeping hydraulic fluids scrupulously clean, is paramount to long term performance and reliability of any hydraulic system. Any dirt or particles within a hydraulic system where high pressures are involved acts like a cutting paste and eats away metal at a great rate of knots.

This has to make one question, the "sense" in the very first place of using DIRTY black soot laden sump oil in a diesel engine as an hydraulic fluid to fire the injectors - no?

Especially when they are around a grand a piece and your engine uses 8 of them!

Now, when you think how important it is to keep the hydraulic oil clean of ANY particles that might cut away at the metals inside the injector when 20,000 psi pressures are involved, wouldnt you think the manufacturers wold go out of their way to filter that engine oil as finely as they could removing any soot particles down to below 1 micron with sub micron bypass filtration?

Its quite odd then that the new Toyotas (and My F 250) doesn't come standard with such sub microm filtration fittings - instead relying on the old standard oil filter that allows particles as large as 25 microns to keep circulating thru the engine, the oil pump the HPOP and the Injectors at pressures up to 20,000 psi?

I reckon its simply crazy myself, and what will happen to those who don't do supplementary filtration AND don't do regular frequent oil changes as well - those who let the oil get out to say 20,000 km's between changes because they have fully synthetic oil and the read somewhere that you can run extended oil changes out to 20,000 km's on this new miracle wonder oil?

How will their HEUI injectors hold up long term?... no problem just pop in 8 new ones ($8K thank you very much!).

I reckon as time progresses we will hear MUCH more about ticking noises from the cruisers (and the 7.3 liter F trucks) and start to hear screams of pain from those replacing injectors at early km's.

I could be wrong (I was once) ;o) - but Me? - I've fitted sub micron bypass oil filtering, just in case to try and minimise that annoying ticking noise from the HEUI Injectors!

The landcruiser folks will have to work this one out for themselves just as I did with the F truck engine - a little research will go a long way I reckon in that regard.

It's going to take a wee while until enough 200 series deisels are out there with enough KM's omn them and until enough technicians stat to pull them down etc before the real issue comes to light IMHO.

Meanwhile the ticking won't kill it, but it might well drive you nuts!

Welcome to the new technology diesels where they require good electrics to make them run - wait until your IDM gets wet in a water crossing and the whole "reliable / will run under water with a snorkel" engine quits at the first decent shower of rain, coz the electric signals shorted out, and couldn't tell the injectors when to fire - yep this new technology will be Soooo reliable!

But don't take my word for it - buy one and learn from experience!

Cheers

Many thanks to all the comments from members re the 200 series ticking noise. How interesting that members are aware there is a problem but not Toyota, sounds like the response from nissan re their 3 litre engine.
Regards Bob