Which will last the distance
Submitted: Saturday, Jan 05, 2008 at 11:15
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Stephen M (NSW)
Hi all, before I ask I'm not after a Toyota/Nissan/Mitsi debate. I'm having a discussion here with a mate and the question is : Would say a 4.2 t/d engine either cruiser/patrol outlast say a hilux/navara/mitsi any of the four cylinder t/d's when towing heavy loads say 1.5 to 2 tonne vans/trailers etc. I reckon the 4.2 t/d cruiser/patrols would outlast the others due to them been such a big lumpy motor and not as highly strung as I will put it as the 4 cylinder ones. My mate reckons the four cylinder ones will out last as they are high tech and in general have higher output in power/torque that they are not driven as hard and don't have the boot down as much. Yes I agree with him about the power stakes/torque in the smaller engines compared to some of the bigger ones but Im talking longetivety on the engine.Just wondering what the general consensus is on this. I'm talking t/d's only not petrol and presuming the vehicles have been
well serviced all the usual stuff. Regards Steve M
Reply By: Peter 2 - Saturday, Jan 05, 2008 at 11:51
Saturday, Jan 05, 2008 at 11:51
Yep, no substitute for cubes, a lazy motor with torque down low will always outlast a smaller engine working hard at the outer end of the envelope.
We have a typical example in the two Nissan motors, 6cyl 4.2 TD or 3 litre 4 cylinder which has had many failures.
Personally I'll stick with low tech as
well, less to go wrong and you are not travelling at the whim of a little black box. Also these common rail electronic injected engines seem to have difficulty with dirty fuel, dirty fuel = blocked injectors which need replacement at horrendous cost.
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Reply By: Member - Alan H (Narangba QLD - Saturday, Jan 05, 2008 at 11:57
Saturday, Jan 05, 2008 at 11:57
Longlivity is based on speed and torque band. A lot of 4cyl have to rev higher to reach an acceptable torque band.
Check out the torque band and engine revs.
My old 4.2 will pull all day sitting on 2400-2500 revs. Any engine moving at a fast rev will wear sooner. It has great torque if the rpm is kept 2000+
The toyota V8 has a torque band starting about 1200rpm
V8 racing cars at 7000-8000 rpm do not do 300-500k without work. They constantly rebuild them due to wear at high speed.
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Reply By: Neil & Pauline - Saturday, Jan 05, 2008 at 12:16
Saturday, Jan 05, 2008 at 12:16
Stephen
I had some concerns on the same lines but ended up buying 2004 Pajero DID. Why my decision was based on the fact that it had a long stoke (more torque) and slower reving. I have since met owners of 2 Pajeros that have done 400,000 and 450,000 klms.
I have done 130,000 klm towing 2.5tonne and very happy.
As to the number of cylinders the old motors like a Landz Tractor was only single cylinder and went for years. Admittedly a big cylinder. The Kobota motors are high reving but they are long lasting.
My conclusion is there is no standard answer but comes down to quality of materials, design and build.
Neil
AnswerID:
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Follow Up By: madfisher - Saturday, Jan 05, 2008 at 22:55
Saturday, Jan 05, 2008 at 22:55
Actually I have head of Lanz bulldogs doing 10000 hours and that was 50 years ago
Cheers Pete
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Reply By: Member - Barnesy (SA) - Saturday, Jan 05, 2008 at 12:24
Saturday, Jan 05, 2008 at 12:24
I would lean towards the larger 4.2. As others have said it doesn't have to work as hard to tow.
The 2002 turbo diesel Courier I've driven peaks out at 100 kmh and at 110 starts struggling and shaking around, without towing.
My 1991 4.2 GQ happily tows the fully laden CT at 100 kmh all day without raising a sweat.
It remains to be seen if these new high tech diesels will regularly get 5-600 000 km like the old big sixes often get.
Barnesy
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Reply By: Member - DOZER- Saturday, Jan 05, 2008 at 12:39
Saturday, Jan 05, 2008 at 12:39
To quote an old cow cokies words...."oh, a turbo....50% more power, 100% more problems...
Current climate, the 3 litre nissan is a steer clear, 4.2 is ok but oil louses up quick being indirect injection and power is down to the direct injection 3 litre and toyota.
The 4.2 factory turbo toyota motor should live 3/4 of a million kms without problems if serviced to the book (pump and injecters every 150k kms)...when towing the main thing to look for is high torque across the range, the 3 litre grapg looks like mount Kosiosko, the 4.2 looks like Ayers
rock profile...so out of those two, the 4.2 is the best tower with more torque available across its rev range.
Mitsubishi has always been the dark horse, with really strong diesels, the DID is a great motor, pumps dont like being ran out of fuel, a few have ceased to operate after this occuring the first time :( The rest of the drive line is what i think would let you down if towing alot.
Andrew
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Reply By: Member - Phil G (SA) - Monday, Jan 07, 2008 at 12:55
Monday, Jan 07, 2008 at 12:55
When is an engine worn out?? Used to be when you lost compression past the rings, or lost oil pressure etc
These days, theres a heap more expensive repairs to contend with. So when your 3litre Nissan TD spits its turbo, or your 3litre Prado cracks its cylinder head, or your injector pump doesn't like aussie fuel, or some sensor gives you grief, then you're up for a hell of a lot of $$$ - maybe as much as it used to cost for a new motor anyway.
My point is that I couldn't care less whether the rings/bearings will go 600,000k - its all the other repairs and reliability along the way that matter to me. My preference is for the 4.2l 6cylinder diesels because both the Toyota and Nissans have a long history of trouble free motoring.
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Follow Up By: Stephen M (NSW) - Monday, Jan 07, 2008 at 22:31
Monday, Jan 07, 2008 at 22:31
Hi Phil hows it all going. Yes agree with the ongoing running costs of the high tech motors. Mate had to replace his diesel pump on his 03 Hilux t/d 3 and 1/2 grand later due to bleep ty fuel. I have heard this lately about the prado heads, common problem ?? on that I presume your talking the earlier diesel not the D4D. Regards Steve M
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Follow Up By: Member - Phil G (SA) - Tuesday, Jan 08, 2008 at 19:07
Tuesday, Jan 08, 2008 at 19:07
Gday Stephen,
Re the Prado Heads, I've had 2 friends in
Adelaide have cracked cylinder heads on australian delivered 1KZ-TE motors - I don't think its a common problem - just the luck of the draw. And you've probably heard of other instances from the Prado groups.
D4D hasn't been around long enough in Australia yet.
But cylinder head problems seem almost unheard of on the 6-cylinder cast iron heads.
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