105 GXL Landcruiser auto 1HZ with aftermarket Denco Turbo kit

Submitted: Friday, Mar 09, 2012 at 20:43
ThreadID: 92414 Views:7398 Replies:5 FollowUps:8
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I bought this vehicle with 318 000 km on the clock unbenown to me at has iether a crak head or broken headgasget. I did fit a DTs interkooler before I realised it has had a problem. It forrced compression into the radiator cooler and water into the auto gearbox cooling sustem.
I need to replace the auto gearboc, radiotor and rebuild the engine.
Is there a aftermaket head kit that will handle the extra heat that's generated by the intercooler and turbo kit.
What about exhuast upgrade what is the best thing to do now or do I replace the whole engine with a FTE turbo diesel?
Can anyone gice some advice?
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Reply By: Dreadnought - Friday, Mar 09, 2012 at 21:59

Friday, Mar 09, 2012 at 21:59
Advice?..........Spell check..............
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Follow Up By: Bonz (Vic) - Saturday, Mar 10, 2012 at 08:12

Saturday, Mar 10, 2012 at 08:12
Anything useful to add?
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Reply By: Member - Royce- Friday, Mar 09, 2012 at 22:14

Friday, Mar 09, 2012 at 22:14
Gday Hercules S...

It's a bit hard to read your post!

My vote... Start with a replacement engine....
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Follow Up By: Member - Krakka - Sunday, Mar 11, 2012 at 13:13

Sunday, Mar 11, 2012 at 13:13
We're not all school teachers here!! You can't read English?

That's not too hard to read.

But I will agree, replace the engine if that is an option for you Hercules S
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Follow Up By: Member - Royce- Sunday, Mar 11, 2012 at 15:17

Sunday, Mar 11, 2012 at 15:17
Fair point Peter.... but then there's the situation where someone doesn't have the courtesy to make an effort.

Not 'too hard to read' ... just 'hard' to take.
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Reply By: Ross M - Friday, Mar 09, 2012 at 22:47

Friday, Mar 09, 2012 at 22:47
I can't see how the compression pressure would find it's way to put water into the gearbox even though the gearbox cooling heat exchanger is in the bottom of the radiator. Never heard of than before.

Once you have the head gasket problem sorted it should be ok to use into the future if all mechanicals and the head and block are good. If you don't punish it and use it properly then all will be ok.
It isn't the heat so much as the extra combustion pressure the turbo creates that is the problem.
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Follow Up By: Whirlwinder - Saturday, Mar 10, 2012 at 07:55

Saturday, Mar 10, 2012 at 07:55
Yes Ross, I agree. I have a 1HZ with aftermarket turbo and has run faultlessly for 150K BUT I don't have a intercooler.
It is important to keep boost to less than 10 psi and jut be happy with the improvement the turbo itself gives and get rid of the intercooler.
Now, let me see......nah, no need for spell checker here!
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Follow Up By: Bonz (Vic) - Saturday, Mar 10, 2012 at 08:13

Saturday, Mar 10, 2012 at 08:13
How does the intercooler increase the pressure?
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Follow Up By: fisho64 - Saturday, Mar 10, 2012 at 17:44

Saturday, Mar 10, 2012 at 17:44
it doesnt Bonz except that people try and increase the boost to show that the intercooler is doing something. In reality an air to air at 10psi boost wont be doing much on a hot day.

ditto the tranny cooler, impossible unless the cooler itself was leaking. Personally I wasnt aware that the 1HZ was mated to an auto? That would be a real slug standard?
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Follow Up By: Bonz (Vic) - Saturday, Mar 10, 2012 at 20:50

Saturday, Mar 10, 2012 at 20:50
Yep sure would be a slug
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Reply By: nick - Saturday, Mar 10, 2012 at 13:35

Saturday, Mar 10, 2012 at 13:35
Been there done that in regards to a 1HZ with A/M turbo, I now own a totally stocked engine 1FZ FE Petrol.
If you want long term reliability from a turbo'd 1HZ, you have to keep EGT's(exhaust gas temperature) as low as possible. To do this you NEED an intercooler, you need your pump and injectors in A1 condition, you need your cooling system in 100% working order, your pump timing set correctly and fuel mixture correct. Some may also say a boost compensator although I never did and has great temps.
Personally, I wouldnt go down that path again, go for a 1HD FTE conversion, much better engine thats designed for a turbo and relatively easy conversion these days. And by he time you rebuild your engine your well on the way to your conversion.
And a turbo increases your temps., a intercooler will help decrease them.
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Reply By: ross - Saturday, Mar 10, 2012 at 14:39

Saturday, Mar 10, 2012 at 14:39
What you need to do is fit an Exhaust Gas Temperature (EGT) gauge so you know how much heat the engine is generating.
There is no heat resistant head gasket or kits,the only thing you can do is avoid generating the heat by watching the gauge and easing off when its gets too hot.
The probe or sensor for the gauge is fitted by tapping a hole into the exhaust manifold

Usually its the pistons that aftermarket turbos are most likely to damage on a 1HZ,they are too thin to cope with the heat a turbo can make and unfortunately ,the companies that sell these aftermarket turbos are a bit quiet on the issue.
There are turbo pistons for the 1HZ available from a company in South Australia called Engines Australia that are thicker and heavier than the stock pistons.

You may also want to see a diesel injection shop about getting your fuel pump checked to see if its overfuelling,this can also cause excess heat.
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Follow Up By: Member - Trevor Phillip K (INT - Saturday, Mar 10, 2012 at 15:58

Saturday, Mar 10, 2012 at 15:58
I fitted an A/M turbo to a 1HZ when it had 160 000 on the clock, Had the job done by Turbo Glide in Woolongong. The vehicle now has around 400,000 klm behind it and is still going strong. These engines will go forever with or without a turbo, if they don't get flogged or overheated. Sounds like Herc S was unlucky enough to get one that has been belted to death. Put in a new/recon donk or do up the old one? Watever you do mate, it is going to cost you a packet. I'd fix the engine first, and replace the radiator, then look at how the trannie got water in.
Always do right. This will gratify some and astonish the rest.

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