HJ75

[Brizcruza]

Hi all, Firstly - located Brisbane

I have an 88 HJ75 with an after market turbo system. No intercooler. I have a number of questions.

1 - I ahev an oil cooled turbo system, oil cooler is in the engine bay and as such recieves no direct airflow - has been like this since before i bought it. I have recently bought a new one to mount in front of the radiator. It is very similar to a thin intercooler in shape and apparance - should I get an aftermarket oil pump to help the factory one? My old 2H has done 450K so is stating to get a little tired.

2 - my fuel economy has recently started to decrease - I am only getting around 400-430km out of an 80L tank. My tires are not particularly aggressive - 33" mickey thompson baja atz 4 ribs. Any ideas on how I can improve that. I was told to run 2 stroke oil in with my fuel ast helps to lubricate the diesel pump - old diesel fuel have higher sulpur concentrations which helped in lubrication and that has been slowly reduced - hence the 2 stroke oil to help. Any other ideas to increase. I know injectors will be due soon and a possible rebuild for the injector pump - in that scenario, anyone know somewhere in brisbane that comes recommended for diesel injection?

3 - the old 2H gets hot sitting on 100km on ths hghway - fine around town and when having a play. its just getting to the playground and back again that it is the hard part.

4 - need more flex in the old leafs - The cruiser used to be a work truck and unloaded has a rock hard ride - it will be a play truck so de-leafed suspension will be the go - what some of leaf pack combinations would give me a good tradeoff between good handling on road and off?

5 - Drop shackles in the rear - I am told by superior engineering that I need a ladder rack for the ute if I am to install drop shackles - however, an friend of my has a 2000 model HZJ and he does not have one - thoughts?

NEED HELP

Thanks in advance.

Dean

 

[Cmoney]

2 stroke oil aditive

I to have the same question about adding the 2 stroke oil to lubricate. Mine is a 1985 2H with 350, kms. How much 2 stroke do you add per filling?
Good Questions and waiting for the experts!

 

[roscoFJ73]

Hi all, Firstly - located Brisbane

I have an 88 HJ75 with an after market turbo system. No intercooler. I have a number of questions.

1 - I ahev an oil cooled turbo system, oil cooler is in the engine bay and as such recieves no direct airflow - has been like this since before i bought it. I have recently bought a new one to mount in front of the radiator. It is very similar to a thin intercooler in shape and apparance - should I get an aftermarket oil pump to help the factory one? My old 2H has done 450K so is stating to get a little tired.

2 - my fuel economy has recently started to decrease - I am only getting around 400-430km out of an 80L tank. My tires are not particularly aggressive - 33" mickey thompson baja atz 4 ribs. Any ideas on how I can improve that. I was told to run 2 stroke oil in with my fuel ast helps to lubricate the diesel pump - old diesel fuel have higher sulpur concentrations which helped in lubrication and that has been slowly reduced - hence the 2 stroke oil to help. Any other ideas to increase. I know injectors will be due soon and a possible rebuild for the injector pump - in that scenario, anyone know somewhere in brisbane that comes recommended for diesel injection?

3 - the old 2H gets hot sitting on 100km on ths hghway - fine around town and when having a play. its just getting to the playground and back again that it is the hard part.

4 - need more flex in the old leafs - The cruiser used to be a work truck and unloaded has a rock hard ride - it will be a play truck so de-leafed suspension will be the go - what some of leaf pack combinations would give me a good tradeoff between good handling on road and off?

5 - Drop shackles in the rear - I am told by superior engineering that I need a ladder rack for the ute if I am to install drop shackles - however, an friend of my has a 2000 model HZJ and he does not have one - thoughts?

NEED HELP

Thanks in advance.

Dean

When engines get old they often run hotter.Someone told me it was due to wear in the engine creating more friction.
I would get it compression tested to see just how bad it is.

I doubt 2 stroke oil is going to help an inline pump with 450k on it .At 450k it has well and truly done its job,it maybe the reason you are losing power if its not low compression.

Are the leaves in your suspension flattened out? If so removing some to improve flex will not work.
You might be better off with all new leaf packs.
Lots of 75 series owners use drop shackles without ladder racks but you have to take it easy when they are unfolded,you cant do 80mph across bad ground
Try them without ladder rcks and see what happens.

 

[Brizcruza]

Compression is still good, all cylinders were around 320-330 psi.

I have been told 1-400 is a good ratio for the oil - apparently the 2 stroke burns hotter than diesel which helps give a cleaner and more stable combustion - more efficient use of fuel = more power right?

Also - I am planning on reducing the length of my exhaust pipe - having it dump about 300mm past the cab and aimed straight down - how will this affect my fuel consumption and torque. Because my understanding is that with the aftermarket turbo system, exhaust scavenging is not an issue as well as back pressure. So am i correct in thinking that a shorter pipe, with less pressure will allow faster spool-up of the turbo, making the truck more responsive and possibly increasing my low-down torque

no still good curve in them as well as shackle angles. getting some extended shackles for front soon with 3 degree castor wedges to ensure correct wheel alignment .

Can you point me in the direction of some owners without ladder racks - would like to hear about on and off-road performance?

 

[Gary Vansleve]

Rocklea Diesel and give Walter Vrbancic a call also the Diesel Shop in Browns Plains are the go. You could be looking at between $1500 - $2000 for rebuilt injectors and pump.

Unfortunately the old diesels start to get pricey and when they start getting tired you sometimes can get caught between a rock and a hard place as to whether to start pooring money into them.

A turboed 2H definitly needs a tip top cooling system to survive would look into the overheating issue.

If the exhaust system is in good nick and standard issue shortening the lenght of the pipe won't do much other than a headache ha ha. If modified there will be some small benefit.

Cheers

 

[Brizcruza]

Yes I am finding out the hardway - rock and a hard place for sure. I will definitely contact then in the next few days for a chat.

What can I do for for the cooling system? I hav replaced the radiator and the viscous clutch fan is still very firm. Possible secondary aftermarket water pump? i am putting a 14" thermo on the from of the radiator to push in whilst the clutch pull in. Any other ideas as fac as keeping those EGT's down. I have a pyro installed and most it gets up to is about 420-450 degrees C

 

[roscoFJ73]

Compression is still good, all cylinders were around 320-330 psi.

I have been told 1-400 is a good ratio for the oil - apparently the 2 stroke burns hotter than diesel which helps give a cleaner and more stable combustion - more efficient use of fuel = more power right?

?

Do you really believe 1 drop of 2 stroke in a cup of diesel(1:400) is going to make a difference?
You would get more from a diesel additive with cetane in it,but I still doubt you would notice it.

I think the best you can hope for power wise,is a new pump and rebuilt injectors.

 

[Gary Vansleve]

What can I do for for the cooling system? I hav replaced the radiator and the viscous clutch fan is still very firm.

Given what you have described it is a process of elimination. Namely fan belt loose;leakages; thermostat;water pump;radiator cap; possible injection timing;obstuction in the water passages of the motor and last but not least cracked cylinder head .

Have fun being Sherlock Holmes.

 

[roscoFJ73]

What makes you think its overheating? I wouldnt trust the factory gauge. I sometimes wonder if some of the owners here with heating problems actually have a temperature reading problem.
Im guesing this is a landcruiser of some sort

 

[tim753]

The 2H HJ75 are notorious for running hot. Back when I ran a turbo 2H I had the fan filled with oil so that it was constantly on. I also spaced the bonnet at the hinges so that air could flow out from the engine bay and had custom water jackets machined in the head. The solution in the end was a 12HT

 

[Redd]

take out the thermostat and install an additional 16 inch pusher fan, in front of the rad, connected to a switch. theres high powered electric fans out there nowadays, this thing draws 59 amps

SPAL USA

3430 cfm... prob you could get one in a wreckers and flip the blade so it pushes instead of pulls.

 

[Gun Runner 5]

The 2H HJ75 are notorious for running hot. Back when I ran a turbo 2H I had the fan filled with oil so that it was constantly on. I also spaced the bonnet at the hinges so that air could flow out from the engine bay and had custom water jackets machined in the head. The solution in the end was a 12HT

"The 2H HJ75 is notorious for running hot" .... Is this the case when it is mated to a turbo? I have never had "overheating" issues with my normally aspirated 2H.

 

[tim753]

Yeah with a turbo, but I remember reading somewhere the 2H 75 had problems removing hot air from the engine bay, so much so the battery would let go, hence toyota incorporated the battery vent in the front quarter towards the end of the 80s, then with the 1HZ they didn't have the heat issues and therefore no battery vent.

 

[roscoFJ73]

Yeah with a turbo, but I remember reading somewhere the 2H 75 had problems removing hot air from the engine bay, so much so the battery would let go, hence toyota incorporated the battery vent in the front quarter towards the end of the 80s, then with the 1HZ they didn't have the heat issues and therefore no battery vent.

Yes but engine bay heat and engine heat,although related,are 2 slightly different things.
You need to know the coolant temp as its coming out of the engine to know if its overheating or not.

As to the differences in engine bay heat,I think the HZJ75 radiator fan turns the opposite way to the HJ75(or was it the FJ75?)
The exhaust manifold on a HJ75 is also on the same side as the battery which is probably what causes the heat build up on the LH side and kills the battery.

 

[Gun Runner 5]

Yes but engine bay heat and engine heat,although related,are 2 slightly different things.
You need to know the coolant temp as its coming out of the engine to know if its overheating or not.

As to the differences in engine bay heat,I think the HZJ75 radiator fan turns the opposite way to the HJ75(or was it the FJ75?)
The exhaust manifold on a HJ75 is also on the same side as the battery which is probably what causes the heat build up on the LH side and kills the battery.

" I think the HZJ75 radiator fan turns the opposite way to the HJ75 ( or was it
the FJ75?)" .......Mate if you have time to figure that out you really need to find a hobby.

 

[roscoFJ73]

" I think the HZJ75 radiator fan turns the opposite way to the HJ75 ( or was it
the FJ75?)" .......Mate if you have time to figure that out you really need to find a hobby.

It was one of those things you learn by accident. When I was doing the 1HZ conversion to my FJ73 I had a look at various used fans I had laying around or could have had for nothing and noticed some had the blades angled the opposite way to others and some had small ridges on them (I havent fully fathomed them yet,turbulence suppressor)?.
As it turned I got a brand new 1HZ fan for $40.
Another VERY interesting thing was,although the fans are all the same diameter,none of the,3B,2H,3F or 1HZ fans sit in the same place behind the radiator and all need their own radiator shrouds,facinating

Hey,but Landcruisers,my Triumph RocketIII and my 2 yamahas are my hobbies

The landcruiser is the bread and butter hobby,the Triumph is the super high tech love affair that gobbles polish and cleaning rags and $700 in tyres every 15k and the 2 yammies are there when the other 2 have their maintenance up to scratch.
The XT250 Yam need headstock bearings today if I have time in preparation for a riding camping weekend held every 2 years.It will ride there on the back of the 75 series

 

[Brizcruza]

Also - I am not sure when the last time the valve clearances were adjusted.

What are the figures for valve clearances? Can I do this at home with my old man - he is a qualified mechanic and helps me work on my truck as it is. Or is it a specialist job?


"Re: 88 HJ75 questions- oil cooler, fuel economy, cooling & f"

Your engine should have an oil cooler inside the RHS of the block and is under the aluminium cover plate.. It is an oil to water heat exchanger.
If it needs extra cooling the radiator may be blocked and it is common the fins on the internal cooler may be blocked and not letting enough water through/around the cooler to get the heat from the oil.
This is essential if you want to keep cooled oil into the turbo. The extra one will also help.


Radiator is not blocked, have recently put a new one it as well as new thermostat.

-Possible replacement cost and supplier of a new internal heat exchanger?
-aftermarket external water pump to assist internal?
-external oil pump to maintain oil pressure?

 

[Gary Vansleve]

Valve clearance (Hot)
Intake 0.20 mm
Exhaust 0.36 mm
A home jobbie. Jack rear of truck up throw her in 5th and rotate rear tyre to turn crank. Due to tired engine be aware of possible wear issues on valve stem contact surfaces to the rockers. (misleading clearances)

 

[Brizcruza]

Any specific tools that I need?
What distance would you estimate I add to keep tolerances within check?

 

[clownman57]

The fuel pump on the 2h is lubricated with engine oil, making 2 stroke oil redundant.