Build OL'BETSY ZX: 1991 HZJ77

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Realized why the stripes weren't having an effect... Needed them under the hood.
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There. Should be oozing horsepower now.

Pulled dash apart. Sanded any solder blobs I could see on the board, and tightened all nuts and screws. Pretty sure it will have no effect on my fuel/temp. So I added felt to the rub areas to reduce noise. Now I feel like I made progress.

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Some new bits arrived so it's time to get busy again. I started by replacing the filter/dryer for the AC system. Now I'm ready once again to have the system charged and hopefully call it good for a long time... The dryer I ordered first was slightly different and so I went with a universal (but made for toyota application) off Amazon and it fit the bill.
PXL_20230601_183753884.webp


Then it was time to replace the fan clutch. I rushed a bit and in the mist (yes I'm purposely misspelling the word "mist" in this case, and you'll see why in a moment) of pulling hoses one of my radiator hoses came untucked where I had bent it back and sprayed coolant all over me, the engine bay and the backyard. Oh joy.

Ultimately, I managed to remove the fan along with the shroud without touching anything else. Then it was a simple matter of unbolting the actual fan from the old fan clutch and attaching it to the new fan clutch. In this case I used an oem AISIN part.

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After I bolted everything in place again and started up the rig, I was a little shocked with how much air was moving at idle. Maybe I am just more aware, ie: placebo effect, but it seems like the new fan clutch should do a much better job of cooling the truck climbing hills. Even sitting on the bench there was a lot more resistance when trying to turn it by hand then the old one, which looked to be factory original? But who knows for sure...
 
I've also been working on another project. I've been wanting to have real water temp info for a long time, to work in tandem with my egt gauge. Finally have gotten going on this...

The center binnacle from the parts truck was dead, except the altimeter. But I always pictured using the rest of the space... Here is a start.

Really careful hole saw usage....
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And here it is mocked in place. Yes there's a second hole. No I'm not ready for that one yet. Yes you've likely figured out what it is for. No I haven't drilled a port in my sump. Yet.
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Definite inspiration right there dude.

Where'd you plumb your water temp? My investigations revealed that I don't have the sensor in the water neck, but rather the one in the head, behind and above the oil filter. I've ordered a new sensor since the old one looks like it's starting to delaminate, but perhaps I'm better off running the new gauge off that hole?
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My guage is capillary so I don't have to muck with 12v to 24v, only to swap the light bulb.
 
JDM Journeys said:
No I haven't drilled a port in my sump. Yet.
Click to expand...

I'm assuming you're referring to adding a turbocharger oil dump. If so, don't drill into the sump. Stab it. It works fantastic if you do it correctly.

forum.ih8mud.com

Guide: 1HZ - GTurbo + PDI intercooler + 3" exhaust

Documentation on adding a bit more power to my 1992 HZJ77. This entire turbo install is based on multiple guides across the internet, namely the Safari guide, which is absolutely fantastic) ' Safari Diesel Intercooled Turbocharger System for the Toyota Land Cruiser 1HZ diesel engine -...
forum.ih8mud.com forum.ih8mud.com
 
JDM Journeys said:
Some new bits arrived so it's time to get busy again. I started by replacing the filter/dryer for the AC system. Now I'm ready once again to have the system charged and hopefully call it good for a long time... The dryer I ordered first was slightly different and so I went with a universal (but made for toyota application) off Amazon and it fit the bill.
View attachment 3338098

Then it was time to replace the fan clutch. I rushed a bit and in the mist (yes I'm purposely misspelling the word "mist" in this case, and you'll see why in a moment) of pulling hoses one of my radiator hoses came untucked where I had bent it back and sprayed coolant all over me, the engine bay and the backyard. Oh joy.

Ultimately, I managed to remove the fan along with the shroud without touching anything else. Then it was a simple matter of unbolting the actual fan from the old fan clutch and attaching it to the new fan clutch. In this case I used an oem AISIN part.

View attachment 3338103

View attachment 3338104

After I bolted everything in place again and started up the rig, I was a little shocked with how much air was moving at idle. Maybe I am just more aware, ie: placebo effect, but it seems like the new fan clutch should do a much better job of cooling the truck climbing hills. Even sitting on the bench there was a lot more resistance when trying to turn it by hand then the old one, which looked to be factory original? But who knows for sure...
Click to expand...
Believe there is some difference between the green/blue/orange hubs as well. Maybe cold vs warm weather markets?
 
A/C is recharged again. This time is the charm. Was a nice warm 24c day today, but so it blew so cold on the way home that I had to turn it down. I resisted for a while because it was SO cold LOL...

In terms of my new temperature gauge sender, it seems to have put my gauge's nominal scale in a different place. Before, the gauge would almost never move above a quarter, until I started climbing large Hills and then it would creep up to 2/3. Now the resting place seems to be around a third and slowly creeping to around a half on a hill.

I still don't trust the gauge, and am installing my water temp gauge in the dash as soon as the rest of the parts come. But it does seem to be possibly more accurate than it was prior to the sender change?
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Pic was on a decent hill this morning. Bear in mind that I live at 1100m.
 
JDM Journeys said:
A/C is recharged again. This time is the charm. Was a nice warm 24c day today, but so it blew so cold on the way home that I had to turn it down. I resisted for a while because it was SO cold LOL...

In terms of my new temperature gauge sender, it seems to have put my gauge's nominal scale in a different place. Before, the gauge would almost never move above a quarter, until I started climbing large Hills and then it would creep up to 2/3. Now the resting place seems to be around a third and slowly creeping to around a half on a hill.

I still don't trust the gauge, and am installing my water temp gauge in the dash as soon as the rest of the parts come. But it does seem to be possibly more accurate than it was prior to the sender change?View attachment 3342622

Pic was on a decent hill this morning. Bear in mind that I live at 1100m.
Click to expand...

Do you have a feel for how much if not all of the temp observations are post turbo install and whether or not the turbo has an appreciable impact on temps/cooling capacity?

I look back on a TDI I had and that thing ran so cool that I could leave the radiator cap off and it wouldnt get hot even without pressurized system
 
I was noticing the same temp fluctuations you are with my 1HZ and stock radiator, tried many of things you did. Finally got a 79 series radiator that solved that issue. Also recommend the redarc gauges, tried a few others, redarc has been the most accurate and reliable. I tapped mine into the thermostat neck. I believe there are versions that come with temp boss included.
 
Loober said:
I was noticing the same temp fluctuations you are with my 1HZ and stock radiator, tried many of things you did. Finally got a 79 series radiator that solved that issue. Also recommend the redarc gauges, tried a few others, redarc has been the most accurate and reliable. I tapped mine into the thermostat neck. I believe there are versions that come with temp boss included.
Click to expand...
Did you replace radiator with new or used/higher capacity rad?

Just trying to understand what the delta was that solved the issue and whether a re-core of existing might suffice
 
coldtaco said:
When I installed the aux water temp gauge I was surprised at how hot the engine actually got, I think if I remember correctly just above half the aux gauge was showing in the 245F range.
Click to expand...
Yikes. But that was 12ht right? Hope I'm not there! Guess I'll see.

I am curious what effect timing and fuel has on water temp. I've been planning to back off timing slightly (had it advanced some when I was suffering cold start issues and haven't moved it back yet). But I'm hesitant because my egts are very reasonable and almost no smoke whatsoever. Which is remarkable at this altitude. But water temp does get a bit higher than I'd like... And not dependent on egt to get there first which is the way my diesels always operated previously, so I'm wondering if the timing advance is bringing up water temps?
 
jayp2 said:
Do you have a feel for how much if not all of the temp observations are post turbo install and whether or not the turbo has an appreciable impact on temps/cooling capacity?

I look back on a TDI I had and that thing ran so cool that I could leave the radiator cap off and it wouldnt get hot even without pressurized system
Click to expand...
My turbo is still on the bench, lol. So I guess that makes my egt probe PRE turbo? 🤣 I am trying to sort it out n/a before adding more variables.
 
Loober said:
I was noticing the same temp fluctuations you are with my 1HZ and stock radiator, tried many of things you did. Finally got a 79 series radiator that solved that issue. Also recommend the redarc gauges, tried a few others, redarc has been the most accurate and reliable. I tapped mine into the thermostat neck. I believe there are versions that come with temp boss included.
Click to expand...
Hmmm. I had my OEM rad recored last summer. Wasn't cheap so I was hoping I could leave it for a bit. 🤔
And of course new water pump, shroud in place, and new fan clutch.

Good to know about the gauge.
 
JDM Journeys said:
Yikes. But that was 12ht right? Hope I'm not there! Guess I'll see.

I am curious what effect timing and fuel has on water temp. I've been planning to back off timing slightly (had it advanced some when I was suffering cold start issues and haven't moved it back yet). But I'm hesitant because my egts are very reasonable and almost no smoke whatsoever. Which is remarkable at this altitude. But water temp does get a bit higher than I'd like... And not dependent on egt to get there first which is the way my diesels always operated previously, so I'm wondering if the timing advance is bringing up water temps?
Click to expand...
Hey bud,

Not sure you want to hear this, but advanced timing will actually reduce your EGT's. So we will have to keep digging to see if we can find out what is causing it. Already added a new water pump, so wondering if there are any areas that might be restricting flow? I don't think so, but did you ever have the oil cooler off of this thing? Wondering if there is some buildup of crap somewhere? Though I recall you did some pretty decent flushing/descaling there a while back. Knowing you, you will not rest until you get it all figured out and working like a fine-tuned mandolin... :cheers:
 
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