Builds 1HZ Rebuild Project (1 Viewer)

[Nostradamus]

I tried googling Omega Injection and didn't come up with anything useful. Can one of you guys provide some contact info for Brian?

Thanks,

 

[lelandEOD]

I tried googling Omega Injection and didn't come up with anything useful. Can one of you guys provide some contact info for Brian?

Thanks,

Here ya go!

 

[Nostradamus]

Also, on a side note... as you can see from the teardown photos on page 1/2, this motor was rode hard and put away wet. And, as you might imagine, the transmission was much the same. I originally thought I'd be able to swap out a couple synchro rings and call it good, but once I got it apart and took a hard look at everything, it needed a lot more love.

Honestly, I should have just bought a new H55 from Toyota but at this point I'm committed so this box will be getting new Toyota synchros on all gears, a new 3rd gear synchro hub and slider, as well as a new first, second, and third gear. I got the rebuild kit from Kurt at @cruiseroutfit and he was super helpful on the phone as we tried to nail down which kit was appropriate for my mine truck application.

Speaking of helpfulness, I should also give a shoutout to @orangefj45. Every last part of this project is really Georg's fault as he was the one who told me about the mine truck left sitting in his storage yard to begin with. I'll have to repay his kindness by having him install a set of 4:1 gears in the transfer case at some point.

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I'm digging the exhaust pipe setup you have - can you share what it is, and where you found it?

 

[Nostradamus]

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Gracias for the Omega contact info

I have a 1HZ on a stand in my garage (with parts to turbo it) - so am following this with keen interest. It looks fantastic - keep up the great work.

 

[lelandEOD]

Gracias for the Omega contact info

I have a 1HZ on a stand in my garage (with parts to turbo it) - so am following this with keen interest. It looks fantastic - keep up the great work.

Thanks. I'm pretty excited as I may be able to fire this thing up in another month or so.

I got the turbo outlet and down pipe on eBay. I wasn't able to find a 3" V-band down pipe that did not have the two bungs so I will eventually cut those off and weld 'em closed.




The last thing I need rebuilt on this engine is the CT26 turbo. Any recommendations on a good shop to send it to for rebuild?

 

[lelandEOD]

A little update as the engine and transmission comes together.

I got the air cleaner placement and power steering hose figured out:

Then the engine came back out for completion. The engine was installed prematurely for mockup purposes so I had to install the IP and get the the timing gears installed.

 

[lelandEOD]

Compared to the timing gear install process of a 3.0L Porsche 911SC, the process for setting up the 1HZ was so simple I all but had myself convinced I was doing it wrong.

Line up the gears and you are good to go!

Spin it 720° and all timing marks line up!

 

[SHREDwagon]

I wasn't able to find a 3" V-band down pipe that did not have the two bungs so I will eventually cut those off and weld 'em closed.

Best to keep one bung for AFR readings when Dyno tuning

 

[lelandEOD]

That’s a great point, thanks for the feedback. I will use the other one for a post-turbo pyro since my Dakota Digital system can read two temp inputs anyway.

Thanks and keep the feedback coming!

 

[lelandEOD]

Updating this thread with some photos:

The injectors and fuel lines are now installed. I'm hoping to have the engine back in the truck soon.

I'm also hooking up all of the HZJ75 warning lights to this dash panel.

 

[bottombracket]

Crapdang that’s clean!

 

[lelandEOD]

Reinstalled ****hopefully**** for the last time.

 

[lelandEOD]

Well, the world's weirdest looking exhaust system is in! Just waiting on one more mandrel bend to arrive before I can get the tail pipe finished off.


Lots of compromises made. I wanted a solid 3" exhaust, but also wanted to keep it inside the frame rails... and above the bottom of the frame - this was a tall order on a 40-series running a split case - and I had to make a couple compromises to the straight pipe I would otherwise have run. I used a 3" oval section just after the resonator to squeeze between the frame and transfer case. I also had to get pretty creative with the pie cutting to get the 3" pipe to curl around the frame crossmember.

This is what I came up with:

 

[lelandEOD]

The oval section and short radius bends will undoubtedly create more resistance than a straight pipe, but again, this was a game of compromises.

Either way, I learned a lot about welding stainless (this was my first attempt).

 

[lelandEOD]

I don't know if the 4x4 indicator switch wiring will survive. I'm probably going to have the pipe coated by Jet-Hot. I can also put a heat shield sleeve over the switch/wiring. But, it may still not make it. If that happens, I'll just put a ground switch somewhere else for my 4x4 indicator light.

 

[dan1554]

Have some serious downpipe envy. I might have to youtube some stainless welding skills myself, can't seem to find an inside-the-frame downpipe off the shelf.

 

[mudgudgeon]

Shame about the location of that switch!
Nice fabrication though. Looks neat.

 

[mudgudgeon]

Welds look good.
When I did a stainless exhaust one thing that took a bit to get used to is how much stainless shifts with heat when you start stitching it together

 

[roscoFJ73]

Nothing wrong withe the exhaust. This is how Toyota would have put a 1HZ in a 45.

 

[mudgudgeon]

Nothing wrong withe the exhaust. This is how Toyota would have put a 1HZ in a 45.

Except they would have used 2" pipe and still flattened it