BJ and my best friend Bear (1 Viewer)

[Eurasiaoverland]

One other thing I've discovered whilst examining the parts collection is that the H55 to 3B bell housing has the tachometer sensor in it.
Whereas my 1HZ bellhousing has no mounting point for such a sensor. So will need to look at picking up the signal from elsewhere on the 1HDT.

View attachment 3973351

There seem to be lots of solutions out there. This was interesting...
Diesel tachometer adaptor from JRP

The 1HD-T will have the tachometer pickup on the injection pump, but it won't work with the original BJ73 tachometer.

 

[fullthrottle]

The 1HD-T will have the tachometer pickup on the injection pump, but it won't work with the original BJ73 tachometer.

There is probably a solution out there.
This was also interesting...

1HZ injection pump signal to BJ70 tachometer sensor

 

[fullthrottle]

For my records, been doing some measuring of old to new....

The clutch pressure plate is pretty big. I don't have really accurate measuring tools, so gave some tolerance here and there.

 

[fullthrottle]

Ok, so I've been spending what spare 'truck time' I have in staging the engine to gearbox and mounting in the engine bay.
I need to cut off the old 3B Engine brackets and weld replacements in that align with the 1HDT position.

These new engine brackets are like hens teeth. In fact you can only get one side as the other has now been discontinued. I guess that's what happen when a vehicle is pushing 40 years.

Thanks to Dave, he's found the following. Basically the engine brackets from an HZJ73.
51421-60140 5,790yen
51422-60140 Delisted

So my plan is to obtain 51421-60140, bolt it to the engine. Have the gearbox bolted to the engine. Then lower the whole lot into the engine bay, bolt the gearbox into it's mounts and then position the engine so that the one engine bracket is in the right position. That will at least give me the correct spacing and I'll just fabricate the other side.

 

[fullthrottle]

Been busy stripping the gearbox and transfer down. It seems pretty good, but I know it was whining a little in 5th. I understand that 5th in these H55F's are a bit weak anyway.
Otherwise it looks pretty good and bearings quite sound. I'll do some measurements and see if anything needs replacing.

 

[coldtaco]

Are HZ engine mounts available?

 

[fullthrottle]

Well my good man, I ended up going down the path you suggested. Mainly because I found that Repco (automotive parts store) is actually getting rid of these from stock.
At $283 NZD, they are pretty cheap now. There are two more left in the country if anyone wants a cheap HZJ input shaft.

 

[fullthrottle]

So now that I managed to get the old input shaft out, do some measuring to make sure it matches the HZJ / 1HZ one, I had another thought....

All the dimensions match apart from the 15mm journal and overall length of 260mm on the HZJ version.
So I end up 20mm shorter on the overall shaft length which is what I need to accommodate the 20mm shorter 1HZ bell housing.

Now the bearing retainer......I am thinking that I would need to shave 20mm off the end of that so it doesn't clash with the clutch plate?

 

[fullthrottle]

So now that I managed to get the old input shaft out, do some measuring to make sure it matches the HZJ / 1HZ one, I had another thought....

All the dimensions match apart from the 15mm journal and overall length of 260mm on the HZJ version.
So I end up 20mm shorter on the overall shaft length which is what I need to accommodate the 20mm shorter 1HZ bell housing.

Now the bearing retainer......I am thinking that I would need to shave 20mm off the end of that so it doesn't clash with the clutch plate?

Doing some more research and I would say that I would need to get the 1HZ bearing retainer. The sleeve that the thrust bearing rides back and forth on is quite a different length between the two, plus it almost needs to travel back closer to the main housing...