4MG Rebuild

I was wrong when I posted earlier that I have 3425s. I pulled the #1 nozzle this morning and I have 3423s. I was going to go get it pop tested but just decided to replace it, and with a new one - which is a 7W-7026. I looked in the intake ports and couldn't see any real difference as far as I could see. We didn't take the exhaust manifold off because it hadn't been on that long, and there were no broken studs.

Things are progressing, but the new block (which is older) is a 4MG 06862. The one with the crack is a 4MG 34713. The one that we took out of the white truck and put in the blue truck is the youngest - 4MG 479xx as I recall. There are subtle differences in some of the external parts between the one we are building and the other two. The earliest one used an o-ring fitting above the water pump connecting that housing to the head, while the other two just have a really short hose. Also, and this had us stumped for awhile, the two oil coolers, which are longer than normal because of the brakesavers, are slightly different. The oldest one has a core that can be replaced, but it doesn't appear as if the other two do, and they are about an inch longer. I'm still trying to decide which to use as one is off and the other still bolted up to the cracked block. The core tubes look really good in the one that is off, surprisingly.

Anyway, we're making progress slow but sure.

 

Harbor Freight torque wrench (poor man, but it seems to work consistently).

 

At least the readings feel consistent between bolts. I hope we are within the allowable tolerance.

 

Well, had to go to LA last weekend for a memorial service and then caught the crud worse than I can remember. Took a week to get over the fever. Anyway, were back at it today.
Swapped retarders from one to another:



For those that have endured the whole story, this all started because of a crack in the block. I have been hoping that the cause of the crack would show itself. It may not have shown itself for sure, but these two bolts were loose and backed out of their holes somewhat.

The smaller is a 3/8 ths bolt and is in line with the oil gallery where the crack is. This engine was put together at the Cat shop. I can't say that these loose bolts had anything to do with the crack, but they sure are in an interesting place adjacent to the crack.

 

If a fella is going to have to go to Orange County for a weekend, it could be a lot worse. Here is the house we rented for the family - 7 adults and 4 grandchildren.



It was pretty cool to be able to walk out and pick a fresh orange, lime, or lemon of the trees in the yard. I had one of the best Gin & Tonics I have ever had with fresh lime! And I'm not much of a gin drinker.

 

Got the oil cooler hung on the block, adjusted the valves, and did some more painting.

 

Ok, we have hung the fuel injectin pump and thanks to a refresher course by @wore out have it timed, installed all the brakesaver plumbing, the compressor, and power steering pump. We missed installing a small plug in the block behind the air compressor but managed to get it in without removing the compressor. We have it back in the truck frame and hung the clutch. Now for the daunting task of installing everything on the new frame and swapping the cab - oh boy!