258k and 365k engine tear downs

[cjmoon]

I parted out 2 100’s 98 and 99. No one wanted the engines so I’ll be pulling them apart for fun and looking for wear.

what specifically do you think would be the high wear places to look at?

Starting with the 258k one since it was in the shop.

pulled one head off cams looked good. Only minor cylinder wall markings with lots of cross hatching still. This rig had lots of maintenance history, But was wrecked. Hard enough to break pullings and fan hub shaft on the front of the motor.

I’ll be pulling the pan off next, to get a look at the bearing condition. Maybe pull the oil pump assembly off for a closer look.

 

[MJK]

I'd be curious to know valve clearances. Those cams and buckets still look mint.

Paging @mitchclem

 

[cjmoon]

I'd be curious to know valve clearances. Those cams and buckets still look mint.

Paging @mitchclem

I would agree wiped one down, mirror finish. I’m into more Cummins diesels than others with solid flat taper lifters. These look like new. Aren’t these hydraulic? No adjust needed?

 

[mitchclem]

I'd be curious to know valve clearances. Those cams and buckets still look mint.

Paging @mitchclem

I'd love to get my hands on that passenger side intake cam!

 

[MJK]

I would agree wiped one down, mirror finish. I’m into more Cummins diesels than others with solid flat taper lifters. These look like new. Aren’t these hydraulic? No adjust needed?

I could be wrong, but I thought these needed bucket shims per the FSM.

 

[abuck99]

I'd be curious to know valve clearances. Those cams and buckets still look mint.

Paging @mitchclem

My first thought too, along with compression and leak down

 

[2001LC]

 

[Eicca]

The only thing that kills UZ motors is stupidity or neglect.

 

[2001LC]

I could be wrong, but I thought these needed bucket shims per the FSM.
View attachment 2448120

Buckets do have shim in underside that ride on top of valve stem. No Hydraulics. What I found interesting is no cam shafts bearings.

 

[Rolocado]

Any plans to rebuild either motor?

 

[Malleus]

I parted out 2 100’s 98 and 99. No one wanted the engines so I’ll be pulling them apart for fun and looking for wear.

what specifically do you think would be the high wear places to look at?

Starting with the 258k one since it was in the shop.

pulled one head off cams looked good. Only minor cylinder wall markings with lots of cross hatching still. This rig had lots of maintenance history, But was wrecked. Hard enough to break pullings and fan hub shaft on the front of the motor.

View attachment 2447799View attachment 2447801View attachment 2447802View attachment 2447803View attachment 2447804

I’ll be pulling the pan off next, to get a look at the bearing condition. Maybe pull the oil pump assembly off for a closer look.

Gotta love Toyota...

 

[Biga27110]

in for more pics

 

[cjmoon]

Any plans to rebuild either motor?

nope. Maybe keep one around for just in case.

 

[cjmoon]

Passenger side is just as clean. I’ll get the feeler gauges out and look at the lash numbers.

grabbed a few and mic’d them. All with in about .005” of each other not that much variation.

 

[NoTempoLimit]

I don't see any rollers, so it seems from the photos that the 2UZ is a "flat tappet" cam engine. Is there something I'm not seeing?

I learned about flat tappets when I found out about the controversy of ZDDP being removed from newer motor oils. But I thought flat tappets were something found on traditional 50's - 60's American OHV V8's.

 

[AlpineAccess]

.005 is on the 360k motor?

 

[jerryb]

1UZFE Vs. 2UZFE Bucket not flat, apparently?

 

[mpark525]

I see a lot of back and forth with these pre-VVTi 2UZs and whether they are interference or not.

Can you show us how far the valves go down into the cylinder, if at all?

 

[Biga27110]

I see a lot of back and forth with these pre-VVTi 2UZs and whether they are interference or not.

Can you show us how far the valves go down into the cylinder, if at all?

This would be a huge clarification of debate.

 

[yellowcake12]

I see a lot of back and forth with these pre-VVTi 2UZs and whether they are interference or not.

Can you show us how far the valves go down into the cylinder, if at all?

Just my experience as a car and LC noob, my 98 LC was out of time after doing some work on it and I was convinced it wasn't starting due to an electrical problem because I sparked the alternator with a wrench and caused other problems like parasitic drain.. I was convinced a sensor like the crank sensor went out. I must've cranked that engine out of time 100 times. No damage. Mechanic that diagnosed and put it back in time for me was convinced I had bent valves based on this. He was surprised as hell when it idled for an hour with no problems after he fixed the timing issue. I've driven it 1000 miles since and have no ill effects as far as I can tell. Never heard metal hitting metal while cranking out of time. Last fill up I got 16 MPG and runs as well as it ever has. . 1998 LC