1HZ engine quetion

[roxxx]

are the bottom end prone to failures ? I was reading the outback service packages and they mention doing bearings on this motor. so is it a **** shoot ? should I expect to have to do it ?
one of the trucks i am considering is a
1990 Toyota Land Cruiser LX HZJ73 it is a high miler to i am amusing it has this motor



thank you

 

[ForealBoreal]

no they are not prone to failures. this is mainly the early 1hd-ts.
if you plan on turboing it i would do them just for the hell of it.
its an easy job to do.

1hz is a good engine.

 

[roscoFJ73]

I had mine done at 200000klms and they were like new. Its only when you up the HP that they can become problematic

 

[crushers]

if you are doing a turbo then you have the pan off so might as well do the BEB at the same time. getting the pan off is the worst part of the process
but
no, i have not heard or seen any issues with the HZ or PZ engines ...

 

[Radd Cruisers]

I run a turbo 1HZ and I had the pan off and I own a shop and I have stacks of ACLs on the shelf - I did not do my BEBs.

The main issue with the earlier 1HDTs has to do with harmonics that causes oil cavitation in the bearings themselves. There were changes to the combustion chamber design in the later 1HDTs that reduced the problem, and I have not heard it being a problem with the 1HDFT.

I have not experienced or heard or problems with the 1HZ, as the indirect injection engine design does not produce the same harmonics as the 1HDT.

~John

 

[Ron R]

I would not worry about the bearings if you can be shure the rig was well maintained.
So if you own it from new or almost new and maintained it well....don't worry.
Having said that.....
If you buy a used rig with a substantional amount of kms (miles) it might be worth the effort and the money involved to inspect them.
I know of a member of our Landcruiser club who bought a cruiser that showed 280.000 kms on the odo.
Looked like a resonably well maintained rig.
When he asked around about getting the bearings inspected, he was told that there was no need to do so.
However....he got them inspected and guess what...
The bearings were not falling apart but certainly not looking good and replaced. The crankshaft was fine.
You can see pictures of them here.
So I would recommend that, if you don't know about the history of the engine, and you're in doubt, get them inspected. The amount of money involved in a inspection (and eventually get them replaced) is far less than the money involved in an engine rebuild (if possible at all)

 

[123456]

The 1hz bottom end is very strong .