1HDT bearings

dont buy genuine bearings, clevite or such aftermarket ones are just fine, put em in and forget.

I have heard of bearings failing even after having been replaced on the Yahoo 80sCool site so for peace of mind I would be changing them at every 100K period.
For the cost involved versus a potential engine rebuild it's cheap insurance I would say.
Regards Andrew.

From my experience it was the post update model in 1992, September, 1HDT engines that had the problems. The ones after this are OK.
Toyota had two suppliers of their big end bearings. One set were OK the other had delamination problems. The only drama is that Toyota didn't record which bearings went into what engine so replaced them as they showed prblems.
120scruiser

My friend has a 91 hdt and when he bought it, he had the bearings done under warrenty recall...(it hadnt been taken in) they were pitted bad. After another 100k kms he did them again, and the acl bearings came out bad again, so in went another set. His oil pressure is 60 cold, 35 hot and 15 idle. 35 is not enough for such a big motor running up to a theoretical 4100 rpm. The 1hz for example, on thesame oil, runs 90 cold 60 hot.
Now my friends cruiser may have oval rods, i was told by the owner of the shop they do that...and no matter how many bearings are replaced, they will all come out thesame.
For $500 each 5 years, id do the bearings to be sure....if the last ones come out lovely, id consider not doing them again. The other thing to mention is the owners manual stipulates Japanese CD grade oil....this is not thesame as SAE CD....the Jap cd grade has high calcium content. Castrol CXJ is one that is Jap CD. I run it in mine, and i would recommend you do too. High calcium in oil helps bearings....ive also been told that the hdt in the Japanese domestic market had no such big end failures...
Andrew