Crankshaft problem (1 Viewer)

[PostmanNB]

I bought a 91 Toyota Land Cruiser LJ78 and had it for around a month when the engine developed problems with the connecting rods and crank shaft. When they took the bottom out they found filings in the oil pan and when they checked the connecting rods one of the bearings had vapourized and there was scoring on the connecting rod and crankcase.

I looked at the cost of the parts and labour to fix the 2L TE engine, I determined that it would be cheaper just to replace the engine. I ordered a 2L TE from JDM Engine Depot and was told that it was a good engine only to find that this engine had the same problem as the other one.

What would be the cause of this problem?

 

[Radd Cruisers]

The only cause of a spun rod bearing is a lack of lubrication, which leaves metal contacting metal.

A break down in lubrication (oil film) can be caused by:

- revving too much at start up before oil pressure has built up.

- coolant or other contaminants in the oil.

- interference of the piston with something in the head, causing bearing contact with the crankshaft - fluids in the combustion chamber, broken glow plugs stems [Delicas do this], improper head gasket fitment allowing the piston to strike the head, piston/valve strikes (broken timing belt, skipped timing belt).

- overheating and over-revving.

- oil clearances not measured properly during engine build.

There is certainly a disproportionate number of JDMs with this problem, so I think that sitting for long time has a lot to do with this problem.

~John

 

[roscoFJ73]

Some drivers have very little patience with 4 cyl diesels and drive them too hard .

My 73 series engine,gearbox and diffs were all worn out prematurely at about 250000klms.
I put it down to the previous owner not doing the oil changes.
The engine oil had just been changed when I bought it,but the transmission and diffs looked like they had gone 2-3 times the normal service intervals

 

[Alex470]

Tacoma Transplant?

Has anyone swapped Tacoma drivetrains to replace these Prado diesels? Here in Atlantic Canada, Toyota's buy-back program on rusty-framed Tacomas had filled the back lot at the Toyota dealer where I work. The salvage dealer hauling them away told me he had little demand for the drivetrains due to the large numbers salvaged. I would think they could make a very economical swap.