Thread: Oil Pressure light on instrument cluster

Originally Posted by DiscoJeffster

This has been done to death. Tangs we’re to aid in human assembled engines only. A tang will not stop a bearing rotating once a bearing snags. A bearing cannot move unless it has interference as anyone who’s assembled an engine knows, the shape and tension in a bearing keeps it firmly in place. If a bearing rotates it has seized to the crank/rod and is pulled around. You need to fix the reason the bearing touched the shell, not think a tang will solve the issue. Missing tangs is not why these fail. Poor design is.

I don't believe there is one answer to the importance of tangs. There are many discos etc running the 2.7 and 3.0 engines perfectly without tangs. From what I've seen there may be a range of issues with these engines but mainly an oil supply issue. Most of the evidence suggests its the oil pump but there could be other issues going on as well. I note there have also been reports of broken conrods etc with no damage to the crank.

But back to tangs, Toyota diesels have them. The 1HZ/1HD, 1KD and 1VD engines I've stripped down all have them. So the Toyota engineers think they are a good idea even in the most modern of factories. Other engines I've worked on have them as well. These toyota engines dont have notable histories of spun bearings.

I'm not saying the Citroen engineers and the engineers there after got it wrong, just that there are different views on tangs from an engineering perspective.

Even more surprising to me in the LR Time video is that the top bearing shell is different to the bottom shell!!! They look almost identical.

I hope old mate at the engine factory was told that as well.