I have a 90s Rover 4.0 in my MGB, and oil is pooling up on the top of the engine (below the air intake). I've...never seen this before! It pools up after every drive.

Where could this be coming from? The valve covers are seeping a bit, but they're dry where the oil would be dripping down onto the engine from...There are some fluid stains on the carburetor, but I dunno why oil would be in there to begin with...

There is a lot dripping near where the oil filter is, but I think I just have several leaks (and I'm trying to tackle them from top to bottom to some degree)!

You going to show us pics of the rest of the motor?

Cheers

Pressure from the crankcase is a possibility, which should vent via breather unless the vent is blocked.

Where might I find/identify said breather or vent?

Is there a good manual on this motor? The best I have has been cobbled together from Defender 90 docs...

Going to be a compromise of manuals at best.
Your manifold & carb are not standard use on Range Rovers.
Some pics from further back might give an idea of what is common.

Tremelune said:

Where might I find/identify said breather or vent?

Is there a good manual on this motor? The best I have has been cobbled together from Defender 90 docs...

Click to expand...

Ok, usually from the top of one of the rocker covers, the opposite cover to the oil filler is a good start.
Also a faulty gasket is a cause for leaking oil, loose bolt (incorrect torque) sometimes.

Breather is a fair shout. Have you tried doing a vacuum test? This might help confirm if there are any inlet manifold leaks. The tin gaskets are notorious for leaks; usually coolant from the ends but if there is a bit of a blow elsewhere, vac test might be helpful but as to where you can attach a vacuum gauge I'm not sure as you have a different carb/manifold setup.

Sometimes it isn't always obvious where a leak may be coming from. Have you considered popping the inlet manifold off? An easy enough job that may well shed light on it. The other thing is, are you sure it is a possible oil leak up there? There really isn't much where oil could come from around the inlet manifold. Rocker covers and the inlet manifold itself are the prime areas.

Oil dripping off the filter - I'd check the filter is actually screwed on tight enough, then check oil pressure switch and, if you have one fitted, the seal around the remote oil filter housing, then check hose unions. A careful inspection of the timing case might be good as well and while you're at it, check the base of the distributor. The sump can be troublesome, mine has always leaked; gasket, or RTV makes no difference but as the saying goes, if there's no oil under it, then there's no oil in it!

HTH