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Hi, I was told it was low mileage and it had low oil pressure. I have had a careful look at the pump outer housing and there are absolutely no signs of leaks anywhere where the drain holes are etc. The condition of the pistons, liners and the correct piston ring gaps in bore suggest that the...

Hi Miles thank you for your continued help and support. This engine also needs new bearings, but at least it did not run for very long to damage to the crankshaft. I think with some modifications to the pump I will eventually have peace of mind and confidence with this engine. Regards, Harry.

Hi Emtee, I have had another look at the shaft. In the picture it looks rusty, but I can assure you that there is no rust at all, it is just the colour in the photo. Just in case people are missing the point here. I bouht this engine with the intention of buying a high mileage 4200 to put it...

What I meant to say is that, if they made the outer contact surface of the pump from cast iron, then the problem may not have occured.

Hi Parisian, I can only go by my 30+ years of building engines. I think they should have used a cast iron outer ring to contact the rotor tips.....

Thank you Parisian for your help/support. Like I said, I have rebuilt many engines in the past, mostly for racing for many years and I have never seen this sort of problem before. I must admit that the rotor type pumps that I have worked with have been constructed with a cast iron housing...

Hi Emtee, The outer gear shown is fused solid to the casing, that is why the shaft sheared off. It can only mean that the casting had a fault which detached itself. There are no signs of rust and the water pump seals are as new??? Harry.

Hi Parisian, I was told that this engine had 'low oil pressure' when I bought it! should have been advertised as 'no oil pressure!!! Thanks, Harry.

Hello everyone, here is a picture of it

Hi Benny and Emtee, thanks for your reply. I have rebuilt many engines in my time but I have never seen a failure like this. The surface of the casing has detached itself and siezed the rotor causing the shaft to shear off? The rest of the pump is as new??? This is the reason why I would rather...

Hello, I am new here and to Maserati!! I have owned many other great Italian cars though, mostly Alfa's and Lancia's. Does anybody have parts from a 4200 02 reg oil pump? I am rebuilding a very low mileage engine which has suffered an oil pump failure. The front pump's casing has failed...

Hello, I am new here and to Maserati!! I have owned many other great Italian cars though, mostly Alfa's and Lancia's. Does anybody have parts from a 4200 02 reg oil pump? I am rebuilding a very low mileage engine which has suffered an oil pump failure. The front pump's casing has failed...