I have just rebuilt my Pinto and have covered about 80 miles. All going well.

I have come to start the engine this afternoon and the seal on the oil filter blew out of the groove in the filter and dumped 3 pints of oil on the floor.

What would cause this?

I fitted a new high pressure pump when rebuilding the engine and it runs at approx 80psi when running and drops to about 50psi at tickover when hot

Oil pressure relief valve stuck !

Silly question but was the filter screwed on tight enough? I would have thought that not compressing the seal enough would allow the high oil pressure to blow it out.

john.

Ive seen this happen on Fuel Filters on a 1MVA Perkins Generator. The fuel literally sprays the whole room and was down to a faulty batch of filters.

Replace it and dismiss. If it happens again, youll know that you need to look further.

Oil presure relief valve stuck.