chevrolet oil orifice

[Maurice Donckers]

Is there somebody who knows what size the orifice is in the T to the oil filter on a 216 engine ?
thanks

[motto]

The oil filter installation on the Chev 216s I am familiar with, (Military Senior), do not have a restrictor in the line upstream of the filter. The restriction is within the filter and in the form of the very small hole that allows oil into the centre tube for draining back to the oil pan.
The only restrictor I am aware of that takes the form of a fitting is the one in the line to the rocker gear. This is a nipple that screws into the distribution valve boss where the line connects.

David

[Maurice Donckers]

Hi David ,
there should be a restriction in the T that comes out of the block , and distributes the oil to the filter , and oil pressure gauge , I don`t have the original , and was wondering what the size would be , my 11 cab chev has no filter , so nothing to compare with.

[motto]

Maurice, is your filter a Military Senior? If so this should be stamped around the flat section of the lid.
I will look at a couple of spare engines tomorrow and see what they have installed on them, if anything.

David

[Maurice Donckers]

The filter is a military junior , like on a jeep , and is fitted in the chassis rail.

[Phil Waterman]

Hi Maurice

Knew I had one of those fittings tagged and put aside for future reference. The orifice is 1/16 of inch diameter.





Made up replacement by filling with solder and then drilling out the passages to the correct size, sorry no photo of the replacement. Needed a pipe tap to clean out the threads.

Photos show the one that came form my 1945 HUP which was pretty much original. Photos taken during overhaul a couple of years ago.

I replaced it as a matter of practice because I had one break off, another engine, on the test stand and it will empty the crankcase in a hurry. I was standing at the control panel when the fitting broke off at the block and oil started hitting the wall 5 feet away. Killed the engine quick, what a mess to clean up.

Cheers Phil

[Maurice Donckers]

Thanks Phill that is all I had to know , if it is not in , the restriction in the oil filter is too big for the low oil pressure in the 216 spashblock.

[Phil Waterman]

Hi Maurice

Will have to look for my test notes on oil pressure concerning filter. There are some service bulletins on the adding of oil filters and change from small to large which I'll look for.

Cheers Phil

[motto]

I have looked at Military Senior and Junior filter canisters and they both have 1/16" diameter holes in the centre tube that the oil must pass through to exit the filter. This would seem to make an external restrictor redundant.
These filters were designed for use in a bypass system and to my mind should not need any additional restriction particularly when used on a low pressure engine.
Looking in the MB-C2 manual the only restrictor mentioned is the one in the rocker feed line.
Of course Maurice, if your filter has a large hole where the ones I looked at have small holes then an external restrictor would be required.
?????

David