Oliver 1600 Piston Sleeves

I am working on an oliver 1600 and i am wondering if on the top of the liners if it is supposed to taper down as it gets closer to the cylinder?

You mean the inside dimension (bore)? If so, NO!

On the inside,yes. Just a very little bit right at the top to funnel the rings in when you install the pistons. A sharp edge would cause them to hang up and not go in.

Was that what you meant,or is there a taper for quite a distance?

not the bore its the flange where the firering and head gasket seal on top of the liner

I have never seen any that did. All I have seen were flat on top.

Ya its very weird because i believe that led to my cylinders filling up with coolant.

Is this a gas or a diesel and if a gas what is the bore size, 3-1/2 or 3-5/8?

Diesel 265 3 3/4 inch bore

Not the inside diameter of the bore, it is on the top of the flange and we noticed it when we were measuring liner protrusion. We are a school and last year we overhauled the engine and put in new parts from YT including new liners, pistons, etc... Almost immediatly following startup the cooling system built pressure and eventually we noticed some coolant was also getting into the combustion chambers. This school year we took the engine apart and we are trying to determine the problem.

All looks ok, except we noticed that the tops of the liner flanges are not flat. We were measuring liner protrusion after clamping the liner down with a hold down tool and we had about .0035" protrusion on the outermost part of the flange, but the protrusion gets progressively less as you move in towards the centermost or inner edge of the liner. Again the outermost part was between .003 and .004", the center part of the flange where the fire-ring sits is about .000", and the inner most part is recessed about .002".

I know that the innermost part doesn't matter because the gasket doesn't seal there, but I do not get why the liner flange top wouldn't be flat. It seems like this could be contributing to our problem. Thanks.

Matt

matt, you better check those sleeves real close for cracks just below the flange. if the head gasket sets on the inside edge of the flange it will tend to crack the sleeves. the head gasket needs to set on the part of the flange that sets on the block. if the head gasket has a 33/4 " hole where it sets on the sleeve it is to small. hope this helps, chuck