Need some help with rebuilding process

Johnnyboiranger22 · Nov 25, 2018

Just pulled pistons today on the 91 ranger 2.3 and wondering what size rings do I reinstall do i measure existing rings in with millimeter gauge? My next question is How to to get the Auxiliary shaft bearings out? I tried putting a flat head but the bearings just chips away(silly me). Next is there a special solution to clean carbon off the pistons? My least and big question is how the hell I clean out the block cooling passages its is all gunked and rusted up int here wwill attach some pictures.

adsm08 · Nov 25, 2018

Here is how you do this correctly:

Take the block and head to a machine shop. Have it tanked, bored, and new aux shaft bearings installed. You will pay less for this than you will for the equipment to do it yourself, and they will tell you what size rings and pistons you will need. Then you have them install the new pistons onto the rods.

If you are interested in the process, after honing the cylinders out you would need a set of telescoping gauges, which you use to measure the inside of the cylinder, then you have to use a micrometer to measure your gauge, and compare to the stock size of the cylinder bore to determine how far over-bore it is.

There is a special tool to do the aux shaft bearings. It is expensive, but not really hard to use. I just take the block to the shop because I would have to do over 100 sets of cam bearings for the tool to pay for itself. I'm not building that many engines.

If you really want to clean those pistons up there is a special solution, pretty easily available. IIRC it is called "gasoline". Use some fresh gas and a tooth brush. But in all reality, if you are doing the rebuild correctly and having it honed you will probably end up needing new pistons. The only reason to not hone a cylinder is if it is still at stock measurements with no taper. Taper happens because on most engines the piston doesn't sweep the full length of the cylinder, the notable exception being the early 302s, before they made the sleeve longer.

alwaysFlOoReD · Nov 25, 2018

I can't help on how to get the bearings out, I've never worked on a 2.3.

However, you should measure the bore. Measure at the top, just below where the rings land, and at the bottom of the bore. measure on the north/south and east/west axis. The last engine I worked on was a big block 460 and the max difference between measurements [taper] is 0.007. 0.004 is better if you aren't getting machine work done. I don't know max taper for the 2.3.

Best idea overall is to get a machine shop to dunk it, that will get rid of most of the gunk in the cooling passages. They can measure the bores for you too. They can also remove and install new bearings.

Edit; Adsm08 gave a more thorough response

Johnnyboiranger22 · Nov 29, 2018

Thanks guys Im sending it to a machine shop and having them hot tank and hone/bore and install new pistons and rings, I believe this engine has pressed on for piston on to the rods

Need some help with rebuilding process

Johnnyboiranger22

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