b2200 smoking update!

93 b2200 showing even compression across the board 170 psi in all cylinders. t has had a new head gasket and valve seats. didn't smoke blue smoke before the head gasket. could it be hairline cracks in the head that i didn't see? it smokes when you give it throttle blue smoke a good bit and it also seems to be running rich. the guy i bought it from said it didn't overheat bad only got up to 3/4 on the temp gauge. expanded oil rings? torn valve seats or what?

My '88 B2200 had 165 psi all around, and still smoked. I got new pistons, rings, rod bearings, and had the cylinder head redone, now no smoke, 3.25 years ago, 21K on the rebuild. Rebuild thread below in my signature line.

Thanks for the info man are you able to drop the Pistons out without removing the crank on these mazdas? And are the Pistons presded fit or held in with wrist pins ?

Pistons come out the top of the motor, crank can stay installed. Head has to come off. Wrist pins are pressed in.

You didn't fall to mention that you put new rings in to?

If not.......
So, do all the steps to pull the head back off, drop the oil pan. Remove one rod cap. knock that piston out (can use a cut piece of broom handle, tapped with a ball peen no metal touch metal, it causes burs, nicks in the surface). Pay attention to which side of the rod cap was on the driver's side of the truck. Same with the rod (remember?, which side), slide them back together, put the nuts on hand tight. Use a stamp (numbered) or for lack of stamps, use a center punch or like object to lightly make a number of punch marks appropriate for that cylinder number on the crankshaft, (1 and 1, 2 and 2, 3 and 3, etc.) on both the rod cap and beside that on the rod itself. Remove next rod, knock the piston out, yada, yada, yada.

Check or have a mechanic look at the timing pulley on the head. Is there wear to warrant a new timing chain, while you are there at it?

Be careful of nicking any machined mating surfaces. Will need new set of rod bearings and rings (clean or have the ring grooves cleaned thoroughly). Measure thickness of the bearing with a ball end micrometer (or over a ball bearing with calipers or mic, subtract ball bearing thickness) to determine if crank has been turned before (a thicker than stock thickness has been turned).