Re: Dave's 2279 restoration

Posted by gone1951 On 2008/9/16 13:23:32
Quote:
I have changed the cam bearings and de-glazed the cylinders. there approximately .001 taper. I will reuse the old pistons and rings.



Dave I think most mechanics will agree that it is not a good idea to try and reuse old rings. The cylinder taper is good and should only require a hone job. As for the rings, unless you are able ( and you are not) to replace the rings in the same cylinder in exactly the same orientation they will not re seat. Rings ,when new, are not square and flat to the cylinder wall. The rings are cut so the top edge of the ring contacts the cylinder but the bottom does not. Kind of like a sharp knife edge. As the engine brake in for for first 500 or so miles the rings and cylinder wear together and form a tight seal. The old rings are already worn square on the outer edge and will not re seal again. You will probably end up with much smoke forever out the tail pipe.

Rod and main bearings with the clearance you noted in my opinion can be reused. Inspect the crank for scoring. It is very important that if you reuse old bearings that you be very careful not to mix them up from one through to the next. You should not use, for instance the bearings from #1 cylinder in the rod from say #3 cylinder on say #5 journal. Again all these things are worn differently and may not last as long if mixed up. Replacing bearings after one has failed and wrecked the crank is a huge job as you already know. If they are already mixed up my opinion is through them away and replace them with new.

I have never reused the old bearings or the old rings no matter how good they look or mike out.

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