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Old 03-24-2007, 09:07 PM
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350 Ring Question

I picked up a 350 for$75 that threw off the damper and messed up the end of the crank, I pulled out the pistons and crank and planned on replacing the bearings and crank. They cylinder walls look good with only one or two berely visable marks and no ridge at all I was just going to put the pistons and rings back in it but my dad sayes once they come out it needs to be reringed if this is correct what is the correct proceedure to follow? What kind of ring gap do cast pistons need?

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Old 03-24-2007, 10:13 PM
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If the bores and rings are in good shape, their is no pressing need for replacing the rings. However, if the rings are not the later metric type, a set of stock-type moly rings will only cost 30-40 bucks. Not a bad investment at this point.

tom
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Old 03-24-2007, 10:50 PM
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To replace the rings I would need to take it to the machine shop to be honed right? I am going to check the ring gap once I find what is normal for the cast piston.
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Old 03-26-2007, 09:17 PM
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I checked the ring gap with the ring in three locations at the very top of the bore it was .023 about 2.5" down it was .025 and at the bottom of the bore it was .024 is this excessive ring gap? The piston appears to be cast I am not sure if it is a hypoeutectic sp. or regular cast. The only markings I can find are Made in Canada and a circle with a Z in it. Zollinger.. maybe I cant find the website for specs though.
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Old 03-26-2007, 09:55 PM
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The gap is wide and should be about .016 so new rings would be a good idea. The good news is taper in the bore doesn't sound very bad so the new rings will probably seal up fairly good. No realy need to hone the block other than a light scuff to deglaze the walls. Clean everything really good-honing/deglazing abrasive sticks to the cylinder walls and needs to be removed before assembly. Also clean the ring grooves on the pistons-be carefull not to scratch up the ring lands-this is a sealing surface. Bob
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Old 03-31-2007, 08:27 AM
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Thanks for the reply, I have a couple of other questions while doing this I did a light hone with the stones for the moly rings and the top ring gaps are around.015 to .017 about 3" down into the bore(is this the correct area to check?) The second ring is less, there were no instructions with the rings for ring gap and I cant seem to get on the sealed power web site for the last few days. Ive read that the second ring gap should be larger than the first (.020) is this true?
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