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Old 04-15-2009, 10:59 AM
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Question on pump rebuild?

I have older saylor -beal 703 two stage pump was going to send it out for rebuild. The rebuilder wanted like $1000 to do it. So I figured I would do it myself.I got a rebuild kit has everything nessary to do it.Just wondering has anyone done this before and any tips I should know before doing this. I have rebuild a number of engines, which are air pumps in nature.

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Old 04-15-2009, 11:21 AM
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Based on my vast experience of rebuilding one air compressor pump 20 years ago, it's easy. Just use normal good practices and mic or plastigage the journals if possible. Know the specs and make sure when you put it together the clearances and torques are within spec. Make sure you assemble it the same way it came apart.
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Old 04-15-2009, 02:45 PM
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What he said, treat it just as you would an engine and adhere to general engine type rebuilding practices but think in terms of air cooled engines. Now having said that pay particular attention to the valve assemblies as these can be real trouble spots if ignored or just given a quick "once-over" type of inspection/repair. Usually on a compressor pump a lot of emphasis will be placed on the cylinders and pistons/rings when valve leakage is apt to be a major cause of compression loss.
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Old 04-15-2009, 02:54 PM
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The one I did had reed valves in cartridges. They were carboned up, so I just used Carbon Tet on them. Can't get that anymore I suppose.
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Old 04-15-2009, 05:59 PM
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When rebuilding Air compressors. Check the bore wear. The larger piston tends to be the worst. Due to heat and contaminents that get by the filters. Make sure oversizes and/or new piston/cylinders are available. Same for the crankshaft. Some manufacturers only offer standard or .020 rods (or bearings). Check wrist pins carefully. Replace the air valve at the end of the crankshaft (the one that bleeds off air on stop) and be sure the tube is clear. Check the heads for warp and replace the reed valves if that type of head. Old reed valves have a nasty habit of cracking soon after a fresh rebuild.
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