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496 sea water pump question!

Old 11-09-2008, 09:46 AM
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Default 496 sea water pump question!

Can someone tell me if the bearing shaft assembly on the 496sea water pump should have a inward/outward movement at all? I have mine reassembled and there seems to be approx 1/16-1/8" of movement in and out. Never checked the old one before dissasembly..
Rear oil seal, tolerance ring and retainer/seal are new along with the housings!
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Old 11-09-2008, 01:38 PM
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That is how mine failed. I think mine got up to 1/2" axial play. I don't there is much when meeting spec I would say 1/8" is on the high side. Mine was so much the serp belt would slip off.
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Old 11-10-2008, 09:13 AM
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Thanks twanger, I've looked to see if there are any tolerance specs out there somewhere but no luck so far.
May live with it and see what happens.
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Old 11-10-2008, 05:13 PM
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I dont recall any movement in and out on a sea pump, just the power steering pump.
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Old 11-10-2008, 05:20 PM
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Do you have the brass pump? There should be no end play in it at all.
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Old 11-10-2008, 07:12 PM
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Yea the wonderful high tech Merc brass pump for the 496HO.
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Old 11-11-2008, 10:08 AM
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There should not be an 1/8" end play in a fully assembled pump. If you have that much play, take the pump off and check internally, somethings not quite right.
Best Regards,
Ray @ raylar
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Old 11-13-2008, 10:16 AM
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Raylar-what is the answer to this? Is there an upgrade to this pump? I have a single engine boat and carry a pump ready to slap in when something goes wrong.
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Old 11-15-2008, 06:08 PM
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The end play in this pump could actually a combination of the bearing and shaft fitment as well as some from the wear on the impellor to the back plate of the pump impellor housing. If you have a bearing going out that is creating a fore aft excess play you've got to take the pump apart and check the bearing and shaft. If the impellor is worn into the back plate with deep grooving then a machine shop can mill the back plate flat again and you can install a new impellor. You can also check with the guys at R&R performance in Lake Havasu Arizona as they make a new impellor and stainless endplate replacement kit for this pump that can save most of the worn pumps. Its cheaper than buying a new pump and a bit more durable!
Good Luck.
Best Regards,
Ray @ Raylar
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Old 11-20-2008, 05:30 PM
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I "upgraded" my 496 water pump with the R&R kit a couple of years ago due to deep grooves in the brass and their stainless end plates are holding up really well.
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