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Old 22-06-2014, 15:19   #16
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Re: Screws Stuck in Water Pump

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+1 on ez breaks
EZ Breaks. I love it. Very appropriate.
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Old 22-06-2014, 15:20   #17
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Re: Screws Stuck in Water Pump

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I like to put in SS Allen head bolts. Easy to use when turning in the blind! And SS and bronze are very forgiving together.
Second that as well. SS very compatible with bronze and much easier to find that bronze screws.
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Old 22-06-2014, 16:04   #18
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Screws Stuck in Water Pump

Try soaking the pump in vinegar for a day or two and scrubbing with an old toothbrush. Then try to get the screw out. This worked for us or a screw with a missing head we found in a leaky generator water pump left by the previous owner. I've heard bronze screws are slotted due to their use in wooden boats..when the screw is very corroded, the slot can be grooved again to get a bite.
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Old 22-06-2014, 17:06   #19
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Re: Screws Stuck in Water Pump

Proper technique is to soak troublesome fasteners with AeroKroil; then use heat and a hand-held impact driver with the proper sized bit. Anybody can turn good machinery into a machine shop project.
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Old 22-06-2014, 17:36   #20
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I purchased a Ryobi drill and impact driver combo. came with an attachment for sockets, 2 lithium batteries and a charger for about $150. Totally worth it.
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Old 22-06-2014, 17:42   #21
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Re: Screws Stuck in Water Pump

Plus 1 for PB Blaster. AeroKroil is even better but harder to find. I would soak it for a couple of days in one of those. Heat with torch and let cool a couple of cycles. Then use a hand held impact driver like Terra Nova mentioned. ( Just one source that I found quickly. Great Neck® Impact Driver Kit (IMD5) - Screwdrivers & Nutdrivers - Ace Hardware ) Note that the flat screw driver blade with this one is hollow ground. That makes the sides of the blade parallel in the screw slot instead of wedge shaped. Do be sure to find a set of hollow ground blades so you can choose one to fit snugly in the slot. If cleaning up the slot avoid going any deeper than really required as this will weaken the head. The hand held impact driver or "hammer driver" will amaze you. I wouldn't be without one.
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Old 22-06-2014, 17:48   #22
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Re: Screws Stuck in Water Pump

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I purchased a Ryobi drill and impact driver combo...
This is a good way to destroy screw heads.
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Old 22-06-2014, 17:58   #23
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Quote:
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This is a good way to destroy screw heads.
I was pretty sure you were going to say something like that. It works fine for me
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Old 22-06-2014, 18:00   #24
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Re: Screws Stuck in Water Pump

Huge difference between the power impact driver and a "hammer driver" the hammer type does the tap in or down on the screw simultaneously with the torque. The power impact driver is more likely ruin the screw to no avail.
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Old 22-06-2014, 18:11   #25
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Huge difference in price too. Id just like to add that the Ryobi doesn't hit it hard enough 2 make the bit want to pop out of the head
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Old 22-06-2014, 18:39   #26
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Re: Screws Stuck in Water Pump

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Originally Posted by openseas View Post
.
I know that when I take off of shore, I have to do everything by myself, and I am trying to learn anything I can about my boat.
Any suggestions, or tricks to loosen the screws?
Thanks,

Andy
A water pump is a spare part. You can't run to Autozone when you are in the middle of the pacific.

If you are changing the impeller (unless it was damaged by something going in there) you should also be replacing the seals and maybe the bearings. Now all you have is a housing.

Parts generally are cheaper as an assembly than individually so stocking a whole pump is a good idea.

Removing small screws by hand with easy outs is a hit and miss proposition. A drill press is great so you drill straight. Barring that a drill guide similar to attached will help you drill the screw straight - although these particular ones are for countersinking.

You want the max drill size without damaging the hole threads so you can put the max size easy out in there. Once you damage the hole threads the game is basically over.
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Old 22-06-2014, 19:11   #27
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Re: Screws Stuck in Water Pump

thanks for all your advices.
I went to Auto Zone, found the PB Blaster, I sprayed it on the screws, and let it sit for 3 hours, then grabbed each screw with a small vise, and yes all the four screws that didn't move first, now came loose.
I am wondering if the Yanmar dealer sell the screws by themselves, and if they have them with a bolt head now instead of an actual screw. Because I don't want to try to put these screws back.
I think that when you design something, you should put in mind, to resign it in a way where if you had to retrieve it or replace it, it should be easy.
Andy
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Old 22-06-2014, 19:25   #28
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Re: Screws Stuck in Water Pump

Quote:
Originally Posted by openseas View Post
thanks for all your advices.
I went to Auto Zone, found the PB Blaster, I sprayed it on the screws, and let it sit for 3 hours, then grabbed each screw with a small vise, and yes all the four screws that didn't move first, now came loose.
I am wondering if the Yanmar dealer sell the screws by themselves, and if they have them with a bolt head now instead of an actual screw. Because I don't want to try to put these screws back.
I think that when you design something, you should put in mind, to resign it in a way where if you had to retrieve it or replace it, it should be easy.
Andy
Don't need Yanmar screws, for several reasons. First, Yanmar didn't even make the pump. It was certainly made by a pump company, probably Sherwood. Yanmar buys the pumps, puts their part number on it and doubles the price.

Second, all you really need to do is find a good grade stainless steel screw with the proper threads to fit. Does not have to come from a marine source.
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Old 22-06-2014, 19:31   #29
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Re: Screws Stuck in Water Pump

Welcome to Speedseal Safety Covers

Well worth checking out.
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Old 22-06-2014, 20:14   #30
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Openseas glad to hear you got it done. Just bring the screws into the hardware store and I'm sure you can find matching bolts. And don't forget to put anti seize or Loctite on it when assembling. Or even waterproof grease
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