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Old 07-14-2017, 04:38 PM   #1
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Making Gaskets?

Anything magical about a store bought "paper" gasket for my Ford Lehamn SP135 raw water pump? Can these be made by little old me using a template and some auto parts store gasket material of about the same thickness which is next to nothing?
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Old 07-14-2017, 05:02 PM   #2
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I once made one for a quick fix from a brown paper bag. Worked fine.
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Old 07-14-2017, 05:27 PM   #3
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Firstbase, yes. The method I was taught was to hold the gasket material over the piece you wish to seal and use thepein end of a small ball pein hammer to tap around the edges of the object. You will not damage the edges and you will create an impression of the shape of the gasket that is exact. Kinda like brass rubbings. Then use some sharp scissors to cut it out and hopefully a punch or similar to make sharp holes where the fasteners go. Then use a sealer or no sealer as you choose.
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Old 07-14-2017, 05:52 PM   #4
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I use thick stock paper and xerox an old one, cut it out, eazy peezy.

Old time fiahing boat engineer told me to use a paper bag, rip a chunk off, place it over the whole impeller opening, place the cover on, push the bolts through and tighten it down.

The impeller will tear off the stuff thats not needed on the inside, you trim off what isnt needed on the outside. Quickest gasket ever. And I have done that several times and it works fine.
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Old 07-14-2017, 06:03 PM   #5
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One nice feature of buying ready made gaskets is that it's probably made of a very appropriate gasket material. Like what kind of "paper" are you going to use?
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Old 07-14-2017, 06:19 PM   #6
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Greetings,
Mr. NW. It's been MY experience that the type of "paper" used is in a lot of cases is, immaterial (see what I did there?). Unless the gasket is subjected to corrosive, intense pressure/vacuum or hot environments necessitating a special type of "paper" (or metal) gasket material, pretty well anything will serve quite readily providing the "paper" is of the appropriate thickness (again, ONLY important if a specific clearance is called for).

I keep 2 rolls of automotive gasket material (one thinner and one thicker-of course I can't remember the thicknesses) on board if I have to fabricate a gasket. Haven't had to yet.

As well, I keep a hand paper punch for making the bolt holes. The punch is only 1/4" or so but one can easily "nibble" an acceptable larger round hole. A little bit more controllable than scissors in some cases.



Less than $10 if I recall...
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Old 07-14-2017, 06:26 PM   #7
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Ordinary paper does the same job....I have used regular xerox paper, thick stock, thin paper bags, heavier paper bags....I would avoid paper that quickly disintegrates in water like paper towels, newspaper, tissue paper, ect....but ain old brown paper bags of reasonable thickness works great...add a little oil and be done with the impeller change.

The trick is to smear them with motor oil so they dont stick and may be a tad more water resistant.
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Old 07-14-2017, 06:33 PM   #8
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I vaguely remember seeing a spray can of gasket material a while back. Anyone use that?
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Old 07-14-2017, 06:45 PM   #9
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A set of gasket punches is cheap and makes quick work of holes. And yes, the ball peen hammer can do the job. And pencil and scissors to trace the outside if you want to be neat and clean. Made many many gaskets using the above. Keep a roll of thin gasket paper in shop for these, but like Scott said, any paper will likely do.
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Old 07-14-2017, 07:51 PM   #10
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If you are making a gasket, cut the bolt holes first as the thin margins of a cut gasket are more likely to deform or tear.
I tend to use Loctite gasket maker a lot now.
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Old 07-14-2017, 08:00 PM   #11
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About to make some gaskets for my windlass. I've had a roll of gasket paper for years, and each time, years apart, that I look for it I spend ages trying to locate it. Often a house move in between which really screws with storage and memory! Now, last time I used it was on the boat, and after 30 mins I managed to find it. But now I cant find the hole punches..... Checked at home. Searched the boat, cant find 'em but they are on there somewhere because I used them there last year.

Oh well, I'm about to go get a new set of punches for home. Then I'll store the gasket material back on the boat, knowing that if I really need a gasket I will have all I need on the boat.. somewhere. Infrequently used stuff, and maybe just too much stuff altogether is getting to me.
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Old 07-14-2017, 09:28 PM   #12
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Years ago I was taught the ball pein hammer method as Xbanks mentioned in post #3 we used to "cut" the fastener holes with the hammer too, never had a problem. Each time time you tap out a hole drop a fastener in it so the gasket won't move out of place.
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Old 07-14-2017, 10:54 PM   #13
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Best hint ever: Go to your local greasy food provider, order 2 all dress hot dogs, keep them in the paper bag for 2 days, then toss them and use the grease impregnated paper bag to make a gasket. This will make the best gasket ever, ok it will smell the fried meat a bit but you cannot have everything

L.

Warning: Just in case... what I wrote above is just totally insane so do not try it.
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Old 07-14-2017, 11:16 PM   #14
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Thanks. Just seems too easy to DIY to go spend money on them. I would imagine that the thickness is more important on a water pump in that the cover it integral to the impeller working properly. Or so I think? Too thick a gasket would leave a little space for water to get around the impeller which would in theory slow down flow? Also seems like using permatex would do the same if I put it on, let it harden up, and then tighten down. Wouldn't that hold the cover out too far? Maybe I'm over thinking the tolerences....
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Old 07-14-2017, 11:35 PM   #15
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Quote:
Originally Posted by firstbase View Post
Thanks. Just seems too easy to DIY to go spend money on them. I would imagine that the thickness is more important on a water pump in that the cover it integral to the impeller working properly. Or so I think? Too thick a gasket would leave a little space for water to get around the impeller which would in theory slow down flow? Also seems like using permatex would do the same if I put it on, let it harden up, and then tighten down. Wouldn't that hold the cover out too far? Maybe I'm over thinking the tolerences....
You're probably over thinking it. The gasket thickness is important as it sets the impeller clearance with the front cover. If it is too thick, water can go around the impeller blades and you have less flow. Too thin and you get increased wear on the impellerand inside of the cover. That said, if you go with a brown paper bag, you'll probably never notice a difference.

Try the ball peen hammer trick. It's easy.
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Old 07-14-2017, 11:37 PM   #16
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If the pump is a Jabsco, the impeller will come with a gasket.
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Old 07-15-2017, 06:00 AM   #17
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It is a Jabsco and the impeller I ordered online didn't come with a gasket. Was a little surprised at that.
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Old 07-15-2017, 07:40 AM   #18
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Rubber impeller pumps will frequently require a thick or two gaskets if asked to pump hot coolant thru an engine.

This is a common requirement when sea water cooled blocks are converted to FW cooled.
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Old 07-15-2017, 07:43 AM   #19
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Lou was on the right track. Every gasket I hammered out in the Navy was coated with grease before installing, makes a better leak proof seal and makes them less likely to have to be scraped off the flanges later on.
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Old 07-15-2017, 09:34 AM   #20
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Quote:
Originally Posted by firstbase View Post
It is a Jabsco and the impeller I ordered online didn't come with a gasket. Was a little surprised at that.
Maybe I'm wrong, but I know at least most Jabsco impellers come with gaskets. Some impellers are used in more than one pump and come with two or three different gaskets.
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