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How To Remove A Crankcase Gasket From An Aluminum Block And Crankcase Cover Without Damaging Them?


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#1 Gabriel OFFLINE  

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Posted December 22, 2015 - 02:25 PM

I'm replacing the crankcase gasket on a Briggs and Stratton engine that has an aluminum block and crankcase cover. I used a putty knife and small razor blade to remove as much of the gasket as I could, but it's hard to remove all traces of the gasket using these tools (which they can't seem to do anyway) and not damage the aluminum. Any suggestions on a better way? Thanks in advance.


Edited by Gabriel, December 22, 2015 - 02:37 PM.

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#2 Bill 76 ONLINE  

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Posted December 22, 2015 - 03:46 PM

spray on gasket remover then follow up with razor blade--makes one heck of a mess and has to be washed off also hard on your skin

maybe just dab some on with a q-tip to the trouble spots.Stay away from scotch brite disc and bristle disc that fit in die grinder they will remove metal--seen lot of parts ruined with them things. 

 

Also if anyone has a way of getting off dry silicone let me know. 


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#3 lyall ONLINE  

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Posted December 22, 2015 - 05:56 PM

I use several old wood chisels.  Having then sharp helps a lot.


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#4 chieffan OFFLINE  

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Posted December 22, 2015 - 06:20 PM

:ditto:   Make sure they are sharp and work slow and push easy so you can tell when you start get to deep.


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#5 Marty'70 ONLINE  

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Posted December 22, 2015 - 06:23 PM

Stay away from scotch brite disc and bristle disc that fit in die grinder they will remove metal--seen lot of parts ruined with them things. 


Ditto. I like a good sharp razor blade sometimes at a slight sliceing angle kinda like peeling a potatoes with a knife
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#6 pidjones OFFLINE  

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Posted December 22, 2015 - 06:43 PM

A task that I loath. I've heard that Easy Off oven cleaner works - never tried it, though. I keep a supply of new single-edge blades and use them without a holder to keep me from using too much pressure.
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#7 MiCarl ONLINE  

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Posted December 22, 2015 - 07:14 PM

I typically use a razor blade.  Find a spot that isn't stuck real tight and get the blade under.  Then move the blade through like you're slicing the gasket off.  A bit of sawing motion.  Then using the blade perpendicular to the surface to scratch off any residue (almost like you're painting with the blade).  You don't need to remove stains - if the blade doesn't grab on it it's of no concern.  Of course you need to be patient so you don't gouge the surface.

 

Doesn't always work though.  I recently had a motorcycle engine where the bond between the gasket and the block was stronger than the gasket.  It took my assistant and me both working at it for 5+ hours to get it all off.  That's a job that usually takes one person a half hour to do.  No money was made that day.


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#8 Tecumseh power ONLINE  

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Posted December 23, 2015 - 01:35 AM

I'm replacing the crankcase gasket on a Briggs and Stratton engine that has an aluminum block and crankcase cover. I used a putty knife and small razor blade to remove as much of the gasket as I could, but it's hard to remove all traces of the gasket using these tools (which they can't seem to do anyway) and not damage the aluminum. Any suggestions on a better way? Thanks in advance.

Yes I have a way, 3M makes round pads for your air die grinder . They are yellow , made of plastic and have long yellow fingers on them. They have them at walmart,there is a couple different colors. But they are made just for doing gaskets on aluminum . That is what we use at caterpillar
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#9 Alc ONLINE  

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Posted December 23, 2015 - 06:20 AM

Thanks Gary yz forgot that they even make these , for those with bad memory like me or never heard of them here's what they look like  

 

 

http://3mcollision.c...bristle-brushes


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#10 adamjd200 OFFLINE  

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Posted December 27, 2015 - 11:16 PM

spray on gasket remover then follow up with razor blade--makes one heck of a mess and has to be washed off also hard on your skin

maybe just dab some on with a q-tip to the trouble spots.Stay away from scotch brite disc and bristle disc that fit in die grinder they will remove metal--seen lot of parts ruined with them things. 

 

Also if anyone has a way of getting off dry silicone let me know. 

When I was in votech back in high school we used a type of these that was green and felt like Velcro, you would have had to put a lot of pressure on that before it would do any damage, the air was regulated around 15-20psi, this mehtod worked really good.


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#11 Jazz ONLINE  

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Posted December 29, 2015 - 09:54 PM

3M Scotch-Brite rolocs.  Using them today removing gaskets from aluminum intake manifold.


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#12 esbbent ONLINE  

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Posted December 29, 2015 - 10:34 PM

3M Scotch-Brite rolocs.  Using them today removing gaskets from aluminum intake manifold.

Ditto here, the white ones (softest) I use on aluminum. The green and yellow ones are stiffer and I use them on steel parts to remove gasket material.






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