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> Rebuiding Inside-out
bkrantz
post Jan 9 2023, 08:01 PM
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And I used a puller to take off the blower hub.


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bkrantz
post Jan 9 2023, 08:03 PM
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I finally drained the oil. This was the second fill after startup.


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bkrantz
post Jan 9 2023, 08:04 PM
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And with the cross bar and engine mounts, I could access the pump.


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bkrantz
post Jan 9 2023, 08:05 PM
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Pump cover off.


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bkrantz
post Jan 14 2023, 09:38 PM
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After some more investigation, as reported on my other thread about oil leaks, I can say (with embarrassment) that the oil filter was loose and probably responsible for much of the leaked oil.

One other culprit might be the pump cover. I want to make sure the mating surface is flat. So I got out my new reference flat: a piece of machined aluminum plate. I got this at one of my favorite stores, Industrial Metal Supply, in Tucson. They sell just about any type and grade of metal, including aerospace stuff. They also have a room of cut-off pieces, sold by the pound. I paid something like $30 for this machined plate. It has a few scratches, but will serve this purpose.


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bkrantz
post Jan 14 2023, 09:39 PM
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Here's the cover, cleaned up and old sealant removed. You can see some uneven scoring from the pump gear.


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bkrantz
post Jan 14 2023, 09:40 PM
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To check the cover flatness, I sprayed the mount surface with flat black.


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bkrantz
post Jan 14 2023, 09:41 PM
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800 grit paper on the aluminum.


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bkrantz
post Jan 14 2023, 09:42 PM
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Some light sanding shows that two corners are high.


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bkrantz
post Jan 14 2023, 09:43 PM
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I got out some 400 grit paper, to start making the cover flat.


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bkrantz
post Jan 14 2023, 09:44 PM
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First round of sanding, and the cover sure looks uneven, and especially high from lower left to upper right.


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bkrantz
post Jan 14 2023, 09:46 PM
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After about 30 minutes, but still not quite even. But time for dinner.


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930cabman
post Jan 15 2023, 08:19 AM
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I would bet there is a probability for leakage at the pump cover. How much out of whack would you estimate the cover was? It looks as though it is stamped steel with rolled edges.
A loose filter could also create some mess.

Thanks for the investigative work
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bkrantz
post Jan 15 2023, 08:41 PM
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QUOTE(930cabman @ Jan 15 2023, 07:19 AM) *

I would bet there is a probability for leakage at the pump cover. How much out of whack would you estimate the cover was? It looks as though it is stamped steel with rolled edges.
A loose filter could also create some mess.

Thanks for the investigative work


Yes, stamped steel with folded edge, and then machined. But certainly not flat when installed.
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bkrantz
post Jan 15 2023, 08:43 PM
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More 400 grit. Not perfect but getting tired, so good enough? (IMG:style_emoticons/default/confused24.gif)


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bkrantz
post Jan 15 2023, 08:43 PM
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Then 800 grit.


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bkrantz
post Jan 15 2023, 08:44 PM
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And 1000 grit. Shiny and ready.


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930cabman
post Jan 16 2023, 06:01 AM
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With a very thin paper gasket?
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Puebloswatcop
post Jan 16 2023, 06:30 PM
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Hoping that after all of the detective work and manual labor this is the solution......
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bkrantz
post Jan 16 2023, 08:24 PM
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QUOTE(930cabman @ Jan 16 2023, 05:01 AM) *

With a very thin paper gasket?


Good question. I would like to hear from others. I did not use a gasket originally.
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