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Author
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Topic: Bake and blast cleaning of blocks
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Mpcoluv
Gearhead Posts: 1278
From: Charlotte NC usa
Registered: Apr 2001
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posted 01-05-2004 08:10 PM
   
I though I would share my mistakes with you guys.
If you ever have a block cleaned in the EPA friendly bake and shot blast method, beware.
The shot blasting can peen/burr the tops of the lifter bores a little and prevent the lifters from rotating as easily as they should. I believe that this was the reason I wiped the cam in my 372. I should have deburred the openings of the lifter bores if I had known this to be a problem.
Live and learn. Also the shot is very hard to completely get out of all the water passages.
My new block is being dipped in caustic instead of the bake and blast method.
Hopefully this time the motor will last.
BTW my wife think that I should leave the mustang on blocks. "Nothing breaks that way"!
:P
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Rory McNeil
Gearhead Posts: 1542
From: Surrey, B.C. Canada
Registered: Nov 2000
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posted 01-06-2004 01:31 AM
Sounds like you had your block "Wheel a Braded". I have iron heads done this way, comes out beautiful, but you gotta get out all the tiny steel balls before assembly. I have never heard of anybody cleaning a block this way however.------------------
78 Fairmont 428 4 speed 10.20@130mph
80 Fairmont 302 5 speed 12.8@105mph
85 Mustang NHRA Stocker 302 5speed. 13.04@101mph
59 Meteor (Canadian Ford) 2 dr sedan 332, auto
74 F350 ramp truck 390 4spd
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Mpcoluv
Gearhead Posts: 1278
From: Charlotte NC usa
Registered: Apr 2001
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posted 01-06-2004 07:47 AM
Teh shop I used has a oven that they bake the block in for a few hours, then they have some sort of large blasting cabinet with a rotary fixture that holds the block.
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kid vishus
Gearhead Posts: 6098
From: middle of NC
Registered: Oct 2000
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posted 01-06-2004 07:50 AM
I think I will just stick with the goold old fashioned "dip" method. That is, if I can find a shop that does it that way around here.
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Mpcoluv
Gearhead Posts: 1278
From: Charlotte NC usa
Registered: Apr 2001
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posted 01-06-2004 08:30 AM
Buck's has the caustic hot dip tank.
I asked Charlie about that yesterday.
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jhss2289
Journeyman Posts: 34
From: Pensacola, Fl. USA
Registered: Nov 2003
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posted 01-06-2004 08:59 AM
Sorry you had your proplem, also correct
about lifters not rotating and wiping cam.
My Son has a machine shop www.ninemilemachine.com
We bake, shot, then tumble.The proper way is to remove all plugs, use
engine brushes, hone lifter bores, and flush
completely. He hones and passes lifters through each hole when block is in honing machine, then flushes in aluminum safe circulating vat.. Believe Me! I know lifters do stick!
Because the shot in some cases can put a very small knurl at top & bottom where hit.
It is also a good idea to hit the edges of main saddles with a file.If you don't the slight egde will roll a small amount of material from back side of main bearings when rolled in and cause a tight spot where bearings join.Most major shops and all mass rebuilders
use thermal cleaning, no proplems with eqip,
when processed properly. At out shop we give a customer a clean finish produt ready to assemble, but it is still the builders job to
clean to His reqirements and inspect before
assemble. Hope this helps any confused members. Regards, Jessie Holmes, Pensacola,Fl.
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