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Thread: How to Sand Blast a C20XE, LET etc Engine Block

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    Default How to Sand Blast a C20XE, LET etc Engine Block

    Hi People, had such good results doing this thought I'd better share it.


    This is a guide on how to sand blast a C20XE, LET etc engine block, without totally ****ing your internal surfaces or for that matter getting any grit etc in your oil galleries.


    Hopefully this will stop a few of those posts appearing saying 'my blocks oily/rusty/dirty and cant be bothered going at it with a wire wheel' and quite rightly so; there cunts of things to clean.


    At present I've done 3 blocks, the results speak for themselves.


    Firstly, I dipped the block in acid and gave it a good pressure wash, this just gets all the old oil and ****e out of the inside of the block; galleries etc. donít worry about the outside just now. I used cold water pressure washer but hot water would be ideal; you can buy a decent one for around £3000 J ha-ha.


    Few ways of dipping the block DIY style,
    1. Drop it in Ĺ a 45 Gallon drum of caustic soda / water, you can buy a 25kg bag of this for about £20 which is plenty. My dad uses this to strip paint of doors so not entirely sure where he gets it.
    2. Use STTís guide to removing rust using electrolysis, I think this is similar to using the caustic soda as the battery charger and so on forms caustic soda in the tank. http://www.pngclub.com/forum/showthread.php?149320-*HOW-TO*-remove-rust-by-electrolysis
    3. Have it dipped at Surface Processing Limited, very expensive; especially if you live where I do with postage on top.
    4. Lastly, I had my block dipped in acid at a workshop beside my work. I can't really give you much more info on this as he wouldnít tell me what was in the tank, probably because it's illegal, all I know is it's a methanol based acid and stinks. If any knows anything about this put a post up???

    Here's a before and after of a crank I got done.



    Once you've got the block dipped, washed and dried, the next step is to mask it off for blasting (masking tape will not do for this bit btwJ). This is the most time consuming bit of the whole job, and just so youíre aware I used the following tools / machines,

    Wood work machinery - planer, bandsaw, jigsaw, router & belt sander.
    Materials,
    Wood
    Neoprene (rubber sheeting)
    Glue
    Pipe (as washers for the head studs as I didnít have short ones)
    Jubilee clips
    Bolts & Washers
    1/2" NPT Plug for the turbo oil drain.

    Anyway I'll let the pics do the talking,

    (blocked off all oil galleries just to be on the safe side)



    The wood is oak and has been lined with the neoprene. Use hard wood as if ur blasting it with a decent compressor pine etc goes in bits.



    I made a panel for each face, pics are self explanitary.





    I've now changed this end panel so the gearbox mounting face and starter motor face gets blasted to. Pics further on show this.

















    New design so gearbox face get blasted.






    Gearbox face done to now.





















































    How the engine looks now.


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    engine looks good mate and a good guide,

    Is that turbo setup the nortech performance one?

    Joe

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    Quote Originally Posted by Plug View Post
    engine looks good mate and a good guide,

    Is that turbo setup the nortech performance one?

    Joe
    The manifold is an early nortech one and the turbo is from cs autos far as I know.

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    Just turned this article into a youtube Video for my channel of various things so far

    https://youtu.be/9ymyjk5tgB0

    Sent from my SM-G900F using Tapatalk

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