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  1. #1
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    Default Block cleaning and Oil gallery cleaning

    Hi
    After a very very humid summer my new chevy SHP block would look at home in the desert . Surface rust .
    Very minor on part of bores only --going to be finish machined anways
    decks will be machined

    Mainly on mains caps at rear is the worst, caps can be wire wheeled
    bell housing area wire wheel on grinder
    Above cam or underside of valley

    Engine block will be hot washed after machine work

    Questions
    1/Been suggested rust convertor after wire wheel treatment . What do ya think ????
    2/Oil gallery wire brush ,any body recommend some eg Ebay or Morosso

  2. #2
    been here .......too long Smitty2's Avatar
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    .. I got an oil gallery brush set from Bursons years ago
    still have it, seems to work well

    and rust converter? hmmmm not sure on that one
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  3. #3
    Do you ever leave? paulzig's Avatar
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    Use some WD40 and wire wheel, dont use rust converter, no need...

  4. #4
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    hi
    valley underside is a little inaccessible any suggestion ?.

    Blocks around at machine shop at the moment getting the 4 corners rough bored so I can measure deck height . Machinist suggested that all prep measuring ,deburring be done first including any rust removal .Machine work then done and final hot wash ,assemble then paint .


    The wet season has been real bad ,any bare steel u touch is brown within 24 hrs . Main reason for the engine to be done is to get it oiled sealed up and painted .

    Yea Paul going low travel roller lifters [cam will be changed in future] and AFR low rise single plane. Should lift topend power lessen bottom end TQ which I have plenty of ,actually to much . With a cam change 242/248 I might get that peak at 6300 and rev to 6600.
    Changed to 3200 stall as well .
    Last edited by swampy; 25-04-2019 at 05:29 PM.

  5. #5
    Do you ever leave? paulzig's Avatar
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    Get some scotch brite pads and WD too... Once they've done all the machine work the hot wash has caustic soda in it... it'll remove most of it...

    I wouldnt worry too much..

  6. #6
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    Cummins or Fleetgard do a product called restore plus, designed for cooling systems but very good on rust and oil deposits.

    https://www.cumminsfiltration.com/em...lus%20GB_0.pdf

  7. #7
    casual poster kiwiholdenman's Avatar
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    Default

    Best thing for rusty cast iron is a molasses bath, easy to make and works amazing.
    Have saved a lot of old red heads and cams too.

  8. #8
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    hi
    Not overly happy with machinist but not another for 1500kms . I thought hot washes removes surface stuff but they are saying it does not . I suppose they don't use any chemicals in the wash WTF !!. Yup I don't have the greatest confidence . There is a new sonic cleaner being installed in another generic reco w/shop might send it there for cleaning afterwards .

    Typical unfortunately in regional areas of QLD double the price for half the service .
    Costing xtra to ship or have done in Brizzy etc and no come back if the shop f...ks it up .
    As it is I have to take some where else to get balanced --counter weights apparently are heavy on scat steel units so it might only need drilling .


    Scotch brite and crc for the sensitive areas at least and wire wheel etc for low priority areas

  9. #9
    been here .......too long Smitty2's Avatar
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    I think we know at least 2 shops in the Bris area with good reps...
    HPE and Zoks

    does that help?
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  10. #10
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    Quote Originally Posted by swampy View Post
    I thought hot washes removes surface stuff but they are saying it does not . I suppose they don't use any chemicals in the wash WTF !!. Yup I don't have the greatest confidence . There is a new sonic cleaner being installed in another generic reco w/shop might send it there for cleaning afterwards .
    If your talking surface rust then no, hot wash wont remove it completely. They should be using an alkaline base chemical with an inhibitor in the wash, that will stop rust from appearing for week's even months in the right environment.
    When the wash stops, if parts are not removed quickly enough, the steam will cause surface rust to form before the inhibitors form a protective layer.

    Ultra sonic wash can be worse for rust to occur after cleaning, usually easier to wash in a regular hot wash after an ultra sonic bath for a better result. Finding an ultrasonic bath big enough for an engine block will be your next problem because they aint cheap to buy or run.

    If your trying to get rid of surface rust, Wonderclean will also do it if you don't dilute it, otherwise restore plus is a good bet.

  11. #11
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    Hi
    HQ368

    Sonic cleaner clean better but worse for corrosion reappearing correct . ?? Will the sonic remove surface rust better than a hot wash ??

    The other workshop is going ultrasonic bath because of electricity apparently the heater is a big consumer . Weeks ago when he mentioned the pending new arrival said it cleaned well but didn't say anything about rust removal . Have to phone em up . Did say it would removed the caked on corrosion on the cylinders in my 308 block .

    Once all cleaned up it will be drowned in CRC till ready to paint

  12. #12
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    Ultrasonic wont remove rust unless you put a rust removing solution in it. Corrosion reappearing after wash depends on the chemical and how conscientious the operator is.

    Ultrasonic bath is also heated, they don't work so well cold and its important to get all the heavy debris off first otherwise your wasting your time.
    I have a little one originally designed for cleaning jewellery which is only good for doing small parts and the like up to the size of starter motors and distributors, complete waste of time with it cold.
    The Grease monkey on the other hand is killer, can hit it with a few different kinds of blasts and does a really good job on larger items but again is a waste of time cold.

    If the oil skimmer isn't working properly you end up with an oily foam on top of the bath and when the item's are removed they are pulled through all the crap again.

    The restore plus will take off the scale and rust on the cylinder walls exposed to the cooling system really well, that's what it is designed for.
    A Gerni with the detergent line into a drum of CT18 will also get the scale off the cylinder walls.

  13. #13
    been here .......too long Smitty2's Avatar
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    Quote Originally Posted by HQ 368 View Post
    .....................
    A Gerni with the detergent line into a drum of CT18 will also get the scale off the cylinder walls.
    that's a handy tip
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  14. #14
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    Hi
    Moroso engine oil gallery brushes seem better than whats available at Bunnings etc . Bunnings have small diameter but short brushes 250mm .kit is 7-11$ . Moroso have 34inch long x 1/2 inch diameter . kit is 55$.

    I always pressure clean cylinder heads when they come back from machine shop . Then blow out with compressed air . Engine blocks no different.
    [blocks cleaned at machine shop mostly] . Doing welsch plugs with an engine removed I also pressure clean the corrosion out water jackets . Huge amounts of corrosion comes out.


    Ultrasonic cleaners work at least for injectors . With an appropriate chemical after 3x variable frequency cycles injectors are clean . This balances the volume between a batch of injectors and tidys up the spray pattern .
    The assumption would be that a hot wash or ultrasonic cleaner depend heavily on chemicals for a good result.
    Last edited by swampy; 27-04-2019 at 08:51 AM.

  15. #15
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    Quote Originally Posted by swampy View Post
    The assumption would be that a hot wash or ultrasonic cleaner depend heavily on chemicals for a good result.
    Absolutely, also I find the temperature of the wash also plays a big part.
    If it's a typical hot wash the pressure and volume play a big part as well.

    Ultrasonic solutions can work very well with some machines and on other machines be next to useless.

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