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Washing engine parts

Discussion in 'Modifications and Projects' at netrider.net.au started by Devery, Aug 22, 2010.

  1. I have my CZ 175 engine in pieces to rebuild it. What is the best method to clean all the parts? There are the cases and then things like gears etc. I'd like to have it spotless ready to polish the side covers and paint some other bits. For the cases, can I pay someone to do a professional wash? Is media blasting a bad idea?

    For internal parts I was thinking petrol perhaps?

  2. i wouldn't blast them, you'll just pit the case.
    i've heard of a few people using a dishwasher to clean engine parts, but make sure you send the wife away for a pamper day first (do it while she's gone) or maybe try convincing a transmission shop to throw the parts in the steam cleaner.

    perhaps everyday engine degreaser and hit it with the karcher first to get rid of the bulk of the crap before you throw them in the dishwasher though
  3. Petrol does more than good enough job. Depending on what the bits are made of you could have the cases etc that are to be polished/painted acid dipped at an engine reco place or similar.
  4. Petrol & Degreaser is fine. If you wanna be fussy given em a final wash in spirits. ( Shell sells it at your local servo ).
    Do NOT bead blast
  5. Don't use the washing powder though, you could have a reaction with the aluminum.

    Petrol or kero will do the job. (er, not in the dishwasher, obviously...)

    Media blasting such as soda blasting will work for the outside cases, but it's a very bad idea for the internals
  6. A good long soak in acetone (Bunnings sell it, or anywhere specialising in fibreglass materials) brings even the grubbiest components up like new with very little effort. Careful what you put it in though as it eats many plastics in very short order. Metal bucket or saucepan is good.

    Wear gloves and work in a well ventilated area. It is a moderately nasty carcinogen, although probably no worse than petrol.
  7. I used Kerosene on some of my car engine parts and had no problems with it. Nor did I have any problems with Petrol either. Either do the trick, however make sure you remove all the gunky stuff first.
  8. Thanks everyone. I'll let you know what I try and post some pictures.
  9. First I'm looking to clean the cases. I tried with some petrol and then some acetone, but I didn't have great quantities so I couldn't soak them. They worked okay, but a lot of the tight spaces retained the grit.

    The first picture shows the RH case alternator side (before cleaning). It's got quite a bit of crud. The second picture shows the LH case where the inside looks quite good to me but the outside needs a real good cleaning.

    I'm not sure what I'm after but I want these cases to look brand new. What sort of places would clean them for me? or should I look into buying / mixing something for it to soak in?

    Attached Files:

  10. Is this the spare engine? Let me know when assembling time comes - I need practice for my SR500 engine rebuild....
  11. I remembered watching a thread on the sr500forum.com where a gentleman was building a salt racer. His finishing is immaculate. Check out this page where some discussion on the engine finish takes place for both the saltie and another SR engine:


    I called the place where he got the engine cleaned (not the salt racer, but the picture is in that forum post) and it sounds pretty impressive. They are called HydroBlast (http://www.yellowpages.com.au/vic/sandringham/hydroblast-12307762-listing.html) They clean everything (said something about a hot bath) and blast it with a mix of water, detergent and some medium I think. The guy was really nice, he works with engines so his methods are purpose built for this sort of thing. $70 per hour, he said without seeing the engine it might be a $200 job but no way of saying. He also said if it was 10 mins work he'll charge for the 10 mins. As he works with engines he also knows what to mask off and where to blast without damaging anything.

    I don't think this little engine deserves a $200 clean, but maybe I could justify $100... Lots of time saved and the results look fantastic. Before all this I will have someone look at the parts to make sure nothing is damaged beyond repair.

    Any other companies out there that do this sort of work? Or some products (I think someone here once linked me to some wire brushes)? Solutions?
  12. Great :) Yeah its the spare.
  13. these guys advertise in Just Bikes:


  14. I've got a small soda blasting rig, you're welcome to come round & use it, but you'll need to supply your own soda & beer for me... :)

    It's a pretty simple thing, it'll take the cases back to bare metal pretty easily. Probably cost you ~$20 in bi carb soda.

    A wire brush will leave score marks on the cases which you'll need to polish out, which will be very hard to do on the cylinder fins...
  15. That would be fantastic. I'll reply to your PM.

    Thanks mate! What kind of beer?
  16. 6 coopers ale will suffice :)
  17. The insides just need to be clean when you re-assemble. I'd have thought the outsides could do with some sort of media blasting, but you'd have to protect the insides, maybe partial assembly of cases+masking???? A reputable business that does that sort of work coud presumably advise.
  18. Just take your engine cases to a decent engine reconditioners. They will hot tank them for you and will come back looking like new.
    Kero is about the least offensive for cleaning the internals.
  19. Soda blasting went really well, thanks to MV! The cases have some pretty serious grime that has really dug in deep, but I'm currently degreasing, cleaning, degreasing, cleaning... I'll do that till its ready for a bit of a polish and it should be sweet.

    Thanks again, MV.
  20. No worries, hope it turns out ok!