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Olympia Express Cremina 67 Rebuild

So I have a new toy on the bench  :coffee2:

I didn't need another machine and I blame (read: "thank") all of you guys with your "lever" talk and rebuild project threads. For a 38 year old machine this is in absolutely fantastic condition, a few chips in the paint on the outer cover, some very hard gaskets and seals and a very small amount of scale sums up the worst of it (so far). The Group to boiler gasket was replaced in 2007 and possibly a few other bits but that remains unknown.

The lever action is smooth but there is a tiny bit of friction about mid way suggesting a bit of scale in the piston cylinder. The wiring is like new and the boiler has already had the asbestos coating removed.

So here is the first post in what will be a first for me - a rebuild thread. I have ordered a complete rebuild kit from OE so I will be dismantling and rebuilding the whole machine over the coming weeks. While I am at it I will be swapping the steam wand to that of a 2002 model, giving it a paint job to match my matt black Super Jolly and a thorough clean in all other areas.

Pics to come...
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Comments

  • Tell me more about the anti vac and temp management
  • Oh and here's the first of many pics that will make this thread
  • Just finished dismantling the Cremina and am happy to report that I didn't break anything LOL... The frame is in great nic but will get a lick of paint to match the outer cover, matt black.I couldn't spot any rust so I will give it a light sand and then the new top coat. th_frame.png The boiler looked okay but is really needing a thorough descale, I have it soaking in citric and will give it a good scrub in and out. The base plate and element will need some work too. The original gasket and hex-bolts were still in tact so looks like this is the first time its been pulled apart in all it's life. Need some new bolts as these are quite rusted and  are few are missing some thread. th_boiler_and_element.png th_IMG_0218-1.jpg th_element.png th_boiler_nuts.png Here is the base plate. The brownie "stuff" around the terminals is flaking off. Can anyone tell me what it is and where I might buy some? Can I get it at Jay-Car or similar? th_base_plate.png
  • Thanks AM, so would this be better suited: http://www.orphanespresso.com/Heating-Element-Terminal-Sealing-and-Repair-Kit_p_2823.html Also, do you know what you need to order from OE or are you waiting for the machine to arrive and be inspected first? I am about to place an order...
  • I cleaned up the boiler and element today with some steel wool and can't believe the difference with hardly any elbow grease...
  • Is that boiler really as small as it looks?
  • About the size of a 1.25L coke bottle give or take...
  • Way bigger than it looks in photos then. I was thinking half that size. Seriously interesting machine for home use.
  • I received my first lot of goods from Orphan Espresso today including some of the pliars that aid in removing the lever pin clips so I dismantled cleaned and rebuilt the group tonight, replacing all the seals. Considering the last set of seals went in around 2007 they were still in very good condition. I used very fine steel wool to clean out the pistion cylinder and now have no more seazing on the lever movement. Next up on the agenda is to sand back and repaint the frame and outer case on the weekend, get out the dremel to clean all bolts, caps etc and spend some time prepping the base plate and boiler for installation of the gasket. Not sure how "clean" these two parts will need to be but wll do the best I can. The old gasket was a pain in the rear to remove and still some miniscule remnants there... I had ended up using 60 grit sand paper to remove the dreggs and will probably go through a progression of 12, 240, 400, 800 before the gasket goes in. This '74 model requires the boiler to be removed from the frame completely to get access to one of the nuts on the base plate so I want to get it right the first time. I need to source a strain relief plug for the power cord but they are "unobtainium" according to OE. Mine is not coimpletely trashed but had a very small piece broken off before I removed it and apparently putting them back in is harder than getting them out. Anyway, I'll upload some pics tomorrow of the work I have done... And, one question re my DMM. I have the CS DMM that I use for roast monitoring, and want to test the element before putting it all back together but I have never used a MM before.... So, if I set it to Ohm's and put one lead on each terminal of the element, what sort of readout should I expect? Pretty sure mine is 49.5 or thereabouts...
  • It's alive!! I painted the frame today with 2 coats primer and 2 coats satin black. When I got home at 6pm I started the rebuild and currently have some citric soaking in the boiler. After seeing the crap on the inside of various parts I can't believe I dared to taste several coffees prior to ripping it apart. The boiler was black on the inside and the steam tap was coated in stuff that looked like bong resin and thats not to mention the chewed fingernail that fell out of the group when I dropped the piston out! Anyhow, not long now and I will be seeing just how good these machines can be...
  • Well there goes my breakfast... :( Are you in a bio-hazard suit AM??
  • Oh man, I just threw up in my mouth  :o
  • Someone that's clueless thought hmmm I will brew up a coffee and hmmm ?? lets see the beans must go here  :head: :head: Unfortunately along with similar designs the Cremina has a water filler plug on the boiler that lends itself for such an occurrence to happen KK
  • AM: Your boiler is pure disgust. Muscles: I know I'm a bit late, but if you see my thread on the reconditioning of terminal elements, I used Selleys Fridge Enamel as sealant over a high temp epoxy from Bunnings, which is still looking brand new about 6 months later, so it can handle the heat.
  • AM, I'm interested to know more about the contents of that boiler. When your ready, A.
  • That's putrid AM, hey show me your parts list before you order any... RM, cheers mate but all looking good so far. Now I can say I know what all the fuss is about with levers, there is a massive difference in the cup between the BDB and this baby, so many extra flavours
  • on 1333763643:
    Mind you a few purges first I think  :thumb:
    I think I'd be purging with Sulphuric acid.
  • I've been playing with temp and pressure on the Cremina using this as my guide: http://www.freshcoffeeshop.com/Coffee/en/espresso/olympia-cremina I have a pressure gague that connects to my steam wand and have been using my thermocouple and DMM. The DMM Temp  reading when attached to boiler is 112 deg C while pressure gague is readin 0.85 bar. Can anyone tell me if I should expect a loss in pressure when measuring at the wand in stead of direct on the boiler? - My thoughts are that as long as I have no leaks the pressure throughout should be the same. Measuring the pressure via gague only at pre-rebuild settings showed a pressure reading of 0.5bar. The boiler now cycles a lot more often than it did before and the steam has a LOT more grunt to it. I'm liking the new steam wand and removable tip, but hard to tell if it is me, the tip or the pressure that is resulting in better texturing of the milk...
  • on 1333805575:
    Boyle's law is the answer to the first part.. And even with a leak in the system = see  Boyle's law
    Cool thanks, just what I needed...
    NOW remember the golden rule...  IT's the cup that counts not the numbers
    yep, 2 + 2 =5 ;)
  • Not harsh at all... teach a man to fish I say!  :pan How are all your seals? Mine is so much smoother to use after the new seals were put in along with a decent amount of Dow 111.... Also, where did you buy yours? Craigs List? I don't imagine it was from CG or HB... or was it?!
  • Ooh go the 1200w breville, it would have to be 20% faster :D
  • Go the 1200, pimp it good :thumb:
  • Great Stuff mate, sorry I missed your last reply... I find the machine too light as well and can tilt it back when raising the lever. Temp management I found wasn't really a problem but I was only pulling 2 shots at a time (set mine using the steam wand gauge from Orphan to 8.5bar) For such a small machine the steam is terrific! And I reckon the upgrade to the new wand is worth doing - I won't bother looking at a swivel wand (has been done before) as I want to keep factory parts on mine. After machine has cooled I move the lever back up for rest position and much prefer the Elektra double over the Olympia single and these are the only two baskets I've tried. (Elektra from Orphan - NOT COFFEEPARTS - wrong size from them) Dying to get my new sight glass in the post so I can continue on with the lever journey...
  • I should have mentioned that I was draining boiler completely after each use so handle up for me was no prob! Oh yeah, how small is the drip tray!! That and no cup warmer... saw a few custom mods for those but I don't have fabricating skills or the coin to make it happen...
  • Oh and steaming much easier and quicker with newer tip  :thumb:
  • on 1334991335:
    Why would you drain after use ? What happened was that as pressure built up, with the handle up, the pathway is open.  So hot water streams into the head and out into the PF and then out the two spouts....
    Figured that was what happened ;) I was only filling 2/3's before use, warming group, making two shots and steaming milk. After that was running most of the water through to clean out any fines from the piston cylinder/chamber. By this stage the boiler was approx 1/4 full so I would drain the last remnants and lift lever (looks much better when resting up)... I didn't like the idea of reheating the same water again as my lever use was days apart, most likely only on weekends for now anyway.
  • ??? Lever Erectus. Is that where the lever becomes erect without any 3rd party involvement/stimulation? I did see that simply turning mine on one day literally turned it on.... Wasn't gonna say anything in case you all thought I was nuts  ::) As for grind, I was using exact same grind as I do for BES900 with no probs. Not sure if that will help you at all... will take a photo tomorrow with a 10c piece for size reference - off to bed now.
  • on 1335099883:
    I will never get it as the anti-vac valve takes care of false lever erectus and it only goes up when handled.
    Ummmmmm.... hooooowwwlll?!?!?  :(  ???  :P
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