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#1
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Fighting WVO residue in prechambers
5 years ago right after buying my 87 300D with a #14 head I bought a used #17 head just in case. Now that the #14 is blowing smoke out the coolant bottle, its time to rebuild that spare #17 head and pop it in. The seller failed to mention that the #17 head was heavily coated in WVO residue. I got the injectors out pretty easily but but the collar nut won't budge. I'm using acetone to dissolve the WVO goo which is pretty damn effective but the nuts aren't coming out. All the torque in the world and even an impact gun can't do it. I only removed 1 nut and damaged it in the process. I can deal with all the visible WVO residue but I think its down in the threads and I can't get to that stuff with acetone, it evaporates too quickly. I need some better ideas before I start doing real damage to this thing. Yes I, using the correct screw in collar nut tool.
The one on the left is cleaned out with acetone and not coming out. You can see where the keyway in the nut is getting bent because I'm applying so much torque to it. The one on the right isn't cleaned out yet. Ideas?
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CENSORED due to not family friendly words Last edited by tjts1; 02-27-2018 at 02:32 PM. |
#2
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The idea that WVO is all upside is, obviously, wrong. While Diesels can run on a lot of different fuels each has its downsides (for Diesel fuel it's the cost).
Anyhow, it might take some serious heat to get those to move. Again, upsides and downsides. Heat moves pretty much everything but too much in too concentrated a spot can cause cast iron to crack. So try as little as necessary and if you need a TON of heat plan to use the torch and slowly allow the area to cool back down. You may still need the impact but at least the bond will be broken. Good luck! Dan |
#3
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i'd go with a little Blaster
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Current fleet 2006 E320 CDI 1992 300D - 5speed manual swapped former members 1984 300D "Blues Mobile" 1978 300CD "El Toro" |
#4
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Try saturating with some methanol or Kroil first.
Jeff
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1984 300SD 300,000 miles--two tank WVO setup 2.88 diff & 500SEL anti-squat rear end |
#5
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What prechamber lock ring tool are you using?
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84 300D, 82 Volvo 244Gl Diesel |
#6
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Those nuts are bastards. I used the correct tool and still killed half of them.
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$60 OM617 Blank Exhaust Flanges $110 OM606 Blank Exhaust Flanges No merc at the moment |
#7
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Dan is spot on, heat is your friend here. Think about heating the head in a tank of water, mounted in such a way that you can put some torque on it, or be able to quickly extract the head from the hot bath and then apply torque. Another approach would be put the head into an oven (gas fired bar-b-q?) and bring up the temperature that way. Safety is a big issue with either approach.
Aluminum is very good at transferring heat, so only heating a small area with a torch is very hard to do.
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Respectfully, /s/ M. Dillon '87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted '95 124.131 (E300) "Sapphire", 380k miles '73 Balboa 20 "Sanctification" Charleston SC |
#8
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Alternatively, I'd think about a method to clean out the residue short of removing the pre-chambers, like having a shop hot-dip the head. Probably will need to do that anyway to clean out the oil and coolant passages.
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Respectfully, /s/ M. Dillon '87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted '95 124.131 (E300) "Sapphire", 380k miles '73 Balboa 20 "Sanctification" Charleston SC |
#9
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Tightly twist in a cotton rag into the injector hole.
Apply 50/50 Acetone ATF mix (great cheap penetrant) to the rag. Can't get Kroil in CA. The next day, use a brass bottle brush to scour out the residue. Repeat the above steps until the threads are clean. After the collars are clean, apply heat and impact gun to aid in removing the lock collar. If the lock collar gets FUBARed switch to an air chisel
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78 W116 300SD 'Desert Rose' new as of 01/26/2014 79 W116 300SD 'Stormcloud' RIP 04/11/2022 |
#10
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Why the pre-chamber needed to be removed? Spray some simple green and leave it over night. Use a small brass brush to clean out the injector thread. Blow out debris with compress air. Done IMHO. Others may beg to differ.
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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed. W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html 1 X 2006 CDI 1 x 87 300SDL 1 x 87 300D 1 x 87 300TDT wagon 1 x 83 300D 1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry. |
#11
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Thank you to everyone for all your suggestions. A friend came over and after seeing the problem I was dealing with he laughed at the size of my breaker bar. I thought a 2.5 foot breaker bar was perfectly adaquite but apparently not. A 5 foot cheater bar (hydraulic floor jack handle) did the trick. Lesson learned: size matters.
https://i.imgur.com/xPsWmyM.jpg I tried that along with just about every other solvend I had stashed in the garage. This one. Ipicked it up on eBay a long time ago, don't remember the seller. Because these prechambers are just as filthy on the inside, and I want to have it resurfaced. I'll probably end up reusing the prechambers from the #14 head. Even the valves looks pretty awful although I haven't found any damage to the seats. Just need a cleanup I think. Is there any special considerations when having an om603 head resurfaced other than removing the prechambers and valves?
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CENSORED due to not family friendly words Last edited by tjts1; 02-27-2018 at 06:59 PM. |
#12
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There ya go. More POWER! And a beer
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Current fleet 2006 E320 CDI 1992 300D - 5speed manual swapped former members 1984 300D "Blues Mobile" 1978 300CD "El Toro" |
#13
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Quote:
The head does not need to be perfectly flat, per the FSM, so I'd make sure that a re-surface is even needed. Aluminum will allow a certain amount of flex when torqued down, more than what an iron head would.
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Respectfully, /s/ M. Dillon '87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted '95 124.131 (E300) "Sapphire", 380k miles '73 Balboa 20 "Sanctification" Charleston SC |
#14
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Quote:
This does work for MANY tough jobs. Also, if you have a container large enough to hold the head (like a pan with top, consider using xylene instead of acetone. Don't smoke and do it outside.
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Strelnik Invest in America: Buy a Congressman! 1950 170SD 1951 Citroen 11BN 1953 Citroen 11BNF limo 1953 220a project 1959 180D 1960 190D 1960 Borgward Isabella TS 2dr 1983 240D daily driver 1983 380SL 1990 350SDL daily driver alt 3 x Citroen DS21M, down from 5 3 x Citroen 2CV, down from 6 |
#15
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Quote:
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
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