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Engine rebuild with no former experience........
- Racediagnostics
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My hose is marked Cohnen 370, and is ribbed, it looks different to yours. How did you establish the modern equivalent. I wonder if the size is the same for the 450 and 560?
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I will also try to repair the oil cooler hoses.
Cheers
Jim
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1979 450SL - 2002 XK8 4.2
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- Racediagnostics
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Comparison of the old and new seal.
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New seal inserted flush to the surface of the housing.
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From the rear you can see it sits well away from the worn groove.
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Next, more sorting.
Parts to be cleaned or cleaned and painted.
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Parts to be cleaned then zinc plated and yellow passivated.
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I think this lot will take me a few weeks to complete, so no updates for a while.
Cheers
Jim
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1979 450SL - 2002 XK8 4.2
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- Racediagnostics
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...a few more.
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The external head bolts were a bit corroded.
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Cleaned up on a wire wheel.
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Re-blued with "Birchwood Casey".
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After sitting in oil for 12 hours.
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The first batch of parts to be plated were cleaned up, this took most of today as they had so much caked on grease and dirt.
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Rust removal.
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These are the bolts that will be saved and re-plated, sitting in brake cleaner.
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Cheers
Jim
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1979 450SL - 2002 XK8 4.2
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- Racediagnostics
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Cheers
Jim
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1979 450SL - 2002 XK8 4.2
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- Racediagnostics
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The plating works best on polished parts so I used the wire brush on the first part, this should plate nicely. You can still see where the rust had pitted the surface but I can live with that.
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Cheers
Jim
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1979 450SL - 2002 XK8 4.2
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- Racediagnostics
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Finished polishing the parts from yesterday.
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Then polished the fuel pipes.
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Cheers
Jim
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1979 450SL - 2002 XK8 4.2
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- messerfloh
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Scheene Griaß
da Floh
450SLC ´75 Silbergrün
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- Racediagnostics
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I then moved on to the remaining nuts, bolts and brackets etc.
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More citric acid.
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Back to the PS pump, I tried an alternative approach, I held the pully in one hand and loosened the nut but kept it in place, then hit then end of the tapered shaft with a heavy copper hammer, after 4 increasingly heavy hits it freed off!
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Back to the fasteners, after the citric acid and wire wheel.
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Cheers
Jim
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1979 450SL - 2002 XK8 4.2
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- Racediagnostics
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Then removed the ends of the fuel hoses, fortunately they had not been crimped.
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These parts will be too large for me to plate, so will have to find a good plater locally.
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Cheers
Jim
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1979 450SL - 2002 XK8 4.2
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- Racediagnostics
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The power steering pipes.
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Heat shields.
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I hope this will be the last batch for citric acid.
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There are a surprising number of pipes and tubes that will need to be plated, these will all be too long for me to do at home, so I will get quotes from professional platers. If it is too expensive, I will plate the ends and then paint the main parts of the pipes.
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Does anyone know what is hidden in the rubber sheathed part of this hose?
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Cheers
Jim
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1979 450SL - 2002 XK8 4.2
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- Racediagnostics
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Then painted the fuel distributer. High Five (four).
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Cheers
Jim
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1979 450SL - 2002 XK8 4.2
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- Racediagnostics
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I am in two minds about what to do with the oil filter cannister. It is a bit of a mess but it would be a shame to loose the legend if I were to get it vapour blasted.
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Cheers
Jim
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1979 450SL - 2002 XK8 4.2
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- Thomas2509
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How long do you put the parts in the citric acid bath?
Let the oil filter canister like it is. It will look pretty good when there is a original part with "patina".
Greetings Thomas
Es grüßt herzlich
Thomas
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- Racediagnostics
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Some types of steel come out of the acid fairly clean and others come out with a black coating that has to be removed with detergent and an abrasive scotch pad.
Cheers
Jim
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1979 450SL - 2002 XK8 4.2
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- Chromix
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how do you heat the components? To a certain temperature or intuitively?
Regards,
Lutz
Alle Lebewesen außer den Menschen wissen, daß der Hauptzweck des Lebens darin besteht, es zu genießen.
Samuel Butler
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Cheers
Jim
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1979 450SL - 2002 XK8 4.2
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These are all the parts I cleaned, most need plated except the top row.
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I noticed this on the thermostat cover, do you think it is a poor casting or corrosion? Either way I'll look out for a replacement.
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Cheers
Jim
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1979 450SL - 2002 XK8 4.2
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- Racediagnostics
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The pod is a bit rusty but is functional and a replacement is more than £100, I couldn't dip in acid to clean off the rust and zinc for plating as it's not watertight.
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Instead I sanded it down and painted it.
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Then on to the WUR, just circular port area that was a bit rusty.
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Painted with newly plated ports.
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I hope that the plating will finally be completed tomorrow.
Cheers
Jim
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1979 450SL - 2002 XK8 4.2
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- Dr-DJet
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well doen on ignition distributor. On WUR port area is actually raw. So I only polish t and use some transparent paint on it. But you have to keep ports and ring area around it clean to ensure that copper rings can seal afterwards. I also made some brass replacement for the adapters on top so that they will never rust again.
Viele Schraubergrüße - best regards, Volker, Admin und Betreiber dieser Webseite
Fast alles zu Zündung und Jetronic auf jetronic.org
Jubiläum 10 Jahre Jetronic.org mit Besuch bei Bosch Classic Jetronic Instandhaltung in Nürnberg am 18.10.24
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- Racediagnostics
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And on top of that there is the 400+ new nuts and bolts.
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Cheers
Jim
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1979 450SL - 2002 XK8 4.2
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- T-Modell
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that's a great result of your galvanising ... so you did it yourself? Took the brush, the gold colour of your kid's watercolour box and started?
Regards and good luck with the rest of your work
Thomas
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- Racediagnostics
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Cheers
Jim
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1979 450SL - 2002 XK8 4.2
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- Chromix
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how did you do it? Or did you write about this before? I don't remember .....
Regards,
Lutz
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Samuel Butler
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- Seewolf107
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I did a lot of parts myself too.....it is extremly time consuming and the setup is not cheap.
Grüsse Claus
1966 Plymouth Belvedere 383, 300D 1983, 280CE W123
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Four 10l tanks for dipping and four buckets for rinsing. All tanks have 30 degC heaters in and the plating tank also has a circulating pump/filter.
Tank 1 is a caustic cleaning solution to remove grease. Leave parts in here till very clean, then rinse.
Tank 2 is 100g of Sodium Fluoride + 900g of Sodium Hydrogen sulphate for etching. Parts stay in here for 30 seconds prior to plating, then rinse.
Tank 3 is 200g of Zinc Chloride + 1200g of Ammonium Chloride, + 4 zinc electrodes + a bench power supply. Parts stay in here for 45 minutes at ~ 70mA per sq inch.
Tank 4 is 600g of Sodium Dichromate + 25ml of conc sulphuric acid.. Once parts are plated, I rinse them first, dip for 4 seconds in Tank 2, then rinse again, then dip in tank 4 for 4 seconds and then rinse again. The parts are then left for 48 hours for the passivation coat to harden.
Cheers
Jim
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1979 450SL - 2002 XK8 4.2
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- Chromix
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I don't want to bicker but on the bucket for tank 4 you wrote 10 to 50 seconds, not 4 seconds .....
And what kind of caustic cleaning solution is this? Caustic soda?
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Lutz
Alle Lebewesen außer den Menschen wissen, daß der Hauptzweck des Lebens darin besteht, es zu genießen.
Samuel Butler
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Cheers
Jim
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1979 450SL - 2002 XK8 4.2
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- Chromix
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How do you do the plating? Probably not part by part. So many parts in the tank that they don't touch each other? + to the zinc and - to the parts?
Regards,
Lutz
Alle Lebewesen außer den Menschen wissen, daß der Hauptzweck des Lebens darin besteht, es zu genießen.
Samuel Butler
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- Racediagnostics
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SODIUM CARBONATE 250g
SODIUM TRISILICATE 250g
SODIUM HYDROXIDE 400g
Here are a couple of examples. Negative electrode to the parts to be plated, positive electrode to the zinc plates.
Small parts were plated together, larger parts by themselves. The long fuel pipes were plated partially in two session.
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Some parts come out shiny, others dull. The parts that come out dull are lightly rubbed with fine wire wool to bring out the shine before being dipped in the acid, then chromate.
Cheers
Jim
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1979 450SL - 2002 XK8 4.2
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- Racediagnostics
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First a quick dip in the acid pickle, rinse, then dip in the chromate.
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Power steering cooler hoses.
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Cheers
Jim
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1979 450SL - 2002 XK8 4.2
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