Πως βάφω τον "καθρέφτη" της μηχανής που έχει ψωριάσει !!!

[eliso]

Επειδή πέρυσι έπαθα και εγώ εγκεφαλικό όπως ο φίλος http://www.gsforum.gr/%CE%A4%CE%B5%C...A%CF%8C-29202/
έκανα οτι βλέπετε στις φωτογραφίες και μου βγήκε ένα πολύ καλό αποτέλεσμα. Όχι το ίδιο όπως οι φώτο αλλά πολύ καλύτερο από αυτό που ήταν πριν. Το βάζω εδώ για να το κάνει όποιος θέλει.
Ένα πρόβλημα είναι οτι θέλει χώρο για 2-3 μέρες και άλλο ένα οτι πρέπει να είσαι συνέχεια ανάσκελα.
Όποιος έχει τρόπο να σηκώσει την μηχανή ψηλά είναι θεός.Γιατί το ανάσκελα συνέχεια δεν παίζεται

R1200GS front engine cover corrosion - poor design, bare aluminium/alloy, poor paint coating = guaranteed corrosion! Just a few months later and I removed the black plastic belt cover to check the state of the replacement engine cover...

I've coated the whole 'at risk' area in Waxoyl (alternatively use ACF50) and have removed the foam rubber 'sound deadening pad' that sits within the black plastic belt cover (and traps dirt, road salt and moisture!) now to hopefully halt the corroding process but will keep a close eye!
Top TIP: If it's still in place (many BMW Dealers ditch it!;-) remove the foam rubber 'sound deadening' pad - no noticeable effect on engine noise :shrug: .......this is a major contributor to the corrosion problem ;-)

Prevention:

• Remove the sound deadening pad if installed
• Remove the black plastic belt cover occasionally to remove accumulated dirt, road salt etc
• Coat vulnerable areas beneath the black plastic cover in Waxoyl or ACF50

Corroded R1200GS Front Engine Cover Repair & Painting

To get the best results you'd need to remove the engine cover (BMW refer to 'gear case cover') but doing that is a pretty big job. You would have to drain the engine oil and to get the casing off, remove the crankshaft pulley that drives the alternator belt (not easy without a special tool to hold it while you undo the large nut - final torque 140 Nm;-) The cover should then pull forward with both bearings still in the cover (crankshaft and timing gear) provided you've undone all the bolts around the cover! You would need to replace the oil seal in front of the timing cover bearing before reassembly to be on the safe side. Belt pulley to crankshaft M22 x 1.5 Initial torque, 40 Nm Final torque, 140 Nm
Belt cover (black plastic) to engine
5 screws (M5 x 16) - torque 5 Nm
Bearing cap, front auxiliary shaft on
timing case cover
4 bolts (M6 x 20) - torque 8 Nm
Front engine cover (gearcase cover)
to crankcase
16 of (M6 x 30) - torque 8 Nm

So, repair and repaint in situ it is then :-)
What you'll need:
Paint Stripper
'Wet & Dry' fine grade sandpapers
Acid Etch Primer (e.g. from Halfords - U-POL Etch Primer)
NB: Acid etch primers give better adhesion to aluminium, ordinary primer will not bond permanently to the aluminium surface;-)
Wurth paint & lacquer
Stainless Steel Replacement Bolt kit (optional)

Wurth clear lacquer, Wurth silver alloy wheel paint, U-Pol acid etch primer
and Nitro Mors paint stripper

'Wurth German Alloy Silver Wheel Paint Lacquer' topped off with the same company's clear lacquer gives a paint finish that is pretty close to the BMW factory original finish and it seems pretty durable. One source of the paint is Performance Motor Care
R1200GS Front Engine Casing Repair & Painting
by ukGSer Phil 'the beer hunter' Dec2009

See also: ukGSer forum thread Front cover corrosion pics for info on how 'Easyrider5258' went about the same job on his BMW R1200RT
Winter's here so it's time to do something about my flakey engine casing on my 1200GS!
I'm in no rush so I'm taking my time.
I've ordered Wurth paint & lacquer so I can't really get stuck in before that arrives. There's a set of A4 marine grade stainless bolts on the way too.

Day 1:
Assessed the situation.

Removed the crashbars & sump plate. (AndyW: I found that I can remove the black plastic belt cover without removing crashbars, may depend on brand, I have Hepco & Becker bars. Removal may be best for 'space' depending on how big a paint job you have to do)

Made a start removing loose paint.

....some of which came off in large flakes!

Remove the 12 lowermost securing bolts from the engine casing (or as many as required for your repair job). I replaced all the original items with stainless steel replacement bolts. The bolts around the casing are M6 x 30 (make sure you ask for Allen headed set-screws i.e threaded right up to the head).
TIP: Shaw Stainless Steel Fasteners do replacement bolt / fixing kits for the R1200GS and many other BMW motorcycles.
Day 2:
Take the paint back some more and clean.
I didn't have to take the front wheel out but I wanted to replace the tyre so now seemed like a good time and it did make life easier with more space to work in.
Made a start stripping back the paintwork. (Nitromors, £3.98 - B&Q )

I'll do this in stages because it's very boring and I want to do a decent job (and great care is required with the paint stripper!;-).
I'm just applying nitromors in small areas with a small brush & slowly working around the casing paying attention to removing all the paint around the mounting holes. The bolts are removed of course.

I realised today that all the weight is over the front so it won't balance on the mainstand without some support under the front. (note jack under engine, axle stand under front axle and DRZ wheels on the pillion area.)

Still waiting for the paint and lacquer to arrive so I'll finish off the stripping another day.
While I was stripping the paint I only removed 1 engine cover fixing bolt at a time and worked a small area to achieve a decent job. I found if I concentrated on little areas I got a better result. (When I came to spraying I removed the lower bolts in the visable area but kept a few upper bolts in situ).
Thanks to 'Easyrider5258' for the inspiration, info via PM and giving me a standard of preparation to aim for:
Easyrider5258's 1200RT

Day 3:

Stripped all the paint from the final visible area. Roughed up with some wet & dry fine sandpaper and cleaned. Ran the bike for a while to warm things up. Masked everything up.

Primed, painted and lacquered. (next three photos)
I spent a little over £35 on acid etch primer, paint & lacquer but only used 2 coats of primer and 3 or 4 coats of paint / lacquer

As soon as I peeled off the newspaper and masking tape I was impressed with the results :-)

Greased up the new stainless bolts and threw it all back together.
CARE: Greasing the bolts could result in over tightening due to reduced friction - personally [AndyW] I would assemble dry, torque to correct tightness and then spray ACF50 around the bolt heads to seal (once your new paint has had a few days to properly cure;-) Can't find any reference in the Manual :-(

I'm very pleased indeed!!....from this..

to this...

RESULT!! :-)

Από το Advrider.com