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#1
11-08-2008, 06:34 PM
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Removing valve covers 560SL
Started removing the valve covers on my 560SL tonight to replace the cam oiler plastic bits and do the chain guides. Ran into a question on the driver's side valve cover. See attached photos. It looks like both the hard line for the brake booster shown in the first photo and the two lines that appear to connect to the AC line (shown in the second photo) have to come off. I suspect that there is no issue with the booster line since my guess is that it is a vacuum line only and will not cause me to have to bleed the brake system. However, what about the two lines connecting to the AC line? What are they and do they have to come off? Will that open up my AC system and cause me to lose all my R12?
Thanks. Len
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Len '59 220S Cabriolet-SOLD and living happily in Malta '83 240D 351,500 miles original owner-SOLD '88 560SL 41,000 miles - totaled and parted out https://sites.google.com/site/mercedesstuff/home '99 E300 turbo 227,500 miles '03 SLK320 40,000 miles - gave to my daughter '14 Smart electric coupe 28,500 miles '14 Smart electric cabriolet 28,500 miles '15 Smart electric coupe 28,000 miles 
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#2
11-08-2008, 07:02 PM
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The brake booster line is for vacuum only, and will not cause any problems removing it. The other two lines are fuel lines for the fuel cooler. The 560SL has a fuel cooler in the A/C refrigerent line. You can disconnect those two small lines without affecting the A/C system. Be careful as there could be residual fuel pressure in the lines, but once you break the coupler loose and bled it off, no big deal after that. Don't unscrew the large nuts, as that indeed will cause the refrigerent to leak out.
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#3
11-08-2008, 08:21 PM
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I did the same work on a 560 SEL engine. Shortly after disconnecting the fuel cooler lines,the fuel supply line was leaking fuel. After removing the gas cap the fuel stopped leaking. This prompted me to reconnect the the 2 fuel lines after the rocker cover was removed. I didn't think the fuel would travel uphill from the tank, but it did. There are some very good posts on timing chain work on this forum. Go very slow and take your time. If you need parts call PHIL he is very familiar with the parts you will need. GOOD LUCK
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#4
11-09-2008, 07:04 PM
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Thanks for the help guys. Both valve covers are now off - had very little fuel spillage. Maybe it's because my tank is nearly empty - I have plans to drain the tank and replace the fuel filter and all the rubber hoses back there once I finish up with the chain guides.
Len
__________________
Len '59 220S Cabriolet-SOLD and living happily in Malta '83 240D 351,500 miles original owner-SOLD '88 560SL 41,000 miles - totaled and parted out https://sites.google.com/site/mercedesstuff/home '99 E300 turbo 227,500 miles '03 SLK320 40,000 miles - gave to my daughter '14 Smart electric coupe 28,500 miles '14 Smart electric cabriolet 28,500 miles '15 Smart electric coupe 28,000 miles
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