Long time ago, but I changed mine (82 300SD) without removing any coolant lines, as I recall. Also be sure to clean out the carbon in the hole before installing new glow plugs.
The glow control may (or may not) be working without the light. The light is for the driver and is somewhat independent of the voltage to the glow plugs. An inop light usually means something wrong with one or more glow plugs. You did check the fusible link in the glow box on the left inside fender? Hairline cracks in that link can be hard to see until you loosen one of the screws (and half of the fuse falls off). -----Original Message----- From: mercedes-boun...@okiebenz.com [mailto:mercedes-boun...@okiebenz.com] On Behalf Of Hans Neureiter Sent: Monday, October 29, 2012 4:27 AM To: Mercedes Discussion List Subject: [MBZ] Glows My old 300SD became hesitant to start lately. Lots of smoke for the first minute or so. No Preglow light. Tested the plugs and found #1 dead. I attempted to change all the plugs but gave up after #1 (Light comes on again). I removed the fuel lines between the delivery valves and injectors but could not figure out how to reach #5 plug. Coolant return line from heater and filter housing in the way. Two questions: Is it possible to replace #4 & 5 plugs without removing the obstructions? Does the preglow system work in spite of no indicator lght? -- Hans Neureiter, Katy, TX '82 300SD '01 VW New Beetle 1.9L TDI _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com