[MBZ] 300TD engine shut-off (or not)
Hi there colleague Benzers My 300TD has started to run on when I switch off. Because this happens mostly when the engine is cold and grumpy, I'm assuming (based on a recent thread) that it's a vacuum problem. I'm completely ignorant of how the pneumatic system shuts the engine down, so I'd be grateful if anyone knows where to start looking for the leak. Thanks Euan 1985 300TD 5-spd manual 203K mi
Re: [MBZ] 300TD engine shut-off (or not)
The first step would be to find a vacuum diagram. Maybe someone has the CD for this vehicle and can send you a copy. Tom Potter -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Euan Sent: Thursday, October 12, 2006 2:13 PM To: mercedes@okiebenz.com Subject: [MBZ] 300TD engine shut-off (or not) Hi there colleague Benzers My 300TD has started to run on when I switch off. Because this happens mostly when the engine is cold and grumpy, I'm assuming (based on a recent thread) that it's a vacuum problem. I'm completely ignorant of how the pneumatic system shuts the engine down, so I'd be grateful if anyone knows where to start looking for the leak. Thanks Euan 1985 300TD 5-spd manual 203K mi ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] 300TD engine shut-off (or not)
Euan, I had the same problem. Contact me off list for assistance. Cheers! -Michael -Original Message- From: Euan [EMAIL PROTECTED] Sent: Oct 12, 2006 3:13 PM To: mercedes@okiebenz.com Subject: [MBZ] 300TD engine shut-off (or not) Hi there colleague Benzers My 300TD has started to run on when I switch off. Because this happens mostly when the engine is cold and grumpy, I'm assuming (based on a recent thread) that it's a vacuum problem. I'm completely ignorant of how the pneumatic system shuts the engine down, so I'd be grateful if anyone knows where to start looking for the leak. Thanks Euan 1985 300TD 5-spd manual 203K mi ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com Nobody loves me like my mother, and she could be jivin' too. - B. B. King
Re: [MBZ] 300TD engine shut-off (or not)
Euan wrote: Hi there colleague Benzers My 300TD has started to run on when I switch off. Because this happens mostly when the engine is cold and grumpy, I'm assuming (based on a recent thread) that it's a vacuum problem. I'm completely ignorant of how the pneumatic system shuts the engine down, so I'd be grateful if anyone knows where to start looking for the leak. Unfortunately, the leak can be damn near anywhere. I had the same problem when I first got my 300CD, and the problem turned out to be a bad vacuum cylinder in the trunk lock and the harness of the Climate Control system being completely rotted out where it squeezes past the battery. Unless there is something glaring to tip you off (door locks that don't work, vacuum lines to nowhere) you will need to get yourself a MightyVac and start checking lines one by one. RE the MightyVac, the plastic ones are shite- I blew good money on a plastic piece of junk which already needs to be replaced so I will be looking for a metal one at Sears. These might help- http://www.dieselgiant.com/mercedesvacuumtroubleshooting.htm http://articles.mbz.org/interior/vacuum/ Lee
Re: [MBZ] 300TD engine shut-off (or not)
Howdy - Here's a place to find your vacuum Diagram - http://www.peterschmid.com/ - get yours and study it. But only worry about the part that controls the engine - not the door locks and that stuff. Basically, a vacuum pump on the front of the engine produces vacuum which operate the power brakes, engine shutdown and some accessories. A vacuum line runs between the pump and brake master cylinder area - there's a T in the line which provides vacuum to the ignition switch. When the engine is shutoff, the vacuum that is controlled by the vacuum switch pulls vacuum on a engine shutoff switch located on the Injection Pump (often). When the Shutoff Switch is actuated, fuel thru the IP is stopped so fuel no longer reaches the cylinders thus stopping the engine. Sometimes, insufficient vacuum is produced to pull the shutoff switch back into position to stop the fuel flow. This can be caused by a vacuum leak, a failing vacuum pump or a failing shutoff switch. When this happens the engine runs at a slow speed until eventually stopping. To check some problems, you should have a MityMite Hand Operated Vacuum Tool (about $30 at Walmart) - which allows you to provide vacuum to different places to see how they act. Depending on how they act you can determine if they are getting proper vacuum. Sometimes, the vacuum lines going to and from the ign switch fail with age - sometimes the vacuum portion of the ign sw fails - often the shutoff switch on the IP fails - this can be checked by starting the engine and applying vacum to the switch - if the engine stops the switch is good - if not the switch is bad. Changing the switch (~$60 from Rusty) is not difficult - but much caution must be used to prevent installing it incorrectly - it can cause the engine to run at max speed until it seizes - turning the key off will not stop it - only disconnecting the fuel or stopping air flow will stop it - until it seizes of course. Not pleasant. That will hopefully get you started - good luck - let us know how it goes - Larry T (67 MGB, 74 911, 78 240D, 91 300D) www.youroil.net for Oil Analysis and Weber Parts Test Results http://members.rennlist.com/oil PORSCHE POSTERS! youroil.net Weber Carb Info http://members.rennlist.com/webercarbs Porsche Road Test http://members.rennlist.com/roadtest/ . - Original Message - From: Euan [EMAIL PROTECTED] To: mercedes@okiebenz.com Sent: Thursday, October 12, 2006 3:13 PM Subject: [MBZ] 300TD engine shut-off (or not) Hi there colleague Benzers My 300TD has started to run on when I switch off. Because this happens mostly when the engine is cold and grumpy, I'm assuming (based on a recent thread) that it's a vacuum problem. I'm completely ignorant of how the pneumatic system shuts the engine down, so I'd be grateful if anyone knows where to start looking for the leak. Thanks Euan 1985 300TD 5-spd manual 203K mi ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.408 / Virus Database: 268.13.2/472 - Release Date: 10/11/2006
