[MBZ] testing my mercedes 300td AC
Folks i've been out testing the 82 300TD AC and car. I replaced the r4 compressor again about 2 weeks ago. Last week i dragged a 1500 lb printing press to Tupelo, MS from athens, ga relatively uneventfully. As i left there i had no vacuum or boost on the brakes. Fortunately, the trailer was unladen on the return trip. Back in athens, i was preparing to change the vacuum pump but got the idea to blow out the check valve of the pump. I had already flushed it with some solvent. I blew it out with the air hose last week and i've had good boost ever since. So, Tuesday afternoon, i went out for another test. I drove 600 miles to indianapolis, in. There i picked up a 1000 lb press and probably 500 lbs of lead type. I turned around and left indy about 5 pm wednesday and made it back to athens about 4 am. I stopped at the i-75 georgia welcome center about 1 am and made some coffee. When i started back up the starter made a weak GRRR sound and barely turned the hot engine over … which fortunately started instantly. I decided, wisely, that i shouldn't shut it down. I had some much crap in the car that i couldn't have much hope of finding the meter, so i never checked for charge. As i was on the home stretch about 10 miles out, i noticed that the lights dimmed slightly when i put the AC blower on high fan. When i got home, the starter wouldn't turn the engine over. i am charging the battery now to start it and check the charging. The alternator belts are tight and i guess i should check the rear wires to the alternator. So, AC test successful …. alternator test, less successful. I drove about 2000 miles in the last 8 or 9 days …. 1000 miles dragging 1500 lbs … ac works brake vacuum still good and maybe i'm not charging. Had i realized that i wasn't charging, i'd have unplugged one headlight to diminish the load on the battery Not doing anything special i seem to have had 3+ hours of running with radio and AC and lights, etc …. which is pretty good. thanks, xx rick Rick Hawkins www.javaphoto.com www.javacycles.com LETTERPRESSES FOR SALE www.ricktheprinter.com www.letterpressmachinery.com ___ http://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
Re: [MBZ] testing my mercedes 300td AC
In a complete absence of facts I'm going to guess alternator. In my limited experience when the regulator fails you get a light but the alternator can fail without it. Fortunately they're relatively easy to change... -Curt From: Rick Hawkins Java via Mercedes <mercedes@okiebenz.com> To: "mercedes@okiebenz.com List" <Mercedes@okiebenz.com> Cc: Rick Hawkins Java <macj...@aol.com> Sent: Thursday, September 24, 2015 3:28 PM Subject: [MBZ] testing my mercedes 300td AC Folks i've been out testing the 82 300TD AC and car. I replaced the r4 compressor again about 2 weeks ago. Last week i dragged a 1500 lb printing press to Tupelo, MS from athens, ga relatively uneventfully. As i left there i had no vacuum or boost on the brakes. Fortunately, the trailer was unladen on the return trip. Back in athens, i was preparing to change the vacuum pump but got the idea to blow out the check valve of the pump. I had already flushed it with some solvent. I blew it out with the air hose last week and i've had good boost ever since. So, Tuesday afternoon, i went out for another test. I drove 600 miles to indianapolis, in. There i picked up a 1000 lb press and probably 500 lbs of lead type. I turned around and left indy about 5 pm wednesday and made it back to athens about 4 am. I stopped at the i-75 georgia welcome center about 1 am and made some coffee. When i started back up the starter made a weak GRRR sound and barely turned the hot engine over … which fortunately started instantly. I decided, wisely, that i shouldn't shut it down. I had some much crap in the car that i couldn't have much hope of finding the meter, so i never checked for charge. As i was on the home stretch about 10 miles out, i noticed that the lights dimmed slightly when i put the AC blower on high fan. When i got home, the starter wouldn't turn the engine over. i am charging the battery now to start it and check the charging. The alternator belts are tight and i guess i should check the rear wires to the alternator. So, AC test successful …. alternator test, less successful. I drove about 2000 miles in the last 8 or 9 days …. 1000 miles dragging 1500 lbs … ac works brake vacuum still good and maybe i'm not charging. Had i realized that i wasn't charging, i'd have unplugged one headlight to diminish the load on the battery Not doing anything special i seem to have had 3+ hours of running with radio and AC and lights, etc …. which is pretty good. thanks, xx rick Rick Hawkins www.javaphoto.com www.javacycles.com LETTERPRESSES FOR SALE www.ricktheprinter.com www.letterpressmachinery.com ___ http://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 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
Re: [MBZ] testing my mercedes 300td AC
Way-to-go on the AC compressor, sounds like you've got that buttoned down. I checked the alternator harness connector by hooking up my meter with some long test leads so I could lay under the car and see the meter. Front end up on ramps and on a 124 there is easy access to the alternator and harness, don't know about a 123.193. I started the engine and watched the meter, and it immediately jumped from ~12.5 volts up to ~13.6 when I touched the harness, and simultaneously there was a click from the alternator and the engine slowed down slightly as it picked up the electrical load on the alternator. You could also tap on the alternator to see if the brushes need coaxing to make contact, and then maybe all you need is a new regulator assembly (has new brushes). I had a long-term oil leak from the front crank seal that had coated the engine front including the alternator with oil, so I took the alternator entirely apart a couple years ago and cleaned all that up, especially focusing on the internal contacts from rectifier bridge to alternator body and the same for the voltage regulator. Don't forget that you can get the alternator tested for free at FLAPS, the O-Reilly's in town here has the best test equipment and people who are actually trained in using it. - Max Charleston SC ___ http://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
