Dont know if i trust the mechanic????
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Dont know if i trust the mechanic???? - 12/4/2007 10:15:09 PM
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tanner
Posts: 5
Joined: 12/4/2007
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I just got a 81 300SD and i took it to the shop and the mechanic said a few things i wasnt to sure about. He said there was a lot of oil in the airfilter probably from a bad ring on one of the pistons? He also claimed that i needed a thermostat replacement even though my car doesnt run any more than a click over the 80C mark. I figured a thermostat is either good or bad right ? and wouldnt need replacing if it was keeping cool. My glow plug light does not come on and he said that i needed to replace the glowplug relay. It starts easy though so im thinking it really could be the relay and not a glow plug. Could anyone tell me if these things are really the problem and that im not being misled. Thank You for your help!
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RE: Dont know if i trust the mechanic???? - 12/5/2007 5:17:29 PM
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guage
Posts: 21
Joined: 1/5/2006
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I don't own a SD; I have a 300D the air filter housing gets a tad of oil residue in it.
The thermostat appears to be holding the correct engine temp.
I doubt the relay is bad more likely a bad glow plug, or the flat blade 80A fuse in the relay box.
I believe if you left the hood, cycle the glow plugs and stand beside the driver’s front wheel in 45 seconds to a minute you should hear the relay click off
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RE: Dont know if i trust the mechanic???? - 12/5/2007 9:16:42 PM
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compress ignite
Posts: 9
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The fact that he suggested replacing the Glow System Relay without further diagnoses
tells me you need to find a competant Independant Mechanic FAST!
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RE: Dont know if i trust the mechanic???? - 12/5/2007 9:32:25 PM
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tanner
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So today i did test all the glow plugs on the car and all seem to be working fine. I also heard the little click that the glow plug relay does after about 30 seconds or so. Assuming that im hearing the right clicking sound from the relay wouldnt that mean its infact ok and could possibly be just my glow plug light on my dash that is inoperative?
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RE: Dont know if i trust the mechanic???? - 12/6/2007 3:22:01 AM
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ForcedInduction
Posts: 858
Joined: 5/20/2006
From: Federal Heights, Colorado
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It could also be a bad light in the instrument cluster.
Really, RUN from that guy. Oil in the air filter housing is 100% normal, it is a byproduct of the crankcase vent system and a less than efficient oil separation system built into the filter housing.
That mechanic is simply trying to take advantage of you.
< Message edited by ForcedInduction -- 12/6/2007 3:23:26 AM >
_____________________________
1980 240D 3.0VNT 222K Miles. OM617.95, GT2256V VNT turbo, 4-speed manual, 3.46 diff, 15mm rear swaybar, ALDA removed, no EGR and Amsoil by-pass oil filter. Currently 107HP and 195lb/ft of torque at the wheels.
www.youtube.com/Turbo617
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RE: Dont know if i trust the mechanic???? - 12/6/2007 9:21:03 AM
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boblo_home
Posts: 30
Joined: 6/11/2007
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I don't trust any mechanics, period. I do my own maintanence on my 1983 300TD. My takes on the issues
1) Clean out the airfilter assembly and replace the air filter if it is clogged up bad. Then leave it alone until the next oil change. If the rings or piston is shot then you would see a lot of white smoke.
2) Glow plug light will fail to come on when 1 or 2 plugs are bad. This is a MBZ thing to indicate bad plugs. I normally unplug the socket from the glow plug relay assemby and ohm them our one by one. I think it is a 5 or 6 plugs connector with thick cables. Ohm them out to ground with a multi-meter. They should all measure < 2 ohms. Any one with high reading means bad glow plug.
3) Thermostat should be fine unless the engine overheat. If the temperature stays low then it is stuck open. 80C is fine for me.
As other have said, I would not go back to him. Ever again.
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RE: Dont know if i trust the mechanic???? - 12/6/2007 9:30:04 AM
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guage
Posts: 21
Joined: 1/5/2006
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Did you take out the 80a blade fuse to inspect it?
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RE: Dont know if i trust the mechanic???? - 12/6/2007 11:36:52 AM
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boblo_home
Posts: 30
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You did NOT need to take out any fuses. It should be the same in your car. You remove the connector from the glow plugs assembly to the relay circuit. It should be a 2" x 1" connector with very round thick legs. I cannot remember whether it is a female or male plug. Just follow the wires from the glow plug to the relay box.
After you remove it then measure the ohm from the connector pin to ground ( chassis ) and every wire should measure < 2 ohm. The plug provides the current to the glow plugs. You are measuring the resistance of each glow plugs, that is all. Good glow plug has very low resistance.
One thing I forgot is that some old MBZ glow plugs are arranged in series, i.e. they are chained together one by one. My car is a star type, each one is connected to the relay individually. That means you need to find out but it should be quite simple. I do not have access to my book now but I think if it is in series then 1 bad plug would make the car very difficult to start as no plug would come on.
Good luck.
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