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  #1  
Old 07-01-2011, 04:51 AM
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Is There Something Loose in my 300CD Engine Bay (plus some other queries)??

Hey guys,

Just picked up an '85 300CD. I was looking in the engine bay and noticed something strange just freely dangling. Any idea what it is?



Also, I was trying to do the ALDA cleaning, but I don't know which banjo bolt to remove since my connections look a little different than the one on DieselGiant.

Finally, I have the dreaded vacuum element problem. Air blows through the side and center vents fine, but continuously blows through defrost, and does not blow to the floor. Any suggestions on the best place to start would be helpful.

Thanks in advance!

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  #2  
Old 07-01-2011, 12:50 PM
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That may be the block heater cord.

Follow the pressure line from the switchover valve to the manifold.

85's are a bit different than what I'm used to.
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  #3  
Old 07-01-2011, 01:36 PM
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That is the block heater cord. Pressure line runs from banjo fitting on back of intake manifold to overboost protection solenoid on the firewall then down to the ALDA.

I have a thread from about 8 yrs ago on how to replace the footwell vacuum pod.


Damn, my memory's good It was 8 yrs ago:

footwell vent pod rebuild tricks?
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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Old 07-01-2011, 03:31 PM
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Quote:
Originally Posted by kerry View Post
...............Damn, my memory's good It was 8 yrs ago:....................
I've noticed that the jobs with higher frustration levels tend to stick in your mind.
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84 300SD 350K+ miles ( Blue Belle )
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  #5  
Old 07-01-2011, 05:21 PM
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Thanks for the help. Is the block heater cord supposed to be stationary somewhere? Is it currently inoperable? Know where it goes? Thanks!
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  #6  
Old 07-01-2011, 05:42 PM
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It should plug into the block heater itself, under the turbo.

In Cali, I wouldn't worry about it, unless you live in the mountains.
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Old 07-01-2011, 05:44 PM
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Given the vast distance between us, it's hard to tell if the cord is operable or not You'll need to plug it in to find out. Most people let it dangle out the front of the grille so it's accessible for an extension cord without opening the hood.
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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Old 07-01-2011, 05:56 PM
Yak Yak is offline
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Before plugging it in, check the condition of the heater itself and the cord on the other end. The heater's on the block up behind the alternator on the passenger side. The end you can see may look intact and pliable, the other end may be old and frayed after decades of exposure. A short circuit of 110 V AC is quite possible.

For vacuum diagrams, do a search for "definitive" by Yak. The diagrams for the '83 Fed coupe are all there, '85 and Cali may have some differences.
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Old 07-01-2011, 06:01 PM
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Quote:
Originally Posted by toomany MBZ View Post
It should plug into the block heater itself, under the turbo.

In Cali, I wouldn't worry about it, unless you live in the mountains.
Not the end in the photo. That end plugs into an extension cord.
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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Old 07-01-2011, 06:59 PM
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How do you have it dangle out the grill when you open and close the hood? Doesn't the cord get pinched somewhere?

Sixto
87 300D
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  #11  
Old 07-01-2011, 07:09 PM
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Mine's just to the side of the grille, fed out in the slot beside the radiator.
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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  #12  
Old 07-02-2011, 09:53 AM
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Quote:
Originally Posted by kerry View Post
Not the end in the photo. That end plugs into an extension cord.
I haven't seen an extension cord with that plug. At the front of the car tie wrapped to a cross member is a three pronged plug that does fit an extension cord. But I haven't seen a Cali plug.
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  #13  
Old 07-02-2011, 12:11 PM
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Quote:
Originally Posted by toomany MBZ View Post
I haven't seen an extension cord with that plug. At the front of the car tie wrapped to a cross member is a three pronged plug that does fit an extension cord. But I haven't seen a Cali plug.
There's a cover over the three prongs in the OP's photo. It keeps the prongs from being exposed to the elements all the time.
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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  #14  
Old 07-02-2011, 03:54 PM
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I see, thanks for the clarification.

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