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What is this part and why is it ticking? What is this part and why is it ticking?
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  #1  
Old 04-06-2011, 03:16 PM
Austin85's Avatar
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Location: Rio Ancho, Dibulla Colombia
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What is this part and why is it ticking?
1981 300SD

Please see attached pics. When I try starting the car it will not turn over at

all. This part ...makes fairly loud ticking noise instead.

Any advice what this is and what is issue?

Thanks.

Austin

Attached Thumbnails
What is this part and why is it ticking?-car-part-300sd-002.jpg   What is this part and why is it ticking?-car-part-300sd-001.jpg  
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'87 924S
'81 280SEL

Sold ->

81 300SD -
93 300E w/ 3.2
85 300D-
79 300SD
82 300CD
83 300CD - CA
87 190E 5 spd
87 Porsche 924S

"..I'll take a simple "C" to "G" and feel brand new about it..."

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  #2  
Old 04-06-2011, 03:21 PM
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Posts: 18,350
That's the glow plug relay. Sounds like yo uhave a bad battery or bad connections.
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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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  #3  
Old 04-06-2011, 03:21 PM
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Quote:
Originally Posted by Austin85 View Post
1981 300SD

Please see attached pics. When I try starting the car it will not turn over at

all. This part ...makes fairly loud ticking noise instead.

Any advice what this is and what is issue?

Thanks.

Austin
Glow plug relay
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  #4  
Old 04-06-2011, 03:27 PM
Austin85's Avatar
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Quote:
Originally Posted by kerry View Post
That's the glow plug relay. Sounds like yo uhave a bad battery or bad connections.
I believe I charged battery fully yesterday...any idea what shows up if I have a bad glow plug relay ?


......................
__________________
'87 924S
'81 280SEL

Sold ->

81 300SD -
93 300E w/ 3.2
85 300D-
79 300SD
82 300CD
83 300CD - CA
87 190E 5 spd
87 Porsche 924S

"..I'll take a simple "C" to "G" and feel brand new about it..."

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  #5  
Old 04-06-2011, 03:43 PM
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The relay has a strip fuse, remove and carefully inspect it for hairline cracks.

Measure voltage there too.
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  #6  
Old 04-06-2011, 03:59 PM
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The clicking is an effect, not a cause. It occurs when voltage is low. Could be a bad connection. Have you load tested the battery?
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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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  #7  
Old 04-06-2011, 04:08 PM
Austin85's Avatar
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Quote:
Originally Posted by kerry View Post
The clicking is an effect, not a cause. It occurs when voltage is low. Could be a bad connection. Have you load tested the battery?
Have not tested ..It is fairly new Interstate battery...

...
__________________
'87 924S
'81 280SEL

Sold ->

81 300SD -
93 300E w/ 3.2
85 300D-
79 300SD
82 300CD
83 300CD - CA
87 190E 5 spd
87 Porsche 924S

"..I'll take a simple "C" to "G" and feel brand new about it..."

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  #8  
Old 04-06-2011, 04:23 PM
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these might help.
Attached Files
File Type: pdf w126 checking preglow system p1 of 2.pdf (530.5 KB, 153 views)
File Type: pdf w126 checking preglow system p2 of 2.pdf (502.6 KB, 168 views)
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  #9  
Old 04-06-2011, 04:29 PM
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Quote:
Originally Posted by toomany MBZ View Post
The relay has a strip fuse, remove and carefully inspect it for hairline cracks.

Measure voltage there too.

Can you describe where the strip fuse is?

Thanks,...

........
__________________
'87 924S
'81 280SEL

Sold ->

81 300SD -
93 300E w/ 3.2
85 300D-
79 300SD
82 300CD
83 300CD - CA
87 190E 5 spd
87 Porsche 924S

"..I'll take a simple "C" to "G" and feel brand new about it..."

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  #10  
Old 04-06-2011, 04:36 PM
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OP mentions it won't turn over at all? I wouldn't be looking at that relay...
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  #11  
Old 04-06-2011, 04:36 PM
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Quote:
Originally Posted by Austin85 View Post
Can you describe where the strip fuse is?

Thanks,...

........
It's what's under the two gold colored screws at the left side of the box in your first picture at the start of this thread.
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~Michael S.~
Past cars:

1986 300SDL
1987 300SDL
1982 240D
1982 300SD


Current:

1987 300SDL
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  #12  
Old 04-06-2011, 04:37 PM
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I suggest taking a good close look at the battery terminals. Make sure they're clean, if not, take a wire battery brush to them. Make sure they're clamped down very tightly.
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~Michael S.~
Past cars:

1986 300SDL
1987 300SDL
1982 240D
1982 300SD


Current:

1987 300SDL
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  #13  
Old 04-06-2011, 04:39 PM
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Must add..not sure if there is any connection to relay issue ..

Last weekend noticed electrical issue . After a 1 hr highway drive At stoplight the Radio/tuner went on/off/on/off /etc .....This never happened before.


...
__________________
'87 924S
'81 280SEL

Sold ->

81 300SD -
93 300E w/ 3.2
85 300D-
79 300SD
82 300CD
83 300CD - CA
87 190E 5 spd
87 Porsche 924S

"..I'll take a simple "C" to "G" and feel brand new about it..."

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  #14  
Old 04-06-2011, 04:42 PM
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Quote:
Originally Posted by Austin85 View Post
Must add..not sure if there is any connection to relay issue ..

Last weekend noticed electrical issue . After a 1 hr highway drive At stoplight the Radio/tuner went on/off/on/off /etc .....This never happened before.


...
Unlikely connected to the relay, EXCEPT that both that, as well as the relay, are BOTH symptoms, in my opinion, of a "larger problem". They're both effects and neither is the cause. This has every sign of being a battery that can't support the electrical system, your protests about recent charging and battery newness notwithstanding. Might be a bad battery, might be a bad battery connection, and might even, I suppose, be a starter that has failed and is drawing an extreme amount of current. Maybe a failed alternator.... I'm just shotgunning at the moment but I think it's very likely to be an overall "not enough battery current" problem. Whatever the cause is.

Put a volt meter on the battery just as it sits out there and tell us what it reads. Then try to crank the car a time or two and read the voltage while you're attempting to crank.
__________________


~Michael S.~
Past cars:

1986 300SDL
1987 300SDL
1982 240D
1982 300SD


Current:

1987 300SDL
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  #15  
Old 04-06-2011, 04:48 PM
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Quote:
Originally Posted by MattBelliveau View Post
OP mentions it won't turn over at all? I wouldn't be looking at that relay...
x25

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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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