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  #1  
Old 12-08-2008, 09:12 AM
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Loud thunk when starting

Lately, Max, my 300TD, has had a loud thunk when starting up. That's the only thing out of the ordinary I am hearing. Any suggestions about what to look for first?
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  #2  
Old 12-08-2008, 10:32 AM
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Where's the noise coming from? Loose starter? Broken motor mount?
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  #3  
Old 12-08-2008, 10:37 AM
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I don't think it's the starter and the motor mounts seem to be fine, too. I am guessing that it's something loose, though. It sounds like it's coming from somewhere around the rear of the motor or the trans. It "thunks" one time and then there's no other unusual noise after that.
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1998 Lincoln Continental - Sold
Max 1984 300TD 285,000 miles - Sold
The Dee8gonator 1987 560SEC 196,000 miles - Sold
Orgasmatron - 2006 CLS500 25,000 miles
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  #4  
Old 12-08-2008, 10:38 AM
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Does it sound like a resonator hitting the chasis frame?
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  #5  
Old 12-08-2008, 10:40 AM
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If the trans mount is beat, would it allow the starter to lift it?
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  #6  
Old 12-08-2008, 11:32 AM
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Quote:
Originally Posted by Chad300tdt View Post
If the trans mount is beat, would it allow the starter to lift it?
That's what I'm thinking too.
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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 12-08-2008, 11:34 AM
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I'll crawl under there and check it out when I have a chance. thanks for the suggestion.
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1998 Lincoln Continental - Sold
Max 1984 300TD 285,000 miles - Sold
The Dee8gonator 1987 560SEC 196,000 miles - Sold
Orgasmatron - 2006 CLS500 25,000 miles
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  #8  
Old 12-08-2008, 11:45 AM
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Tom,

Talk to John about the flex plate breaking on Bruno. It could be happening to you.
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  #9  
Old 12-08-2008, 11:47 AM
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That's a good thought. I just replaced the front one on the SEC, but haven't checked the one on Max yet.
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OBK #55

1998 Lincoln Continental - Sold
Max 1984 300TD 285,000 miles - Sold
The Dee8gonator 1987 560SEC 196,000 miles - Sold
Orgasmatron - 2006 CLS500 25,000 miles
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  #10  
Old 12-08-2008, 11:48 AM
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Quote:
Originally Posted by LUVMBDiesels View Post
Tom,

Talk to John about the flex plate breaking on Bruno. It could be happening to you.
Interesting ... Didn't you say you replaced the front disc Tom? Maybe something is loose.

EDIT: I see your answer. I was busy typing.
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1985 300CD - "Gladys" - 255,XXX miles - FOR SALE
2005 Dodge Magnum 3.5 SXT AWD
1998 Acura 3.0 CL
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1986 300SDL - Coda
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  #11  
Old 12-08-2008, 11:49 AM
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Quote:
Originally Posted by TX76513 View Post
Does it sound like a resonator hitting the chasis frame?
That would be at the rear of the car, wouldn't it? I don't think it's that. This is a more solid thunk than I think a resonator would make.
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OBK #55

1998 Lincoln Continental - Sold
Max 1984 300TD 285,000 miles - Sold
The Dee8gonator 1987 560SEC 196,000 miles - Sold
Orgasmatron - 2006 CLS500 25,000 miles
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  #12  
Old 12-08-2008, 11:59 AM
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Quote:
Originally Posted by Dee8go View Post
That would be at the rear of the car, wouldn't it? I don't think it's that. This is a more solid thunk than I think a resonator would make.
I won't use the word resonator -How about center muffler You didn't state where the noise was originating, and it's not always easy to determine. These cars can be full of creepy intermittent noises. My SDL has a faint chime (one time) that will occasionally sound off after ignition. Have never found the source and have since dismissed it as some sort of personal W126 hearing disorder that I have contracted.
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  #13  
Old 12-08-2008, 12:06 PM
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I was making the assumption that the 300TD's resonators would be at the rear of the car like the ones (that used to be) on my SEC. The flex plate and trans mount suggestions sound like likely possibilities. I'll start there.
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OBK #55

1998 Lincoln Continental - Sold
Max 1984 300TD 285,000 miles - Sold
The Dee8gonator 1987 560SEC 196,000 miles - Sold
Orgasmatron - 2006 CLS500 25,000 miles
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  #14  
Old 12-08-2008, 12:12 PM
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Flex plate isn't the same as flex disc. I don't think there are two flex plates, so 'front one' doesn't make any sense to me.
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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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  #15  
Old 12-08-2008, 12:15 PM
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Quote:
Originally Posted by kerry View Post
Flex plate isn't the same as flex disc. I don't think there are two flex plates, so 'front one' doesn't make any sense to me.
Sorry, I read it as flex disc.

Here's a thread with pics of a bad flex "plate"
Pics of a Cracked Flex Plate
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10th Annual Southeast PA Benzfest start at post #1472

Chad
1985 300CD - "Gladys" - 255,XXX miles - FOR SALE
2005 Dodge Magnum 3.5 SXT AWD
1998 Acura 3.0 CL
OBK#44
"Pleasure in the job puts perfection in the work." - Aristotle (384-322 B.C.)

SOLD
1985 300TD - Red Dragon
1986 300SDL - Coda
1991 - 300TE
1995 - E320
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