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  #1  
Old 10-05-2008, 07:34 PM
79Mercy's Avatar
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Front end knock/pop??

I have a knock/pop on the drivers side fron of my car when I start the car, turn(sometimes), apply brakes. It isn't motor mounts because it idles smooth. Any ideas as to what it could be? Thanks
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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

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  #2  
Old 10-05-2008, 08:01 PM
sixto's Avatar
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Guide rod mount. One end, likely the aft end, of the strut that runs between the lower control arm and the firewall.

Sixto
87 300D
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  #3  
Old 10-05-2008, 08:03 PM
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How can I check it? Does it need to be replaced right now or can it wait for awhile?
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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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  #4  
Old 10-05-2008, 08:14 PM
sixto's Avatar
smoke gets in your eyes
 
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It takes the weight of the car to feel the looseness so pretty hard to do without taking the suspension apart but those sypmtoms are classic.

Should be a while before anything catastrophic happens

Sixto
87 300D
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  #5  
Old 10-05-2008, 08:17 PM
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whats the worst that could happen?

Do I have to remove the springs to replace the rod and bushings?
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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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  #6  
Old 10-05-2008, 08:53 PM
sixto's Avatar
smoke gets in your eyes
 
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The guide rod can come loose and you'll lose caster placement of the wheel and steering ability. I've never heard of a guide rod mount failing catastrophically. In the infrequent case there is a catastrophic failure, it's caused by rust, not a worn bushing.

No need to remove the spring if you're not going to replace the forward bushings. You need a come-along to pull the lower control arm forward enough to remove and replace the guide rod mount.

Sixto
87 300D
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  #7  
Old 10-05-2008, 08:59 PM
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okay, how can I tell when it really need to be repaired? When it starts popping alot?

Thanks for the help.
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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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  #8  
Old 10-05-2008, 09:47 PM
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Could it be a shock?
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  #9  
Old 10-05-2008, 09:54 PM
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You can pry on the lower control arm and you will see movement in that guide rod bushing if its bad- also check under the rubber cover and look at the boot- if its torn apart, then yeah thats probably the source of your noise
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  #10  
Old 10-05-2008, 10:13 PM
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I'll take a look next weekend when I have someextra time. About how long will it be before I have to replace it?
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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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  #11  
Old 10-06-2008, 12:42 AM
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I had a loose motor mount (bolt was cross threaded, wouldn't go in all the way and the head stripped, so I said screw it) on my passenger side. Made a horrible knocking noise when Id hit bumps, start the car, and shut it off. Finaly fixed that..

could it be a ball joint? Maybe the rocking of the engine on startup causes it to make the noise also
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  #12  
Old 10-06-2008, 05:47 AM
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I would double check the motor mount. Especially the contact area where the arm meets the mount. Also check the center bolt that goes into the arm, sometimes as stated above the threads get screwed up or the bolt is loose.
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  #13  
Old 10-06-2008, 09:02 AM
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i'll take a look. Also, I can feel the pop in the floor when it happens.
__________________
1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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  #14  
Old 10-06-2008, 09:23 AM
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You can check the guide rod mount by jacking it up and prying on the lug that is near that end with a crow bar or similar device. Ther should be little or no movement.
You don't need a come along to replace it. This is a 1 hr job if things come apart w/o too much trouble. You need to be carefull about adjusting the length back to where it was or you will need to get an alignment.
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  #15  
Old 10-06-2008, 09:33 AM
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is there any type of DIY write up around here on guide rod mounts?
__________________
1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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