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#1
10-05-2008, 06:34 PM
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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
__________________
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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#3
10-05-2008, 07:03 PM
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How can I check it? Does it need to be replaced right now or can it wait for awhile?
__________________
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
10-05-2008, 07:14 PM
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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
10-05-2008, 07:17 PM
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whats the worst that could happen?
Do I have to remove the springs to replace the rod and bushings?
__________________
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
10-05-2008, 07:53 PM
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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
10-05-2008, 07:59 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.
__________________
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
10-05-2008, 08:47 PM
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Could it be a shock?
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#9
10-05-2008, 08:54 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
__________________
 1980 500SE/AMG Euro 1981 500SEL Euro 1982 380SEL 1983 300TD 1983 500SEC/AMG Euro 1984 500SEC 1984 300TD Euro 1986 190E 2.3-16 1986 190E 2.3 1987 300D 1997 C36 AMG 2003 C320T 4matic past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350
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#10
10-05-2008, 09:13 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?
__________________
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
10-05-2008, 11:42 PM
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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
__________________
 1981 300SD 512k OM603
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#12
10-06-2008, 04:47 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.
__________________
1983 123.133 California - GreaseCar Veg System 
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#13
10-06-2008, 08:02 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
10-06-2008, 08:23 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.
__________________
81 300D Turbo 190K sold 83 300sd 319K best $500 I ever spent-daily driverw/ 2 tank WVO set up
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#15
10-06-2008, 08:33 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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