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#1
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Another weird noise in my 300SDL
I dunno, hate to seem paranoid but this is funny and not funny ha-ha. Almost sounds like a playing card in bicycle spokes.
https://youtu.be/Wte_EDFQgWE I found this one from about a year ago to compare: http://youtu.be/c21_xj4mesc *ETA* I'm wracking my brain to try to figure what, if anything, I might have lapsed on. I checked the oil when I first heard this sound, it was maybe 1/8 inch about the min, I'm about to change it. More important, I may have gotten slack a time or two about putting in enough lubricity additive. I'm running on HPR, the 2nd gen biodiesel that CA brings in, I gather one should use the lubricity additive. I've been using Howes Diesel Treat, one ounce to 5 gallons, usually more than that. Maybe I'm tripping here, dunno. I'll put some extra in before I go anywhere, though I suspect if any damage has been done that horse has left the barn. I've seen no driveability issues in the last few days, power is good. Another odd bit, from the two vids it seems like the idle speed is higher now. My tach says about 700.
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Te futueo et caballum tuum 1986 300SDL, 362K 1984 300D, 138K Last edited by cmac2012; 10-16-2018 at 06:27 AM. |
#2
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Tensioner shock or tensioner pulley worn out. They make that high frequency "chatter" when they crap themselves.
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Current stable: 1995 E320 157K (Nancy) 1983 500SL 125K (SLoL) Gone but not forgotten: 1986 300SDL (RIP) 1991 350SD 1991 560SEL 1990 560SEL 1986 500SEL Euro (Rusted to nothing at 47K!) Gone and wanting to forget: 1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz] |
#3
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You mean this guy?
![]() And this is the shock, I think: ![]() The dealer has the shock on the shelf - $93. Pelican aftermarket - $31. I was hoping to make a trip this weekend, might not work.
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Te futueo et caballum tuum 1986 300SDL, 362K 1984 300D, 138K |
#4
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Quote:
Seems to me that a bad bearing in the pulley would be the source of the noise but you have more experience in this issue than I do, that much is clear. Looks like I’ll need to take the radiator out to do this job. Once I get the parts.
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Te futueo et caballum tuum 1986 300SDL, 362K 1984 300D, 138K |
#5
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Might as well replace the spring and pulley also - my spring broke about 5k miles after I replaced just the lever. Parts from Pelican, that was about 10-15k miles ago - so far so good.
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1992 300SD 140.134 Sold |
#6
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Yeah, I’m thinking to replace it all. Hard to get in there, may as well do it right. I found a place here locally, not your normal chain auto parts store - Kohlweiss. They can get me the parts this afternoon, after market, but I think I’ll go that route here.
What I can’t figure, it looks like there are two shocks going on but he says only one is required. I’ll look closely when I get back.
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Te futueo et caballum tuum 1986 300SDL, 362K 1984 300D, 138K |
#7
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Quote:
Replace the shock and the spring as a pair. If the tensioner pivot needs replaced, you can do it without removing anything from the engine. It gets TIGHT against the fan, but you can do it. If the pulley on the tensioner needs replaced, now is the time. Usually the tensioner parts are ok, it's just that shock that wears out and causes a heck of a racket. As mentioned above, the spring usually fails soon afterwards from stress, so it's a good idea to replace it preemptively.
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Current stable: 1995 E320 157K (Nancy) 1983 500SL 125K (SLoL) Gone but not forgotten: 1986 300SDL (RIP) 1991 350SD 1991 560SEL 1990 560SEL 1986 500SEL Euro (Rusted to nothing at 47K!) Gone and wanting to forget: 1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz] |
#8
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You’ll need a 12mm hex bit for the tensioner arm bolt.
Sixto 98 E320s sedan and wagon 02 C320 wagon |
#9
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Quote:
I wanted to change coolant today, taking the radiator out wouldn't be a huge problem. But I'll look it over.
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Te futueo et caballum tuum 1986 300SDL, 362K 1984 300D, 138K |
#10
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The torque spec for the tensioner arm bolt is 50- or even 70 lbft so you need a socket rather than a key. Go easy on that bolt. MB added internal ribs in each of a handful of front cover redesigns.
Sixto 98 E320s sedan and wagon 02 C320 wagon |
#11
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This must be the spring, eh?:
![]() (I'm not Canadian, 'say what?' seemed a bit much)
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Te futueo et caballum tuum 1986 300SDL, 362K 1984 300D, 138K |
#12
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The shock is an easy replacement. My existing shock had full resistance one way, but no practical resistance the other. The bushings that the bolts go through we’re stuck in tight, but spun almost as easily as if there were bearings. The new one had fully tight bushings.
It made a marked, substantial difference in noise and smoothness.
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Current Diesels: 1981 240D (73K) 1982 300CD (169k) 1985 190D (169k) 1991 350SD (116k) 1991 350SD (206k) 1991 300D (228k) 1996 Dodge Ram CTD (442k) 1996 Dodge Ram CTD (267k) Past Diesels: 1983 300D (228K), 1985 300D (233K), 1993 300D 2.5T (338k), 1993 300SD (291k) |
#13
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That is the "Belt Tensioner Lever for Tensioner Pulley". The belt tensioner spring connects to driver side of that lever and the belt tensioner shock connects to the other side.
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1992 300SD 140.134 Sold |
#14
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This was a challenge. I undid the top bolt on the shock absorber but on the bottom, I got it unscrewed, tried to slide it forward, no can do. Will not come out, the pulley stops it. Nor can I pull the piece upward, the bolt is still inside it somewhat.
One option is to take the water pump pulley off but to do that I first need to take the fan clutch off. If it was my BMW E30 would have been off 15 minutes ago. It takes an 8mm allen socket just fine but which way to turn it is the question. Neither way wants to break free. My bimmer has reverse threads on the fan clutch, that way you don't even need to tighten it seriously as the clockwise direction of the motor will act to keep it snug. I sorta hate to bang it with hammer to break it free if I'm going the wrong way. I was in trouble with the bolt on the bottom of the shock, couldn't screw it back in so I cut it off, easy enough to get another. While putting it together I'll practice with a doable method to swap the shock w/o pulling the radiator and fan. I read that the shock can have short lifetime. I get the rest of the parts in the morning, was just prepping. I'm glad I got a new Belt Tensioner Lever. The old one has some slop in the movement.
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Te futueo et caballum tuum 1986 300SDL, 362K 1984 300D, 138K Last edited by cmac2012; 10-17-2018 at 05:16 AM. |
#15
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Put an OAP pulley on the alternator and never have to worry about the tensioner again.
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