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#1
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What is a tick, tick, tick sound when idling?
On my car, maybe just since it's gotten colder now, I hear a methodical
tick tick tick sound when the car is idling. I wonder if it's stuck valve lifters or something? I've heard this on many MB diesels, so I'm sure it's nothing serious. Thanks, Jeff 1991 300d, 112k |
#2
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You have a OM602? Sounds like bad lifters. Click..click...click..etc.
Is the sound persistent or does it go away as the engine warms up? |
#3
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Probably lifters. pretty common with the OM60X engines. Are you running synthetic oil?
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Current: 05 E320 CDI 07 GL320 CDI 08 Sprinter 05 Dodge Cummins 01 Dodge Cummins Previous 2004 E55 AMG 2002 C32 AMG (#2) 1995 E300 1978 300D 1987 300D 2002 C32 AMG(blown motor :[ 1981 300SD 1983 300SD 1987 300SDL 2002 Jetta TDI 1996 S420 1995 S500 1993 190E 2.6 1992 190E 2.3 1985 190E 2.3 5-Speed |
#4
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Most common source of engine noise on the OM60x engines (with single serp. belt) is the belt tensioner. At idle, push on the mechanism with a stick (be VERY CAREFUL - moving parts + wrong move = damage to humans and/or car). If you can make the noise change in anyway, it's time to rebuild the belt tensioner. Usually a new damper is all that is needed, but if the pulley wheel is not exactly in the same plane as the rest of the belt wheels, then you'll need to replace more parts.
After that, lifter noise is also very common and using a good synthetic oil like Mobil1 can cure it (but it sometimes takes thousands of miles of use before it is effective).
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Respectfully, /s/ M. Dillon '87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted '95 124.131 (E300) "Sapphire", 380k miles '73 Balboa 20 "Sanctification" Charleston SC |
#5
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Answers to some questions...
As to the clicking, it does seem to go away after the engine warms up. Today I was inbetween 2 cars, and I heard it. But I know for a fact once it's warmed up, it's a lot less, or completely gone.
The oil I use is Rotella with soot control. How would you fix a lifter? And what do they do? Like one person said, change oil and a few thousand miles later it could make a difference. I change the oil every 30,000 miles. Just joking, every 4-5k. Don't know about the previous owner, I bought the car with 89k on it. Jeff 1991 300d, 112k |
#6
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I notice mine does it loudly after a period of hard use. I notice it after everytime I run autocross with it, after awhile it goes away.
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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 |
#7
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Quote:
There are other things that could make a ticking sound, but the lifters have a pretty distinct noise. If it isn't a nailing sound, and it's coming from the top of the engine (i.e., not somewhere on the belt drive), it's probably lifters. I think of them as having more of a "ping" sound than the noises other problems might make.
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1987 300D, arctic white/palomino--314,000 miles 1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles 2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles 2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles 1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles 1995 S320, black/parchment--34,000 miles (Dad's car) |
#8
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How hard to replace the lifters?
Quote:
I can live without replacing them, but man, I sure wish these diesels would be more quiet at idle and low accelerations. How hard to replace the lifters? Jeff |
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