|
|
|
#1
|
||||
|
||||
'99 E300-Cold Start Metallic Noise
Hey guys,
My E300 is running beautifully, but on cold starts I experience a metallic rattling/clicking noise for about seven seconds upon startup. Comes from the very front of the engine....I'm 98% sure it's the chain tensioner. Is this the correct guess? On the same note (although I believe unrelated), when idling hot it emits a slight random clicking, can't pinpoint its exact location. I've heard of gasser engines (119s mainly) having broken plastic cam oilers, do these 606s have them as well?
__________________
99 E300 TD -- sold 01 540i 6 spd |
#2
|
|||
|
|||
Did you do your delivery valve seals too while you had your IM off last week? Could be some minor nailing.
Also check the tensioner pivot arm. It has a metal sleeve that rides on a steel pin. You can drop the belt and run a COLD engine for 30 secs to confirm that.
__________________
Terry Allison N. Calif. & Boca Chica, Panama 09' E320 Bluetec 77k (USA) 09' Hyundai Santa Fe Diesel 48k (S.A.) |
#3
|
|||
|
|||
Are you sure it's not a combustion knock? Especially if you have one bad glow plug, you'd get a lot of knocking after a cold start. Never assume your glow plugs are fine just because they're new. The only way to tell is to do a cold/hot resistance test.
__________________
2004 VW Jetta TDI (manual) Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL |
#4
|
|||
|
|||
I believe the cars with the serpentine belt, and its tensioner, are susceptible to this noise when the tensioner wears out. Check the threads on engine mount replacements of late, there is a link between the condition of the mounts and the life of the critical tensioner parts described that was news to me.
I would guess you have pointed to the right component, but you should make sure you look to see if the mounts are shot too, otherwise it looks like it is possible for the tensioner to have an unsatisfactorily short life. Good luck, Jim
__________________
Own: 1986 Euro 190E 2.3-16 (291,000 miles), 1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000, 1988 300E 5-speed 252,000 miles, 1983 240D 4-speed, purchased w/136,000, now with 222,000 miles. 2009 ML320CDI Bluetec, 89,000 miles Owned: 1971 220D (250,000 miles plus, sold to father-in-law), 1975 240D (245,000 miles - died of body rot), 1991 350SD (176,560 miles, weakest Benz I have owned), 1999 C230 Sport (45,400 miles), 1982 240D (321,000 miles, put to sleep) |
#5
|
|||
|
|||
One bad glow plug will trigger the glowplug/check engine light. If mounts are original, it's time.
Len |
#6
|
|||
|
|||
My 99 e300 has done this since I've owned it. (67k) I assumed that it was an intended function of a cold start.
__________________
85 300sd 400k 99 e300td 101k (hers) 34' californian twin 5.9 cummins 1999 F350 Powerjoke 75k 2001 F150 Supercrew 51k 19681/2 GT/CS |
#7
|
||||
|
||||
I get the same noise you are describing. Mine comes from the belt idler pulley dampner. To test I just put my finger on the dampner where it bolts to the block (sound stops). Finger off (sound is back). Might be like most people here are saying and your belt tentioner (idler) is wearing out.
|
#8
|
||||
|
||||
Thanks guys, it's definately not nailing, is a difinitive clicking that can be heard above startup knock, and it only happens during the first several seconds upon start-up. This is the noise I belive to be caused by the chain tensioner. I did not change my delivery valve seals last week but they are only a year old. I also have one bad GP still in there and the CEL/GP light is not abnormally triggered. I can try to make a recording of the sound this morning because the car is cold right now.
The second noise I am experiencing (random ticking on hot idle) may be caused by the belt tensioner. I'll try putting my finger on the damper when it's making the sound and see if it changes; I agree though, I probably need to look at the motor mounts.
__________________
99 E300 TD -- sold 01 540i 6 spd |
#9
|
||||
|
||||
Don't put your finger on it, if you value your skin. It will be red hot.
Use a screwdriver. |
#10
|
|||
|
|||
Hi
Is it not just the hydraulic tappets filling up with oil pressure? Mine does it and i think its normal first 2-3 secs McCool300TD
__________________
1988 190E Sold 1996 C230K Sport Sold His: 98 E300TD Estate, 7 seater, Avantgarde, Silver, Black cloth, parameter steering, dipping rvm, folding mirrors, rain sensing wipers, pentagon tints, 17" Elegance wheels. 298K Hers: 93 300TD, 7 seater, Grey MB Tex pearl blue metallic, 15" 8 hole alloys, OTG, Cruise, not much else 220K |
Bookmarks |
Thread Tools | |
Display Modes | |
|
|