Hi,

I've just noticed a squeeking sound that occurs around 1600 rpm - usually not on acceleration, but when there is no load on engine following acceleration. I'm pretty sure it's not the turbo, and doesn't seem to be the brakes either. The sound seems to be coming from the front - could it be the wheel bearings? If so, would it be odd for them to make noise within such a tight RPM range?

I'm not even sure this is something serious, but thought I'd throw it out to the more knowledgeable...which seems to be most everyone who posts...

Thanks,

Joel

__________________
Joel
1985 300td (sold)
1981 280SEL (4-speed)

I know that some interior panneling on my car seem only to squeak at a certain rpm, perhaps it your dash? Anyway, if it's only at one rpm speed, then don't worry. The vibrations from your engine at a certian speed approach the resonance frequency of something loose in your engine compartment (like how a bell or a tuning fork works) and excite it. If it doesn't happen always (I mean at any given rpm), then it's problally not serious. Differential equations, my friends...

ATLD

Check your three rubber mounting points for the air cleaner. One of them may be broken in half.

__________________
Orland Park, IL
1985 300SD 215,000 miles

Any other ideas on squeaks. I think mine is higher than 1600. When it happens its about 5 per second. Maybe more around 3k rpm as well. I think its in the engine, though I can hear it better in the cab with less engine noise. Happens parked or on the road. Always same rpm.
Maybe theres a mouse stuck somewhere in there.
I did check this forum
Motor Problem - a new "squeal" but no answers yet.

__________________
1980 300td (non turbo)225,000
1982 yamaha xs650,
I've also once loved
79 Bmw 530i, 69 VW buss, 78 Honda Acc, 79 Jeep wagoneer, 76 Peugeot 504, 82 fiat spider 124,
a bunch of guitars and a banjo www.virb.com/sethlael

Ditto on the resonance theory - I have a terrible rattle I hear (seems to rattle at about 10 Hz) that I only hear at 950 +/- rpm. I finally figured out that it is one of my air cleaner mounts - the nut is missing on one of the corners and the rattle of the bolt in the mounting hole is surprisingly loud.

__________________
1984 300D Turbo, 326000 Km, Thistle Green Metallic

The Air Filter housing looks like a Violin or Guitar sound box. What a great way to amplify such a sound.....

Just an observation.

When I got the car I found that the air box leaks blow oil onto the egr onto the engine mount, on to the ground. So I took it off, cleaned the egr and everywhere else I saw oil. The mounts looked good and I even putt a little silicone on the washers of the screws yesterday to keep the oil in the air box. (clean the oil out once a week is a new ritual of mine instead off the ground)
Still squeaks. Maybe I'll Take the box off rev it ,and see if it still squeaks.
I do like the violin.

__________________
1980 300td (non turbo)225,000
1982 yamaha xs650,
I've also once loved
79 Bmw 530i, 69 VW buss, 78 Honda Acc, 79 Jeep wagoneer, 76 Peugeot 504, 82 fiat spider 124,
a bunch of guitars and a banjo www.virb.com/sethlael

If the squeak goes away with higher revs, you might check your belts. Mine did that and just needed a bit of tightening.

Hey! Thats what I was going to suggest. Check your belts.

__________________

I had the same squeak/shrieking noise on my '85 300D. Do a search on all my posts. I had the shrieking noise right after the trans shifted and load was off the engine. After posting and reading everything I could, I assumed this must be coming from the ARV (air recirculation valve on the turbo), or the EGR valve. By "accident" a 2.5MM BB (bought at the sports store) fell into the vacuum line to the EGR and the ARV, and wouldn't you know, the noise was gone. I hope this helps.

__________________
'85 300D 190K miles
running on B100 Biodiesel since 156K, SCRATCH THAT! I can only find Biodiesel at 1 location in Houston! (not very convenient)

kind of like how my torch just so happened to ignite and cut off my egr on my exhaust manifold? so i had to weld up a plate to block off the hole couldnt just leave that open like that...

__________________
Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac?

As long as they would add one additional commandment for you to keep thy religion to thyself.
George Carlin (Wonder where he is now..)

1981 240d (engine donor 1983 240d) recently rebuilt engine hurray! - No more.. fought a tree and the tree won.

pearl black 1983 240d 4speed (Converted!@$$%) atleast the tranny was rebuilt.