i posted this in the OT but only got one response so i am going to try it in it's own thread.

my engine that was just installed seems a but loud to me. here are some videos with sound to see if there is any help.

http://www.youtube.com/watch?v=a5vTce0JnrU

http://www.youtube.com/watch?v=Pog9AnL17Ho

thanks in advance

__________________
-Trevor

OBK #12
1980 300SD 333,XXX miles - Totaled
1986 Mazda RX-7 212,XXX miles - impounded and auctioned off
2005 Jeep Liberty CRD Limited 33,000- SEGR, Provent, Fumoto

Doesn't sound like an injector knock, but, just to be sure...........crack each injector line fitting...........one at a time...........while the engine is running.

See what happens when you find the cylinder with the problem. It might completely disappear...........or partially disappear.

Report back.

just did that after i posted. the number 3 cyl i think is the culprit. i cracked it the idle smoothed out and the noise went away.

__________________
-Trevor

OBK #12
1980 300SD 333,XXX miles - Totaled
1986 Mazda RX-7 212,XXX miles - impounded and auctioned off
2005 Jeep Liberty CRD Limited 33,000- SEGR, Provent, Fumoto

Ok, now just for an experiment, switch injector #2 with #3. See what you get.

Also, with #3 removed, take a strong light and peer down into the PC and see if the shaft and distribution ball is intact. Remove the heat shield at the bottom............naturally.

cracked the lines. #3 cyl pretty much eliminates the noise. oddly enough, these are the injectors from the old engine. swapped cyl for cyl, the #3 on that one is kinda dry and rusty in side the hole, where the others were nice and wet.

i didn't know if the newer injectors were good. One of them did not have the little diffuser thingy in the top so i swapped them all. i didn't know if they were different pop pressures or not.

could i just swap one of thoes out?

__________________
-Trevor

OBK #12
1980 300SD 333,XXX miles - Totaled
1986 Mazda RX-7 212,XXX miles - impounded and auctioned off
2005 Jeep Liberty CRD Limited 33,000- SEGR, Provent, Fumoto

Since you have provided no background regarding "old engine" or "new engine", and I'm not clairvoyant, I cannot advise you as to what to swap.

However, it was my intention to change the #3 injector and see if the sound changes.

i have 10 injectors total.

you want me to see if the sound moves with the injector. i'll just swap 2 that are on the engine.

__________________
-Trevor

OBK #12
1980 300SD 333,XXX miles - Totaled
1986 Mazda RX-7 212,XXX miles - impounded and auctioned off
2005 Jeep Liberty CRD Limited 33,000- SEGR, Provent, Fumoto

That is what Brian was getting at in post #4...

__________________
Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John

When you say "crack each injector", do you mean to loosen the connection fitting? Something else? Does this cause a fuel leak?

yes lossening the injector line on that cylinder to stop getting fuel pressure to the injector. meaning not enough pressure to pop the injector. no fuel in the combustion chamber.

__________________
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.

i figured that but i thought it would have been easier just to replace the injector.... then i thought again and i would not have known if it was the injector.

you crack the hardline on top of the injector, yes some fuel comes out and sometimes it squirts.

__________________
-Trevor

OBK #12
1980 300SD 333,XXX miles - Totaled
1986 Mazda RX-7 212,XXX miles - impounded and auctioned off
2005 Jeep Liberty CRD Limited 33,000- SEGR, Provent, Fumoto

Gents,

I hope I am not piggybacking here, but my odd engine noise only happens when I start it up in the morning or afternoon for the first time. It is a fairly loud clacking that goes away after the engine warms up. I am the new owner of the car. The previous owner used B100 almost exclusively, and regularly added ATF to the gas, and also used Castrol 20W50. Here in Tucson, BioDiesel is hard to find, so I have been using #2 Diesel. The oil is changed regularly and religiously; I am adding Stanadyne "lubricity formula" to the gas, 4 oz at each fill-up.

I had the valves adjusted at a local European car repair shop that has experienced MB techs. The noise stopped for 48 hours and then returned.

If I pop the hood and grab the throttle linkage and take the engine up to 2k rpm, the noise is also there. However, when I am driving around the city, 40 mph in fourth gear runs around 2000 rpm, but with no noise.

Last week, 100 miles ago, following a suggestion from the previous owner, I added some Diesel Purge to the gas. Noise is still present.

I'll keep in touch here, looking for insights and clues. Great forum, Thanks!!

- Stu

__________________
Oro Valley Dude
1981 300 SD 340,000 mi - 617.951 with 120,000

not piggybacking at all. i am still at a loss with my noise.

Watch your oil pressure, does the sound stop when the car is warmed up or when the oil pressure rises.

another possibility... watch your exhaust for a bit. if you are seeing blackish smoke (possibly white on start up) after you see oil pressure you might have a cyl that is not firing till it is warmed up. this could be due to a bad glowplug or a cyl that has low compression.

__________________
-Trevor

OBK #12
1980 300SD 333,XXX miles - Totaled
1986 Mazda RX-7 212,XXX miles - impounded and auctioned off
2005 Jeep Liberty CRD Limited 33,000- SEGR, Provent, Fumoto

An update on my pilgrimage to fix the noise in my 1981 300 SD:

I did four tanks of gas adding the Stanadyne, the sound persisted, but only in the morning before it warmed up, or as it got cooler here in Tucson, after it had been sitting for a while.

After many long talks with my brother about oil and gas. We decided to try a tank full of diesel with MMO added. I had also finally seen how much black smoke comes out the butt of the car when I romp on it in second gear. My brother suspected that was dirty injectors that the MMO would help.

Well....after 200 miles on that tank of gas, the noise is worse. I have been checking the oil religiously, after the engine is warm, and I am not burning any oil.

So...my plan is to back to the Stanadyne, and see how the next oil changes deals with this. My plan is to use up the half-case of Castrol 20W-50, and then decide about some Rotella after that.

I am wondering about the previous owner's long term use of ATF added to each tank of Bio-diesel, but there is lots of bad ju-ju traffic about adding ATF to diesel fuel; so I am not certain about that...It looks like adding ATF to newer diesels is bad, but adding to older ones is okay. Any ideas on that?

This a bit of a pain, as I want to keep this little baby; but it is fun.

Stu

__________________
Oro Valley Dude
1981 300 SD 340,000 mi - 617.951 with 120,000

That 20w-50, is it a diesel rated oil? The Rotella 15w-40 is.

__________________
RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K

90 Dodge D250 5.9 Cummins/5 speed. 400K