300Tdi Ringing Bell Knock Noise

Does this "knock" sound familiar to anyone? I've had a hard time getting anyone to even hear it, but I hear it clearly, and finally caught it on video. It is only at idle to about 1100 rpm. It seems to be coming from the #1 piston area, or water pump area. But when you use a stethoscope, the sound you get is much more like a loud tick. When this is happening in the garage, it is so loud you have to use hearing protection to be near the truck when at idle.
Engine "seems" fine otherwise, but I'm so nervous about this that I can't enjoy the truck, or do any more work on it till I figure out this problem. I've had lots of help from locals, but I would love to get a broader audience to have a listen.

[@rvrnnr987]

All good comments. I ended up selling this vehicle not long after the video was taken. No issues were ever found, although I do think the engine is simply old and could use a refurb. It always ran well, but I never did get it to pull as much as I think it should have. Also, I was a long way from really figuring out the HVAC system on this vehicle, and probably would have needed to do some more work to be satisfied. In the end, I owned my dream car! I built it with a budget to what I figured I could realistically do, and when I sold it, I was really happy to see it going to a family that will have some adventures in it. I'm sure I'll see it around someday, since it is only an hour or so away.

[@chrismiller9740]

Next to valve cover, a steel oil return line runs , on turbo side. This is often loose and makes same sound, caused by obvious vibration. Take some rubber tape and make a spacer to fit between valve cover and this oil line. Common issue but will cause no damage, just annoying.

[@chrismiller9740]

Sometimes injector can cause knocking if spray pattern off. Blocked nozzle

[@morimus]

Mine has a similar tickling noise. Replaced vacuum pump with a new one (Wabco Made in France), the tick tick is still there. I've read somewhere about conrods problems! Hope it's not my case!!!!

[@nigelhumphreysfsuk2833]

MINE WAS DOING THIS I PUT INJECTOR CLEANER IN IT AND IT SORTED IT BUT I HAD A DISCOVERY 300 TDI AND THE VACUME PUMP WAS MAKING THAT KNOCK

[@davidgray9897]

Its the setting on the pump to advanced !!! Needs to be reset back to factory settings just about to reset mine ....

[@barokpro5774]

May the tappet make this sound? bcz i face this problem and when i open the firt screw of the pipe of the first injector the sound goes out

[@kamarulhisyam3460]

crankshaft bearings. Mine made same noise and found 2 out of 4 have worn-out.

[@IvanDjurovic-yr9yg]

I have the same sound, does anyone know what the problem is?

[@evertbasson9178]

Valve clearance ?

[@davidgray9897]

Loose tappet ?

[@trailerfitter2]

sounds like the 300 tdi right down to the metallic ringing. Perhaps it is just a combustion knock?

[@rvrnnr987]

Wow! Thanks for replying to this! I've been trying to get people to hear it, or to get it recorded for a long time. I'm glad you think it sounds normal, but I'm curious about possible combustion knock. Assuming the timing is correct on the belt, and the pump, what could cause a knock in a single piston? (In this case, it really does sound like it is coming from #1.)

[@westozbandogs]

@@rvrnnr987 I've got the same thing on my d1 did you find what it is mate ?

[@davidgray9897]

Harmonic balancer keyway slack

[@davelock3166]

Cant hear it. Sure you have not got tinnitus?

[@davidgray9897]

I have same noise on mine i am about to replace harmonic balancer and key ...

[@sandrinifontes476]

Look the tbelt bearing

[@davidgray9897]

@@sandrinifontes476 just recently replaced it i think i am one tooth to advanced evidently they ring like that when advanced on the diesel pump im gunna reset mine next week !!

[@sandrinifontes476]

eccentric shaft sprocket

[@Saleslongtailboatingcom]

Just found this. I have a similar issue. Any more ideas ?

[@sandrinifontes476]

Boas irmao, eu tinha o mesmo barulho, desmontei todo motor para descobrir que o problema era a polia do veio centrico🤣🤣🤣 passei mal

[@KYVTrocks]

Push Pretty Hard against your Injector Lines, is the Noise gone ? On mine the Injector lines started just Swinging ..

[@artyspost]

Did you find the problem?

[@rvrnnr987]

I've not found any actual problem. The engine is running as well as ever, so until something actually goes wrong, I won't be pulling things apart to search for the origin of this noise. I'll see if I can remember to post something here if I ever come across anything.

[@artyspost]

@@rvrnnr987 I am thinking that part of my problem is 10w40 oil. May be to thin. Will change that since it only makes noise when the engine starts to warm up

[@linuxleica]

I have a very similar noise coming from mine

[@linuxleica]

kzbin.info/www/bejne/iGSuepqPgq6UbKc

[@liambird5349]

What was this cheers

[@rvrnnr987]

Never have found out. It seems to have not gotten any worse....?

[@pandakunde]

Did you find the problem? I have the same sound.

[@rvrnnr987]

Nope. It never got worse, never went away. Mostly, I was the only one who could hear it, and usually only when it was in my garage. I've sold the 110! Turning my attention to my '65 Seires IIa that I've had for 20 years.

[@barokpro5774]

Did u know the problem ?

[@sandrinifontes476]

Guys look at the bearing of the tbel

[@pandakunde]

I have the same noise. I found problem, ı @@rvrnnr987