From where are these noise?

T

Thor

Member
Hello!

we have a very loud noise at an engine. When it run at idle the knock went above 40 level and if i give them more rev ~ 4000 rpm the knock level is at 100!

Oil preassure is ok and the valve clearance was checked too!

If anybody can give me an advise i would happy!

[video]http://s624.photobucket.com/albums/tt328/thor77_2009/?action=view&current=VID_20120608_150607.mp4[/video]

regards
sascha
 
F

fast eddy

New Member
You should be able to find where the noise is with automotive stethoscope or if you don't have one a long screwdriver with your ear to it
 
wrc

wrc

Member
Exactly as above, sounds like blocked spray bars. They are easy to remove and clean.

Possibly needs shimming??
 
T

Thor

Member
hi!

the spray bars we had cleaned and refit.

The valve clearance is ok too!

As i heard with a stethoscope the loudest place was at the throttle (inlet side).
 
M

MarkTurbo

Well-Known Member
I would have said valve clearances to start with. What about injectors, some are quite noisy?

Not sure if they would be noisy enough to be picked up on a knock meter though.
 
fubar andy

fubar andy

Moderator & N/W Rep
Staff member
Shims need re-doing

I had this ages ago, checked all of the above and ended having the shims re-done just after my rebuild. Sound went away!
 
S

skiddusmarkus

Active Member
My injectors are very loud, almost sounds tappety.You haven't dropped a nut down the back of the engine have you and it's rattling away?
 
T

Thor

Member
I had checked the clearance is 0.15 ex and 0.20 in. So maybe the metal from where are the shims was made is wrong? A friend of me had made these shims via CNC but if the steel grade are similar than the OEM shims i don´t know.

The Denso 1000cc injectors are ever very loud!
 
P

pulsarboby

Guest
i tend to agree with danny and say little ends or possibly piston slap
did you use j.e pistons?
 
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