Ticking noise after rebuild 70's 911T
 

This weekend I started up my 2.2 T engine for the first time. The initial 20 min and test drives went smoothly, but after the third drive I started hearing a ticking noise. The ticks are in sync with the engine RPM and remain there on various RPM's. I can not determine a location, either left or right, top or bottom. The noise has become more loud, so I don't want to start the engine again.
What can I check without taking the engine out of the car?
Are there any usual suspects that I should check?

Check your rocker lash in the car. It possible to have rocker shaft going off location or the lash changing from running if you over look something in the build.
Chains usually go tight above 2K so it wouldnt change with RPMs
Bruce

While your checking the rockers, push down on each valve to see if there might be a broken spring.
Check to make sure the fan isn't hitting the housing anywhere, or a bad alternator bearing.
Could also be a possible exhaust leak, check around the exhaust manifold.

An update but no good news yet.

Here a link to a movie with the noise https://vimeo.com/46446866

I have checked de flywheel en pressureplate assembly and they are ok. The noise is there with the gearbox in neutral and remains if I press the clutchpedal.
I have opened all valve covers, checked clearences, all rockershaft are still in place, I cannot move the valves by hand and all head studs are still torqued to the correct value. The camshafts look like new.
I have taken off the alternator belt and the noise is still there without the alternator turning.
I have turned over the engine just with the starter motor (ignition disconnected) and the noise is still there.
I have checked the exhaust and found no leaks between the heads and the heat exchangers.

What are my next options?

Thanks for your answers!

Newly rebuilt engine - initial drives went fine. Noise now.
__________________

Something has come loose. A timing gear nut may not have been torqued properly? Timing chain may be slapping case?

Borrow a engine stethoscope and listen to each timing cover and also the distributor housing.

If you can hear it even when turning it with the starter (as mentioned), I would start by pulling the timing covers and have a look.

Tensioner may have failed?

Good luck.

Hi, you may not believe this but I'm actually going through the same thing with my motor right now. Same noise, even my car is red! Mine is a 2.8 High comp RS motor with webers, but it's freshly built and it makes the exact same noise. We've tried just about everything - including changing to fixed tensioners, swapping cam gears, re-timing it, adjusting valves, checking for broken springs and ever tearing down the entire right bank of the motor and inspecting everything.

Next we are going to try and figure out if the cam builder perhaps gave us incorrect cam timing numbers. We've checked the timing to his specs but perhaps they're off. Do you know if your cam timing is 100% correct? How about your rockers, shafts, springs - are they all new or just cleaned up and reused?

Thanks for your input!
I have counted the ticks in the movie and came to about 90 in the 21 secs of film. So that makes about 270 ticks per minute. That is about 1/3 of crank RPM. Is there any logic in this. I would have expected it be in sync with either the cams or the crank, but seems not to match with either:confused:

hello from Italy I'm also under the same conditions
my Ticking noise dark I thought it was a piston QSC
INTERMEDIATE SHAFT total changed
valve springs is ok
SPROCKET dx sx cain changed
DRIVE WHEEL ditributor changed
I'm crazy
excuse my bad English
http://forums.pelicanparts.com/uploa...1343391371.jpg
http://forums.pelicanparts.com/uploa...1343391436.jpghttp://forums.pelicanparts.com/uploa...1343392143.jpg
http://forums.pelicanparts.com/uploa...1343392281.jpg
I do not know what

Is everyone running brand new timing chains?

I'm using brand new endless chains

Me too, brand new and chains are quite tight.

More research, it's not cam timing. I also am pretty sure it's not valves after adjusting them a number of times and pouring lucas oil supplement all over them and running the car.

Is it possible that it's the oil pump? Or the new chains are too tight? Tstat? Mine sounds more like the back side of the motor, towards the right but very similar to the video you posted. Also wondering if it could be the flywheel for some reason?

the noise comes from me right to the cylinder n6
the oil pump can not 'be the noise would be more' continuous grrrrrr.....

I would cut open the oil filter and see what is in the filter element.

I had a similar noise and it turned out to be a blockage on the oil port/gallery to one of the rocker/cam interfaces causing no oil passing to lubricate....check all of your cam lobes and make sure......

Checking on this. I see where the little holes are in the oil spray bar, mine seem to be facing upwards (the photo is looking down from the carbs). Is that correct? Moreover, I've tried turning the car over 5-6 times with the valve covers removed, shouldn't some oil come out of there? Or is it just when the car is running?

https://mail-attachment.googleuserco...dGPVGUyt71xBDI

should go out a lot of oil with the engine running

Thanks. I might check them running. That being said, is that they way the 3 in the openings are supposed to face? Almost directly up, pointing towards the carbs?

What I did yesterday is to use the starter to turn the engine without the ignition on. With the top valve cover of, I quickly saw oil squirting out of the little holes. And yes they point upward, the oil ended on the bottom of the carbs.

Any luck with your car?