Possible Lifter Noise After Cam Gear Install

[Kwyjibo]

Hi,

Just installed a set of adjustable cam gears and am now getting quite a loud ticking noise that sounds like very loud lifter noise. Car has never had lifters that loud so just asking for suggestions on what to check when I take the cam covers back off. All timing is fine(marks were lined up, ignition timing looks good) and I'm quite sure belts are tensioned correctly. The sound increases in frequency as the revs increase. I can't think of anything that would actually affect the lifters noise wise if timing is correct. Engine is an RB20DET and its idling perfectly fine and revving fine regardless of the noise.

Cheers,

Adrian

Edited October 4, 2009 by Kwyjibo

[Moodles2]

It's possible the Cam Angle Sensor is making the noise because it isn't perfectly flush against the timing cover, or the timing cover itself isnt flush against the backing plate throwing off the CAS.. it's also possible the screws that hold the CAS in place might be nicking or coming very close to the slider bolts (hard to tell without a clear cover) on the exhaust cam gear causing a resonance noise.

[Kwyjibo]

Thanks I'll check that out. I also just noticed that it doesn't make a noise when revs are dropping, only when hodling steady or rising.

Cheers,

Adrian

[JCaSs1001]

did u check the idler and tensioner bearings??? also check the belt isnt over/under tightend

[Kwyjibo]

Well I guess one of the issues is I'm not 100% sure how tight it should be. I can move it about 5mm using one finger which is what seemed to be recommended on here. Idler/tensioner were changed 15,000 km ago.

[Kwyjibo]

Alright I pulled out CAS and put it back in then reset timing to 15 degrees and noise has quitened to the point where I can only hear it slightly if bonnet is open and I lean in towards the cam/intake valve cover area. I opened the oil cap and its defintely coming from intake side but its so quiet now I'm not particularly worried about it as its probably a different noise all together and had I not been listening out for it I never would have noticed it.

I ran the car with cam cover off and some spacers to see if anything is fouling and it all looks good. Can anyone tell me exactly how to tell if timing belt is correct tightness though? Its making a whirring sound which some people say is common with Gates belts that are slightly too tight.

Edited October 5, 2009 by Kwyjibo

[frozenwaffles]

if its not making the noise when slowing down then its your injectors. they are not firing when you are on decel.

[gotRICE?]

if its not making the noise when slowing down then its your injectors. they are not firing when you are on decel.

They dont?? Where does the fuel come from?

BTW this isnt intended as a cheeky question, is genuine.

Edited October 5, 2009 by gotRICE?

[frozenwaffles]

when you are decelerating the injectors are not firing and the engine is just a big air pump... no 'bang bang'

[Kwyjibo]

Thanks for the help everyone.

Cheers,

Adrian