hello guys!
I had my HKS 272's, HKS cam gears and timing/balancer belt on 2 days ago.
I get this humming sound everytime I press on gas. It's comming from where all the things were done. Even on neutral when I press on gas, the humming is still there and it gets louder when I'm pressing the gas harder.

anyone have any idea what could it be and where it's comming from?
I'm going to check if something is rubbing on the belt when I get home later today.

TIA
-Mark

 

Check your tensioner gap, and make sure all the timing marks are correct. Is the balance shaft in phase?

 

bump!

I have this ticking sound as well. could this be the belt as well being tight?

tia

 

sounds like your belts (T-Belt) may be to tight.

 

Man, I just had my cams installed today. The ticking is kind of normal. I got slight ticking stock. As long as the shop that installed your cams bled the lash adjusters when doing the cam install, it should be okay. As for the other sound, check and make sure nothing is rubbing and you have the proper tension on the belts.

 

The guy didn't bled the lifters. I think it only ticks on a cold start. Drove the car this morning and check the engine while the turbo timer is counting down, didn't hear it at all. Should the guy still bleed the lifters?

tia

 

Im sorry, but people saying you HAVE to bleed the lifters when you install cams on an evo is complete nonsense. Most cam installs can be done without bleeding the lifters. We have been doing that with DSMs for years with no problems. My cams on my Evo were installed without bleeding the lifters and I have no problems with ticking.

Scott

 

...but you chance it ticking if you don't bleed the lifters.

As for the humming sound, did you guys follow the correct tension procedure specified by mitsu for the timing belt? It's kind of confusing if it's your first time.

I would get a factory service manual or equivalent and go through the tensioning process again. You could risk damaging or prematurely wearing out something vital.

 

I've always bled the lifters when doing anything with the head, although I'm not sure why. Some engine manuals state that you should NOT bleed the lifters, and that you should actually prime them with oil before re-assembly. Try switching to a different synthetic oil, this often alleviates or cures the problem (I recommend AMSOIL 10-30 turbo formulation).

 

Is this a ticking sound or a humming sound or both?

 

it was both. ticking on a cold start. goes away when it's warmed up.

humming is still there, everyone says it overtightend belt. I have the HKS timing belt which is a lot stronger than stock.

 

It not should be "humming", check the gap on the hydraulic tensioner, and also check to make sure the balance shaft is in phase. An overtightened belt will destroy your engine. A balance shaft that is out of phase will also destroy your engine.

 

Sounds to me like the balance shaft belt is out of wack.

 

Yep thats what I first thought too. This is not good either, I've destroyed a motor before that had the balance shaft bearing go because it wasn't timed correctly.

 

It's also possible the rear shaft ended up out of phase, but most poeple report bshaft problems as a vibration, not a humming. Perhaps some clarification from the OP would help determine which it is.

Also keep in mind that setting the tension is not actually setting the tension. You would have to have the hydraulic tensioner full compressed so the arm is on the tensioner body to actually increase the tension of the belt. If it is not touching but close, it will touch on acceleration when the valve springs resist camshaft acceleration.

Having a bashaft not timed correctly would not cause the bearing to fail, but the front shaft's belt is tensioned with an eccentric pulley, which can be set too tight, unlike the main belt. That is a much more likely root cause.

In the case of the OP, was the tension even redone? If you are just swapping the belt, there is usually no need to adjust the "tension." Compress the tensioner, swap belts, release it, and check the gap. If the previous setting was for a new belt also, I have never seen any change in the gap or need to reset it. If the last tension setting was for a used belt, the gap may get smaller with a new belt (the belt stretches over the first 2000 miles or so of use).

Is anything rubbing on the covers? So adjustable cam gears don't fit well under the top cover, if you're using it, and could make the humming sound you are getting.