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Old 12-10-2007, 06:41 PM   #1
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Default Idler Pulley Removal Mod with Pics

This is a very simple mod with no drawbacks! Basically, the idea is to remove one of the idler pulleys and its bracket from the front of the motor. The advantages are that you will remove 3# of weight from the front of the car, and you are eliminating a pulley from the system. (you never know when a bearing failure is around the corner. )

This is a great mod to do anytime; it is especially good to do if it is time to change yoru accesory belts. My belts had over 30,000 miles on them, and they were showing a fair amount of cracking.....So, I bought new belts. This mod requires the use a 1" shorter belt than stock for the Alt and P/S belt. The A/C belt still uses the normal stock length belt.

This is how the stock pulleys are arranged.

Click the image to open in full size.

Here's a pic of Z1Performance's engine. You can see the idler pulley on the front of his motor:

Click the image to open in full size.

Here is the plan when we are all finished:

Click the image to open in full size.


Write up and more pics to come............................(I'm writing it now. )
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Old 12-10-2007, 06:46 PM   #2
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Does removing one passive pulley increase whp?
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Old 12-10-2007, 06:52 PM   #3
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Quote:
Originally Posted by gothchick
Does removing one passive pulley increase whp?

I doubt it.....it is just added weight and the pulley serves no real purpose. Inifiniti still uses the DE motor is some applications and they no longer have this pulley on the front of the motor any more.
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Old 12-10-2007, 07:03 PM   #4
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Start by removing both drive belts. To do this, you'll need to jack up the car and secure it with jack stands or some other sort of safety device!!!!!

Once secure, remove the underbelly pan. You'll need to use a 10mm socket to drop the pan.

When the belly pan is removed, you will have access to both belt tensioners. Each tensioner pulley has a locking nut on the face of the pulley. Use a 14mm socket to loosent he nut. Once the nuts are loose, you can then use the adjuster bolts. They are on the underside of the pulley and the bolt head face straight down toward the ground. Turn the adjuster bolts counter clockwose to release the tension on the drive belts. Obviously, you will need to do each belt one at a time.

Once the tension is released, you can slide the belts off of the pulleys!

Now, it is time to get to the removal of the idler pulley assembly!!!!

Click the image to open in full size.

As the arrows in the pic show, you need to remove they 4 bolts to remove the pulley from the brakcet. Use a 10mm socket to remove these bolts. It is kind of hard because the pulley wants to turn. I used an air ratchet, and it was no problem. I tried to do this procedure without taking the pulley off, but then you can't get the bracket off...in the next step!

Once the four bolts are out, the pulley just slides right off the nose of the bracket! Ahhh...something easy.
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Old 12-10-2007, 07:13 PM   #5
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Now, you should have easy access to the idler pulley bracket. I'll get some better picks tomorrow. (my pulley/bracket are at my shop, and I forgot to snap some pics while I was there. ) In the man time, I'll continue to use this pic:

Click the image to open in full size.

As the pic shows, there are 3 bolts that hold the bracket to the front timing cover. The 2 bolts that you can see in the pic both have a 17mm head on them. I used a 24" breaker bar to get some extra leverage. They are on there pretty tight!. The breaker bar makes tough bolts a snap to loosen.

Click the image to open in full size.

The other bolt has a 14mm head (can't be seen in the pic.) Use the breaker bar to get this bolt started too. This bolt goes through the Power Steering pump bracket and then into this pulley bracket. More on that later!

Finally, now that all 3 bolts are loose, go ahead and remove all of them. Once the bolts are out, the bracket should slide out (to the right) from under the Power Sterring pump bracket.

Once the idler pulley bracket is out of the engine, you can go ahead and put the 2 17mm bolts (bolts 1&2 in the pic above) back into the timing cover. These bolts will screw all the way back in to the engine. Torque them down to 55 ft-lb.

Now comes the fun part!!!!!..........................
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Old 12-10-2007, 07:34 PM   #6
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UPDATED: now with some pics!

What we have to do is to cut off of of the mounting tabs from the idler pulley bracket. You need to cut off the tab that originally was under the Power Steering Bracket. Because the power steering pump bracket doesn't mount straight to the block, we need to make a spacer to fit between the block and the P/S Pump bracket. To make the spacer, cut off the idler pulley mounting tab with a hack saw (slow) or some sort of power saw. I used an air-powered cut off tool. A dremel may be up to the job, but don't come after me if you smoke your weaksauce Dremel!!!

Click the image to open in full size. Click the image to open in full size.

Here's a closer look at how I cut off the tab:

Click the image to open in full size.

I used one of these to cut it off:

Click the image to open in full size.

Cut the mounting tab off so that the original mounting pad in undisturbed. Once you have this small piece, you can choose to make it look nicer by sanding/grinding to it is relatively round.....and looks like a spacer.

Here's mine:

Click the image to open in full size.

Here's a bigger shot. You can see the spacer hiding in there.....straight down from the green plug.

Click the image to open in full size.


Obviously, you need to slide the spacer back into the motor. place the spacer between the P/S pump bracket and the block. Then, slide the 14mm bolt back into the P/S pump bracket, though the spacer, and into the block. Tighten it down, and torque it to 45 ft-lbs!
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Last edited by QuadCam; 12-12-2007 at 06:43 PM..
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Old 12-10-2007, 07:37 PM   #7
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good write up, but what is the real benefit of doing this, beside a little weight loss?
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Old 12-10-2007, 07:43 PM   #8
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You are done with the mod!!! Just put your new belts onto the motor.
Here's the belt you'll need. this one is from Napa, but it is essentially a Gates part number:

Click the image to open in full size.

Use this diagram for routing the belts:

Click the image to open in full size.

Once the belts are in place, snug up the tensioners and remember to torque down the locking nut on each tensioner pulley to 26 ft-lbs. USe this Diagram for reference.

Click the image to open in full size.

Button up the belly pan, and lower you car back to the ground. YOU ARE DONE!!!!!
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Last edited by QuadCam; 12-12-2007 at 06:45 PM..
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Old 12-10-2007, 07:45 PM   #9
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Quote:
Originally Posted by Escobar
good write up, but what is the real benefit of doing this, beside a little weight loss?

gets rid of useless crud on the car! Like I said previously, it is a good mod to do when it comes time to change your belts.

Plus, if you have a nice lookign powder coated timing cover waiting to go on your engine, this'll just makes everything look better......

Click the image to open in full size.
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Last edited by QuadCam; 12-10-2007 at 07:48 PM..
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Old 12-11-2007, 06:52 AM   #10
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Great write up! :-)

What size belt is needed to complete this mod?
Also, does anybody know how much that idler pulley weights?
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Old 12-11-2007, 11:45 AM   #11
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Quote:
Originally Posted by gothchick
Great write up! :-)

What size belt is needed to complete this mod?
Also, does anybody know how much that idler pulley weights?

Chick,

I don't recall the belt size off hand. I can get the Gates part number for you if you like. The belt is 1" shorter than the stock size though.
I will go out to my shop this afternoon and get some more pics.

I think the belt is a K060455. The stock size is a K060465.
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Old 12-11-2007, 11:46 AM   #12
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Oh yeah.............the pulley and bracket weigh approximately 3 pounds.
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Old 12-11-2007, 12:01 PM   #13
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and for the non revup vortech guys that have the new pulley layout, you can do this mod as well. The new pulley layout does not use that pulley at all.

Only thing im concerned about is cutting the bracket. Id rather use a spacer and keep the bracket in tack.

thanks for the write up.
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Old 12-11-2007, 12:10 PM   #14
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Quote:
Originally Posted by CUxtopher
and for the non revup vortech guys that have the new pulley layout, you can do this mod as well. The new pulley layout does not use that pulley at all.

Only thing im concerned about is cutting the bracket. Id rather use a spacer and keep the bracket in tack.

thanks for the write up.
I am trying to find out the part number for the spacer that Infiniti now uses. It is ony a few bucks for the spacer.
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Old 12-11-2007, 12:29 PM   #15
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You say that the pulley doesn't really do anything. What is it SUPPOSED to do?
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Old 12-11-2007, 12:30 PM   #16
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The rev up Vortechs completely bypass it.
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Old 12-11-2007, 12:37 PM   #17
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looks like this is it. Its integrated into the bracket:

Collision Catalog - 2007 - Infiniti - G35 sedan
Steering gear and linkage, Pump and hoses, P/s pump, Mount bracket, W/o active steering

Part 1 is off the 07 G35 sedan, Part 6 is off an 03 350z

not sure if they have a washer for it or not. I may be way off though. I dont think part 2 is compatible with the 350z.

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Old 12-11-2007, 12:38 PM   #18
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Cool! I'v always wondered why that idler pulley is there, and if its removable. I will do this when i change my belts.
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Old 12-11-2007, 12:39 PM   #19
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Quote:
Originally Posted by Wired 24/7
You say that the pulley doesn't really do anything. What is it SUPPOSED to do?

It is currently taking up slack. It is not necessary to have it. Keep it if you want to, or remove it if you want to.
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Old 12-11-2007, 12:40 PM   #20
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Quote:
Originally Posted by CUxtopher
looks like this is it. Its integrated into the bracket:

Collision Catalog - 2007 - Infiniti - G35 sedan
Steering gear and linkage, Pump and hoses, P/s pump, Mount bracket, W/o active steering

Part 1 is off the 07 G35 sedan, Part 6 is off an 03 350z

not sure if they have a washer for it or not. I may be way off though. I dont think part 2 is compatible with the 350z.

no, that's not it. Inifiniti has a small sleeve similar to what I made when I cut/ground the bracket.
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Old 12-11-2007, 12:40 PM
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