YotaTech Forums  

Go Back   YotaTech Forums > Tech Write-Ups (Staging Area & More Articles In The Wiki) > Maintenance & Repair
Sign in using an external account
Register Forgot Password?
Search


Maintenance & Repair Care and feeding of your rig

Welcome to Yotatech!
Welcome to Yotatech,

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!


Reply
 
LinkBack Thread Tools Search this Thread
Old 01-04-2011, 11:05 PM   #1
Registered User
Personal Sales Rating: (0)
 
PismoJoe's Avatar
 
Join Date: Jan 2010
Location: Pismo Beach, California
Posts: 2,244
5VZ-FE/3RZ-FE/2RZ-FE Valve Adjustment Tech

Have a 5VZ-FE,2RZ-FE or 3RZ-FE that needs a valve adjustment? Here's How!

In this write up, a 5VZ-FE is being used. The 3RZ-FE and 2RZ-FE require the same valve adjustment method, so this applies to those engines as well.

Required tools:

-Digital Dial Caliper
-Various Valve Shim Sizes
-Feeler Gauge Set
-Flathead Screwdriver
-12mm Socket
-Wrench to turn the cam if head is off, or 19mm socket to turn the crank if the head is installed

*ALL 3RZ/2RZ/5VZ valve adjustments are done with the engine COLD*

In this case, the cylinder head is not yet installed. If the head is installed, turn the engine to TDC and mark the position of the cam sprockets in relation to each other before removing the camshafts.

Click the image to open in full size.
If you look at the back of the cam sprockets, there is a dot on each cam, which are the timing marks. These 2 dots should be facing each other when the cam is installed. It helps to make it a little more visible to yourself, I used a marker. Note: If engine is assembled, turn to TDC and paint a mark across the cams.


Click the image to open in full size.
The next step is to take a feeler gauge and see what the valve clearances are currently at. This head was brand new, so the valves were extremely out of spec. You might find zero clearances, which is not good.
-Go through and write the clearances on the cylinder head. The number on the left is the next size down of the clearance, the right is the actual clearance. These measurements are in inches. (.009,.010, etc.)


Click the image to open in full size.
A wrench can be used on the cam service bolt to turn the cam into the desired position to check clearances. If the head is installed, DO NOT turn the cam by this bolt. Instead, turn the engine over with a 19mm socket on the crankshaft pulley bolt.

2RZ/3RZ Valve Clearances: COLD
Intake: .015-.025mm (.006-.010 in.)
Exhaust: .025-.035mm (.010-.014 in.)

5VZ Valve Clearances: COLD
Intake: .013-.023mm (.006-.009 in.)
Exhast: .027-.037mm (.011-.014 in.)

The next step is to remove the cam.


Click the image to open in full size.
If you look at the cams from the side, you'll notice that one cam sprocket has 2 pieces. Between the cams is a spring that applies tension in order to keep the cams lined up at all times.


Click the image to open in full size.
You need to install a bolt through this threaded hole (circled in pic below) PRIOR to removing the cam so that the cam sprocket stays together.

*Hint* this bolt can be easily left in by accident after the cam has been reinstalled. To avoid this, use a valve cover bolt. It is the same size bolt as the one that is needed to hold the cams together. When you come up a valve cover bolt short, you know where it is!


Click the image to open in full size.
To remove the cam, remove the 12mm cam cap bolts and caps, and lift it the cam out. Note the order of the cam caps upon removal.


Click the image to open in full size.
Cam Removed


Click the image to open in full size.
Now for the gnar part

Here is a pic of a valve shim that was causing a .010" clearance. A 009" feeler gauge would not fit.

The spec for this 5VZ exhaust valve is .011-.014". Since the clearance was .010" (which is to tight), we need to go DOWN .004" in shim size to achieve the correct .014" valve clearance. (.014-.010 = .004")

To remove the shims, pop them out with a flathead screwdriver.


Click the image to open in full size.
Next, remove the shim. You need to measure it to see how thick it is.

You'll notice there is a dot in the middle, this is burned on sludge. DO NOT measure the shim over that dot, it will read an incorrect measurement.


Click the image to open in full size.
The shim measures .114" with a .010" valve clearance

Now, remember the .004" thinner shim that we need? That means we need our shim to measure .110" in order to have the correct clearance. (.114-.004 = .110)

The exhaust valves should be set on the loose side, measuring AT LEAST the max clearance (.014"), .015" is a good cushion.

Intake valves run much cooler than exhaust valves, so the clearances are less crucial. If an exhaust valve is to tight, it will burn and then you're bummed.


Click the image to open in full size.

Our goal for the exhaust valve clearance is .015". The shim measured .114" with a .010" valve clearance, so we need a shim that is .005" thinner.

The the shim new should measure .109" thick. (.114" old shim - .005" for new shim = .109" shim)

Using your hands, set the dial caliper to the size shim you need. In our case, it is .109".

The dial caliper measurement is still in inches.


Click the image to open in full size.
Now hit the MM button on your digital caliper. Now the shim size that you need is converted from inches to MM, which is how Toyota sizes shims.

The measurement in MM for our desired shim is .277mm. (.109")

-Find the shim that is closest to this measurement, and install it.
-Repeat this for every valve on both the intake and exhaust valves.
-Reinstall the cam. Don't forget that sprocket bolt!
-Recheck valve clearances. If they are still incorrect, repeat the process as needed.
-In this example, the exhaust valve clearance was too tight, so we needed to DOWN in shim size. If the valve clearance is too loose, you need to go UP in shim size.

Hope this helps some people out!
This ad is not displayed to registered members.
Register your free account today and become a member on Yotatech!
__________________
2002 Tacoma Slightly Modified
1986 4Runner SAS & 2RZ Swap

Quote:
Originally Posted by kiyobrown View Post
Moron....Taser.... Problem solved.
Help Prevent Dune Closure! Support Friends of Oceano Dunes

Last edited by PismoJoe; 05-08-2012 at 08:27 PM.
PismoJoe is offline   Reply With Quote
Old 01-04-2011, 11:05 PM
Yotatech
4WD Truck




Paid Advertisement
Reply

Tags
3rz, 3rzfe, 5vzfe, bolts, cam, camshafts, cylinder, dial, exaust, exhaust, fe, head, intake, matching, size, socket, valve

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -8. The time now is 06:10 AM.


2010 InternetBrands, Inc.