This is a little walk through of replacing the timing chain guide
(straight guide, not the curved) without taking apart the whole front
end of the motor apart. This is a difficulty rating 3/5, though this was
really easy for me, many others may find this pretty tricky to do. You
will need to take it slow and not to rush this process. It took me just
under 30 minutes to do this, but you can look at it taking around an
hour or more. There are tools you will need to have to do this job or
else you will have to tear down the timing cover which is rated at 11.9
hours on a 4wd with power steering and A/C.
I have performed this on three Toyota trucks, all a success!
First off is the tools you will need, one is the most crucial and that
is a long double box end, 0° Offset wrench, one side needs to be a 12mm.
This tool is what makes it all possible.
Other tools as followed:
From top to bottom:
a) extra long, heavy duty (cannot flex) flat blade screw driver
b) 19mm shallow socket x2
c) 1/2' torque wrench
d) long 1/2' ratchet (flex head makes it a little easier)
e) 12mm 0° Offset wrench (has to be at least a foot long, this is the most important tool!!!)
f) 1/2' standard lenght ratchet
g) part pickup tool
h) 1/4' standard ratchet
i) medium length extension with 8mm socket
j) 1/4' long flex head ratchet (optional)
k) regular 12mm wrench
(not pictures is a 12mm socket to be used on the flex head 1/4' ratchet during removal of valve cover)
Now for the guide replacement:
1. REMOVE VALVE COVER
(a) Remove the ground strap from the body.
(b) Remove the four nuts and seals.
(c) Remove the valve cover.
2. REMOVE CAM SPROCKET BOLT
(a) Turn the crankshaft (using the 1/2' short ratchet with 19mm socket) until the No. 1 cylinder position is
set at TDC compression. (note take off distributor cap to verify firing
on #1 cylinder. MARK on the distributor with marker or paint pen for the
position of the rotor!!!)
(b) Place matchmarks on the sprocket and chain.
(c) Remove the half-circular plug.
(d) Remove the cam sprocket bolt. **(torque spec is 60ftlbs) (keeping
the crankshaft in place with the smaller 1/2' ratchet, and using the
long one to break the bolt loose, after that yoy should be able to
unscrew by hand)
3. REMOVE DISTRIBUTOR DRIVE GEAR AND CAM-
SHAFT THRUST PLATE (the distributor rotor will move out of place, thus the importance of marking the distributor)
4. REMOVE CAM SPROCKET
Remove the cam sprocket and chain from the cam-
shaft and leave on the vibration damper.
a) once you remove the cam sprocket, using string or wire, tie the chain off the the side out of the way.
(note: the purple wire holding the chain the the throttle body side)
b) once the chain is out of the way, using the long box 12mm 0° Offset
wrench to take out the two bolts holding the straight guide in place(be
extra carefull when taking out the bolts as they can fall into the oil
pan). Take your time on this step since it is the most time consuming.
Pull out all the old pieces of the old guide and once complete, install
the new guide taking care to not drop the bolts. It is easier to install
the top bolt first, but not tight as the guide will need to be able to
move a little when installing the bottom bolt. The bottom bolt is the
trickiest to install but patience is key here. Once the bottom is tight,
set the top bolt tight as well and reinstall the rest of the components
in reverse order!