100 Series Timing Belt and Water Pump

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strong_toy

strong_toy

10 Year 15 Year
Joined
Sep 13, 2007
Threads
40
Messages
756
Location
Apex, NC
If anyone in the Triangle area is interested in seeing a 4.7 V8 timing belt and water pump replacement (aka 90k service), you are welcome to come by and lend a hand or just watch. I started Friday night and hope to have everything removed today and replaced by tomorrow. I don't necessarily need any help, like a HAMOM, mainly because there isn't much room at the front of the engine for more than one person. But, if you are interested in learning what is involved you are welcome to come and see the process. Please give me a call or PM me if you need directions or to let me know you are coming.
 
I haven't gotten too far yet, but here are a couple of pictures of the first steps...
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Got the radiator out and the timing belt exposed...
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Great progress. You may want to clean the throttle body plate while it is exposed. Mine was covered in gunk. Have to push on it and clean both sides.
 
fourtrax said:
Good progress clint.
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uzj100 said:
Great progress. You may want to clean the throttle body plate while it is exposed. Mine was covered in gunk. Have to push on it and clean both sides.
Click to expand...

So far it is going very smoothly. Removing the cam gear bolts was time consuming. I have never had an easy time with them. This time I used the timing belt tension to hold them in place and used an impact driver to remove the bolts. I figure the belt is going in the trash anyway. The tricky part is torquing them back on the install. I need a strong spanner tool to hold the gears.

I might shoot some throttle body cleaner on the butterfly valve. I will plan on a thorough cleaning of the intake when I do the starter at some point. Since it isn't acting up, I'd rather wait to r&r it.

Here are pics of the timing belt and water pump removed. Now I'm in the process of cleaning and putting everything back together...
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S4Cruiser said:
Seems to be the consensus - darn V based engines...gotta love the in-line sixes :D.

On my S4 it was part of the 60k miles service :frown:.

Looking good Clint!!
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That's terrible, I really can't believe that. I've only had one water pump ever go out on my and that was my first car, 5.0 mustang at 150k, and I was mad about that one.

My myth of toyota reliability is now shattered :D

Good job clint, looks good.
 
lt1fire said:
That's terrible, I really can't believe that. I've only had one water pump ever go out on my and that was my first car, 5.0 mustang at 150k, and I was mad about that one.

My myth of toyota reliability is now shattered :D

Good job clint, looks good.
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I have learned the hard way to replace the water pump with the timing belt. Years ago when I had a 4runner with 3.0 V6, I replaced the timing belt and skipped the water pump at 120k (done at 60k) since it looked fine. Then the water pump blew at about 150k so I had to change the timing belt again. In my opinion it's cheap insurance to change the water pump with the timing belt since you have to remove the belt to get to the pump. Now if the truck has a chain, it's not a big deal to change the water pump since you can get to it from the outside of the engine. Of course it isn't much fun when it fails going down the road (had that happen too).
 
Here are the final pics on the job. Starting with the new water pump and bypass installed. The next two are pics with the new timing belt. Stacy helped with holding tension on the DS cam while I hooked the belt on the PS cam. Turned the crank two revolutions and everything was in time.
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With the engine button back up, I turned my attention to cleaning the radiator fins and flushing the inside. Everything looked good and was much cleaner than the 80's radiator. And then the final pic with the job finished, minus the plastic engine cover... For some reason, the engine took two starts to get going. On the first start, the engine ran for a couple of seconds. The second time, it started fine and ran well. I'm glad the timing belt and water pump are good for another 90k miles.

Next on the list is the DS exhaust manifold...
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Great write-up Clint, clear pics and pretty in depth but yet simple write-up. Glad it all worked out with no problems. I think we need to add this to a tech section on the Club Website and keep a running tool, next HAMOM (which I think is a front axle rebuild should be another documented ONSC tech link.
 
I hadn't intended this to be a tech write-up. Just a brief overview. I would be happy as I have time to put a write-up on the ONSC site. Main point would be to show pictures and make notes of how I did it as a supplement to the FSM. Actually, the FSM was very helpful because it showed bolt locations, quantity, etc. Unfortunately, I wasn't too impressed with the write-ups I found in the 100 section. The faq articles mainly focused on what not to do.
 
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