Idler pulley, hoses and water pump

[Alan Reagan]

At 150,000 on the clock, I decided it was time to do the full maintenance on the cooling system.



I changed the water pump and hoses plus the thermostat. I couldn't immediately get my hands on a tensioner pulley so I ordered one. The next morning on the way to the parts store, the truck started having what I thought was belt squeak.



I checked the belt allignment and all was well so I figured with the anti-freeze drip with the water pump change that it would stop. Turns out, by the time I got back to the house, it was chirping pretty good.



It was the idler pulley. I changed it as planned and that stopped the chirping/squeaking.



One thing is for sure, that pulley will be an addition to my truck box of stuff.



I was happy to see when I pulled the OEM pulley that it was a Dayco which is the same one Advance Auto Parts sold me.



I just did the belt a few months back so I'll wait a while on it.

 

[KLauber]

Just changed the belt on my 03 at 209K a week before I traded it in. WHile laying under the truck as Will fished the belt down from above, i felt a bit of play in the power steering pulley. The tensioner was fine though. BTW, I put the old belt under the seat as an emergency spare for the next driver.

Ken

 

[steved]

Keep in mind there are two "idler" pulleys... one on the tensioner, the other is fixed to the block. The tensioner pulley is readily available, I didn't see a source for the other. Not to mention the fan support bearing.

I pulled the seal on the upper one (all it takes is a dental pick), and found it almost dry of grease at 200k... I added grease using a hypodermic grease needle. I didn't have really good grease at the time, but anything was better than nothing.

 

[mwilson]

Idler Pulley

Item # 10

Cummins Part # 4946708

Over the counter price is $32. 81





Fan Hub Bearing

Item # 5

Cummins Part # 3910739

Over the counter price is $175. 23



My counter men have added a note in the computer regarding this bearing.



"CAN USE NSK 8D35-12DU8A BEARING, MUCH CHEAPER. "



We have been here before.

 

[Alan Reagan]

Steved and mwilson,



Good posts and thanks. I was only talking about the tensioner. Wasn't thinking about the upper one.



Thanks for the part numbers MWilson.



The upper one should be fun to change.



Have a good day, guys.

 

[steved]

The upper one should be fun to change.

Its actually easy... take the belt loose, one bolt and it falls off. And all from up top.