Guest mu2drvr@aol.com Posted July 20, 2022 Share Posted July 20, 2022 2005 Signature, Cummins ISM. After stopping for the day (Redding CA), discovered alternator belt broken. Further investigation found pulley to right of alternator had seized bearing. Took mount and pulley to Freightliner for bearing replacement. BAD NEWS: when bearing seized it welded the itself to the spindle mount. Also hogged out inside of pulley. Cummins has told me they can't identify these parts as they were provided / installed by Monaco. REV group was unable to access their Monaco system for tech reasons all day, so no help there yet. Freightliner shop told me this mount would be called a 'fan drive" if it were mounted in a truck. You can see on the pulley where a fan would be installed. In the coach application all this pulley does is rout the alternator belt down to the crankshaft. No response yet from salvage yards. What initially looked like a simple repair has turned into a parts sourcing nightmare. Any ideas ?? Thanks, Steve A 2005 Signature, Cummins ISM 2020 Ford Escape Hybrid Link to comment Share on other sites More sharing options...
DavidL Posted July 20, 2022 Share Posted July 20, 2022 (edited) Pop the old bearing out and look for part numbers. Google part number and buy the bearing. You might need a hydraulic press or good control of a large socket / hammer. If no part numbers, just measure the OD and ID and find the right bearing. If truly you can't find the assembly and the outside of the bearing spun, it's possible a machine shop can bush or weld / lathe the pulley so the original bearing will fit again. From the pics, it just looks like the bearing failed which is pretty easy to replace. Edited July 20, 2022 by DavidL Link to comment Share on other sites More sharing options...
Dr4Film Posted July 20, 2022 Share Posted July 20, 2022 Is it possible to mount a different idler pully to that location and install a serpentine belt that would be of the proper length needed to fit all of the pulleys? Link to comment Share on other sites More sharing options...
cbr046 Posted July 20, 2022 Share Posted July 20, 2022 Don't forget to match the number of ribs if you replace the pulley itself. On autos I think some ribs are v shaped while some are u shaped. - bob Link to comment Share on other sites More sharing options...
Guest mu2drvr@aol.com Posted July 20, 2022 Share Posted July 20, 2022 The iron part that mounts to engine block and provides a spindle for this pulley is not serviceable. Not sure about reworking the pulley itself for another bearing, it is pretty trashed. Going to investigate rerouting with a different (shorter) belt, but may find interference issues. Just heard back from REV. They tell me these are Cummins parts! Cummins is where I started. Aaahhhccckkk ... My engine specifics: ISM-02-500, SER# 35089957 Link to comment Share on other sites More sharing options...
Gary M Posted July 20, 2022 Share Posted July 20, 2022 I’m asking the rest of you a dumb question. So that pulley and mount is something that Monaco had to have made and is not part of the Cummins engine? Inquiring minds want to know. Link to comment Share on other sites More sharing options...
Dr4Film Posted July 20, 2022 Share Posted July 20, 2022 Gary, it is my understanding that the pulley was used to mount a fan when the engine is mounted normally in a truck that had a front mounted radiator. Link to comment Share on other sites More sharing options...
Gary M Posted July 20, 2022 Share Posted July 20, 2022 (edited) 8 minutes ago, Dr4Film said: Gary, it is my understanding that the pulley was used to mount a fan when the engine is mounted normally in a truck that had a front mounted radiator. So that is a Cummins part! And I assume not available. I’ve had to repair many frozen bearings to pulleys in my line of work. Soak um and heat pulley while pressing bearing out. Worse thing is ya destroy pulley but the worst for me was to take pulley to machine shop and bore out and re-sleeve. But he’s kinda stuck. Edited July 20, 2022 by Gary M Link to comment Share on other sites More sharing options...
vito.a Posted July 20, 2022 Share Posted July 20, 2022 (edited) Yes. This is definitely a Cummins part. One of the aftermarket companies was reproducing it also. I think it was Dayco. A good truck parts man would know. Edited July 20, 2022 by vito.a Link to comment Share on other sites More sharing options...
streetrodder Posted July 20, 2022 Share Posted July 20, 2022 a good machine shop can fix this hands down!!!! might have to travel to chico I know of one in Marysville 1 Link to comment Share on other sites More sharing options...
Jdw12345 Posted July 20, 2022 Share Posted July 20, 2022 Ouch! so in other words we should try and lube that bearing, I have an ISL so I’ll have to look at it. A couple of years ago I removed all of the idler pulley bearings on my Powerstoke and repacked them, truck now has 371’xxx miles on original pulley bearings. Link to comment Share on other sites More sharing options...
engine103 Posted July 20, 2022 Share Posted July 20, 2022 I don't know if your still in Redding but a couple of years ago with my ISM I had a major electrical break down and was recommended to A&N Diesel LLC who works on Monaco and Beaver Coach. Name is Steve Ashe # 530 221 0460. We were on a trip through California, he dropped his other jobs and spent a week sourcing and repairing. I was surprised at his invoice, much lower than expected. Might be worth a try. Link to comment Share on other sites More sharing options...
timaz996 Posted July 20, 2022 Share Posted July 20, 2022 32 minutes ago, vito.a said: Yes. This is definitely a Cummins part. One of the aftermarket companies was reproducing it also. I think it was Dayco. A good truck parts man would know. My experiences with Cummins has never been good. Customer service is not something they care about. Cummins use to sell the ISC Caps pump in there separate pieces just as it is removed from the engine. They decided to make a whole lot more money by only selling the complete pump because they had so many failures. The failure part of the pump was $300-350. The whole pump is $6500. Not my favorite company. 1 Link to comment Share on other sites More sharing options...
Tom Whitlow Posted July 20, 2022 Share Posted July 20, 2022 I second that opinion of Cummins. Link to comment Share on other sites More sharing options...
Ivan K Posted July 20, 2022 Share Posted July 20, 2022 I find it amazing that they made the routing so complex because of a fan that you don't even have. Our alternator is turned by water pump pulley and nothing else in the way. Wonder if it is something you could do instead. Don't have a better pic handy at the moment. Link to comment Share on other sites More sharing options...
Guest mu2drvr@aol.com Posted July 20, 2022 Share Posted July 20, 2022 Ivan: Is your engine ISM ?? Interesting .. Does it use 8 rib belt or V-belt, and how does it tension ?? Link to comment Share on other sites More sharing options...
Dr4Film Posted July 20, 2022 Share Posted July 20, 2022 Steve, if you look at his engine, notice that it doesn't have a serpentine belt. Not sure what engine he has. Link to comment Share on other sites More sharing options...
Ivan K Posted July 20, 2022 Share Posted July 20, 2022 31 minutes ago, mu2drvr@aol.com said: Ivan: Is your engine ISM ?? Interesting .. Does it use 8 rib belt or V-belt, and how does it tension ?? Steve, yes it is an ISM500. It's got two independent short serpentine belts. The AC belt has a tensioner, alternator belt is tensioned by alternator's angle, just like cars used to be. I don't remember how many ribs but if you thought that it was important, I would go look. Link to comment Share on other sites More sharing options...
timaz996 Posted July 20, 2022 Share Posted July 20, 2022 He has an ISM as you can see in this picture. Link to comment Share on other sites More sharing options...
Guest mu2drvr@aol.com Posted July 21, 2022 Share Posted July 21, 2022 Ivan: Where your water pump is mounted I have just an idler pulley. The alternator mount has no movement. Link to comment Share on other sites More sharing options...
Ivan K Posted July 21, 2022 Share Posted July 21, 2022 (edited) 1 hour ago, mu2drvr@aol.com said: Ivan: Where your water pump is mounted I have just an idler pulley. The alternator mount has no movement. Yes, I see that. Yours looks like this one and the fan hub is definitely Cummins part. This is from their service manual. Just curious, is it the original motor? Just because of the markings on it. Edited July 21, 2022 by Ivan K Link to comment Share on other sites More sharing options...
Tom Whitlow Posted July 21, 2022 Share Posted July 21, 2022 I have the ISM and both my belts have tensioners. Link to comment Share on other sites More sharing options...
Dr4Film Posted July 21, 2022 Share Posted July 21, 2022 3 minutes ago, Tom Whitlow said: I have the ISM and both my belts have tensioners. Snowflakes for sure. There is no standard when it comes to Monaco or now Cummins. Link to comment Share on other sites More sharing options...
Guest mu2drvr@aol.com Posted July 22, 2022 Share Posted July 22, 2022 Ivan: I assume this to be the original engine. I am 3rd owner. Unable to read labeling on valve cover, REV gave me the engine serial number. Your diagram part #5 is exactly what I’m looking for. Link to comment Share on other sites More sharing options...
Ivan K Posted July 22, 2022 Share Posted July 22, 2022 Steve, unfortunately my manual does not list a part number for #5 but if you get an account with quickserve for your SN, it might show it. No numbers on the hub casting I suppose either. I don't have the best experience with their parts department either but a competent sales person should be able to locate it. Here is one but not sure about the stand off. I bet they are very proud of it... Link to comment Share on other sites More sharing options...
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