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Old 03-18-2013, 05:43 AM   #29
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Chaffeekid's Avatar
Join Date: Dec 2011
Location: Chaffee, MO.
Posts: 399
Hey Mike, If you are going for a cummins of 99-01 be aware of the "53" block. Search the forums for this information. Some of these blocks have a weak area just above the Freeze plugs on the passenger side. Some, (Cummins states less than 1%), have developed cracks and weep coolant. Before you close on any motor home of this vintage, crawl under and look for the 53 molded into the block, just above the oil pan on the passenger side, and then carefully inspect with a flashlight the area just below the head and above the freeze plugs, any signs of water stains on the side of the block should send you running

Now not all are bad. I have a "53" block in my fleetwood, it performs flawlessly and gets great fuel mileage. Also it is an ISB engine which means amoung other things, it is NOT a wet cylinder type so you don't have to worry about cavation, or adding SCA's to your coolant.

The cummins you will encounter will probably be a 5.9L that is what mine is, but if you can find a 6.7L ISB that is the one I would buy. Like I said mine is the 5.9L 300 hP (270) boosted to 300. I'm not the first to the top of the hill, but I get from 10.5 to 12+MPG on my little 5.9L and that is towing my Ram 4X4.
Search on the Cummins site on this forum and you should turn up the info on the 53 engines, not a deal killer but something to be aware of.
Hope this helps
Happy Trails

MGySgt USMC(R) 1961-1991
2001 Fleetwood Expedition
2013 Jeep Wrangler Sierra Toad
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Old 03-18-2013, 01:04 PM   #30
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Old 03-18-2013, 01:35 PM   #31
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