Does anyone know how many rv's have the 53 block
I have found the number on my block
but i'm nervous
is it common on rv's or dodge trucks
thanks

I cannot answer your question directly.

I have a 53 block also. Cummins claims that only about 1% of the engines have the cracking problem near the exhaust problem. Since I discovered that the problems exists, inspection of that area is one of the things that I do every time I'm under there. Cummins claims that they "can" provide help if an engine develops the cracking problem.

If you want to be really nervous, research KDP (killer dowel pin). Cummins claims that the problem was isolated to the pickup truck version of the 5.9. I guess I have the choice to believe them or go find the information to perform the corrective action. I'd taking the cracking any day to the KDP.

Charlie

looked under there today and found a -B-
on the side of the oil filter
and b2 - 04m8a1 on the other side
i think im happy theres no 53
does anyone know what the b means

The In laws had a # 53 5.9 block that started to leak coolant after 60-k and 7 years.
Cummins provided a new block and split the labor with them. That left them with about a $5,000 bill.
Is that fair for an out of warranty engine with a known defect? I can argue both sides

As for Dodge pickups the model years with the 53 block is 98.5 to 2001. Here is a link for repair of a cracked 53 block:

53 block repair