Blown Engine - 40" V10 Newmar

timmac wrote:

azdryheat wrote:
Everyone is assuming the engine blew but we don't know for sure what happened. And I seriously doubt the engine was "working over time max weight every mile".

If they were towing a toad over 4000lbs and the weight of that 40ft motorhome its over its max weight for that motor as I see it, why to much of a motorhome for a gas motor, should have been a diesel.


My setup towing my stacker trailer weights 26,500lbs and in the mountains its working hard and I feel that's pretty close to max even though Ford says it can handle 30,000lbs max


Running max all the time puts to much strain on the drive train.

Just my 2 cents

If the motorhome is a little lighter (and 10-15% is a little in my opinion), the motor works just as hard while you go a bit faster up the hill. If it's a little heavier, the motor works just as hard while you go more slowly. It perhaps does spend a bit more time at high power output, and so conceivably may have a slightly reduced service life, but it emphatically should not self-destruct at 25,000 miles!

It makes no sense to blame a potential 10% at most weight over the manufacturer's GCWR as the cause of the engine's life being cut by about 90% of what is typical with proper maintenance. Either there was some significant operator error (something like continued running after a coolant leak or failure to keep oil in the crankcase), or there was some defect in the engine construction, or the owner just happened to have extraordinarily bad luck...but I very rather doubt the last one, and have no reason to suspect the first one.

The V10 does very much sound like it's going to blow itself to bits when it works hard. That doesn't mean, in general, that it's incapable of hauling around that much weight. The F750 can come with the same engine and transmission and a GVWR of up to 33,000 pounds with the proper packages.