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KXLARRY · 10-13-2019, 11:10 PM

I recently launched my boat with my Coachman Cross Country MB35 with a Cummins 6cyl 300 horse diesel and had to back in a little too far due to low water level at the launch. Motorhome runs great but now when I stop an idle it vibrates. If I shift into neutral it vibrates less but still shakes. Has anyone had this issue. I assume it was from some water intrusion since all was well before that. Again the coach drives perfectly except for the vibration when stopped at idle. The only error code I see on my Scan code reader is, 1 2063 15 127. Thank you for any help on where to look.

jacwjames · 10-14-2019, 07:12 AM

How far back into the water did you go. Were you past the rear axle? If so there's a chance that water got in the transmission, on my coach there is a dip stick on the lower part of the transmission. Water could have gotten in there.

I would check the transmission fluid for any signs of water, cloudy color or foaming. Any doubt I'd dump the transmission fluid, change filters, and put in new fluid. I take a sample of the old oil and send it in for analysis. I wouldn't drive it until you get the results from the sample back. If there was water intrusion you may have to repeat oil changes multiple times.

twinboat · 10-14-2019, 09:06 AM

What your discribing is an engine cylinder not firing. Its running on 5 cylinders.

Get a mechanic to look at it. It may be a coincidence that it happened while launching a boat.

153stars · 10-14-2019, 08:01 PM

Many diesel and gas boat engines exhaust under water. I doubt \ hope you wouldn't go in far enough for your whole muffler to have been solid full of water.