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Topic: Exhaust leak 2006 Nimbus 336 ISL 400 (Read 516 times) previous topic - next topic

Exhaust leak 2006 Nimbus 336 ISL 400

My nimbus has an exaust leak at cyl 4 probably gasget. Foretravel would not work on it. Said take it to Cummins.

I was at Foretravel changing a cabinet when I discovered the leak.

Talked to MOT they said Stewart&Stevenson had worked on them in the past.

Cummins Houston is having problems and S&S is in Longview closer to foretravel. They said they would do the job.

That is where the coach is now.

I am home in Waller near Houston.

I looked at removing the the engine hatch. It extends under the bed frame looks like it needs to be dissembled to get access to the top of the engine. The bed is on a slide. Any one have experience in that situation. Looks like a tougher job than the Manafold.

Any one have experience with the engine hatch under bedroom slide.
2006 Nimbus 336
Built 2005 may be one of the first coaches labeled Nimbus.
DEMCO Air-force One braking system.
Towing 2002 Jeep Wrangler Sport.
Road Master Falcon 5250 tow bar.

Re: Exhaust leak 2006 Nimbus 336 ISL 400

Reply #1 –
The manifold is likely warped and will need to be replaced or out to the machine shop for resurfacing. I'm a pretty good size guy and if I had to I could get to everything thru the back.
Bruce, Linda, and Macy
Zoey RIP 1/20/19
1999 U295 40' build #5400
2017 silver Jeep Wrangler, 1260 watts of solar on top
Moving around the country

Re: Exhaust leak 2006 Nimbus 336 ISL 400

Reply #2 –
They have changed a few at Stewart& Stevenson. No cracked ones yet. One did not need anything except gasget. Others made the trip to the machine shop.

They can get gaskets and bolts in two days. 4 to 5 days for Manafold. Going to remove Manafold and check things out and only order Manafold if it needs replacing.

I did not want to drive it home with the leak if I did not have to or I might have done it myself. Looks like a gasget to me.

I am surprised Foretravel would not do the work. 😱
2006 Nimbus 336
Built 2005 may be one of the first coaches labeled Nimbus.
DEMCO Air-force One braking system.
Towing 2002 Jeep Wrangler Sport.
Road Master Falcon 5250 tow bar.

Re: Exhaust leak 2006 Nimbus 336 ISL 400

Reply #3 –
The Longview S&S is very familiar with Foretravels and will not be freaked by engine access issues. They fixed my retarder problem. They are much more likely to be experienced with working on your engine than Foretravel. Sometimes it's the better part of valor to say no politely than an unwise yes.
1998 36 foot U270 Build No. 5328 WTFE, 900 watts solar, Victron controller, B2B, bat monitor, 600 AMPH lithium with 2018 Chevy Colorado toad, SKP #110239, Motorcade #17781, 2021 Escape 17B for when Coach is broken down and campsites are too small, retired and full-timer since Dec. 2020. Part of RV family since 1963.

Re: Exhaust leak 2006 Nimbus 336 ISL 400

Reply #4 –
They have another foretravel on their lot. Looks like it may have been there for a while.
2006 Nimbus 336
Built 2005 may be one of the first coaches labeled Nimbus.
DEMCO Air-force One braking system.
Towing 2002 Jeep Wrangler Sport.
Road Master Falcon 5250 tow bar.

Re: Exhaust leak 2006 Nimbus 336 ISL 400

Reply #5 –
I am back home on the farm in Waller Tx with my repaired Foretravel.

Stewart and Stevenson did a great job on the repair.

They found the exhaust manafold was fine just needed new gasget and bolts. They found the parts and made the repair. I told them I thought the Cummins was under powered. They agreed and it still was.

Further examination found a split Charge Air cooler. Finding parts was difficult in today's environment.

Foretravel had one but it was very expensive. I called Foretravel and they had some. Motorcade number saved a lot of money. Foretravel is swamped and could not do the work anytime soon. I had it shipped to SS Longview and just got back to Waller.

The result was amazing. The coach climbs hills as fast as my pickup. A different Beast.

Expensive repair but worth it. Now planning a trip to Colorado for some cool weather in the mountains.

The cooler was $3200 with my motorcade discount. 🤯Almost half What was quoted to S&S.
2006 Nimbus 336
Built 2005 may be one of the first coaches labeled Nimbus.
DEMCO Air-force One braking system.
Towing 2002 Jeep Wrangler Sport.
Road Master Falcon 5250 tow bar.

Re: Exhaust leak 2006 Nimbus 336 ISL 400

Reply #6 –
Glad you are going. I had one re-cord at a rad shop for my Monaco so that is always an
option if you can't find one.
Peter and Frieda Morin
1999 36ft. U320 Foretravel
Build # 5436
1998 Suzuki Sidekick Sport

Re: Exhaust leak 2006 Nimbus 336 ISL 400

Reply #7 –
Congratulations. You've restored power to your engine, taken care of an important maintenance item, and found a competent repair shop that doesn't just throw parts at problems. You will really notice the difference in Colorado and New Mexico. We will be in New Mexico and Colorado starting in two weeks and then leaving in mid July for Oregon. Safe and joyful travels.
1998 36 foot U270 Build No. 5328 WTFE, 900 watts solar, Victron controller, B2B, bat monitor, 600 AMPH lithium with 2018 Chevy Colorado toad, SKP #110239, Motorcade #17781, 2021 Escape 17B for when Coach is broken down and campsites are too small, retired and full-timer since Dec. 2020. Part of RV family since 1963.

Re: Exhaust leak 2006 Nimbus 336 ISL 400

Reply #8 –
Quote from: Realmccoy –
We will be in New Mexico and Colorado starting in two weeks and then leaving in mid July for Oregon. Safe and joyful travels.

Have had several inquiries about travel in the Angel Fire/Eagle Nest NM areas due to fire.

Both are clear of the fire areas.

For excellent fire updates done daily in both English and Spanish: NM Fire Info | Author Archives

Hermits Peak and Calf Canyon Fires May 30, 2022, Daily Update

Then to get the next day's update, click on the author (SFNFPIO).

The fire updates also have good maps that are updated using IR imagery when conditions permit overflying.
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020