We made it through the weekend in our temporary quarters at the Hotel Elegante in Albuquerque. The weekend was just a waiting period until we could see what comes next in our engine repair saga. Although the square footage of our hotel room isn’t much different than that of our coach, the layout is very different. The hotel room is made for sleeping and the small desk and storage areas are afterthoughts. The coach is much more comfortable and organized – long hot showers notwithstanding.

On Saturday afternoon, we headed over to Marble Brewing to take the 2pm tour. They were having a fundraiser for the Albuquerque Mountain Rescue Council and that packed the house. The brewery tour had to be broken up into two groups and the groups were still too large. It was interesting nonetheless. The thing I found most interesting was part of their process – they boil the wort in a 30-barrel brew kettle. This isn’t unusual – what’s different is that the wort is transferred to 150-barrel fermentation vessels. It takes five batches to fill the fermenter! It must be quite a task to keep things consistent when you have to brew five batches before you begin the fermentation.

150-barrel fermenters

We also viewed a temperature-controlled storage room filled with wooden casks where beer was being barrel-aged.

A portion of their barrel-aging storage

The bottling line

We sampled a few ounces of brew, then decided to leave the crowded brew pub and head over to Rio Bravo Brewery. They have a large brew pub and it’s really laid back. They also serve food – Marble and Tractor brewing rely on food trucks.

Donna had a quinoa and arugula salad to go with her porter while I ordered a New Mexico treat. In Michigan, you’ll find cafes that specialize in what they call Coney Dogs. These are hot dogs covered in a type of beef chili (no beans) and various other condiments. In New Mexico, they serve hot dogs with cheese and diced green chilies. It was tasty.

Green chili cheese dog

On Sunday morning, Donna wanted to get out and get some exercise in the fresh air. So she rode the Spyder to the east end of Menaul Boulevard to the Menaul Trailhead to hike. I stayed at the hotel and watched a very entertaining Moto GP race from Aragon, Spain. Valentino Rossi showed his talent as well as his toughness as he held on to second place for much of the race before fading to fifth place near the end – this was just 24 days after he broke his leg! He broke his tibia and fibula in a training accident and could barely walk a few days ago.

On Sunday evening, Donna took an Uber ride to the Old Town area to meet up with her friend Hazel. They walked from Hazel’s house to the Range Cafe restaurant where they met up with more friends. I stayed home and watched the Oakland Raiders struggle against the Washington Redskins.

On Monday morning, it was time to get back to business. I was getting ready to go over to Rocky Mountain Cummins when they phoned and told me they had the turbocharger removed and I should come and look at it. The original estimate called for a turbo replacement due to oil leaking past the seals. I didn’t believe this was the case. The oil in the intake and turbo housing was coming from the auxiliary compressor on the engine. This compressor supplies air for the suspension system and air-operated parking brake.

With the turbo removed, I could see there wasn’t anything wrong with the shaft bearings or seals, however it did have a problem. The blades on the intake compressor wheel were damaged. They had small nicks in the leading edges of the blades. This is usually the result of foreign objects ingested through the intake system. That could be really bad news as any foreign material would pass through the engine and most likely damage pistons and cylinders or at least piston rings. Close inspection revealed the nicks only to be on the leading edges – dirt or other abrasives show themselves across the blade. Also, there was oil in the turbo and no sign of dust or dirt in the oil.

In talking it over with the mechanic doing the work, Josh, we came to the conclusion that the nicks in the leading edges of the blades were likely caused by droplets of oil being struck by the spinning compressor blades. The turbine wheel on the exhaust side, the shaft and the compressor wheel and blades are constructed from lightweight materials. This allows the wheels to quickly spool up to high operating RPM – over 100,000 RPM at times. The compressor is designed to operate in a clean air environment.

The integrity of the blade material is important. Anything that weakens the structure could lead to a failure such as blade separation. That would be bad, very bad. A blade failure would send pieces of the blade through the engine with catastrophic results. I decided to have the turbocharger replaced.

Turbocharger on bench

Close-up of compressor blade damage

I saw the exhaust manifold on a cart. It wasn’t just cracked – it was completely broken into two pieces! This is likely due to the leak in the charge air cooler. A pressure leak in the CAC can lead to excessively high exhaust gas temperature. One thing leads to another.

Broken exhaust manifold

Now we’re back in a waiting pattern. The CAC and engine coolant radiator are at the radiator shop to be re-cored. I’m keeping my fingers crossed that they can repair the CAC. If all goes well there, the shop may have everything back together by Thursday – we’ll see. One good thing about being here in Albuquerque is the availability and concentration of qualified shops. There’s a lot of heavy-duty truck traffic due to I-25 and I-40 intersecting here without much else within a few hundred miles. The Albuquerque Rocky Mountain Cummins is one of 32 Cummins Coach Care Centers in the USA. They do a lot of RV work.

Tomorrow morning, Donna flies back to Albany, New York. She’s visiting her parents for a week in Bennington, Vermont. It’s pretty good timing for her – she can get out of this hotel. Meanwhile it presents a logistical dilemma for me. If the coach is ready to roll on Thursday, I need to figure out how to get all of our stuff and Ozark the cat from our hotel to the coach. I’ll come up with something and try to remain optimistic about having the work completed by then.