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rough running at Altitude

My tripac with a Yanmar Diesel started running rough around 3 months ago, and I put 2 and 2 together and it's only at altitude. Does anyone know if there's a set screw or something I can adjust to control the fuel/Air mixture? or do I have to take it in to thermal king and pay an outrageous price.

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Thanks for the feedback. I've had my unit 3 yrs from new and during all the services I have had done at Thermal King not once did they ever change an inline filter or service the air filter. They always changed 1 oil filter and 1 fuel/water filter. That's it.

Looks like I'll do my own service next time. Thanks Again.

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How high of altitude?

I have a Thermo king tri pac and I run to MT and back every week.

I am wondering since you said this is a new problem that maybe it could be your filters.

There are 2 fuel filters. The inline fuel filter often gets neglected. Make sure it gets changed at lest every other service. Also make sure your servicing your air filter regularly. I actually have a Fleet air filter for mine which is nice because I just wash it and go. It also flows more air.

One thing that might have to be changed is your RPM, Thermo king will have to do that.

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They make a FleetAir filter for the TriPac? I'll have to look into that. I just recently put one in the big motor and absolutely love it. Truck is performing much better and is definitely getting an increase. In the 23 days since I've put it on I've gained .6 mpg versus the 23 days before hand and that's pretty much all that's changed with the truck save a minor exhaust leak fixed within the last week.

My buddy had to have his idle set higher on his because it was running rougher and building up a bunch of carbon in the exhaust pipe, the TK he was at said it was because the idle speed on it was set too low. I'm going to have mine looked at next time I'm in.

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They injectors will need re-calibrated. All naturally aspirated engines have this problem.

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I concur with Jackie. I've had my Tripak for 4.5 years, running a lot of 4000'+. Rotella T-6 would be a good idea too. Many shops will service your Tripak, but they really don't have a clue what they're doing. If you don't have a shop you trust, stick to ThermoKing. Pennywise & pound foolish?

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I was told by the TK in De Pere, WI that there is supposed to be an "Annual" service that gets done on the unit once a year (my buddy was told to get it done twice a year) where they check the entire unit over real well.

They change every filter on the unit, check the lines, etc. The TK in Knoxville told me that I should change the in-line filter every 2000 hours and obviously with the air filter just keep an eye on it. The bunk heater is also supposed to be serviced every so often, they take it apart and clean up the parts and make sure they don't need replaced. The units are supposed to be serviced every 1000 hours.

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gtttransport will be eternally grateful.
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