Anti-freeze out of Air Box Drain Can

[luvrbus]

well, were i you,
before you get to deep, pull the heads and have them inspected for cracks and warp etc. look at the valve seats.
if the head/heads are toast, look for a gooder engine... ?

If he got it hot and the liners are glazed with black streaks he will need new liner kits too,if they are good shape just hone it and buy new rings.Hillsboro Diesel in Or would have been a good choice but the owner had a stroke and they are in turmoil.
If he was in AZ I would help him out,I have one coming in from WA in Dec that has the same problem plus another 6v92 for rebuild in Oct.
Gnarly it does take a lot of special tools and regardless of what you read and see on the internet the 92 series is not as forgiving as the 71 series when it comes to a overhaul .If you can get it Az this fall I will help you lol what's 1 more.You do need a shop to work on the engine the junk yard style of working on the engine is not the best method plus it is hard on the body crawling around         

[Scott & Heather]

How is scott Crosby doing this all the time? I thought he did minor rebuild stuff on location? I thought he was self taught too? I don't have the Kahonas to ever attempt an inframe or any such repair so hats off to any of you attempting it. Cliff, you need to live forever to help out the rest of us.


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[Van]

We got those on didn't we Van

Yes that was a bare bones operation facilitated by a motel parking lot. would I do it again? probably. Now changing a Drop box on the side of a road in the summer heat, probably not so much.

[luvrbus]

Yes that was a bare bones operation facilitated by a motel parking lot. would I do it again? probably. Now changing a Drop box on the side of a road in the summer heat, probably not so much.

Lol sometime you gotta do what you gotta do but those rocks hurt  ,on the bright side a good friend came out of that deal

[windtrader]

How do I know now if it needs a rebuild?

My 2c. If you are asking this question, the first task before all others is get the problem fully diagnosed before plotting a course of action. If it turns out to be minor, your skills and tools can tackle the repair. If it is major, you'll better estimate the total costs, time, and logistics for making the repair.

One thing I can share is the PO of my bus was advised by his mechanic for some time about needing a full rebuild rather than piecemeal multiple partial repairs. The multiple shop visits and repairs kept it alive but cost quite a bit and also suffered lack of reliability. One final breakdown altered his approach and he had a reman motor ordered and installed. Not surprising but the total spend over time and reduced dependability was significantly more than doing the new motor upfront.

[Geoff]

They say it is a no-no, but just put some stop leak in the radiator for 12 gallons of mixed coolant and it should stop the leak until you can get it repaired.  I'm sure if it got hot enough to melt the O rings on the liner(s) the engine won't last much longer, even though you have lasted for 3 years since the overheat.  BTW, the engine shut-down is supposed to activate at 205F and save the engine from overheating which is in the 210f range. 

[chessie4905]

The biggest common culprit in damaging a Detroit is #1 overheating, #2 running out of oil, #3 overspeed. Although allowing inexperienced mechanics work on it.
Many times, damage from overheating may not show up right away. Maybe a couple of thousand miles later.

[GnarlyBus]

BTW, the engine shut-down is supposed to activate at 205F and save the engine from overheating which is in the 210f range.  

I remember reading that...what I'm wondering is if it gets to 205 and shuts down, does it prevent any damage? Or is that just preventing catastrophic damage? If triggering an overheat shut down grounds for a rebuild every time?

Also, what do I look for to see if it needs a rebuild before I tear it all apart?

[Geoff]

I've activated the 205f shutdown a couple of times in the last 15 years and it didn't hurt my engine at all.  You may have gotten it hotter than that due to a bad sensor.

[eagle19952]

I've activated the 205f shutdown a couple of times in the last 15 years and it didn't hurt my engine at all.  You may have gotten it hotter than that due to a bad sensor.

me too, only in Arizona, wouldn't be there without it.
Lived to tell about it.

[luvrbus]

There should be a warning light that activates at 201-202F before shutdown

[GnarlyBus]

Update: We've driven the bus a few times since the coolant start leakingand it's stopped.

The first time we started it up, it stopped leaking when the engine was running. Maybe the liners warm up, expand and seal while the engine is running?

After the first time we moved it, it started leaking about 12 hours later. It leaked 6 gallons in 2 weeks.

We refilled the coolant and drove about 20 miles. This time it didn't leak when we parked. We've driven it a few times since then and kept an eye on it and still no leaking... What could explain that?

I'm not thinking it's fixed and I'm still planning on repairing it but it has me curious.

[chessie4905]

You'll find out when you finally tear it down.

[dtcerrato]

Just for conversation sake. Years before our in frame, we had coolant get into the oil through a bad O ring on the head (found during a head replacement). At least 3 times over the coarse of twice as many years we added stop leak in the coolant & each time it remedied the problem for a couple years at a time. Not saying it's your fix but it may buy you some time not to mention the fun of experimenting.

[GnarlyBus]

At least 3 times over the coarse of twice as many years we added stop leak in the coolant & each time it remedied the problem for a couple years at a time.

What brand stop leak did you use? Thx.