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Old 12-27-2010, 08:46 PM   #21
Bus Nut
Join Date: Aug 2010
Posts: 352
Year: 1995
Coachwork: Thomas
Chassis: International
Engine: 466DT
Rated Cap: 65
Re: Skoolie Advice

Something I just thought of and don't know why I didn't think about it before. I would really like to know if there is oil in the coolant or vice versa, coolant in the oil. Three guys at work each lost there engines in there 90 era chevy pickup trucks. One was a '92 1/2 ton, '97 1/2ton, 97 3/4ton, 350's. All three had the same thing happen. Gm put a oil cooler inside the radiator and the cooler sprung a leak causing coolant to enter the engine and destroy it (wash the oil away). I have a 97 3/4ton chevy 454 and at times worry about the samething happening. I've meant to disconnect the oil line and probably just bypass it. This won't help your cause but just something I thought I would throw out there.

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Old 12-28-2010, 06:34 AM   #22
Join Date: Aug 2009
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Year: 1963
Coachwork: Grumman
Chassis: Chevrolet
Engine: Chevy 292 I-6
Re: Skoolie Advice

I have seen fuel pumps go intermittent before failure, and also seen them recover after cooling [soon to fail permanently]. Your problem could be bad mains as well, or something else. It takes about a minute to disconnect the fuel line to the filter, turn on the key and verify flow...and costs nothing.

Rule #1 in repairing a dead engine: Verify the basics. Spark, Fuel, Air.
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Old 12-28-2010, 07:52 PM   #23
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Re: Skoolie Advice

I hate to say it. But, the 350 gassers that GM put into school buses were not the smartest idea and a lot of them ended up needing replacement. (I worked at a couple school bus companies).

Most likely the mechanic that looked at it was right. Probably a lower end knock. Obviously check the basics first and confirm it is indeed the engine thats blown.

The reason OB1 is probably saying its the fuel pump is because it might be starving for fuel and pinging (pre-ignition). Did it overheat? The engine will "ping" when its overheated also. You might be mistaking a knock for a ping. Its possible. Remember... RULE OUT THE BASICS!! Ignition, fuel, etc..

If I was in the situation.. The entire decision would be based on the extent of the conversion. Its a tough call. If you don't want to start over. I would source a rebuilt engine. Maybe look into putting the 366 gasser into it. Find some cheap labor if possible. I know its easier said than done.
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Old 12-31-2010, 09:39 AM   #24
Bus Crazy
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Location: New England
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Year: 1993
Coachwork: Ward Genesis
Chassis: International
Engine: DT466/MT643
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Re: Skoolie Advice

If going through the trouble of going from a 350 to a big-block, forget the 366...I'd go with a nice 454 swap! Should bolt in with all factory parts, because the 454 was optional on P30's (most motorhomes used 454's).

However, I have to say I would RATHER have a 350 than a 454! Built to pull and properly maintained, a 350 in a P30 will run 200,000+ miles while using considerably less gas than a 454.
Optimism is a mental disorder.
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Old 01-05-2011, 11:55 AM   #25
Join Date: Nov 2009
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Year: 1995
Coachwork: Chevy
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Rated Cap: 16
Re: Skoolie Advice

Operation rescue my bus is full go. It is getting fixed in PA & I will pick it up in a few weeks and go 50-55 on the way home. New engine, hoping the trans is fine!!!!
Rutgers tailgating bus
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Old 01-05-2011, 01:12 PM   #26
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Location: Roswell, NM
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Year: 1986
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Chassis: 40 ft All American FE
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Rated Cap: 89
Re: Skoolie Advice

So what was wrong with it or did you just have a new engine dropped into it?
This post is my opinion. It is not intended to influence anyone's judgment nor do I advocate anyone do what I propose.
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The goal of life is living in agreement with nature. Zeno (335BC-264BC)
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