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Old 05-07-2011, 01:37 PM   #1
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Join Date: May 2011
Posts: 4
Year: 1989
Coachwork: Blue Bird
Chassis: International
Engine: 9.0 liter
Rated Cap: 71
9.0 liter or 6.9 liter

So I'm having problems with my 9.0 liter engine, it may have a hole in the piston, not sure yet. But if so, I can get a decent deal on a 6.9 liter. I'm wondering who has experience with either engines. Would it be a good swap or should I just rebuild the 9.0 liter engine? Which engine is better the 9.0 or the 6.9?
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Old 05-08-2011, 06:12 PM   #2
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Join Date: Nov 2003
Location: Twin Falls, Idaho
Posts: 806
Re: 9.0 liter or 6.9 liter

Do a compression test and find the low cylinder. After the compression test, determine if engine needs a valve job. Remove the oil pan and replace the piston and rings. If all the numbers are bad, build or buy an exchange. Frank
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Old 05-09-2011, 02:32 PM   #3
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Location: Montana
Posts: 1,614
Year: 1995
Coachwork: Blue Bird
Chassis: All-American R/E
Engine: 8.3 Cummins
Rated Cap: 72
Re: 9.0 liter or 6.9 liter

9L is a great engine. Find another if you have to, dont go with the 6.9.
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Old 07-26-2012, 08:29 AM   #4
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Join Date: Mar 2011
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Year: 1987
Coachwork: Blue Bird Conventional
Chassis: International S-1753
Engine: 6.9L IDI
Rated Cap: 65
Re: 9.0 liter or 6.9 liter

lol Yes!! Rebuild that good ole' 9.0L, I wouldn't get that 6.9L unless you ran out of options. lol I have one, it has little power, and it gets horrible fuel mileage, but it's reliable. lol
"IF it ain't broke... Don't screw with it and end up breaking it!"
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