8.2L Detroit head gasket repair - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 4 (permalink) Old 03-27-2012, 03:39 PM Thread Starter
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Question 8.2L Detroit head gasket repair

Our scout troop is looking at a replacement school bus that has an 8.2L Detroit with about 250,000 miles on it and about 15,000 on head gasket replacement. Questions.
1. Can the head gasket be replaced reliably without milling the head? One of the rebuild shops talks about high metal on the block around the head bolts.
2. How can I tell if the head gasket has blown again?
3. Is this something to worry about? We will only put about 5,000 miles a year on the bus and probably be looking for a replacement again in about 50,000 miles.
There is oil coming out of the rear (smaller) air tank on the air brakes. There is also a very small amount of oil on the outside of the pump. I didn't see any oil coming out of the large tank or the dryer. The pressure build up time is about 40 seconds (60psi to 90psi) with 120psi cutoff. Any comments?
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post #2 of 4 (permalink) Old 03-27-2012, 07:09 PM
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When you have the head off get it checked, you want to be sure the valve guides are good and they can check the beck with a straight edge, to know if it needs resurfacing.
The block you do have to file the area around the bolt holes to be sure the block is flat.
The air compressor sounds great the test is to build it up to cut out preasure, block the wheels, then release the spring brakes, and pump the brakes down to 50 lbs, then with the engine steady at 1200 RPM, it should build to 90 lbs in 2 minutes. The spec was relaxed to three minutes, for Ford, but 2 minutes is a safe spec.
Before you take it apart set the govenor gap, then it will cut down in the time it takes, when assembling.
Just a thought. If you are close I have all the tools needed, and if it is for the boy scouts, I work real cheap when it warms up.

1988 ford van fresh overhaul, 1991 nissan pick-up 1993 Caprice 2000 GMC S10 Blaser 2007 nbs 3500 GMC 4x4 crew-cab long box 17 inch single wheels Duramax Alison. BW turnover Ball. Furakawa FL35 loader. Retired, HD mechanic, worked on engines all my life. Fabricator welder. electrician. in the process of finishing my new shop. Live in Rock Creek B.C. Wife has a fruit stand.
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post #3 of 4 (permalink) Old 03-28-2012, 09:41 PM Thread Starter
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Thanks for the offer John but I live in Colorado Springs, CO USA. We are setting record high temps this week. Highs in the 70's.
We are looking to buy the bus and I was looking for an experienced 8.2 mechanic. The head gasket was replaced about 10,000 miles ago. If it was done right how long can I expect it to hold. Is there a history of repeat failures for the 8.2? I have heard some bad things about the 8.2.
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post #4 of 4 (permalink) Old 03-29-2012, 05:49 PM
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I use to do them years ago and when done right the head gasket will last for years, and at least 100,000 miles. If the gasket only lasted 10,000, then they did not check the block bolt hole bosses for flat the spec is plus. 0035, I do not like that flat is much better. I worked at a Detroit dealer when they first came out and the head gaskets were recalled, we did a lot of them, and had very few that had problems when they were taken care of.
I worked for a freight company and they had 6 of the turbo`d model, in 3.5 years they never gave needed any repairs. Just maintenance.
The cooling system must be cleaned and the aditive package up to snuff, I recommend Power-cool or Power-cool Plus.
Setting the racks properly can be a difficult, if you have not done it before.
I had a moonlighting customer that had a dozen of them, they worked great, as single axle pebble haulers, also P&D, many bus companies used them, either the naturals or the turbo-ed models.
Good luck!

1988 ford van fresh overhaul, 1991 nissan pick-up 1993 Caprice 2000 GMC S10 Blaser 2007 nbs 3500 GMC 4x4 crew-cab long box 17 inch single wheels Duramax Alison. BW turnover Ball. Furakawa FL35 loader. Retired, HD mechanic, worked on engines all my life. Fabricator welder. electrician. in the process of finishing my new shop. Live in Rock Creek B.C. Wife has a fruit stand.
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